launchpad-dev team mailing list archive

[Robert Collins <robert.collins@xxxxxxxxxxxxx>]

It's almost certainly worth finding out. If we don't know we are at
best guessing.

possibilities include:
 - we didn't get pg properly on a ramdisk
 - we're doing a lot of random seeking
 - memory pressure is pushing stuff pagetests need out
 - windmill is slow
 - ...

blocktrace is probably your key friend here. That and/or systemtap.
Martin speaks highly of 'prof' but I've not had time to play with it
yet.

-Rob