>>>>> "Juri" == Juri Kaljundi <jk@stripped> writes:
Juri> We are having problems with mysql when we switched from Redhat Linux to
Juri> Solaris 7 Intel (due to better SMP support on Solaris). The mysql seems a
Juri> little bit slower on Solaris, but the real problem is that under high low
Juri> the mysql process starts to take 95% of CPU and at that moment it just
Juri> freezes. mysql.server stop does not kill the process, it just stays
Juri> hovering there at 85-95% even when nobody is accessing it anymore.
Juri> When the mysql goes slow, mysqladmin pro sometimes shows quite a lot of
Juri> state locked, probably for updates being done.
Juri> truss on mysql process shows just thousands of lines per second like:
Juri> llseek(35, 453423, SEEK_SET) = 453423
Juri> read(35, "030F\00F\001 C03\0\015", 11) = 11
Juri> llseek(35, 453428, SEEK_SET) = 453428
Juri> read(35, "01 C03\0\015\0\0\0\0\0\0".., 15) = 15
Juri> llseek(35, 453443, SEEK_SET) = 453443
Juri> read(35, "030F\00F\001 B03\0\017", 11) = 11
The above means that MySQL is doing table scanning on a dynamic-row table.
Juri> Solaris 7 Intel x86, gcc 2.95.1, mysql 3.22.26 or 3.22.27. mysql accessed
Juri> over perl or php. Tables are small, probably not over 10-20 thousand
Juri> records each. Worked quite OK on Linux on even slower machine.
Juri> CXXFLAGS were like -O6 -fomit-frame-pointer -felide-constructors
Juri> -fno-exceptions -fno-rtti -fno-implicit-templates
Juri> What to explore? Where to look?
Juri> Juri Kaljundi
Juri> jk@stripped Mustamae tee 55, Tallinn 10621, Estonia
Juri> AS Stallion Tel: +372-656 7720
Juri> http://www.stallion.ee/ Fax: +372-656 7727
Hi!
Some suggestions:
If you can mail the output from 'mysqladmin proc ext var' ; We may be
able to give you some suggestions.
Have you tried '/usr/proc/bin/pstack' when MySQL goes slow/dies. This
may help find out what MySQL is doing!
Regards,
Monty
