From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "Merlin Moncure" <merlin(dot)moncure(at)rcsonline(dot)com> |
Cc: | "Marc Cousin" <mcousin(at)sigma(dot)fr>, pgsql-performance(at)postgresql(dot)org, pgsql-hackers-win32(at)postgresql(dot)org |
Subject: | Re: [PERFORM] insert performance for win32 |
Date: | 2005-09-07 15:02:13 |
Message-ID: | 27312.1126105333@sss.pgh.pa.us |
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Lists: | pgsql-hackers-win32 pgsql-performance |
"Merlin Moncure" <merlin(dot)moncure(at)rcsonline(dot)com> writes:
> ok, I've been in crunching profile profile graphs, and so far have been
> only been able to draw following conclusions.
> For bulk, 'in-transaction' insert:
> 1. win32 is slower than linux. win32 time for each insert grows with #
> inserts in xact, linux does not (or grows much slower). Win32 starts
> out about 3x slower and grows to 10x slower after 250k inserts.
Just to be clear: what you were testing was
BEGIN;
INSERT ... VALUES (...);
repeat insert many times
COMMIT;
with each statement issued as a separate PQexec() operation, correct?
Was this set up as a psql script, or specialized C code? (If a psql
script, I wonder whether it's psql that's chewing the time.)
> 2. ran a 50k profile vs. 250k profile. Nothing jumps out as being
> slower or faster: most time is spent in yyparse on either side. From
> this my preliminary conclusion is that there is something going on in
> the win32 api which is not showing in the profile.
Hmm. Client/server data transport maybe? It would be interesting to
try inserting the same data in other ways:
* COPY from client
* COPY from disk file
* INSERT/SELECT from another table
and see whether you see a similar slowdown.
regards, tom lane
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