From: Erik Faye-Lund <kusmabite@googlemail.com>
To: Johannes Sixt <j6t@kdbg.org>
Cc: msysgit@googlegroups.com, Git Mailing List <git@vger.kernel.org>
Subject: Re: [msysGit] upload-pack timing issue on windows?
Date: Sat, 6 Feb 2010 13:01:50 +0100 [thread overview]
Message-ID: <40aa078e1002060401r1dec3c2ate3ddd4f5f5db1e0c@mail.gmail.com> (raw)
In-Reply-To: <201002061106.04305.j6t@kdbg.org>
On Sat, Feb 6, 2010 at 11:06 AM, Johannes Sixt <j6t@kdbg.org> wrote:
> On Samstag, 6. Februar 2010, Erik Faye-Lund wrote:
>> As some of you might know, I've been working on porting git-daemon to
>> Windows for quite some time now. As it stands now, there's really only
>> one known issue that is blocking on my end here:
>>
>> Something weird happens *sometimes* when upload-pack is exiting,
>> leading to a client dying with a "fatal: read error: Invalid
>> argument\nfatal: early EOF"-error. If I place a sleep(1) at some place
>> after exiting the while(1)-loop in create_pack() in upload-pack.c, the
>> symptom goes away. create_pack() contains some async-code, but this
>> doesn't seem to be triggered in my minimal case at all. I've tried
>> flushing stdout and stderr explicitly, no luck.
>
> I've observed timing related issues in upload-pack as well, but only in the
> case where the die() is called from the async thread. This is the reason why
> t5530 does not pass.
>
> But your case seems to be different - i.e. there is no die() involved. Sorry,
> can't help more...
>
Yeah, it's probably not the same case, but I certainly do find it
interesting that we seemingly have two separate timing-related around
here somewhere...
> Perhaps use Procmon to analyse differences among the different successful and
> failing cases.
>
I'm not entirely sure what to look for, but I do see that there's
difference. There's about 3.5k lines of logging from git.exe,
git-daemon.exe and git-upload-pack.exe for the failure case versus
2.5k for the successful case. And the last sequence of TCP Send in the
success case is a send of 8 bytes, followed by a send of 212 bytes,
followed again by a send of 1 byte. In the failure case, there's only
a send of 8 bytes in the end. This sequence is reported as sent by
git-daemon.exe. In fact, all TCP actions are reported from
git-daemon.exe, and apart from the last sequence the lengths are
reported as identical.
> Try hacking fetch-pack so that it does not announce side-band(-64k). Perhaps
> it makes a difference.
>
This didn't make any difference. I removed "side-band" and
"side-band-64k" from capabilities in send_ref() in upload-pack.c, as
well as the "if (server_supports("side-band<...>"-lines in
builtin-fetch-pack.c.
While I was at it, I also tried to disable all other capabilities; no luck.
However, I have tracked down a bit of what goes on in the client.
There's a call to read_in_full, called from pack-write.c, line 246
that fails in the failure-case, but not in the success-case. This is
where the client expects "pack\tSHA-1" or "keep\tSHA-1". There "fatal:
early EOF"-messages seems to originate from index-pack.c, line 197.
This is the first line of code in parse_pack_header(), it's also
AFAICT the first call-site for any read(0, <...>) (though fill()).
--
Erik "kusma" Faye-Lund
next prev parent reply other threads:[~2010-02-06 12:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-05 23:51 upload-pack timing issue on windows? Erik Faye-Lund
2010-02-06 10:06 ` Johannes Sixt
2010-02-06 12:01 ` Erik Faye-Lund [this message]
2010-02-06 22:18 ` [msysGit] " Johannes Sixt
2010-02-08 11:18 ` Erik Faye-Lund
2010-02-10 20:41 ` Jay Soffian
2010-08-22 23:27 ` Erik Faye-Lund
2010-08-24 19:24 ` Johannes Sixt
2010-08-25 17:40 ` Erik Faye-Lund
2010-08-25 20:53 ` Johannes Sixt
2010-08-25 20:57 ` Erik Faye-Lund
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=40aa078e1002060401r1dec3c2ate3ddd4f5f5db1e0c@mail.gmail.com \
--to=kusmabite@googlemail.com \
--cc=git@vger.kernel.org \
--cc=j6t@kdbg.org \
--cc=kusmabite@gmail.com \
--cc=msysgit@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).