Enterprise Library Test Guide - Willy .Net

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Testing for Performance and Scalability 225 Area Performance counter name Threshold .NET CLR Memory (w3wp) # Bytes in all Heaps This value should be stable during the stress tests. It indicates the current memory allocated in bytes on the garbage collection heaps. If there is a memory leak within managed memory, this counter increases along with the Process (w3wp)\ Private Bytes performance counter. If there is a memory leak within unmanaged memory, the # Bytes in all Heaps performance counter remains stable, while the Private Bytes performance counter increases. .NET CLR Locks and Threads Contention Rate / sec This number should be less than 9/sec. For Enterprise Library, higher numbers indicate poor scalability, particularly when running the code on computers with multiple processors or to 64-bit computers. A high contention rate indicates poor scalability and low throughput on multi-processor computers. Logical Disk (drive) Current Disk Queue Length This value should be no more than 2 requests per spindle, unless there is paging. Logical Disk (drive) Avg. Disk Read Queue Length This value should be no more than 2 requests per spindle, unless there is paging. Logical Disk (_Total) Avg. Disk Write Queue Length This value should be no more than 2 requests per spindle, unless there is paging. Logical Disk (drive) Avg. Disk/Sec Write Avg. Disk/Sec Read Both of these counters should have values of less than 6 ms. continued
226 Enterprise Library Test Guide Area Performance counter name Threshold Logical Disk (drive) % Idle Time This value should be higher than 90 percent. Values lower indicate that either there is paging or the application block writes to the SQL Server database. This value should be high for computers that host Enterprise Library. System Threads This value should be stable and read in conjunction with the Process\ThreadCount performance counter. System Context Switches/sec This is the rate of switches from one thread to another. The value should not be higher than System\Threads * 20. Higher values indicate that there is either contention or context switching from kernel mode to user mode. The ContextSwitchesPerSec performance counter should linearly increase as the throughput, load, and the number of CPUs increases. If it increases exponentially, there is a problem. For Enterprise Library, this number should be low in all test cases for all application blocks. .NET CLR Security % Time in RT Checks This value should be less than 7 percent. It is the percentage of elapsed time spent performing runtime code access security checks since the last sample. .NET CLR Exceptions (w3wp) # Exceptions Thrown This value should be zero, except for the Exception Handling Application Block, when it should be ignored. This application block causes exceptions that are recorded in the performance monitor. SqlServer:AccessMethods Full Scans/sec This value should be less than 3.
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Enterprise Library Test Guide
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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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Introduction Acknowledgments The f
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Testing the Enterprise Library Core
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