HI,
Does the mysql in centos compiled with multi processor support? i have a mysql in centos 5 running in a core2duo processor and it seems that it only uses 1 processor.
On Sat, Oct 11, 2008 at 12:03 AM, John R Pierce pierce@hogranch.com wrote:
Mark Quitoriano wrote:
HI,
Does the mysql in centos compiled with multi processor support? i have a mysql in centos 5 running in a core2duo processor and it seems that it only uses 1 processor.
how many connections are you making to mysql?
around 50-100 connection
On Fri, Oct 10, 2008 at 11:50, Mark Quitoriano markquitoriano@gmail.com wrote:
Does the mysql in centos compiled with multi processor support? i have a mysql in centos 5 running in a core2duo processor and it seems that it only uses 1 processor.
How many tables are you querying in MySQL?
If you use MyISAM tables (still the default), only one thread can access a table at a time, so you won't get more performance out of SMP to accesses to the same table.
HTH, Filipe
On Sat, Oct 11, 2008 at 12:56 AM, Filipe Brandenburger filbranden@gmail.com wrote:
On Fri, Oct 10, 2008 at 11:50, Mark Quitoriano markquitoriano@gmail.com wrote:
Does the mysql in centos compiled with multi processor support? i have a mysql in centos 5 running in a core2duo processor and it seems that it only uses 1 processor.
How many tables are you querying in MySQL?
If you use MyISAM tables (still the default), only one thread can access a table at a time, so you won't get more performance out of SMP to accesses to the same table.
Hi,
What do you recommend me to do so i can optimize my database on a multi-core processor? and i haven't got an answer for the mysql package for centos 5 is the multi-threading supported?
Thanks!
Mark Quitoriano wrote:
What do you recommend me to do so i can optimize my database on a multi-core processor? and i haven't got an answer for the mysql package for centos 5 is the multi-threading supported?
each connection to mysql spawns a thread, however under various conditions the threads can block each other, including if they are stacking up on table locks to update the same table.
otherwise, yes, mysql is fully multithreaded, as long as you're making multiple queries concurrently via different connections
On Tue, Oct 14, 2008 at 12:29 PM, John R Pierce pierce@hogranch.com wrote:
Mark Quitoriano wrote:
What do you recommend me to do so i can optimize my database on a multi-core processor? and i haven't got an answer for the mysql package for centos 5 is the multi-threading supported?
each connection to mysql spawns a thread, however under various conditions the threads can block each other, including if they are stacking up on table locks to update the same table.
otherwise, yes, mysql is fully multithreaded, as long as you're making multiple queries concurrently via different connections
oh ok got it. But as i can see that with my database server it only eats up 1 core of my core2quad processor. how can i optimize mysql to use all 4 core of my processor?
thanks again for the answers
Mark Quitoriano wrote:
oh ok got it. But as i can see that with my database server it only eats up 1 core of my core2quad processor. how can i optimize mysql to use all 4 core of my processor?
you said you had 50-100 simultaneous connections to mysql? these are presumably issuing various queries at overlapping times? I find it pretty hard to believe its only using one processor unless all these queries are updates to the same table, using full table locking (myISAM for instance)
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Filipe Brandenburger -
John R Pierce -
Mark Quitoriano