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...
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