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Archive for the ‘Performance’ Category

RRDs + ZFS Compression = Massive Space Savings

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Just wanted to share our experience with using zfs compression on FreeBSD for our rrds.

We’re seen a fantastic 21.41x compression ratio on our 46k rrds stored on a zfs volume compressed with gzip. This means meaning we’re saving 93GB of space by doing this 🙂

The gzip compression is CPU heavy so if you want to use this you need a good amount of CPU available but if your short on IO throughput which tends to be the case when updating this many rrds it also a great way to improve performance.

Written by Dilbert

February 19th, 2011 at 6:56 pm

Posted in FreeBSD,Performance

Logging php errors when using php-fpm

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When moving to using php-fpm to serve pages via nginx from apache, its not very obvious how to see errors logged via the php function error_log, so I thought I’d post how to do it here so others don’t have to do quite a much searching as I did.

Its really simple just ensure both the following php variables are set:

  • error_log
  • log_errors

This can be done either in the php.ini but the method I prefer is setting it up in php-fpm.conf e.g.

<?xml version="1.0" ?>
    <section name="pool">
      <value name="php_defines">
        <value name="error_log">/var/log/php-error.log</value>
        <value name="log_errors">true</value>

Written by Dilbert

September 13th, 2009 at 8:22 pm

Posted in Hackery,Performance