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Subject: bug#78499: tramp-accept-process-output busy-waits
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tramp-accept-process-output should wait for something to actually happen
to the process from which we're trying to accept output, not just return
immediately after specifying a zero timeout and rely on the caller
to poll.

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To: Daniel Colascione <dancol@HIDDEN>
Subject: bug#78499: Acknowledgement (tramp-accept-process-output busy-waits)
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Subject: bug#78499: tramp-accept-process-output busy-waits
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Date: Wed, 21 May 2025 09:47:14 +0200
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Daniel Colascione <dancol@HIDDEN> writes:

Hi Daniel,

> tramp-accept-process-output should wait for something to actually happen
> to the process from which we're trying to accept output, not just return
> immediately after specifying a zero timeout and rely on the caller
> to poll.

tramp-accept-process-output has seen several implementation iterations
ove the years. I'm happy, that it looks stable now.

Could you please show a problem with the current implementation, which
needs to be fixed?

Best regards, Michael.

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Subject: bug#78499: tramp-accept-process-output busy-waits
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On May 21, 2025 3:47:14 AM EDT, Michael Albinus <michael=2Ealbinus@gmx=2Ed=
e> wrote:
>Daniel Colascione <dancol@dancol=2Eorg> writes:
>
>Hi Daniel,
>
>> tramp-accept-process-output should wait for something to actually happe=
n
>> to the process from which we're trying to accept output, not just retur=
n
>> immediately after specifying a zero timeout and rely on the caller
>> to poll=2E
>
>tramp-accept-process-output has seen several implementation iterations
>ove the years=2E I'm happy, that it looks stable now=2E
>
>Could you please show a problem with the current implementation, which
>needs to be fixed?
=2E
100% CPU use while we're waiting to receive bytes from the peer is a prior=
i a problem that needs to be fixed=2E Good software doesn't busy wait=2E We=
 have a perfectly good mechanism for waiting for something to happen with t=
imeouts and we shouldn't avoid them on account of years of accumulated chan=
ges or compatibility with ancient and irrelevant bugs=2E=20

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Daniel Colascione <dancol@HIDDEN> writes:

Hi Daniel,

>>tramp-accept-process-output has seen several implementation iterations
>>ove the years. I'm happy, that it looks stable now.
>>
>>Could you please show a problem with the current implementation, which
>>needs to be fixed?
> .
> 100% CPU use while we're waiting to receive bytes from the peer is a
> priori a problem that needs to be fixed. Good software doesn't busy
> wait. We have a perfectly good mechanism for waiting for something to
> happen with timeouts and we shouldn't avoid them on account of years
> of accumulated changes or compatibility with ancient and irrelevant
> bugs.

"A priori" isn't a bug recipe. Pls show me a recipe indicating a
misbehavior, which needs to be fixed.

Best regards, Michael.

Last modified: Thu, 22 May 2025 11:30:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.