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344 lines
12 KiB
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From owner-pgsql-hackers@hub.org Sun Jun 14 18:45:04 1998
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Received: from hub.org (hub.org [209.47.148.200])
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Received: by hawk.illustra.com (5.x/smail2.5/06-10-94/S)
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id AA07922; Sun, 14 Jun 1998 15:35:13 -0700
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From: dg@illustra.com (David Gould)
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Message-Id: <9806142235.AA07922@hawk.illustra.com>
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Subject: [HACKERS] performance tests, initial results
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To: pgsql-hackers@postgreSQL.org
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Date: Sun, 14 Jun 1998 15:35:13 -0700 (PDT)
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Mime-Version: 1.0
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Content-Type: text/plain; charset=US-ASCII
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Content-Transfer-Encoding: 7bit
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Sender: owner-pgsql-hackers@hub.org
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Precedence: bulk
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Status: RO
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I have been playing a little with the performance tests found in
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pgsql/src/tests/performance and have a few observations that might be of
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minor interest.
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The tests themselves are simple enough although the result parsing in the
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driver did not work on Linux. I am enclosing a patch below to fix this. I
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think it will also work better on the other systems.
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A summary of results from my testing are below. Details are at the bottom
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of this message.
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My test system is 'leslie':
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linux 2.0.32, gcc version 2.7.2.3
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P133, HX chipset, 512K L2, 32MB mem
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NCR810 fast scsi, Quantum Atlas 2GB drive (7200 rpm).
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Results Summary (times in seconds)
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Single txn 8K txn Create 8K idx 8K random Simple
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Case Description 8K insert 8K insert Index Insert Scans Orderby
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=================== ========== ========= ====== ====== ========= =======
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1 From Distribution
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P90 FreeBsd -B256 39.56 1190.98 3.69 46.65 65.49 2.27
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IDE
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2 Running on leslie
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P133 Linux 2.0.32 15.48 326.75 2.99 20.69 35.81 1.68
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SCSI 32M
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3 leslie, -o -F
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no forced writes 15.90 24.98 2.63 20.46 36.43 1.69
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4 leslie, -o -F
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no ASSERTS 14.92 23.23 1.38 18.67 33.79 1.58
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5 leslie, -o -F -B2048
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more buffers 21.31 42.28 2.65 25.74 42.26 1.72
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6 leslie, -o -F -B2048
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more bufs, no ASSERT 20.52 39.79 1.40 24.77 39.51 1.55
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Case to Case Difference Factors (+ is faster)
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Single txn 8K txn Create 8K idx 8K random Simple
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Case Description 8K insert 8K insert Index Insert Scans Orderby
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=================== ========== ========= ====== ====== ========= =======
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leslie vs BSD P90. 2.56 3.65 1.23 2.25 1.83 1.35
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(noflush -F) vs no -F -1.03 13.08 1.14 1.01 -1.02 1.00
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No Assert vs Assert 1.05 1.07 1.90 1.06 1.07 1.09
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-B256 vs -B2048 1.34 1.69 1.01 1.26 1.16 1.02
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Observations:
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- leslie (P133 linux) appears to be about 1.8 times faster than the
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P90 BSD system used for the test result distributed with the source, not
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counting the 8K txn insert case which was completely disk bound.
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- SCSI disks make a big (factor of 3.6) difference. During this test the
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disk was hammering and cpu utilization was < 10%.
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- Assertion checking seems to cost about 7% except for create index where
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it costs 90%
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- the -F option to avoid flushing buffers has tremendous effect if there are
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many very small transactions. Or, another way, flushing at the end of the
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transaction is a major disaster for performance.
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- Something is very wrong with our buffer cache implementation. Going from
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256 buffers to 2048 buffers costs an average of 25%. In the 8K txn case
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it costs about 70%. I see looking at the code and profiling that in the 8K
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txn case this is in BufferSync() which examines all the buffers at commit
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time. I don't quite understand why it is so costly for the single 8K row
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txn (35%) though.
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It would be nice to have some more tests. Maybe the Wisconsin stuff will
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be useful.
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----------------- patch to test harness. apply from pgsql ------------
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*** src/test/performance/runtests.pl.orig Sun Jun 14 11:34:04 1998
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Differences %
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----------------- patch to test harness. apply from pgsql ------------
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*** src/test/performance/runtests.pl.orig Sun Jun 14 11:34:04 1998
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--- src/test/performance/runtests.pl Sun Jun 14 12:07:30 1998
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***************
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*** 84,123 ****
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open (STDERR, ">$TmpFile") or die;
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select (STDERR); $| = 1;
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! for ($i = 0; $i <= $#perftests; $i++)
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! {
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$test = $perftests[$i];
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($test, $XACTBLOCK) = split (/ /, $test);
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$runtest = $test;
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! if ( $test =~ /\.ntm/ )
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! {
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! #
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# No timing for this queries
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- #
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close (STDERR); # close $TmpFile
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open (STDERR, ">/dev/null") or die;
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$runtest =~ s/\.ntm//;
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}
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! else
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! {
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close (STDOUT);
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open(STDOUT, ">&SAVEOUT");
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print STDOUT "\nRunning: $perftests[$i+1] ...";
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close (STDOUT);
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open (STDOUT, ">/dev/null") or die;
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select (STDERR); $| = 1;
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! printf "$perftests[$i+1]: ";
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}
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do "sqls/$runtest";
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# Restore STDERR to $TmpFile
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! if ( $test =~ /\.ntm/ )
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! {
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close (STDERR);
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open (STDERR, ">>$TmpFile") or die;
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}
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-
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select (STDERR); $| = 1;
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$i++;
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}
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--- 84,116 ----
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open (STDERR, ">$TmpFile") or die;
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select (STDERR); $| = 1;
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! for ($i = 0; $i <= $#perftests; $i++) {
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$test = $perftests[$i];
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($test, $XACTBLOCK) = split (/ /, $test);
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$runtest = $test;
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! if ( $test =~ /\.ntm/ ) {
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# No timing for this queries
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close (STDERR); # close $TmpFile
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open (STDERR, ">/dev/null") or die;
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$runtest =~ s/\.ntm//;
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}
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! else {
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close (STDOUT);
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open(STDOUT, ">&SAVEOUT");
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print STDOUT "\nRunning: $perftests[$i+1] ...";
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close (STDOUT);
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open (STDOUT, ">/dev/null") or die;
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select (STDERR); $| = 1;
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! print "$perftests[$i+1]: ";
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}
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do "sqls/$runtest";
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# Restore STDERR to $TmpFile
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! if ( $test =~ /\.ntm/ ) {
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close (STDERR);
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open (STDERR, ">>$TmpFile") or die;
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}
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select (STDERR); $| = 1;
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$i++;
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}
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***************
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*** 128,138 ****
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open (TMPF, "<$TmpFile") or die;
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open (RESF, ">$ResFile") or die;
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! while (<TMPF>)
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! {
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! $str = $_;
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! ($test, $rtime) = split (/:/, $str);
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! ($tmp, $rtime, $rest) = split (/[ ]+/, $rtime);
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! print RESF "$test: $rtime\n";
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}
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--- 121,130 ----
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open (TMPF, "<$TmpFile") or die;
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open (RESF, ">$ResFile") or die;
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! while (<TMPF>) {
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! if (m/^(.*: ).* ([0-9:.]+) *elapsed/) {
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! ($test, $rtime) = ($1, $2);
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! print RESF $test, $rtime, "\n";
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! }
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}
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------------------------------------------------------------------------
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------------------------- testcase detail --------------------------
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1. from distribution
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DBMS: PostgreSQL 6.2b10
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OS: FreeBSD 2.1.5-RELEASE
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HardWare: i586/90, 24M RAM, IDE
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StartUp: postmaster -B 256 '-o -S 2048' -S
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Compiler: gcc 2.6.3
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Compiled: -O, without CASSERT checking, with
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-DTBL_FREE_CMD_MEMORY (to free memory
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if BEGIN/END after each query execution)
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DB connection startup: 0.20
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8192 INSERTs INTO SIMPLE (1 xact): 39.58
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8192 INSERTs INTO SIMPLE (8192 xacts): 1190.98
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Create INDEX on SIMPLE: 3.69
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8192 INSERTs INTO SIMPLE with INDEX (1 xact): 46.65
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8192 random INDEX scans on SIMPLE (1 xact): 65.49
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ORDER BY SIMPLE: 2.27
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2. run on leslie with asserts
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DBMS: PostgreSQL 6.3.2 (plus changes to 98/06/01)
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OS: Linux 2.0.32 leslie
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HardWare: i586/133 HX 512, 32M RAM, fast SCSI, 7200rpm
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StartUp: postmaster -B 256 '-o -S 2048' -S
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Compiler: gcc 2.7.2.3
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Compiled: -O, WITH CASSERT checking, with
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-DTBL_FREE_CMD_MEMORY (to free memory
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if BEGIN/END after each query execution)
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DB connection startup: 0.10
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8192 INSERTs INTO SIMPLE (1 xact): 15.48
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8192 INSERTs INTO SIMPLE (8192 xacts): 326.75
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Create INDEX on SIMPLE: 2.99
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8192 INSERTs INTO SIMPLE with INDEX (1 xact): 20.69
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8192 random INDEX scans on SIMPLE (1 xact): 35.81
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ORDER BY SIMPLE: 1.68
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3. with -F to avoid forced i/o
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DBMS: PostgreSQL 6.3.2 (plus changes to 98/06/01)
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OS: Linux 2.0.32 leslie
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HardWare: i586/133 HX 512, 32M RAM, fast SCSI, 7200rpm
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StartUp: postmaster -B 256 '-o -S 2048 -F' -S
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Compiler: gcc 2.7.2.3
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Compiled: -O, WITH CASSERT checking, with
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-DTBL_FREE_CMD_MEMORY (to free memory
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if BEGIN/END after each query execution)
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DB connection startup: 0.10
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8192 INSERTs INTO SIMPLE (1 xact): 15.90
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8192 INSERTs INTO SIMPLE (8192 xacts): 24.98
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Create INDEX on SIMPLE: 2.63
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8192 INSERTs INTO SIMPLE with INDEX (1 xact): 20.46
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8192 random INDEX scans on SIMPLE (1 xact): 36.43
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ORDER BY SIMPLE: 1.69
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4. no asserts, -F to avoid forced I/O
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DBMS: PostgreSQL 6.3.2 (plus changes to 98/06/01)
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OS: Linux 2.0.32 leslie
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HardWare: i586/133 HX 512, 32M RAM, fast SCSI, 7200rpm
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StartUp: postmaster -B 256 '-o -S 2048' -S
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Compiler: gcc 2.7.2.3
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Compiled: -O, No CASSERT checking, with
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-DTBL_FREE_CMD_MEMORY (to free memory
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if BEGIN/END after each query execution)
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DB connection startup: 0.10
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8192 INSERTs INTO SIMPLE (1 xact): 14.92
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8192 INSERTs INTO SIMPLE (8192 xacts): 23.23
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Create INDEX on SIMPLE: 1.38
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8192 INSERTs INTO SIMPLE with INDEX (1 xact): 18.67
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8192 random INDEX scans on SIMPLE (1 xact): 33.79
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ORDER BY SIMPLE: 1.58
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5. with more buffers (2048 vs 256) and -F to avoid forced i/o
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DBMS: PostgreSQL 6.3.2 (plus changes to 98/06/01)
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OS: Linux 2.0.32 leslie
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HardWare: i586/133 HX 512, 32M RAM, fast SCSI, 7200rpm
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StartUp: postmaster -B 2048 '-o -S 2048 -F' -S
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Compiler: gcc 2.7.2.3
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Compiled: -O, WITH CASSERT checking, with
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-DTBL_FREE_CMD_MEMORY (to free memory
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if BEGIN/END after each query execution)
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DB connection startup: 0.11
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8192 INSERTs INTO SIMPLE (1 xact): 21.31
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8192 INSERTs INTO SIMPLE (8192 xacts): 42.28
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Create INDEX on SIMPLE: 2.65
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8192 INSERTs INTO SIMPLE with INDEX (1 xact): 25.74
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8192 random INDEX scans on SIMPLE (1 xact): 42.26
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ORDER BY SIMPLE: 1.72
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6. No Asserts, more buffers (2048 vs 256) and -F to avoid forced i/o
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DBMS: PostgreSQL 6.3.2 (plus changes to 98/06/01)
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OS: Linux 2.0.32 leslie
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HardWare: i586/133 HX 512, 32M RAM, fast SCSI, 7200rpm
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StartUp: postmaster -B 2048 '-o -S 2048 -F' -S
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Compiler: gcc 2.7.2.3
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Compiled: -O, No CASSERT checking, with
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-DTBL_FREE_CMD_MEMORY (to free memory
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if BEGIN/END after each query execution)
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DB connection startup: 0.11
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8192 INSERTs INTO SIMPLE (1 xact): 20.52
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8192 INSERTs INTO SIMPLE (8192 xacts): 39.79
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Create INDEX on SIMPLE: 1.40
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8192 INSERTs INTO SIMPLE with INDEX (1 xact): 24.77
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8192 random INDEX scans on SIMPLE (1 xact): 39.51
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ORDER BY SIMPLE: 1.55
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---------------------------------------------------------------------
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-dg
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David Gould dg@illustra.com 510.628.3783 or 510.305.9468
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Informix Software (No, really) 300 Lakeside Drive Oakland, CA 94612
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"Don't worry about people stealing your ideas. If your ideas are any
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good, you'll have to ram them down people's throats." -- Howard Aiken
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