------- Comment #6 from kargl at gcc dot gnu dot org 2009-07-16 20:29 ------- (In reply to comment #5) > (In reply to comment #4) > > Compiles OK at -O2, but more slowly than with 4.1.2: > > > > 4.1.2 4.4.0 > > -O2: > > real 1m19.827s real 2m58.945s > > -O3: > > real 1m30.645s real 10m5.166s > > > > Even if -O3 ultimately generates correct code in some suitably large > > configuration, > > it may be that some optimizer > > algorithms could stand tuning to avoid time-consuming > > but ultimately unprofitable blind alleys. > > > > Hmmm, something is definitely admiss here. After 22 minutes of > compiling with -O3 on my system, f951 'appears' stuck with only > 450 MB of used memory. I attached ktrace to the process and > found
After 26 minutes, I suddenly see in top(1) 50879 sgk 1 -20 0 7346M 6724M swread 1 26:21 1.51% f951 so -O3 is causing a massive increase in the amount of memory required. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40773
