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Add mutex test.

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This commit is contained in:
Bruce Momjian 2001-09-06 16:51:12 +00:00
parent 11808a9faa
commit e9dc342e33
1 changed files with 60 additions and 2 deletions
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doc/TODO.detail/performance
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@ -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>
To: "'pgsql-hackers@postgresql.org'" <pgsql-hackers@postgresql.org>
Subject: [HACKERS] Using POSIX mutex-es
Date: Wed, 1 Aug 2001 12:04:24 -0700
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Status: OR
1. Just changed
TAS(lock) to pthread_mutex_trylock(lock)
S_LOCK(lock) to pthread_mutex_lock(lock)
S_UNLOCK(lock) to pthread_mutex_unlock(lock)
(and S_INIT_LOCK to share mutex-es between processes).
2. pgbench was initialized with scale 10.
SUN WS 10 (512Mb), Solaris 2.6 (I'm unable to test on E4500 -:()
-B 16384, wal_files 8, wal_buffers 256,
checkpoint_segments 64, checkpoint_timeout 3600
50 clients x 100 transactions
(after initialization DB dir was saved and before each test
copyed back and vacuum-ed).
3. No difference.
Mutex version maybe 0.5-1 % faster (eg: 37.264238 tps vs 37.083339 tps).
So - no gain, but no performance loss "from using pthread library"
(I've also run tests with 1 client), at least on Solaris.
And so - looks like we can use POSIX mutex-es and conditional variables
(not semaphores; man pthread_cond_wait) and should implement light lmgr,
probably with priority locking.
Vadim
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