Josh Boyer wrote: > On Mon, May 7, 2012 at 8:43 AM, Jim Meyering <jim@xxxxxxxxxxxx> wrote: >> Today I noticed that some tests from coreutils' test suite >> were taking far longer than they used to on rawhide. >> For example, run this command in an empty directory: >> >> seq 200000|env time xargs touch >> >> it takes < 5s on F17 3.3.4-1.fc17.x86_64 ext4/sdb8/SSD, yet >> it takes 47s on rawhide 3.4.0-0.rc5.git5.1.fc18.x86_64 ext4/vda1/SSD >> >> 10x performance hit... ouch. >> >> Does anyone know why? > > Rawhide has all the kernel debug options turned on. It isn't > worthwhile doing a comparison when those are enabled. You could try > again with the first -rc6 build that shows up, as that will have the > options disabled. Hi Josh, I've just rerun the test with 3.4.0-0.rc6.git1.1.fc18.x86_64, and it takes just as long, so the hit is *not* due to debug options: $ seq 200000|env time xargs touch 0.17user 41.98system 0:48.22elapsed 87%CPU (0avgtext+0avgdata 1424maxresident)k 88inputs+0outputs (0major+4502minor)pagefaults 0swaps -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
