[Bug tree-optimization/44563] GCC uses a lot of RAM when compiling a large numbers of functions

["rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from rguenth at gcc dot gnu dot org  2010-06-17 10:44 -------
Growth in time and memory is linear in the number of functions for me (GCC
4.5).

rguenther@murzim:/tmp> ~/bin/maxmem2.sh /usr/bin/time gcc-4.5 -S gcc_16kgen1.c
-o /dev/null
14.60user 0.61system 0:15.42elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k
80inputs+0outputs (0major+129132minor)pagefaults 0swaps
total: 537864 kB
rguenther@murzim:/tmp> ~/bin/maxmem2.sh /usr/bin/time gcc-4.5 -S gcc_32kgen1.c
-o /dev/null
29.81user 1.43system 0:31.45elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+222866minor)pagefaults 0swaps
total: 905120 kB
rguenther@murzim:/tmp> ~/bin/maxmem2.sh /usr/bin/time gcc-4.5 -S gcc64k3.c -o
/dev/null
60.65user 2.72system 1:03.92elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+442682minor)pagefaults 0swaps
total: 1766812 kB

anyway - Honza, this is probably another nice target for profiling ...

Good old GCC 3.3 uses less memory but takes more compile-time btw.

I suppose this is another case where we build a load of INTEGER_CSTs
that remain live (like in the huge array-initializer case).  Which doesn't
explain the compile-time issue of course.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44563