FreeBSD and MySQL - mysqld eats CPU alive

Kevin D. Kinsey, DaleCo, S.P. kdk at
Sat Jul 31 20:52:23 PDT 2004

<removed hackers@, database@>

Before the rest of the message ... I think it'd be best not to "shotgun"
your mails like this...

adp wrote:

>I recently posted the following message to MySQL discussion list. The
>response there, and the one I keep finding on Google, is that this is a
>long-standing issue betweeen FreeBSD and MySQL. For me this has been
>happening since FreeBSD 4.4.
>I have one site where we are going to have to move to Linux. I would much
>prefer keeping us on FreeBSD, but we just can't afford the downtime anymore.
>Another site is looking at moving to PostgreSQL on FreeBSD.
>Any help on this? Googling shows a long history of people having these
>problems but no solutions. Please don't give me a URL to a Google showing
>others having this problem--I've seen that and more. I want to know if there
>is a solution. Any help is appreciated!
>I have several MySQL and FreeBSD installs across a few different sites, and
>I consistently have problems with mysqld. It will begin to eat up all of the
>CPU and eventually become unresponsive (or the machine will just burn). I
>can't seem to manually reproduce this, but given enough time a FreeBSD box
>with mysqld will go down.
>Our servers are generally heavily loaded.
>I would say that I'm doing something wrong (although what I could be doing
>wrong I'm not sure), but I recently began working with another company that
>has the EXACT SAME PROBLEM. They are even thinking of moving to PostgreSQL,
>but we are trying to fix mysqld instead for now.
>This behavior has been seen on:
>FreeBSD 4.4, 4.7, 4.9, 4.10
>MySQL 3.x and 4.x
>Typical load: 50 qps
>With and without replication enabled.
>Some sites are SELECT heavy, some are INSERT heavy.
>For one site I think we will be moving from FreeBSD to Linux for the MySQL
>servers since MySQL seems to run like a champ on Linux. We will continue to
>use FreeBSD for everything else.
>Anyone experienced this problem? Is it mysqld or FreeBSD? I can't pinpoint
>the exact issue.

It's certain combinations of the two, best I can tell.  Looks like you
can stay with FBSD if you want to do the tweaking --- be sure and
read the second article if your are going to read the first ....

"FreeBSD or Linux for your MySQL Server?"

"Revisiting FreeBSD vs. Linux for MySQL"


Kevin Kinsey
DaleCo, S.P.

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