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big slowdown in egcs-1.1.2->gcc-2.95 on alpha
- To: gcc at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org
- Subject: big slowdown in egcs-1.1.2->gcc-2.95 on alpha
- From: Brad Lucier <lucier at math dot purdue dot edu>
- Date: Wed, 4 Aug 1999 11:15:21 -0500 (EST)
- Cc: lucier at math dot purdue dot edu, staff at math dot purdue dot edu, jlee at math dot purdue dot edu, hosking at cs dot purdue dot edu, wilker at math dot purdue dot 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