James Bottomley wrote:
On Tue, 2005-08-30 at 10:56 +1000, Nick Piggin wrote:Gang lookup is mainly used on IO paths but also on truncate, which is a reasonably fast path on some workloads (James, this is my suggestion for what you should test - truncate).Actually, I don't think I can test this. In order to show a difference between index 5 and index 6 on 32 bit, I'd have to deal with files > 4GB in size. My 32 bit machines are the voyagers and only have 4GB discs. The machine with all the huge discs, is, naturally, ia64.
Sorry, I meant for testing your gang lookup speedups. For testing regular lookups, yeah that's more difficult. For a microbenchmark you can use sparse files, which can be a good trick for testing pagecache performance without the IO. NickSend instant messages to your online friends http://au.messenger.yahoo.com -
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