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From: Derrick Stolee <stolee@gmail.com>
To: Jeff King <peff@peff.net>, Junio C Hamano <gitster@pobox.com>
Cc: Derrick Stolee via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, git@jeffhostetler.com,
	Derrick Stolee <derrickstolee@github.com>,
	Derrick Stolee <dstolee@microsoft.com>
Subject: Re: [PATCH v2 2/4] csum-file.h: increase hashfile buffer size
Date: Tue, 18 May 2021 10:44:17 -0400	[thread overview]
Message-ID: <6baf7f30-f183-b827-9495-96502ddf1756@gmail.com> (raw)
In-Reply-To: <YKNtxUtDXoWwaVrc@coredump.intra.peff.net>

On 5/18/2021 3:33 AM, Jeff King wrote:
> On Tue, May 18, 2021 at 06:54:57AM +0900, Junio C Hamano wrote:
> 
>> Just after the previous step justified its simplification of its
>> progress logic based on how small the buffer is, this step makes it
>> 16 times as big, which felt a tiny bit dishonest.  We probably
>> should say somewhere that 128k is still small enough that the
>> rewrite in the previous step is still valid ;-)
> 
> I noticed that, too. I'm not sure if still is small enough. For local
> pack writes, etc, it seems fine. But what about "index-pack --stdin"
> reading over the network?
> 
> Updating progress every 8k instead of every 128k seems like it would be
> more responsive, especially if the network is slow or jittery. I dunno.
> Maybe that is too small to care about for the modern world, but I just
> want to make sure we are not being blinded by the fast networks all of
> us presumably enjoy. :)

This is a good point.

If we combine the earlier suggestion of using the heap to store the
buffer, then we can change the buffer size based on the use case: we
can use 8k for data that might be streaming from a network, and 128k
for local-only data (index, commit-graph, multi-pack-index are all
probably safe).

For the case of NFS, I think we should probably assume that the NFS
server is not across a slow connection, which is a case we cannot
make for streaming a pack-file from a remote server.

Thanks,
-Stolee

  reply	other threads:[~2021-05-18 14:44 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-26 19:12 [PATCH 0/3] Convert index writes to use hashfile API Derrick Stolee via GitGitGadget
2021-03-26 19:12 ` [PATCH 1/3] csum-file: add nested_hashfile() Derrick Stolee via GitGitGadget
2021-03-26 19:12 ` [PATCH 2/3] read-cache: use hashfile instead of git_hash_ctx Derrick Stolee via GitGitGadget
2021-03-29 15:04   ` Derrick Stolee
2021-03-29 19:10     ` Derrick Stolee
2021-03-26 19:12 ` [PATCH 3/3] read-cache: delete unused hashing methods Derrick Stolee via GitGitGadget
2021-03-26 20:16 ` [PATCH 0/3] Convert index writes to use hashfile API Derrick Stolee
2021-05-17 12:24 ` [PATCH v2 0/4] " Derrick Stolee via GitGitGadget
2021-05-17 12:24   ` [PATCH v2 1/4] hashfile: use write_in_full() Derrick Stolee via GitGitGadget
2021-05-17 12:24   ` [PATCH v2 2/4] csum-file.h: increase hashfile buffer size Derrick Stolee via GitGitGadget
2021-05-17 21:54     ` Junio C Hamano
2021-05-18  7:33       ` Jeff King
2021-05-18 14:44         ` Derrick Stolee [this message]
2021-05-18  7:31     ` Jeff King
2021-05-18  7:42       ` Jeff King
2021-05-17 12:24   ` [PATCH v2 3/4] read-cache: use hashfile instead of git_hash_ctx Derrick Stolee via GitGitGadget
2021-05-17 22:13     ` Junio C Hamano
2021-05-18 14:16       ` Derrick Stolee
2021-05-17 12:24   ` [PATCH v2 4/4] read-cache: delete unused hashing methods Derrick Stolee via GitGitGadget
2021-05-18 18:32   ` [PATCH v3 0/4] Convert index writes to use hashfile API Derrick Stolee via GitGitGadget
2021-05-18 18:32     ` [PATCH v3 1/4] hashfile: use write_in_full() Derrick Stolee via GitGitGadget
2021-05-18 18:32     ` [PATCH v3 2/4] csum-file.h: increase hashfile buffer size Derrick Stolee via GitGitGadget
2021-11-25 12:14       ` t4216-log-bloom.sh fails with -v (but not --verbose-log) Ævar Arnfjörð Bjarmason
2021-11-26  4:08         ` Jeff King
2021-11-29 13:49           ` Derrick Stolee
2021-05-18 18:32     ` [PATCH v3 3/4] read-cache: use hashfile instead of git_hash_ctx Derrick Stolee via GitGitGadget
2021-05-18 18:32     ` [PATCH v3 4/4] read-cache: delete unused hashing methods Derrick Stolee via GitGitGadget

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