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From: Magnus Holmgren <magnushol AT gmail DOT com>
Subject: Re: [ANNOUNCEMENT] Updated: cygwin-1.7.10-1
Date: Mon, 6 Feb 2012 21:39:38 +0000 (UTC)
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Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:

> - Improve fork/exec performance on 64 bit systems.

If fork/exec became faster, something else has slowed down noticeably on my
64-bit Vista system. Using a fairly fork-heavy build script as the benchmark
(and running it when nothing needs to be re-built), 1.7.10 is about 25% slower.
Switching to cygwin1.dll 1.7.9 speeds things up again (and I only changed the
DLL; it seemed to work fine for this test at least).

The "while [ 1 ]; do date; done | uniq -c" loop is about 15% faster with 1.7.10
though.

Lines like these stand out in a quick look in the strace log (about 75 MB):

1172898 1173730 [main] sh 1484 child_copy: dll bss - hp 0xEC low 0x611FC000,
high 0x61230770, res 1

Every 4-5 print of "child_copy: dll bss" starts with a big number like that
(values in the 50000-100000 range are more common). Don't know if this is
relevant...

  Magnus



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