Philip M. Gollucci wrote: >>> my.cnf >>> innodb_thread_concurrency = 8 >> You want '0' or performance will suck. There's a basic architectural >> flaw in how mysql handles non-zero concurrency values here (innodb >> accesses are serialized by a global mutex that protects a counter to >> check if it should try to allow more innodb concurrency. Duh.) >> >> Anyway, assuming your disks can keep up you should see a big performance >> boost when you switch to 7.0. This is a fairly big "if" though: I don't >> know if it's even feasible for a write-heavy database to saturate 8 CPUs >> instead of being bottlenecked by disk speeds and leaving the CPUs mostly from /usr/local/share/my-innodb-heavy-4G.cnf
# This permits the application to give the threads system a hint for the # desired number of threads that should be run at the same time. This # value only makes sense on systems that support the # thread_concurrency() # function call (Sun Solaris, for example). # You should try [number of CPUs]*(2..4) for thread_concurrency thread_concurrency = 8 # Number of IO threads to use for async IO operations. This value is # hardcoded to 4 on Unix, but on Windows disk I/O may benefit from a # larger number. innodb_file_io_threads = 4 # Number of threads allowed inside the InnoDB kernel. The optimal value # depends highly on the application, hardware as well as the OS # scheduler properties. A too high value may lead to thread thrashing. innodb_thread_concurrency = 16 Apparently its only set in this file. We should probably submit a bug to MySQL rather then add a patch to ports or do both and remove the ports when its released. -- ------------------------------------------------------------------------ Philip M. Gollucci ([EMAIL PROTECTED]) c:323.219.4708 o:703.749.9295x206 Senior System Admin - Riderway, Inc. http://riderway.com / http://ridecharge.com 1024D/EC88A0BF 0DE5 C55C 6BF3 B235 2DAB B89E 1324 9B4F EC88 A0BF Work like you don't need the money, love like you'll never get hurt, and dance like nobody's watching. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
