Ian Collins a écrit :
Hi,
I have a HP rp3410 with 4Gb RAM running HPUX 11.11. This is running,
Version: '5.0.26-pro-log' socket: '/tmp/mysql.sock' port: 3306 MySQL
Pro (Commercial)
When this machine is put under load (i.e, a lot of database activity),
the clients are receiving Error 12 errors and the MySQL log has a lot
of errors as follows,
070327 8:24:20 [ERROR] mysql_ha_read: Got error 12 when reading table
'XLDEFN_IN'
070327 8:54:51 [ERROR] mysql_ha_read: Got error 12 when reading table
'XLDEFN_IN'
070327 8:55:19 [ERROR] mysql_ha_read: Got error 12 when reading table
'XLDEFN_IN'
In addition, I see at MySQL startup (in the mysql err log), a number of,
/usr/local/mysql/bin/mysqld: Out of memory (Needed 368389120 bytes)
/usr/local/mysql/bin/mysqld: Out of memory (Needed 276289536 bytes)
My /etc/my.cnf is set as,
[client]
port=3306
socket=/tmp/mysql.sock
[mysqld]
port=3306
socket=/tmp/mysql.sock
set-variable = key_buffer_size=400M
set-variable = max_allowed_packet=15M
default-table-type=InnoDB
datadir=/data/mysql
The machine is indicating it is under any ram pressure, which makes me
think it may be kernel tuning (of course, I may be wrong). Are there any
recommendations for HPUX kernel tuning with MySQL?
Hi,
You probably figured that out by now, but for the book.
You're probably using a 32 bits architecture and then are limited to 4GB
total memory allocation. That being said, that's the maximum you can
have, but the kernel reserved a certain value for it's stack and other
part. Depending of the os, it reserved from 800-2G. For example, many
linuxes cannot go over 2.2Gb without seeing those errors.
I'm not very familiar with HP-UX, so you may find parameter to tweak to
increase that value that you can allocate, but I doubt you could get
more than 3Gb so you may want to decrease your mysql settings so it
doesn't allow that much memory...
Example you set key_buffer_size to 400M, but default table to innodb. SO
if you don't have much myisam table you can reduce that to a much lower
value (say 100M?)
Or you can also decrease the per thread buffer, and limit the
max_connection settings...
I'm sure you could find a lot more info around on the net! This
http://www.mysqlperformanceblog.com/2006/05/17/mysql-server-memory-usage/
also gives a few pertinent information.
If all the memory are needed and you wish to increase those esttings, I
advice to consider a 64 Bits architecture as the next upgrade :) Should
really help with db is starting to get tight in a 32bits one!
Good luck!
--
Mathieu Bruneau
aka ROunofF
===
GPG keys available @ http://rounoff.darktech.org
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