Linux IO Schedulers and MySQL
Found a great article about Linux IO Schedulers today which is quite interesting. It goes in details about schedulers and explains in which of workloads which of schedulers is best.The interesting...
View ArticleWorking with many files and file system fragmentation
Working on performance optimization project (not directly MySQL related) we did a test – creating 100 files writing 4K in the random file for some time and when checking the read speed on the files we...
View ArticleThe tool I’ve been waiting for years
I’ve just been pointed to the nice tool which I was waiting for years to see. It is fincore – little perl script which allows you to see what pages of file are cached in OS memory. This is really cool....
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Should you have your swap file enabled while running MySQL ?
So you’re running dedicated MySQL Linux box with plenty of memory, so the good question arises if you should have swap file enabled or disable it ? I’ve seen production successfully running on boxes...
View ArticleMySQL, AIX5L and malloc()
Some time ago I get brand new IBM POWER6 server as the replacement for “old” P5 used to host Oracle database. Because we planed to use advanced virtualization with VIOS + LPAR/DLPAR I conceived the...
View ArticleBeware: ext3 and sync-binlog do not play well together
One of our customers reported strange problem with MySQL having extremely poor performance when sync-binlog=1 is enabled, even though the system with RAID and BBU were expected to have much better...
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Linux schedulers in tpcc like benchmark
I mentioned earlier that IO scheduler CFQ coming by default in RedHat / CentOS 5.x may be not so good for MySQL. And yesterday one customer reported that just changing cfq to noop solved their InnoDB...
View ArticleSystemTap – DTrace for Linux ?
Since DTrace was released for Solaris I am missing it on Linux systems… It can’t be included in Linux by the same reason why ZFS can’t be – it’s licensing issue. Both ZFS and DTrace are under CDDL,...
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Webinar: Best Practices for MySQL Scalability on May 1
“Best Practices for MySQL Scalability.”If you have not already done so, I encourage you to register for my “Best Practices for MySQL Scalability” Webinar which will take place on May 1st at 10 a.m....
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How to improve InnoDB performance by 55% for write-bound loads
During April’s Percona Live MySQL Conference and Expo 2014, I attended a talk on MySQL 5.7 performance an scalability given by Dimitri Kravtchuk, the Oracle MySQL benchmark specialist. He mentioned at...
View ArticleJeremy Cole on MySQL Replication
Jeremy Cole recently posted very nice post about MySQL Replication Performance. There are however few points I should comment on. Jeremy Speaks about MyISAM and Innodb in the same terms, in fact they...
View ArticleMyISAM concurrent insert
Arjen posted a good note about MyISAM concurrent-insert features, though I should mention concurrent-insert can be cause of scalablity and peformance problems on SMP boxes, especially on queries...
View ArticleFreeBSD tests
I’m continuing my experiments with different OS and today I tested FreeBSD 6.0 on my box. (more details about box and benchmark see here...
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