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Displaying posts with tag: innodb flush method (reset)
MySQL Swapping With Fsync

One problem that’s a lot less common these days is swapping. Most of the issues that cause swapping with MySQL have been nailed down to several different key configuration points, either in the OS or MySQL, or issues like the swap insanity issue documented by Jeremy Cole back in 2010. As such, it’s usually pretty easy to resolve these issues and keep MySQL out of swap space. Recently, however, we had tried all of the usual tricks but had an issue where MySQL was still swapping.

The server with the issue was a VM running with a single CPU socket (multiple cores), so we knew it wasn’t NUMA. Swappiness and MySQL were both configured correctly and when you checked the output of free -m it showed 4735M of memory available.

[sylvester@host~]$ free -m
              total        used        free      shared  buff/cache …
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MySQL variable innodb_flush_method – summarized

innodb_flush_method variable specifies how InnoDB opens and flushes log and data files. In Innodb optimization, setting the variable innodb_flush_method tweaks the performance most of the times but there are cases of otherwise though. If innodb_flush_method is set to O_DIRECT it’d avoid double buffering and reduce swap pressure and helps improving performance. innodb_flush_method has been covered […]

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