Enterprise Library Test Guide - Willy .Net

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Enterprise Library Test Guide
In the scalability tests for the Data Access Application Block, the processor queue
lengths began to lengthen as the number of concurrent users increased and the CPUs
reached their limits. Values for processor queue lengths were initially zero and increased
to between 7 ms and 10 ms after the CPUs could no longer support any more
users.
The servers are always CPU bound. Other than the processors, there are no other
dependencies that can cause bottlenecks. The change in memory size between the 2
processor configurations and 4 processor configurations (for both the 32-bit computers
and 64-bit computers) did not affect the relevant measurements.
Here is a summary of the results:
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The 64-bit computers outperform the 32-bit computers by 45 percent for the
transactions per second measurement and for the total transactions measurement.
For all cases shown in Figure 7, there should be no I/O activity when the % Disk
Time counter is less than 7 percent.
The 32-bit computers with 2 processors could not support more than 10 concurrent
users. The 32-bit computers with 4 processors could not support more than 50
concurrent users. The 64-bit computers with 2 processors could not support more
than 10 concurrent users. The 64-bit computers with 4 processors could not
support more than 50 concurrent users. Scalability increases as the number of
concurrent users were added to the test mix when bigger deltas were observed
between 2 processors and 4 processors (32-bit computers and 64-bit computers).
The servers’ working sets always require less than 40 MB for all configurations.
Measurements of the memory required by the working sets and the values of the
CLR % GC performance counter indicate that memory size did not cause any
bottlenecks during the scalability tests. All bottlenecks were caused by the limit to
the number of users the CPUs could support.
The Logging Application Block has good scalability. This is largely due to the low
number of contentions per second. The value of the % Contention rate/sec performance
counter was approximately 8 per second with saturation of CPU in all
cases and between 2 percent and 3 percent below saturation levels.
Analysis of Caching Application Block Scalability Test
Figure 8 is a graph of the test results. It shows the results for both the 32-bit computers
and 64-bit computers, each with 2 processors and then 4 processors.