Add mutex test.
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Bruce Momjian
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11808a9faa
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e9dc342e33
@ -345,7 +345,7 @@ From owner-pgsql-hackers@hub.org Tue Oct 19 10:31:10 1999
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From: "Mikheev, Vadim" <vmikheev@SECTORBASE.COM>
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To: "'pgsql-hackers@postgresql.org'" <pgsql-hackers@postgresql.org>
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Subject: [HACKERS] Using POSIX mutex-es
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Date: Wed, 1 Aug 2001 12:04:24 -0700
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Status: OR
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1. Just changed
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TAS(lock) to pthread_mutex_trylock(lock)
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S_LOCK(lock) to pthread_mutex_lock(lock)
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S_UNLOCK(lock) to pthread_mutex_unlock(lock)
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(and S_INIT_LOCK to share mutex-es between processes).
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2. pgbench was initialized with scale 10.
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SUN WS 10 (512Mb), Solaris 2.6 (I'm unable to test on E4500 -:()
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-B 16384, wal_files 8, wal_buffers 256,
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checkpoint_segments 64, checkpoint_timeout 3600
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50 clients x 100 transactions
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(after initialization DB dir was saved and before each test
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copyed back and vacuum-ed).
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3. No difference.
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Mutex version maybe 0.5-1 % faster (eg: 37.264238 tps vs 37.083339 tps).
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So - no gain, but no performance loss "from using pthread library"
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(I've also run tests with 1 client), at least on Solaris.
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And so - looks like we can use POSIX mutex-es and conditional variables
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(not semaphores; man pthread_cond_wait) and should implement light lmgr,
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probably with priority locking.
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Vadim
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