[Bug tree-optimization/26854] [4.3/4.4/4.5 Regression] Inordinate compile times on large routines

[lucier at math dot purdue dot edu]

------- Comment #113 from lucier at math dot purdue dot edu  2010-03-27 04:27 -------
Created an attachment (id=20220)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20220&action=view)
time/mem report compiling compiler.i

This is the time and detailed memory report for 20100302 compiling compiler.i
above with main optimization options -O1 -fschedule-insns2 (precise command
line and configuration options are given at the top of the file).

With these optimization levels cpu time and memory don't look too bad to me. 
The main routines are

 parser                : 320.93 (59%) usr   1.40 (27%) sys 322.62 (59%) wall 
103143 kB (15%) ggc
 tree CFG cleanup      :  73.43 (14%) usr   0.01 ( 0%) sys  73.46 (13%) wall   
1388 kB ( 0%) ggc

Nothing else is above 3%.

I'm building today's gcc on an X86-64 RHEL5 machine with more memory to test
with -O3 -fschedule-insns, as this set of options now gives about 20% speedup
on some of my codes of this type.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26854