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Postgres FD Implementation
Commit 7bce3e95 authored by Bruce Momjian's avatar Bruce Momjian
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Remove mutex mention. Fixed now.

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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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......@@ -371,7 +371,7 @@ Date: Tue, 19 Oct 1999 10:09:15 -0400
Message-ID: <9036.940342155@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Status: OR
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"Hiroshi Inoue" <Inoue@tpf.co.jp> writes:
> 1. shared cache holds committed system tuples.
......@@ -454,7 +454,7 @@ From owner-pgsql-hackers@hub.org Tue Oct 19 21:25:30 1999
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> -----Original Message-----
> From: Hiroshi Inoue [mailto:Inoue@tpf.co.jp]
......@@ -573,7 +573,7 @@ From: Tom Lane <tgl@sss.pgh.pa.us>
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Those of you with long memories may recall a benchmark that Edmund Mergl
drew our attention to back in May '99. That test showed extremely slow
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In-Reply-To: <200101191703.MAA25873@candle.pha.pa.us>; from pgman@candle.pha.pa.us on Fri, Jan 19, 2001 at 12:03:58PM -0500
Status: OR
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On Fri, Jan 19, 2001 at 12:03:58PM -0500, Bruce Momjian wrote:
>
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> > Tom, did we ever test this? I think we did and found that
> > it was the same or worse, right?
......@@ -760,7 +760,7 @@ Subject: Re: 7.2 items
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Bruce Momjian wrote:
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And in addition,
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I think it's possible to implement bitmap indexes with a little
effort using GiST. at least I know one implementation
......@@ -1002,61 +1002,3 @@ Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
From pgsql-hackers-owner+M11649@postgresql.org Wed Aug 1 15:22:46 2001
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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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