On 2010-Oct-24 18:05:05 +0200, Jean-Francois Dockes <j...@dockes.org> wrote: >It appears that modifying dump to use a shared cache in a very simple way >(move the control structures to the shared segment and perform simple locking) >yields substantial speed increases.
Indeed. That's better than I expected. >Would someone be interested in reviewing the patch and/or perform >more tests ? I've mostly convered to ZFS but still have UFS root (which is basically a full base install without /var but including /usr/src - 94k inodes and 1.7GB). I've run both the 8-stable ("stable") and patched ("jfd") dump alternately 4 times with 50/250MB cache with the following results: x stable + jfd +------------------------------------------------------------+ | +| | +| | x +| |x xx +| ||AM A| +------------------------------------------------------------+ N Min Max Median Avg Stddev x 4 9413 9673 9568 9555.5 107.12143 + 4 15359 15359 15359 15359 0 Difference at 95.0% confidence 5803.5 +/- 131.063 60.7347% +/- 1.3716% (Student's t, pooled s = 75.7463) -- Peter Jeremy
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