Enterprise Library Test Guide - Willy .Net

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Testing for Performance and Scalability 221 Area Performance counter name Threshold Process (w3wp) Private Bytes This value should remain stable during stress tests. Small amounts of memory, less than 50 MB to 60 MB, are reserved for the Caching Application Block when the test adds many items to the cache. In the Caching Application Block, the number of private bytes can add up to almost all the available memory if items are added to the cache and there is no expiration policy and no scavenging. If there is a memory leak, this performance counter increases. Process (w3wp) Virtual Bytes The number of virtual bytes should not exceed the number of private bytes by more than 800 MB. The difference between the number of virtual bytes and private bytes is because it is possible to commit more memory than the process actually owns. Virtual bytes represent virtual address space. When the number of virtual bytes is close to the 2 GB limit, memory fragmentation causes the system to slow down. Eventually, an OutofMemoryException exception occurs. continued
222 Enterprise Library Test Guide Area Performance counter name Threshold Process (w3wp) Thread Count This value should remain stable during stress tests. The thread count of a worker process should be no more than 75 + ((maxWorkerThreads + maxIoThreads) * # of CPUs), where # of CPUs is the value in the Machine.config file. The Caching Application Block uses its own background scheduler for expiration and scavenging. The value of this performance counter should be constant while the scavenging and expiration scenarios are being stress tested. This means that the scheduler does not have any memory leaks. Process (w3wp) Elapsed Time This performance counter keeps track of the elapsed time, in seconds, that the process has been running. In other words, it measures an application block’s availability. The value should remain constant during the stress tests. If the value is less than the length of the test, an ASP.NET recycle occurred, which may indicate a problem. Memory Pool Paged Bytes This value should be less than 90 MB and remain stable during stress tests. Larger values can indicate that the application block is unnecessarily allocating system objects, such as security tokens or thread handles. The Enterprise Library uses instrumentation that allocates unmanaged handles and performance counters objects. In particular, you should monitor this performance counter during the Cryptography Application Block stress tests.
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iv Contents Testing the Logging App
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Introduction Enterprise Library Tes
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Introduction This section provides
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Introduction Performing Code Revie
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Introduction Setting Up the Crypto
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