Date: Tue, 2 Jul 2002 15:05:04 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: FreeBSD current users <current@FreeBSD.ORG> Subject: Final test numbers for buildworld under stable, current / with and without softupdates (was Re: something funny with soft updates?) Message-ID: <200207022205.g62M54MF007848@apollo.backplane.com> References: <Pine.BSF.4.21.0206281233500.75410-100000@InterJet.elischer.org> <200206290440.g5T4e6EU009321@apollo.backplane.com>
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I have some new numbers. I finally was able to run the test on
-current with an SMP build. All the results are below. It seems to
confirm my hypothesis that the new cpu-hungry gcc is the main source
of the timing differences.
-Matt
Matthew Dillon
<dillon@backplane.com>
Things to note:
* sys time is an approximate indicator of I/O and matches-up fairly
well between -stable and -current, indicating that the builds on
-current and -stable are doing approximately the same amount of I/O.
* differences in sys times for SMP vs UP tests are a fairly good
indicator of reduced efficiency under SMP, a metric we may be
able to use in future tests.
* user times are consistent comparing SMP & UP under current and a good
indication that -current is timing the processes properly.
* massive differences in user times between -current and -stable is
a fair indication that the new GCC on -current is the cpu-cookie-monster
culprit and also responsible for masking I/O improvements from
softupdates (which remains relatively fixed between -stable and
-current tests). There's nothing wrong with softupdates.
#!/bin/tcsh -f
#
# (all tests run on a DELL2550 2xCPUx/1.1GHz P3s)
cd /usr/src
mv ~dillon/bwtest.out ~dillon/bwtest.out.bak
( /usr/bin/time -l make -j 5 buildworld ) >>& ~dillon/bwtest.out
( /usr/bin/time -l make -j 5 buildworld ) >>& ~dillon/bwtest.out
( /usr/bin/time -l make -j 5 buildworld ) >>& ~dillon/bwtest.out
current, without softupdates (SMP BUILD):
2760.07 real 2514.37 user 777.96 sys
2705.11 real 2507.46 user 784.09 sys
2697.63 real 2513.73 user 778.65 sys
current, with softupdates (SMP BUILD):
2358.11 real 2511.09 user 777.87 sys
2330.06 real 2512.97 user 781.82 sys
2335.10 real 2516.46 user 781.29 sys
current, without softupdates (UP BUILD):
3361.70 real 2365.23 user 535.50 sys
3451.55 real 2368.22 user 537.26 sys
3454.85 real 2369.42 user 536.69 sys
current, with softupdates (UP BUILD):
3122.30 real 2360.70 user 532.54 sys
3083.17 real 2361.14 user 529.53 sys
3085.05 real 2361.59 user 529.32 sys
FOR REFERENCE (builds on -stable)
: (original tests under -stable)
:test1# cat x1 (SMP BUILD, STABLE, WITH SOFTUPDATES)
: 1497.09 real 1397.98 user 612.06 sys
: 1500.12 real 1399.33 user 609.79 sys
: 1494.82 real 1398.30 user 612.46 sys
:test1# cat x2 (SMP BUILD, STABLE, WITHOUT SOFTUPDATES)
: 2449.14 real 1401.34 user 625.54 sys
: 2389.75 real 1400.38 user 629.86 sys
: 2358.82 real 1403.26 user 624.93 sys
:
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