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- runcached (Run Cached)
- ------------------------------------------------------------------------------
- Execute commands while caching their output for subsequent calls.
- Command output will be cached for <cacheperiod> seconds and "replayed" for
- any subsequent calls. Original exit status will also be emulated.
- After cacheperiod has expired, command will be re-executed and a new result
- will be cached.
- Caching depends on command and arguments executed and the
- path of the runcached executable. Cache results are stored in /tmp
- You can use runcached to run resource-expensive commands multiple times,
- parsing different parts of its output each time. Those commands will be
- run only once for each cacheperiod.
- Implementation is provided in 3 languages, python, C, BASH.
- Usage:
- ======
- Python:
- runcached.py [-c cacheperiod] <command to execute with args>
- C:
- runcached [-c cacheperiod] <command to execute with args>
- Bash
- runcached.sh <command to execute with args>
- Example:
- ========
- 1) Run the date command. Produce a new "date" every 5 seconds.
- runcached.py -c 5 date
- 2) Query multiple parameters of mysql without re-running the query, and making
- sure all of them correspond to the same time.
- UserParameter=mysql.globalstatus[*],/usr/local/bin/runcached.py -c 20 /usr/bin/mysql -ANe \"show global status\"|egrep '$1\b'|awk '{print $ 2}'
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