[PATCH v4 5/6] p5310-pack-bitmaps.sh: enable `pack.writeReverseIndex`

["Abhradeep Chakraborty via GitGitGadget" <gitgitgadget@gmail.com>]

From: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>

Enable `pack.writeReverseIndex` before running pack-bitmap related
performance tests.

The performance difference with `pack.writeReverseIndex` enabled and
with disabled are given below -

With `pack.writeReverseIndex`
-------------------------------

Test                                                 this tree
-------------------------------------------------------------------------
5310.3: repack to disk                                 296.55(256.53+14.52)
5310.4: simulated clone                                15.64(8.88+1.39)
5310.5: simulated fetch                                1.65(2.75+0.20)
5310.6: pack to file (bitmap)                          48.71(30.20+7.58)
5310.7: rev-list (commits)                             0.61(0.41+0.08)
5310.8: rev-list (objects)                             4.38(4.26+0.09)
5310.9: rev-list with tag negated via --not            0.07(0.02+0.04)
         --all (objects)
5310.10: rev-list with negative tag (objects)          0.05(0.01+0.03)
5310.11: rev-list count with blob:none                 0.08(0.03+0.04)
5310.12: rev-list count with blob:limit=1k             7.29(6.92+0.30)
5310.13: rev-list count with tree:0                    0.08(0.03+0.04)
5310.14: simulated partial clone                       9.45(8.12+0.41)
5310.16: clone (partial bitmap)                        17.02(10.61+2.67)
5310.17: pack to file (partial bitmap)                 51.91(28.57+7.48)
5310.18: rev-list with tree filter (partial bitmap)    1.00(0.22+0.24)

Without `pack.writeReverseIndex`:
-----------------------------

Test                                                  this tree
------------------------------------------------------------------------
5310.3: repack to disk                              293.80(251.30+14.30)
5310.4: simulated clone                             12.50(5.15+1.36)
5310.5: simulated fetch                             1.83(2.90+0.23)
5310.6: pack to file (bitmap)                       39.70(20.25+7.14)
5310.7: rev-list (commits)                          1.00(0.60+0.13)
5310.8: rev-list (objects)                          4.11(4.00+0.10)
5310.9: rev-list with tag negated via --not         0.07(0.02+0.05)
         --all (objects)
5310.10: rev-list with negative tag (objects)       0.23(0.16+0.06)
5310.11: rev-list count with blob:none              0.27(0.18+0.08)
5310.12: rev-list count with blob:limit=1k          6.41(5.98+0.41)
5310.13: rev-list count with tree:0                 0.26(0.18+0.07)
5310.14: simulated partial clone                    4.34(3.29+0.37)
5310.16: clone (partial bitmap)                     21.48(15.12+2.42)
5310.17: pack to file (partial bitmap)              47.35(37.80+4.84)
5310.18: rev-list with tree filter (partial bitmap) 0.73(0.07+0.21)

Signed-off-by: Abhradeep Chakraborty <chakrabortyabhradeep79@gmail.com>
---
 t/perf/p5310-pack-bitmaps.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/t/perf/p5310-pack-bitmaps.sh b/t/perf/p5310-pack-bitmaps.sh
index 7ad4f237bc3..6e8abcd5b21 100755
--- a/t/perf/p5310-pack-bitmaps.sh
+++ b/t/perf/p5310-pack-bitmaps.sh
@@ -13,7 +13,8 @@ test_perf_large_repo
 # We intentionally use the deprecated pack.writebitmaps
 # config so that we can test against older versions of git.
 test_expect_success 'setup bitmap config' '
-	git config pack.writebitmaps true
+	git config pack.writebitmaps true &&
+	git config pack.writeReverseIndex true
 '
 
 # we need to create the tag up front such that it is covered by the repack and
-- 
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