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Postings from January 2003
Regarding the bug #20218 "perl -d now an order of magnitude slower
5.6.0 -> 5.8.0" (http://rt.perl.org/rt2/Ticket/Display.html?id=20218)
I now found out that the change #9754
[ 9754] By: jhi on 2001/04/19 11:56:07
Log: Subject: PATCH: Propagate low byte of hints in cop.op_private
From: Robin Houston <robin@kitsite.com>
Date: Wed, 18 Apr 2001 17:58:33 +0100
Message-ID: <20010418175833.B8976@puffinry.freeserve.co.uk>
Branch: perl
! ext/B/B/Deparse.pm op.c
is the one that caused the major speed bump between 5.7.1 and 5.7.2:
5.6.0 : 0.58 0.03
5.6.1 : 0.58 0.03
5.7.0 : 0.58 0.05
5.7.1 9670: 0.62 0.05
9718: 0.61 0.05
9742: 0.63 0.05
9752: 0.64 0.05
9754: 3.39 0.05
9762: 3.42 0.05
9885: 3.43 0.05
10105: 3.43 0.05
10517: 3.36 0.04
5.7.2 11355: 3.20 0.05
5.7.3 15039: 4.58 0.05
5.8.0 17638: 4.02 0.07
blead : 4.07 0.08
The times are user + system seconds, the test script is the eventlog.pl
from the perlbug thread, the input is the first 1000 lines of the 'xaa',
the test command is:
time PERLDB_OPTS=noTTY ./perl -Ilib -d eventpos.pl xab> /dev/null 2>/dev/null
Removing the #9754 from the 5.8.0 restores the reasonable -d times
(there's still some slowdown introduced between 5.7.2 and 5.7.3 that
needs to be found), but (unsurprisingly) breaks the ext/B/t/deparse.t
test, the hints are not deparsed correctly. But the deparse is not
the only one: also some of the locale pragma tests start failing.
Failed Test Stat Wstat Total Fail Failed List of Failed
-------------------------------------------------------------------------------
../ext/B/t/deparse.t 17 14 82.35% 2-14 16
../lib/locale.t 117 16 13.68% 2-9 15 54 105-106 108-109
113 115
46 tests and 268 subtests skipped.
Failed 2/712 test scripts, 99.72% okay. 30/68220 subtests failed, 99.96% okay.
--
Jarkko Hietaniemi <jhi@iki.fi> http://www.iki.fi/jhi/ "There is this special
biologist word we use for 'stable'. It is 'dead'." -- Jack Cohen
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