GCC build time using bash vs. dash

[Thomas Schwinge]

Hi!

When recently fixing a GCC configury bug uncovered by using dash for
/bin/sh, we wondered which build-time benefits the use of dash would
actually bring.

kepler is a Xen domU on a AMD Athlon II X2 215 with 2700 MHz, the domU
has 1 GiB of RAM, and is running Debian GNU/Linux testing x86.  Debian
packages bash 4.1-3, dash 0.5.5.1-7.4.

coulomb is a AMD Athlon XP with 1466 MHz, has 1 GiB of RAM, and is
running Debian GNU/Hurd unstable x86.  Debian packages bash 4.1-3+hurd.1,
dash 0.5.5.1-7.4.

      kepler      coulomb
bash  2 h 45 min  10 h 55 min
dash  2 h 35 min  10 h 50 min

This data is from one iteration only (I did not repeat the experiment),
but both systems have been idle apart from the GCC build.  The build was
essentially a native ``configure && make'', based on GCC Git sources,
master branch, 7c9f953a01d23c6b6885dc908d5b1dba8009efd4 (2011-07-18),
plus a few patches (minor to this experiment).


Grüße,
 Thomas

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