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big slowdown in egcs-1.1.2->gcc-2.95 on alpha
- To: gcc@gcc.gnu.org, gcc-bugs@gcc.gnu.org
- Subject: big slowdown in egcs-1.1.2->gcc-2.95 on alpha
- From: Brad Lucier <lucier@math.purdue.edu>
- Date: Wed, 4 Aug 1999 11:15:21 -0500 (EST)
- Cc: lucier@math.purdue.edu, staff@math.purdue.edu, jlee@math.purdue.edu, hosking@cs.purdue.edu, wilker@math.purdue.edu
I'm running a Genetic Programming system, where compile times are as
important as run times. I noticed that gcc-2.95 is a *lot* slower than
egcs-1.1.2 on my alpha-ev6 running Red Hat 6.0 with binutils 2.9.5.0.3
Here are some typical times:
egcs-1.1.2:
/usr/bin/time /usr/bin/gcc -mcpu=ev6 -fPIC -O1 -c -D___DYNAMIC -D___SINGLE_HOST system.c
106.60user 0.17system 0:13.49elapsed 790%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (2248major+8092minor)pagefaults 0swaps
gcc-2.9.5:
/usr/bin/time /export/u10/gcc-2.95/bin/gcc -mcpu=ev6 -fPIC -O1 -c -D___DYNAMIC -D___SINGLE_HOST system.c
250.77user 0.24system 0:31.59elapsed 794%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (2330major+15298minor)pagefaults 0swaps
(The user and system times on this box are too big by a factor of 8.)
I try to be an independent guy---I installed a test version compiled with
-pg, but gprof on my platform dumps core (both the original one and the one
with 2.9.5.0.3) so that isn't much help.
Any suggestions? Anybody else notice this?
Brad Lucier lucier@math.purdue.edu