On 08/15/13 13:29, Ivan Voras wrote: > On 15 August 2013 22:19, Colin Percival <cperc...@freebsd.org> wrote: >> For workloads with R parallel reads and W parallel writes, this improves >> the time spent from O((R+W)^2) to O(W*(R+W)); i.e., heavy parallel-read >> workloads become significantly more scalable. >> >> No statistically significant change in buildworld time has been measured, >> but synthetic tests of parallel 'dd > /dev/null' and 'openssl enc >> >/dev/null' >> with the input file cached yield dramatic (up to 10x) improvement with high >> (up to 128 processes) levels of parallelism. > > That's interesting. Have you tried running the "blogbench" benchmark > before & after?
No, I wasn't aware that it existed. Given that this change applies only to parallel operations *on the same vnode* and blogbench seems to have traffic randomly spread between many files, I doubt there would be any difference. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
