Cache Backend Benchmarking with n98-magerun

Published by Christian Münch on July 31, 2014July 31, 2014

This is the start of a series which presents 3rd party n98-magerun modules.

The first one is a module which helps you to benchmark your shop cache system.

It’s a port of a benchmark script by Colin Mollenhour
which was a fork of a symlink cache script by Vinai Kopp.

Installation

The installation is really strait forward:

 mkdir -p ~/.n98-magerun/modules
 cd ~/.n98-magerun/modules
 git clone https://github.com/cmuench/magerun-module-cache-benchmark.git

Usage

After the installation you should see some new cache commands in your n98-magerun command list.

 cache:benchmark:analyse     Analyze the current cache contents.
 cache:benchmark:clean       Flushes cache backend.
 cache:benchmark:comp_test   Test compression library performance
 cache:benchmark:init        Inits cache dataset
 cache:benchmark:load        Load an existing dataset.
 cache:benchmark:ops         Execute a pre-generated set of operations on the existing cache.
 cache:benchmark:tags        Benchmark getIdsMatchingTags method.

First run “cache:benchmark:init” which generates cache entries.
The init command can has a lot of paramters.

--name                (default to default) (default: "default")
--keys                Number of cache keys (default to 10000) (default: 10000)
--tags                Number of cache tags (default to 2000) (default: 2000)
--min-tags            The min number of tags to use for each record (default 0) (default: 0)
--max-tags            The max number of tags to use for each record (default 0) (default: 15)
--min-rec-size        The smallest size for a record (default 1) (default: 1)
--max-rec-size        The largest size for a record (default 1) (default: 1024)
--clients             The number of clients for multi-threaded testing (defaults to 4) (default: 4)
--ops                 The number of operations per client (defaults to 10000) (default: 10000)
--write-chance        The chance-factor that a key will be overwritten (defaults to 1000) (default: 1000)
--clean-chance        The chance-factor that a tag will be cleaned (defaults to 5000) (default: 5000)
--seed                The random number generator seed (default random)
--help (-h)           Display this help message.
--quiet (-q)          Do not output any message.
--verbose (-v|vv|vvv) Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
--version (-V)        Display this application version.
--ansi                Force ANSI output.
--no-ansi             Disable ANSI output.
--no-interaction (-n) Do not ask any interactive question.
--root-dir            Force magento root dir. No auto detection
--skip-config         Do not load any custom config.

No panic. The command defines default values for every setting.

After the generation you should see a bash script like “bash var/cachebench/default/run.sh” which was
generated by the init command.

Run the shell script an see the your benchmark statistics.
Now you are able to compare different cache backends (change it in your app/etc/local.xml config).

See it in Action