Re^2: Wasting time thinking about wasted time

[erikharrison]

Generally working on a mounted filesystem for test one, then unmounting, then remounting, before running test two, eliminates cache issues for most OSes

I run these kind of benchmarks against my usb thumbdrive. Easy to mount, easy to unmount, and the drive's so fast that it tends to reduce or eliminate disk speed confusion in benchmarks

[bluto]

Generally working on a mounted filesystem for test one, then unmounting, then remounting, before running test two, eliminates cache issues for most OSes

When benchmarking in perl, I'm assuming that the first test case to run will incur the cold cache issues on it's very first run. After that every other test should run in the cache. It seems like you'd have to unmount every single test run -- not necessarily pleasant. It's Monday so I'm probably missing something...