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Bruce Momjian
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@ -378,3 +378,135 @@ mkscott@sacadia.com
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From pgsql-hackers-owner+M4304@postgresql.org Tue Feb 6 10:24:21 2001
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Received: from mail.postgresql.org (webmail.postgresql.org [216.126.85.28])
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Tue, 6 Feb 2001 07:05:04 -0800 (PST)
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Date: Tue, 6 Feb 2001 07:05:04 -0800 (PST)
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From: Myron Scott <mscott@sacadia.com>
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X-Sender: mscott@goldengate.kojoworldwide.com.
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To: Karel Zak <zakkr@zf.jcu.cz>
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cc: pgsql-hackers@postgresql.org
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Subject: Re: [HACKERS] Using Threads
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In-Reply-To: <Pine.LNX.3.96.1010206101030.20355B-100000@ara.zf.jcu.cz>
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Message-ID: <Pine.GSO.4.10.10102060650250.4153-100000@goldengate.kojoworldwide.com.>
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Status: OR
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>
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> Sorry I haven't time to see and test your experiment,
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> but I have a question. How you solve memory management?
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> The current mmgr is based on global variable
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> CurrentMemoryContext that is very often changed and used.
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> Use you for this locks? If yes it is probably problematic
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> point for perfomance.
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>
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> Karel
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>
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There are many many globals I had to work around including all the memory
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management stuff. I basically threw everything into and "environment"
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variable which I stored in a thread specific using thr_setspecific.
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Performance is acually very good for what I am doing. I was able to batch
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commit transactions which cuts down on fsync calls, use prepared
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statements from my client using CORBA, and the various locking calls for
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the threads (cond_wait,mutex_lock, and sema_wait) seem pretty fast. I did
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some performance tests for inserts
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20 clients, 900 inserts per client, 1 insert per transaction, 4 different
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tables.
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7.0.2 About 10:52 average completion
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multi-threaded 2:42 average completion
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7.1beta3 1:13 average completion
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If I increased the number of inserts per transaction, multi-threaded got
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closer to 7.1 for inserts. I haven't tested other other types of
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commands
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yet.
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Myron Scott
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mkscott@sacadia.com
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From pgsql-hackers-owner+M4313@postgresql.org Tue Feb 6 12:32:00 2001
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Received: from mail.postgresql.org (webmail.postgresql.org [216.126.85.28])
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for <pgman@candle.pha.pa.us>; Tue, 6 Feb 2001 12:31:59 -0500 (EST)
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Tue, 6 Feb 2001 12:31:51 -0500 (EST)
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Received: from ara.zf.jcu.cz (ara.zf.jcu.cz [160.217.161.4])
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for <pgsql-hackers@postgresql.org>; Tue, 6 Feb 2001 12:31:06 -0500 (EST)
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Tue, 6 Feb 2001 18:31:02 +0100
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Date: Tue, 6 Feb 2001 18:31:02 +0100 (CET)
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From: Karel Zak <zakkr@zf.jcu.cz>
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To: Myron Scott <mscott@sacadia.com>
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cc: pgsql-hackers@postgresql.org
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Subject: Re: [HACKERS] Using Threads
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In-Reply-To: <Pine.GSO.4.10.10102060650250.4153-100000@goldengate.kojoworldwide.com.>
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Message-ID: <Pine.LNX.3.96.1010206182112.3799B-100000@ara.zf.jcu.cz>
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Sender: pgsql-hackers-owner@postgresql.org
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Status: OR
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On Tue, 6 Feb 2001, Myron Scott wrote:
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> There are many many globals I had to work around including all the memory
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> management stuff. I basically threw everything into and "environment"
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> variable which I stored in a thread specific using thr_setspecific.
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Yes, it's good. I working on multi-thread application server
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(http://mape.jcu.cz) and I use for this project some things from PG (like
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mmgr), I planning use same solution.
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> Performance is acually very good for what I am doing. I was able to batch
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> commit transactions which cuts down on fsync calls, use prepared
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> statements from my client using CORBA, and the various locking calls for
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> the threads (cond_wait,mutex_lock, and sema_wait) seem pretty fast. I did
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> some performance tests for inserts
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>
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> 20 clients, 900 inserts per client, 1 insert per transaction, 4 different
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> tables.
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>
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> 7.0.2 About 10:52 average completion
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> multi-threaded 2:42 average completion
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> 7.1beta3 1:13 average completion
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It is very very good for time for 7.1, already look forward to 7.2! :-)
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BTW, I not sure if you anytime in future will see threads in
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official PostgreSQL and if you spending time on relevant things (IMHO).
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Karel
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