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authorLibravatar Dmitry Ivankov <divanorama@gmail.com>2011-08-21 01:04:11 +0600
committerLibravatar Junio C Hamano <gitster@pobox.com>2011-08-22 11:57:06 -0700
commit94c3b48247b25773d9c0d7de892cb75cb06708bb (patch)
treeb9a4806ee8bf3b0b061f3d6bb486af6277e50e49 /t/t5100/msg0016
parentfilter-branch: Export variable `workdir' for --commit-filter (diff)
downloadtgif-94c3b48247b25773d9c0d7de892cb75cb06708bb.tar.xz
fast-import: count and report # of calls to diff_delta in stats
It's an interesting number, how often do we try to deltify each type of objects and how often do we succeed. So do add it to stats. Success doesn't mean much gain in pack size though. As we allow delta to be as big as (data.len - 20). And delta close to data.len gains nothing compared to no delta at all even after zlib compression (delta is pretty much the same as data, just with few modifications). We should try to make less attempts that result in huge deltas as these consume more cpu than trivial small deltas. Either by choosing a better delta base or reducing delta size upper bound or doing less delta attempts at all. Currently, delta base for blobs is a waste literally. Each blob delta base is chosen as a previously stored blob. Disabling deltas for blobs doesn't increase pack size and reduce import time, or at least doesn't increase time for all fast-import streams I've tried. Signed-off-by: Dmitry Ivankov <divanorama@gmail.com> Acked-by: David Barr <davidbarr@google.com> Acked-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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