On Friday 09 May 2008 04:32:10 pm Saravanan wrote: > --- On Sat, 5/10/08, JW <[EMAIL PROTECTED]> wrote: > > From: JW <[EMAIL PROTECTED]> > > Is it correct that mysql 5.0 is threaded in such a way that > > a DB server taking lots of queries from many clients will be able\ > > to utilize lots of CPUs/core on a multi-cpu, multi-core system? > > > > Or are multi CPUs/cores a waste? > > > > Thanks, > > > > JW
> Yes it can use multiple cores. Mysqld is a multithreaded service. > > Saravanan I just found this interesting tidbit: ******* "MySQL On Multi-Core Machines - The DevShed technical tour explains that MySQL can spawn new threads, each of which can execute on a different processor/core. What it doesn’t say is that a single thread can only execute on a single core, and if that thread locks a table, then no other threads that need that table can execute until the locking thread/query is complete. Short answer: MySQL works well on multi-core machines until you lock a table." ******** One of our programmers was wondering if this is referring to such implicit lock such as when you you read from a table (SELECT) or only explicit table locking, which we don't (currently) use in any of our code. Does anyone know? JW -- ---------------------- System Administrator - Cedar Creek Software http://www.cedarcreeksoftware.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]