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[Bug fortran/51727] Changing module files
- From: "Joost.VandeVondele at mat dot ethz.ch" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 15 Oct 2012 14:14:12 +0000
- Subject: [Bug fortran/51727] Changing module files
- Auto-submitted: auto-generated
- References: <bug-51727-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51727
--- Comment #25 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> 2012-10-15 14:14:12 UTC ---
Just to provide some additional numbers on how important this patch is for
practical development (and of course to +1 on backports).... for a 'typical
code change' on a CP2K tree (add an unused local variable to a subroutine) the
speedup due to avoided recompilation (on a 32 core server) can be obtained from
the following compile timings (repeatable for various tries):
4.6(unpatched)
real 1m45.064s
4.7(patched)
real 0m14.958s
I really think this is a pretty substantial bug fix of an existing feature.