> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:owner-freebsd- > [EMAIL PROTECTED] On Behalf Of Josh Carroll > Sent: Tuesday, November 27, 2007 8:12 AM > To: Ted Mittelstaedt > Cc: [EMAIL PROTECTED]; freebsd-questions@freebsd.org > Subject: Re: Help for very bad perf for MySQL > > > Is Hyperthreading enabled (by default it is not under > > FreeBSD) mysql is heavily dependent on threading, if it is not > > built and linked into the freebsd threads package you will get > > poor performance. Some folks have installed the linux compat libs > > and linked mysql into the linux threads package and reported good > > results. > > Actually, on 6.2, it's better to use libthr instead of libpthread. > This can be done for MySQL only, but to test this without recompiling > MySQL, he can: > > % echo "libpthread.so.2 libthr.so.2" >> /etc/libmap.conf > > Then restart the mysql server and test again. I noticed a huge > increase in performance on 6.2 with libthr instead of libpthread. It > wasn't a 10x improvement, though, so there is definitely something > else going on with his setup. > > Regards, > Josh
Here are some things that helped us on a high-volume MySQL server. -- /etc/sysctl.conf -- (these can be added dynamically from the command line) kern.threads.max_groups_per_proc=40000 kern.threads.max_threads_per_proc=40000 kern.maxfiles=65535 kern.maxfilesperproc=65535 -- /boot/loader.conf -- (You'll have to reboot for these to take effect) kern.maxdsiz="1073741824" # 1GB kern.dfldsiz="1073741824" # 1GB kern.maxssiz="134217728" # 128MB -- /etc/libmap.conf -- (as Josh said) [mysqld] libpthread.so.2 libthr.so.2 libpthread.so libthr.so Regards, Mike _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
