-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jason Evans wrote: > jasone 2007-11-27 03:17:30 UTC > > FreeBSD src repository > > Modified files: > lib/libc/stdlib malloc.c > Log: > Implement dynamic load balancing of thread-->arena mapping, based on lock > contention. The intent is to dynamically adjust to load imbalances, which > can cause severe contention. > > Use pthread mutexes where possible instead of libc "spinlocks" (they aren't > actually spin locks). Conceptually, this change is meant only to support > the dynamic load balancing code by enabling the use of spin locks, but it > has the added apparent benefit of substantially improving performance due to > reduced context switches when there is moderate arena lock contention. > > Proper tuning parameter configuration for this change is a finicky business, > and it is very much machine-dependent. One seemingly promising solution > would be to run a tuning program during operating system installation that > computes appropriate settings for load balancing. (The pthreads adaptive > spin locks should probably be similarly tuned.)
What about using rc.d script to export these environment variables? It is not a big deal to do so (and has 0 side impact to previous releases), and works well for my experimental setup that was inspired by David Xu's yieldloops changeset. Cheers, - -- Xin LI <[EMAIL PROTECTED]> http://www.delphij.net/ FreeBSD - The Power to Serve! -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFHS5VAhcUczkLqiksRAtvxAKCDePHcIcCRBT7X2xIxnBkO6EK2+QCfSRku 762vB1RFY0JdH5k5kbcu3Jo= =wB5F -----END PGP SIGNATURE----- _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
