Nicholas, ----- Original Message ----- From: ""Nicholas Gaugler"" <[EMAIL PROTECTED]> Newsgroups: mailing.database.mysql Sent: Wednesday, October 09, 2002 8:22 AM Subject: mysqld Threads with Innobase
> I know it's not very important in normal day to day operations, but does > anyone know what each thread does within mysqld with Innobase installed? > It'd be nice to know what Innobase is doing when a process is pinned at 100% > of the cpu..if it's doing cleanup from a huge update, etc. > /usr/local/sqldrive/mysql-4.0.4-beta/bin/mysqld --defaults-extra-file=/usr/l > ocal/sqldrive/mysql-4.0.4-beta/data/my > 1682 ttyp1 S 0:00 > /usr/local/sqldrive/mysql-4.0.4-beta/bin/mysqld --defaults-extra-file=/usr/l > ocal/sqldrive/mysql-4.0.4-beta/data/my ... only one thread, the main thread, does background cleaning operations. You can see from SHOW INNODB STATUS what the main thread is currently doing. It is a good idea to tell the id of that thread in the printout of SHOW INNODB STATUS. I will add it to 4.0.5. In your case there are lots of threads eating up 100 % of CPU. If the performance is very slow, this looks like yet another case of Linux 'thread thrashing' which is plaguing both MyISAM and InnoDB tables under certain loads. It is a clear performace bug in Linux or glibc, and we are working to find a fix or a workaround to that problem. You can try setting set-variable = innodb_thread_concurrency = 1 in my.cnf to remove the thread thrashing. That helps in some cases > Thanks! > > nickg Best regards, Heikki Tuuri Innobase Oy --- InnoDB - transactions, hot backup, and foreign key support for MySQL See http://www.innodb.com, download MySQL-Max from http://www.mysql.com sql query --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
