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From: Junio C Hamano <gitster@pobox.com>
To: Jonathan Tan <jonathantanmy@google.com>
Cc: git@vger.kernel.org, peff@peff.net, steadmon@google.com
Subject: Re: [PATCH 7/7] index-pack: make quantum of work smaller
Date: Mon, 24 Aug 2020 14:19:35 -0700	[thread overview]
Message-ID: <xmqqk0xn3fo8.fsf@gitster.c.googlers.com> (raw)
In-Reply-To: <3e69f41f19535fa2c04fae6adc78bcc4f052d523.1598296530.git.jonathantanmy@google.com> (Jonathan Tan's message of "Mon, 24 Aug 2020 12:16:38 -0700")

Jonathan Tan <jonathantanmy@google.com> writes:

> Currently, when index-pack resolves deltas, it does not split up delta
> trees into threads: each delta base root (an object that is not a
> REF_DELTA or OFS_DELTA) can go into its own thread, but all deltas on
> that root (direct or indirect) are processed in the same thread.
>
> This is a problem when a repository contains a large text file (thus,
> delta-able) that is modified many times - delta resolution time during
> fetching is dominated by processing the deltas corresponding to that
> text file.

We favor wide and shallow delta trees for both reduced storage
footprint and lower runtime overhead, so optimizing the index-pack
for that use case makes a lot of sense.


  reply	other threads:[~2020-08-24 21:19 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-24 19:16 [PATCH 0/7] Better threaded delta resolution in index-pack (another try) Jonathan Tan
2020-08-24 19:16 ` [PATCH 1/7] Documentation: deltaBaseCacheLimit is per-thread Jonathan Tan
2020-08-24 19:16 ` [PATCH] fetch-pack: in partial clone, pass --promisor Jonathan Tan
2020-08-24 19:36   ` Jonathan Tan
2020-08-24 19:16 ` [PATCH 2/7] index-pack: remove redundant parameter Jonathan Tan
2020-08-24 21:01   ` Junio C Hamano
2020-08-24 19:16 ` [PATCH 3/7] index-pack: unify threaded and unthreaded code Jonathan Tan
2020-08-24 21:11   ` Junio C Hamano
2020-08-24 19:16 ` [PATCH 4/7] index-pack: remove redundant child field Jonathan Tan
2020-08-24 19:16 ` [PATCH 5/7] index-pack: calculate {ref,ofs}_{first,last} early Jonathan Tan
2020-08-24 19:16 ` [PATCH 6/7] index-pack: make resolve_delta() assume base data Jonathan Tan
2020-08-24 19:16 ` [PATCH 7/7] index-pack: make quantum of work smaller Jonathan Tan
2020-08-24 21:19   ` Junio C Hamano [this message]
2020-08-24 20:47 ` [PATCH 0/7] Better threaded delta resolution in index-pack (another try) Junio C Hamano
2020-08-24 21:27 ` [PATCH] fixup! index-pack: make quantum of work smaller Jonathan Tan
2020-08-24 22:08 ` [PATCH 0/7] Better threaded delta resolution in index-pack (another try) Jeff King
2020-08-25 18:11   ` Jonathan Tan
2020-08-25 21:18     ` Jeff King
2020-08-25 21:46       ` Jeff King
2020-09-08 19:48 ` [PATCH v2 " Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 1/7] Documentation: deltaBaseCacheLimit is per-thread Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 2/7] index-pack: remove redundant parameter Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 3/7] index-pack: unify threaded and unthreaded code Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 4/7] index-pack: remove redundant child field Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 5/7] index-pack: calculate {ref,ofs}_{first,last} early Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 6/7] index-pack: make resolve_delta() assume base data Jonathan Tan
2020-09-08 19:48   ` [PATCH v2 7/7] index-pack: make quantum of work smaller Jonathan Tan
2020-09-08 22:53   ` [PATCH v2 0/7] Better threaded delta resolution in index-pack (another try) Junio C Hamano

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