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authorLibravatar Neeraj Singh <neerajsi@ntdev.microsoft.com>2021-02-18 02:48:26 +0000
committerLibravatar Junio C Hamano <gitster@pobox.com>2021-02-24 13:40:30 -0800
commitf279894d283101e8e7427347a5469a8731820872 (patch)
tree5213d76e69271dba67c9e173b3f22a8421c1585a /t/t5515/refs.br-unconfig_config-glob
parentThe tenth batch (diff)
downloadtgif-f279894d283101e8e7427347a5469a8731820872.tar.xz
read-cache: make the index write buffer size 128K
Writing an index 8K at a time invokes the OS filesystem and caching code very frequently, introducing noticeable overhead while writing large indexes. When experimenting with different write buffer sizes on Windows writing the Windows OS repo index (260MB), most of the benefit came by bumping the index write buffer size to 64K. I picked 128K to ensure that we're past the knee of the curve. With this change, the time under do_write_index for an index with 3M files goes from ~1.02s to ~0.72s. Signed-off-by: Neeraj Singh <neerajsi@ntdev.microsoft.com> Acked-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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