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[Bug fortran/47495] .mod files: File modification time - Makefile build issue
- From: "Joost.VandeVondele at pci dot uzh.ch" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 29 Jan 2011 19:31:26 +0000
- Subject: [Bug fortran/47495] .mod files: File modification time - Makefile build issue
- Auto-submitted: auto-generated
- References: <bug-47495-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47495
--- Comment #12 from Joost VandeVondele <Joost.VandeVondele at pci dot uzh.ch> 2011-01-29 19:31:14 UTC ---
(In reply to comment #9)
> test.mod: test.f90
> gfortran -fsyntax-only test.f90
>
> test.o: test.f90 test.mod
> gfortran -c -O3 test.f90
>
> could speed things up for large parallel projects since the next file can be
> compiled (modded ?) as soon as the .mod of the previous one has been generated,
> there is no need to wait for the .o.
Actually this seems to work rather well. I have been testing this, and for CP2K
on a 48 core server, I get a 2-fold speedup for a fresh build. This really
seems something to consider seriously.