March 18, 2008

The tool I’ve been waiting for years

Posted by peter |

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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Posted by peter @ 9:54 pm :: operating systems :: 9 comments
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Working with many files and file system fragmentation

Posted by peter |

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 end up with, compared to just writing the file sequentially and reading it back.

The performance difference was huge – we could read single file at 80MB/sec while fragmented files only deliver about 2MB/sec – this is a massive difference.
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Posted by peter @ 1:10 pm :: operating systems :: 10 comments
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