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name Punditsdkoslkdosdkoskdo

Solaris 10: Drop disk cache? (to benchmark app)

Is there a command to drop the ZFS and UFS disk caches? (Preferably just one folder hierarchy.)

I'm trying to tuning the performance settings of an application that read/writes data from a large number of files. Mostly read.

In actual use, the app will only run once in a while so the files in question will not likely be cached.

However, since I am testing multiple times in a row, Solaris is trying to be helpful by keeping this files in memory.

Between benchmark runs, can I instruct Solaris to drop anything under /path/to/data from it's caches?

Thank you

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    • What are you trying to achieve? Are you seeing performance problems and want to see if the cache in memory is the culprit?

There is no way to selectively drop the cache per directory.

For a whole file system, running lockfs -f /directory will flush all of this directory file system cached data on disk.

If for some reason, this doesn't have the wanted effect, a more radical way is to unmount/remount the filesystem (UFS) and export/import the pool (ZFS).

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