Re: RFH: spawning pager takes long time when when unconnected from network

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On Tue, Feb 10, 2009 at 2:24 AM, Johannes Schindelin
<Johannes.Schindelin@xxxxxx> wrote:
> Hi,
>
> On Tue, 10 Feb 2009, Eric Raible wrote:
>
>> Johannes Sixt <j.sixt <at> viscovery.net> writes:
>>
>> > Do you have a directory in your PATH that points to a disconnected network
>> > drive? Do you use the default pager settings, or did you customize the pager?
>>
>> All components in my path are local.
>
> Could you run it with GIT_TRACE=<file>?
>
> Ciao,
> Dscho
>

The first thing I tried was to set GIT_TRACE=1, and it doesn't give much:
trace: built-in: git 'diff' 'ss' '--name-only'
trace: run_command: 'sh' '-c' 'less'

The long pause in question begins after the above output is produced
but before the list of files is shown.  The output is identical when setting
GIT_TRACE to a file.

When I pipe the git diff to less or set core.pager="",
then obviously it doesn't call run_command.

Since I can't really reproduce this in the debugger
(because the "bug" is an intermittent delay of 3-10 seconds), I tried
littering the code with trace_printf's.  Didn't really help, partially because
after the dup2 (which is part of spawning the pager process)
they don't on stdout any longer.  Now that I know about setting
GIT_TRACE to a file perhaps this is worth trying again.

But once it started to look like the delay was in the xdiff machinery,
I figured I was chasing a side-effect, and that the real problem was
some interaction between the two processes.  That's when I sent
my first RFH  to the list.

- Eric
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