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authorMatthew Ahrens <[email protected]>2019-06-12 13:13:09 -0700
committerBrian Behlendorf <[email protected]>2019-06-12 13:13:09 -0700
commitd9b4bf0665a0b1a7af2bbb34c60bca612956022d (patch)
treec90c5694edb1dd655ecbe46caac64c2be50229d7 /scripts
parentd9cd66e45f285356624d26eb92e10e2baf2738ee (diff)
fat zap should prefetch when iterating
When iterating over a ZAP object, we're almost always certain to iterate over the entire object. If there are multiple leaf blocks, we can realize a performance win by issuing reads for all the leaf blocks in parallel when the iteration begins. For example, if we have 10,000 snapshots, "zfs destroy -nv pool/fs@1%9999" can take 30 minutes when the cache is cold. This change provides a >3x performance improvement, by issuing the reads for all ~64 blocks of each ZAP object in parallel. Reviewed-by: Andreas Dilger <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Matthew Ahrens <[email protected]> External-issue: DLPX-58347 Closes #8862
Diffstat (limited to 'scripts')
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