75 lines
2 KiB
Text
75 lines
2 KiB
Text
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------------
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Benchmarking
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------------
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There is a set a benchmarking programs in the
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"tests" directory. These should be runnable using the
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following command-lines corresponding to each of the possible
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library builds:
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MSVC:
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nmake clean VC-bench
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nmake clean VCE-bench
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nmake clean VSE-bench
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Mingw32:
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make clean GC-bench
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make clean GCE-bench
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UWIN:
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The benchtests are run as part of the testsuite.
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Mutex benchtests
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----------------
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benchtest1 - Lock plus unlock on an unlocked mutex.
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benchtest2 - Lock plus unlock on a locked mutex.
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benchtest3 - Trylock on a locked mutex.
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benchtest4 - Trylock plus unlock on an unlocked mutex.
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Each test times up to three alternate synchronisation
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implementations as a reference, and then times each of
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the four mutex types provided by the library. Each is
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described below:
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Simple Critical Section
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- uses a simple Win32 critical section. There is no
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additional overhead for this case as there is in the
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remaining cases.
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POSIX mutex implemented using a Critical Section
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- The old implementation which uses runtime adaptation
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depending on the Windows variant being run on. When
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the pthreads DLL was run on WinNT or higher then
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POSIX mutexes would use Win32 Critical Sections.
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POSIX mutex implemented using a Win32 Mutex
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- The old implementation which uses runtime adaptation
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depending on the Windows variant being run on. When
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the pthreads DLL was run on Win9x then POSIX mutexes
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would use Win32 Mutexes (because TryEnterCriticalSection
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is not implemented on Win9x).
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PTHREAD_MUTEX_DEFAULT
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PTHREAD_MUTEX_NORMAL
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PTHREAD_MUTEX_ERRORCHECK
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PTHREAD_MUTEX_RECURSIVE
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- The current implementation supports these mutex types.
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The underlying basis of POSIX mutexes is now the same
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irrespective of the Windows variant, and should therefore
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have consistent performance.
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Semaphore benchtests
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--------------------
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benchtest5 - Timing for various uncontended cases.
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In all benchtests, the operation is repeated a large
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number of times and an average is calculated. Loop
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overhead is measured and subtracted from all test times.
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