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00M-670 IBM SVP Primary Support Provider Mastery Test v1

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00M-670 exam Dumps Source : IBM SVP Primary Support Provider Mastery Test v1

Test Code : 00M-670
Test Name : IBM SVP Primary Support Provider Mastery Test v1
Vendor Name : IBM
Q&A : 25 Real Questions

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IBM IBM SVP Primary Support

IBM’s ‘huge wager’ on Kubernetes is unifying cloud providers across systems | killexams.com Real Questions and Pass4sure dumps

Navigating cloud computing services will also be problematic, especially when they come from diverse suppliers. therefore, establishing a great groundwork turns into much more crucial in retaining a hit operations across nowadays’s multicloud landscape. For IBM, that basis is Kubernetes, the open-supply device for managing containerized utility applications at scale.

“IBM has taken a big bet on Kubernetes two and a half years ago,” spoke of Daniel Berg (pictured), uncommon engineer, IBM Cloud Kubernetes service, at IBM. “[We] not ever truly appeared again; it’s our basic foundation for our platform features.”

Berg spoke with Dave Vellante (@dvellante) and Stu Miniman (@stu), co-hosts of theCUBE, SiliconANGLE Media’s mobile livestreaming studio, during the IBM suppose experience in San Francisco. They mentioned IBM’s Kubernetes functions and the company challenges of relocating operations between inner most and public clouds. (* Disclosure beneath.)

Bridging the multicloud gap

The IBM Cloud Kubernetes service presently has two distributions: IBM Cloud inner most, or ICP, which operates on-premises, and a managed service in the public cloud. So, what are the merits of completely retaining a personal cloud with Kubernetes? The container administration platform modernizes and organizes years-old content.

“We’ve modernized it, put it in containers, set up it, and control it on Kubernetes. The first-class issue is that content which you can convey on-premises where it’s essential the most and run it in ICP — and also take that and run it in our public cloud,” Berg explained.

Kubernetes is convenient to deploy, installation, and get started. despite the fact, it is not devoid of its complications. With enhanced proliferation comes more desirable problem in managing the diverse clusters, Berg pointed out. “There are nevertheless some complexities, as a result of … you’ve obtained building clusters; you’ve obtained test clusters,” he said.

To alleviate the challenge, IBM launched a new product referred to as Multicloud manager, which gives a manage airplane to manage components throughout many different clouds and disparate platforms. it really works with ICP and IBM Kubernetes service however is additionally suitable with Amazon, Google, Azure and OpenShift. Multicloud manager also helps with safety compliance and enforcement, so it gives safety anyplace it's lacking.

For businesses finding it under feasible to hold consistency and necessities while customizing for certain data wants, Berg stated the benefits of numerous distributions. “in order for you whatever thing that’s tremendously, enormously specific to a given use case or you have transformations to your infrastructure that you should have extra flexibility, that’s the place IBM Cloud inner most comes in,” he noted.

Two clouds are greater than one

relocating to public cloud in a single fell swoop is a Herculean project, even for big corporations such as Amazon and Google. this is where hybrid cloud is available in. In IBM’s case, it combines ICP and OpenShift to provide OpenShift clients IBM’s content material, built-in monitoring, and integrated logging onto the platform for which they are already standardized.

“as a result of we constructed and are standardized on Kubernetes, we supply Kubernetes carrier and we do that at scale and relaxed, in addition to extremely accessible,” Berg cited.

Berg did warn towards using just one cloud vendor, and he also advised groups to be constant in what they desire out of their suppliers. “but the aspect that clients do deserve to examine, and what they do should standardize throughout an business, is a few of the core tenets and core applied sciences,” he introduced.

Visibility into workloads is also vital to a corporation’s operations, Berg explained. And IBM Cloud Monitoring does this. The tool isn't wonderful to Kubernetes, both. fairly, it can be extended into digital machines and different forms of workloads. IBM’s monitoring is greatly helped by means of its partnership with Sysdig Inc., Berg introduced.

“you can’t build a cloud-native solution without monitoring, correct? Monitoring and log … it’s like peanut butter and jelly. You’ve got to have them,” Berg concluded.

Watch the comprehensive video interview beneath, and be sure to check out more of SiliconANGLE’s and theCUBE’s coverage of the IBM think event. (* Disclosure: IBM subsidized this section of theCUBE. Neither IBM nor different sponsors have editorial manage over content on theCUBE or SiliconANGLE.)

photograph: SiliconANGLE on the grounds that you’re right here …

… We’d want to inform you about our mission and how that you can assist us fulfill it. SiliconANGLE Media Inc.’s enterprise mannequin is in response to the intrinsic value of the content, now not advertising. not like many online publications, we don’t have a paywall or run banner advertising, because we want to hold our journalism open, with out have an effect on or the need to chase site visitors.The journalism, reporting and commentary on SiliconANGLE — together with are living, unscripted video from our Silicon Valley studio and globe-trotting video teams at theCUBE — take a lot of hard work, time and money. retaining the satisfactory excessive requires the help of sponsors who're aligned with our vision of ad-free journalism content.

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Skytap declares Upcoming accepted Availability of First Self-carrier, Public Cloud Capabilities for IBM i | killexams.com Real Questions and Pass4sure dumps

No effect found, are trying new key phrase!SEATTLE, Feb. 11, 2019 /PRNewswire/ -- forward of IBM suppose, Skytap, a world, intention-constructed public cloud company, today announced that its assist for the IBM i operating ... remedy," spoke of Karri Alexio...

IBM: A Future Blockchain chief? | killexams.com Real Questions and Pass4sure dumps

No outcomes found, try new keyword!(supply: IBM website) at present, IBM reports it has three basic desires in its blockchain method ... furthermore, IBM’s specialists within the box present further guide for those drawn to the technol...

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IBM SVP Primary Support Provider Mastery Test v1

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Java Cryptography | Part 3 | killexams.com real questions and Pass4sure dumps

After you have secured your private electronic information using encryption and learned how to encrypt and digitally sign files for others, how do you extract the information and determine who encrypted the file? Asymmetric public/private key encryption allows you to decipher the information and verify the accompanying digital signature if it exists.

This article illustrates how to decrypt and verify the digital signature on files encrypted using a hybrid combination of asymmetric public/private key encryption and symmetric encryption. A symmetric key is used to encrypt the file and the asymmetric public key encrypts the symmetric key. The asymmetric private key decrypts the symmetric key which in turn is used to decrypt the encrypted file.

Figure1: Asymmetric Key Encryption Functions

The same pair of keys can be used with digital signatures. The private key is used to sign a file and generate a digital signature. The public key is used to verify the authenticity of the signature.

Figure 2: Asymmetric Key Signature Functions

The decryption technique requires the Java libraries developed by the Legion of the Bouncy Castle (www.bouncycastle.org). The Bouncy Castle jars, bcprov-jdk15on-147.jar and bcpkix-jdk15on-147.jar, contains all the methods required to encrypt, decrypt, sign and verify a digital signature. The following Java code snippet loads the BouncyCastle provider, which implements the Java Cryptography Security services such as algorithms and key generation.

import org.bouncycastle.jce.provider.*;java.security.Security.addProvider(new BouncyCastleProvider());

Decryption for Files or Java ObjectsOnce a file has been encrypted and/or signed using the DocuArmor application, it can be deciphered by the owner of the matching asymmetric private key. The process involves reading the header, extracting the symmetric key and deciphering the appended encrypted data. The following steps along with the Java code snippets illustrate the process used to decrypt an encrypted file.

Step 1: Assume you want to decrypt the encrypted file, C:\sampleFile.txt.jxdoe_nnnn.asg and the String variable, tUniqueAlias = "jxdoe_nnnn", holds the alias associated to the encrypted file. Read the header from the encrypted file and determine decrypted output name.

File tSrcFile = new File("C:\\sampleFile.txt." + tUniqueAlias + ".aes");String tDecryptFile = tSrcFile.getName();tDecryptFile = tDecryptFile.substring(0, tDecryptFile.lastIndexOf('.'));tDecryptFile = tDecryptFile.substring(0, tDecryptFile.lastIndexOf('.'));OutputStream tFileOStream = new FileOutputStream(tDecryptFile);DataInputStream tDInStream =new DataInputStream(new FileInputStream(tSrcFile));Object tRC = CryptoHeader.readHeader(tDInStream);CryptoHeader tHead = (CryptoHeader)tRC;

Step 2: The private key is stored in a Java key store and is password protected. Load the key store using your password. Retrieve the asymmetric private key from the key store using the same password. The asymmetric private key will be used to decrypt the symmetric key.

FileInputStream tFIStream = new FileInputStream("C:\\jxdoe_nnnn.jks");KeyStore tMyKStore = KeyStore.getInstance("JKS", "SUN");char[] tPW = "password".toCharArray();tMyKStore.load(tFIStream, tPW);PrivateKey tPrivKey = (PrivateKey)tMyKStore.getKey("jxdoe_nnnn", tPW);

Figure 3: Private Key

Step 3: Generate a Java Cipher object using the asymmetric private key and set its mode to "Cipher.UNWRAP_MODE".

Cipher tCipherRSA = Cipher.getInstance("RSA", "BC");tCipherRSA.init(Cipher.UNWRAP_MODE, (PrivateKey)tPrivKey);

Step 4: Use the Java Cipher and asymmetric private key to unwrap the symmetric key. It's located in the header at the instance variable, wrappedSymKey or wrappedSymKeyOther, along with symmetric algorithm at symKeyAlgDesc. The symmetric key will be used to decrypt the file.

String tAlg = tHead.symKeyAlgDesc();Key tSymmetricKey =tCipherRSA.unwrap(tHead.wrappedSymKey(),tAlg, Cipher.SECRET_KEY);

Figure 4: Unwrap Symmetric Key

Step 5: Re-initialize the same Cipher to Cipher.DECRYPT_MODE. Use the Cipher and the asymmetric private key to decrypt the initialization vector stored within the header at the instance variable initVector or initVectorOther.

tCipher.init(Cipher.DECRYPT_MODE, (PrivateKey)tPrivKey);byte[] tInitVector = tCipher.doFinal(tHead.initVector());IvParameterSpec tIvParmSpec = new IvParameterSpec(tInitVector);

Figure 5: Unwrap Initialization Vector

Step 6: Generate a Java Cipher object using the symmetric key and initialization vector and set its mode to "Cipher.DECRYPT_MODE". The string representing the symmetric algorithm, mode and padding can be extracted from the Cryptography header using the "transformation" method.

tCipherDecrypt = Cipher.getInstance("AES/CTR/PKCS7Padding", "BC");or tCipherDecrypt = Cipher.getInstance(tHead.transformation(), "BC");tCipherDecrypt.init(Cipher.DECRYPT_MODE, tSymmetricKey, tIvParmSpec);

Step 7: Use the Java Cipher to decrypt the rest of the file to a Java FileOutputStream. The DataInputStream points to the start of the encrypted data after reading the header. The end result is a decrypted file.

byte[] tInBuffer = new byte[4096];byte[] tOutBuffer = new byte[4096];int tNumOfBytesRead = tDInStream.read(tInBuffer);while (tNumOfBytesRead == tInBuffer.length) {//-Encrypt the input buffer data and store in the output bufferint tNumOfBytesUpdated =tCipherDecrypt.update(tInBuffer, 0, tInBuffer.length, tOutBuffer);tFileOStream.write(tOutBuffer, 0, tNumOfBytesUpdated);tNumOfBytesRead = tDInStream.read(tInBuffer);}//-Process the remaining bytes in the input file.if (tNumOfBytesRead > 0) {tOutBuffer = tCipherDecrypt.doFinal(tInBuffer, 0, tNumOfBytesRead);} else {tOutBuffer = tCipherDecrypt.doFinal();}tFileOStream.write(tOutBuffer, 0, tOutBuffer.length);tFileOStream.close();

Figure 6: Decipher the Encrypted File

Step 7a: If the encrypted file contains a Java object, use the Java Cipher to decrypt the rest of the file to a Java ByteArrayOutputStream instead of a FileOutputStream. The end result can be converted to an instance of its original Java class.

ByteArrayInputStream tBAIS = new ByteArrayInputStream(tBAOS.toByteArray());  ObjectInput tOIS = new ObjectInputStream(tBAIS);Object tObject = tOIS.readObject();  //-Original Java objecttBAOS.close();tBAIS.close();tOIS.close();

Alternatively, the same technique can be used to decrypt the encrypted file using the symmetric key that was wrapped with the CA or owner's asymmetric public key. If the file was encrypted for another user, the owner can decrypt it using the additionally wrapped symmetric key. If the file was encrypted for oneself, the CA can decrypt it using the additionally wrapped symmetric key in the enterprise version.

Signature VerificationWhen a file has been digitally signed with a user's asymmetric private key, the signature is stored in the Cryptography header. The signature can be validated with the user's matching asymmetric public key stored in a certificate. The process involves reading the header, extracting the digital signature and validating it against the rest of the signed file and the asymmetric public key. The following steps describe the process used to verify a digital signature.

Step 1: Assume you want to verify the signature on the encrypted and digitally signed file, "C:\sampleFile.txt.jxdoe_nnnn.asg" and the String variable, tUniqueAlias = "jxdoe_nnnn", holds the alias associated to the file. Read the header from the signed file. After the header is read, keep in mind that the DataInputStream now points to the beginning of the encrypted data.

File tSrcFile = new File("C:\\sampleFile.txt." + tUniqueAlias + ".asg");DataInputStream tDInStream =new DataInputStream(new FileInputStream(tSrcFile));Object tRC = CryptoHeader.readHeader(tDInStream);CryptoHeader tHead = (CryptoHeader)tRC;byte[] tCurrSignature = tHead.signature();

Step 2: Retrieve the certificate whose name is stored in the header and contains the asymmetric public key needed for verification. Retrieve the asymmetric public key from the certificate associated with the digital signature.

String tCertName = "C:\\" + tHead.verifySigCertName();InputStream tInStream = new FileInputStream(tCertName);CertificateFactory tFactory = CertificateFactory.getInstance("X.509","BC");X509Certificate tCert =(X509Certificate)tFactory.generateCertificate(tInStream);tInStream.close();PublicKey tPubKey = tCert.getPublicKey();

Figure 7: Extract Public Key

Step 3: Instantiate a Java signature engine and initialize it with the signature algorithm stored in the header and the asymmetric public key. The default value is "SHA512WithRSAEncryption".

Signature tSgnVerifyEngine = null;String tSigAlg = tHead.signatureAlgDesc();tSgnVerifyEngine = Signature.getInstance(tSigAlg,"BC");tSgnVerifyEngine.initVerify(tPubKey);

Step 4: Use the Java signature engine to process the rest of the signed file and calculate a hash number that will be compared with the signature stored in the header.

int tBlockSize = 4096;byte[] tBuffer = new byte[tBlockSize];int tLength = tDInStream.read(tBuffer);while (tLength == tBlockSize) {tSgnVerifyEngine.update(tBuffer, 0, tBlockSize);tLength = tDInStream.read(tBuffer);} if (tLength > 0) {tSgnVerifyEngine.update(tBuffer, 0, tLength);}

Step 5: After the file has been processed, use the Java signature engine to verify its result with the digital signature. A Boolean result is returned on whether the signature was valid.

Boolean tResult = tSgnVerifyEngine.verify(tCurrSignature);

SummaryThe article demonstrates how to decrypt and verify the digit signature of and encrypted file using Java Cryptography methods and the Cryptography libraries from Bouncy Castle organization. Using the information provided within the Cryptography header, the user can validate who encrypted its contents and/or decipher the encrypted file. The header also provides the flexibility to expand the usage of Cryptography such as allowing multiple recipients to decrypt a file by using each of their public keys to encrypt the same symmetric key. As society adopts file encryption as a standard way of protection, more creative uses will be invented by future Cyber warriors.

The source code (LaCryptoJarSample.java) is available on the Logical Answers Inc. website under the education web page as an individual file and also within the zip file, laCrypto-4.2.0.zipx.

References and Other Technical NotesSoftware requirements:

  • Computer running Windows XP or higher...
  • Java Runtime (JRE V1.7 or higher)
  • Recommended reading:

  • "Beginning Cryptography with Java" by David Hook.
  • "The Code Book" by Simon Singh

  • Avoid Bothersome Garbage Collection Pauses | killexams.com real questions and Pass4sure dumps

    Many engineers complain that the non-deterministic behavior of the garbage collector prevents them from utilizing the Java environment for mission-critical applications, especially distributed message-driven displays (GUIs) where user responsiveness is critical. We agree that garbage collection does occur at the worst times: for example, when a user clicks a mouse or a new message enters the system requiring immediate processing. These events must be handled without the delay of in-progress garbage collection. How do we prevent these garbage collection pauses that interfere with the responsiveness of an application ("bothersome pauses")?

    We have discovered a very effective technique to prevent bothersome garbage collection pauses and build responsive Java applications. This technique or pattern is especially effective for a distributive message-driven display system with soft real-time constraints. This article details this pattern in three simple steps and provides evidence of the effectiveness of the technique.

    Pattern to Control Garbage Collection PausesThe Java environment provides so many benefits to the software community - platform independence, industry momentum, a plethora of resources (online tutorials, code, interest groups, etc.), object-oriented utilities and interfaces (collections, network I/O, Swing display, etc.) that can be plugged in and out - that once you have experienced working with Java it's hard to go back to traditional languages. Unfortunately, in some mission-critical applications, like message-driven GUIs that must be very responsive to user events, the requirements force you to take that step backward. There's no room for multiple second garbage collection pauses. (The garbage collector collects all the "unreachable" references in an application so the space consumed by them can be reused. It's a low-priority thread that usually only takes priority over other threads when the VM is running out of memory.) Do we really have to lose all the benefits of Java? First, let's consider the requirements.

    A system engineer should consider imposing requirements for garbage collection like the following list taken from a telecom industry example (see References).1.  GC sequential overhead on a system may not be more than 10% to ensure scalability and optimal use of system resources for maximum throughput.2.  Any single GC pause during the entire application run may be no more than 200ms to meet the latency requirements as set by the protocol between the client and the server, and to ensure good response times by the server.

    Armed with these requirements, the system engineer has defined the worst-case behavior in a manner that can be tested.

    The next question is: How do we meet these requirements? Alka Gupta and Michael Doyle make excellent suggestions in their article (see References). Their approach is to tune the parameters on the Java Virtual Machine (JVM). We take a slightly different approach that leaves the use of parameter definitions as defined by the JVM to be used as a final tuning technique.

    Why not tell the garbage collector what and when to collect?

    In other words, control garbage collection via the software architecture. Make the job of the garbage collector easy! This technique can be described as a multiple step pattern. The first step of the pattern is described below as "Nullify Objects." The second step involves forcing garbage collection to occur as delineated in "Forcing Garbage Collection." The final step involves either placing persistent data out of the reach of the collector or into a data pool so that an application will continue to perform well in the long run.

    Step 1: Nullify ObjectsMemory leaks strike fear into the hearts of programmers! Not only do they degrade performance, they eventually terminate the application. Yet memory leaks prove very subtle and difficult to debug. The JVM performs garbage collection in the background, freeing the coder from such details, but traps still exist. The biggest danger is placing an object into a collection and forgetting to remove it. The memory used by that object will never be reclaimed.

    A programmer can prevent this type of memory leak by setting the object reference and all underlying object references ("deep" objects) to null when the object is no longer needed. Setting an object reference to "null" tells the garbage collector that at least this one reference to the object is no longer needed. Once all references to an object are cleared, the garbage collector is free to reclaim that space. Giving the collector such "hints" makes its job easier and faster. Moreover, a smaller memory footprint also makes an application run faster.

    Knowing when to set an object reference to null requires a complete understanding of the problem space. For instance, if the remote receiver allocates the memory space for a message, the rest of the application must know when to release the space back for reuse. Study the domain. Once an object or "subobject" is no longer needed, tell the garbage collector.

    Thus, the first step of the pattern is to set objects to null once you're sure they're no longer needed. We call this step "nullify" and include it in the definition of the classes of frequently used objects.

    The following code snippet shows a method that "nullifies" a track object. The class members that consist of primitives only (contain no additional class objects) are set to null directly, as in lines 3-5. The class members that contain class objects provide their own nullify method as in line 9.

    1 public void nullify () {23 this.threatId = null ;4 this.elPosition = null ;5 this.kinematics = null ;67 if (this.iff != null)8 {9 this.iff.nullify();10 this.iff = null ;11 }12 }

    The track nullify is called from the thread that has completed processing the message. In other words, once the message has been stored or processed, that thread tells the JVM it no longer needs that object. Also, if the object was placed in some Collection (like an ArrayList), it's removed from the Collection and set to null.

    By setting objects to null in this manner, the garbage collector and thus the JVM can run more efficiently. Train yourself to program with "nullify" methods and their invocation in mind.

    Step 2: "Force" Garbage CollectionThe second step of the pattern is to control when garbage collection occurs. The garbage collector, GC, runs as Java priority 1 (the lowest priority). The virtual machine, VM, runs at Java priority 10 (the highest priority). Most books recommend against the usage of Java priority 1 and 10 for assigning priorities to Java applications. In most cases, the GC runs during idle times, generally when the VM is waiting for user input or when the VM has run out of memory. In the latter case, the GC interrupts high-priority processing in the application.

    Some programmers like to use the "-Xincgc" directive on the Java command line. This tells the JVM to perform garbage collection in increments when it desires. Again, the timing of the garbage collection may be inopportune. Instead, we suggest that the garbage collector perform a full garbage collection as soon as it can in either or both of two ways:1.  Request garbage collection to happen as soon as possible: This method proves useful when the programmer knows he or she has a "break" to garbage collect. For example, after a large image is loaded into memory and scaled, the memory footprint is large. Forcing a garbage collection to occur at that point is wise. Another good area may be after a large message has been processed in the application and is no longer needed.2.  Schedule garbage collection to occur at a fixed rate: This method is optimal when the programmer does not have a specific moment when he knows his application can stop shortly and garbage collect. Normally, most applications are written in this manner.

    Listing 1 introduces a class named "BetterControlOfGC". It's a utility class that provides the methods described earlier. There are two public methods: "suggestGCNow()" and "scheduleRegularGC(milliseconds)" that respectively correspond to the steps described earlier. Line 7 suggests to the VM to garbage collect the unreachable objects as soon as possible. The documentation makes it clear that the garbage collection may not occur instantaneously, but experience has shown that it will be performed as soon as the VM is able to accomplish the task. Invoking the method on line 25 causes garbage collection to occur at a fixed rate as determined by the parameter to the method.

    In scheduling the GC to occur at a fixed rate, a garbage collection stimulator task, GCStimulatorTask, is utilized. The code extends the "java.util.timer" thread in line 10. No new thread is created; the processing runs on the single timer thread available beginning with the Java 1.3 environment. Similarly, to keep the processing lean, the GC stimulator follows the Singleton pattern as shown by lines 18-23 and line 27. There can be only one stimulator per application, where an application is any code running on an instance of the JVM.

    We suggest that you set the interval at which the garbage collector runs from a Java property file. Thus you can tune the application without having to recompile the code. Write some simple code to read a property file that's either a parameter on the command line or a resource bundle in the class path. Place the command parameter "-verbose:gc" on your executable command line and measure the time it takes to garbage collect. Tune this number until you achieve the results you want. If the budget allows, experiment with other virtual machines and/or hardware.

    Step 3: Store Persistent Objects into Persistent Data Areas or Store Long-Lived Objects in PoolsUsing persistent data areas is purely optional. It supports the underlying premise of this article. In order to bind the disruption of the garbage collector in your application, make its job easy. If you know that an object or collection of objects would live for the duration of your application, let the collector know. It would be nice if the Java environment provided some sort of flag that could be placed on objects upon their creation to tell the garbage collector "-keep out". However, there is currently no such means. (The Real-Time Specification for Java describes an area of memory called "Immortal Memory" where objects live for the duration of the application and garbage collection should not run.) You may try using a database; however, this may slow down your application even more. Another solution currently under the Java Community Process is JSR 107. JCache provides a standard set of APIs and semantics that allow a programmer to cache frequently used data objects for the local JVM or across JVMs. This API is still under review and may not be available yet. However, we believe it holds much promise for the Java developer community. Keep this avenue open and in mind for future architectures. What can we do now?

    The pooling of objects is not new to real-time programmers. The concept is to create all your expected data objects before you begin processing, then all your data can be placed into structures without the expense of instance creation during processing time. This has the advantage of keeping your memory footprint stable. It has the disadvantage of requiring a "deep copy" method to be written to store the data into the pool. (If you simply set an object to another, you're changing the object reference and not reusing the same space.) The nanosecond expense of the deep copy is far less than that of the object instance creation.

    If the data pooling technique is combined with the proper use of the "nullify" technique, garbage collection becomes optimized. The reasons are fairly straightforward:1.  Since the object is set to null immediately after the deep copy, it lives only in the young generation portion of the memory. It does not progress into the older generations of memory and thus takes less of the garbage collector's cycle time.2.  Since the object is nullified immediately and no other reference to it exists in some other collection object in the application, the job of the garbage collector is easier. In other words, the garbage collector does not have to keep track of an object that exists in a collection.

    When using data pools, it's wise to use the parameters "-XX:+UseConcMarkSweepGC -XX:MaxTenuringThreshold=0 -XX:SurvivorRatio=128" on the command line. These tell the JVM to move objects on the first sweep from the new generation to the old. It commands the JVM to use the concurrent mark sweep algorithm on the old generation that proves more efficient since it works "concurrently" for a multi-processor platform. For single processor machines, try the "-Xincgc" option. We've seen those long garbage collector pauses, which occur after hours of execution, disappear using this technique and these parameters. Performing well in the long run is the true benefit of this last step.

    Performance ResultsTypically, most engineers want proof before changing their approach to designing and coding. Why not? Since we're now suggesting that even Java programmers should be concerned about resource allocation, it better be worth it! Once upon a time, assembly language and C programmers spent time tweaking memory and register usage to improve performance. This step was necessary. Now, as higher-level object-oriented programmers we may disdain this thought. This pattern has dared to imply that such considerations, although not as low level as registers and memory addresses (instead at the object level), are still necessary for high-performance coding. Can it be true?

    The underlying premise is that if you know how your engine works, you can drive it better to obtain optimal performance and endurance. This is as true for my 1985 300TD (Mercedes, five cylinder, turbo diesel station wagon) with 265,000 miles as for my Java code running on a HotSpot VM. For instance, knowing that a diesel's optimal performance is when the engine is warm since it relies on compression for power, I let my car warm up before I "push it." Similarly, I don't overload the vehicle with the tons of stuff I could place in the tailgate. HotSpot fits the analogy. Performance improves after the VM "warms up" and compiles the HotSpot code into the native language. I also keep my memory footprint lean and light. The comparison breaks down after awhile, but the basic truth does not change. You can use a system the best when you understand how it works.

    Our challenge to you is to take statistics before and after implementing this pattern on just a small portion of your code. Please recognize that the gain will be best exemplified when your application is scaled upward. In other words, the heavier the load on the system, the better the results.

    The following statistics were taken after the pattern was applied. They are charted as:1.  Limited nullify method invocation is used where only the incoming messages are not "nullified." (The remainder of the application from which the statistics were taken was left intact with a very lean memory usage.) There is no forced garbage collection.2.  Nullify method invocation and forced garbage collection is utilized.

    The test environment is a Microsoft Windows 2000 X86 Family 15 Model 2 Stepping 4 Genuine Intel ~1794MHz laptop running the BEA WebLogic Server 7.0 with Service Pack 7.1 with a physical memory size of 523,704KB. The Java Message Server (JMS server), a track generator, and a tactical display are all running on the same laptop over the local developer network (MAGIC). The server makes no optimizations, even though each application resides locally. The JVMs are treated as if they were distributed across the network. They're running on the J2SE 1.4.1 release.

    The test target application is a Java Swing Tactical Display with full panning, zooming, and track-hooking capabilities. It receives bundles of tracks via the Java Message Service that are displayed at their proper location on the given image. Each track is approximately 88 bytes and the overall container size is about 70 bytes. This byte measurement does not include all the additional class information that's also sent during serialization. The container is the message that holds an array of tracks that contains information such as time and number of tracks. For our tests, the tracks are sent at a 1Hz rate. Twenty sets of data are captured.

    To illustrate the test environment, a screen capture of a 5,000 track load (4,999 tracks plus the ship) is shown in Figure 1. The background shows tracks rendered with the Military Standard 2525B symbology over an image of the Middle East. The small window titled "Track Generator Desktop" is a minimized window showing the parameters of the test set through the track generator application. Notice that 45 messages had been sent at the time of the screen capture. Directly beneath this window sits the Windows Task Manager. Note that the CPU utilization is at 83%. At first this doesn't seem that bad. But at that rate, there isn't much room for the user to begin zooming, panning, hooking tracks, and so on. The final command window to the right is that of the tactical display application. The parameter "-verbose:gc" is placed on the Java command line (java -verbose:gc myMainApplication.class). The VM is performing the listed garbage collection at its own rate, not by command of the application.

    The final test of 10,000 tracks performed extremely poorly. The system does not scale; the CPU is pegged. At this point most engineers may jeer at Java again. Let's take another look after implementing the pattern.

    After implementation, where the nullify methods are invoked properly and garbage collection is requested at a periodic interval (2Hz), dramatic improvements are realized. The last test of 10,000 tracks proves that the processor still has plenty of room to do more work. In other words, the pattern scales very well.

    Performance SummaryThe pattern to help control garbage collection pauses most definitely improves the overall performance of the application. Notice how well the pattern scales under the heavier track loads in the performance bar chart in Figure 2. The darker middle bar shows the processor utilization at each level of the message (track) load. As the message traffic increases, the processor utilization grows more slowly than without the pattern. The last light-colored bar shows the improved performance. The main strength of the pattern is how well it scales under heavy message loads.

    There is another subtle strength to the pattern. This one is difficult to measure since it requires very long-lived tests. If Step 3 is faithfully followed, those horribly long garbage collection pauses that occur after hours of running disappear. This is a key benefit to the pattern since most of our applications are designed to run "forever."

    We're confident that many other Java applications would benefit from implementing this very simple pattern.

    The steps to control garbage collection pauses are:1.  Set all objects that are no longer in use to null and make sure they're not left within some collection. "Nullify" objects.2.  Force garbage collection to occur both:

  • After some major memory-intense operation (e.g., scaling an image)
  • At a periodic rate that provides the best performance for your application3.  Save long-lived data in a persistent data area if feasible or in a pool of data and use the appropriate garbage collector algorithm.

    By following these three simple steps, you'll avoid those bothersome garbage collection pauses and enjoy all the benefits of the Java environment. It's time the Java environment was fully utilized in mission-critical display systems.

    References

  • Gupta, A., and Doyle, M. "Turbo-Charging the Java HotSpot Virtual Machine, v1.4.x to Improve the Performance and Scalability of Application Servers": http://developer.java.sun.com/developer/ technicalArticles/Programming/turbo/
  • JSR 1, Real-Time Specification for Java: http://jcp.org/en/jsr/detail?id=1
  • Java HotSpot VM options: http://java.sun.com/docs/hotspot/VMOptions.html
  • Java Specification Request for JCache: http://jcp.org/en/jsr/detail?id=107

  • Silverlight v1.0 Beta vs. Silverlight 1.1 Alpha - Huh?? | killexams.com real questions and Pass4sure dumps

    By Kevin Hoffman

    Article Rating:

    May 2, 2007 11:15 AM EDT

    Reads:

    20,088 Kevin Hoffman's Blog

    The short of the story is that Silverlight 1.0 applications don't support code-behind, they don't support making plain XML calls back to a web service (despite some other people's claims to the contrary, 1.0 will not let you do this!), and there is no real two-way binding (though you can set values of controls in response to events, which is what I call "old school" binding).

    Silverlight 1.1, however.. now this whole project is actually starting to show some promise. For starters, Silverlight 1.1:

  • Supports communication via XML over HTTP, which makes it ideal for "RESTy POX". Note that the 1.1 alpha version doesn't allow cross-domain access, so you'll still have to drop in server-side service proxies for accessing remote services (which is actually more secure anyway....)
  • You can write "code behind" your Silverlight apps in C# or VB.NET
  • You can write your Silverlight apps using the Dynamic Language Runtime, which means you get to use VB9 or IronPython.
  • Still has all the rich media/video support that Silverlight 1.0 has
  • Create a "Silverlight" project from Visual Studio "Orcas" Beta 1.
  • I'm going to be looking into this further and will be posting my thoughts on it, but now that we can finally play with a "real" version of Silverlight, we can hopefully stop the insanity that was the 1.0 version.

    tags: silverlight  beta  alphalinks: digg this  del.icio.us  technorati  reddit

    Kevin Hoffman, editor-in-chief of SYS-CON's iPhone Developer's Journal, has been programming since he was 10 and has written everything from DOS shareware to n-tier, enterprise web applications in VB, C++, Delphi, and C. Hoffman is coauthor of Professional .NET Framework (Wrox Press) and co-author with Robert Foster of Microsoft SharePoint 2007 Development Unleashed. He authors The .NET Addict's Blog at .NET Developer's Journal.

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    References :


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    Blogspot : http://killexams-braindumps.blogspot.com/2018/01/ibm-00m-670-dumps-and-practice-tests.html
    Wordpress : https://wp.me/p7SJ6L-2IQ
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