On 08/14/2013 12:43 PM, Theodore Ts'o wrote: > Thanks dave for doing this comparison. Is there any chance you can > check whether lockstats shows anything interesting? > >> Test case is this: >> >> >> https://github.com/antonblanchard/will-it-scale/blob/master/tests/page_fault3.c > > One interesting thing about the test case. It looks like the first > time through the while loop, the file will need to be extended (since > it is a new tempfile). But subsequent times through the list the > blocks for the file will already be allocated. If the file is > prezero'ed ahead of time, so we're only measuring the cost of the > write page fault, and we take block allocation out of the comparison, > do we see the same scalability curve?
Would a plain old fallocate() do the trick, or does it actually need zeros written to it? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
