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Re: [PATCHv3 02/11] run-command: report failure for degraded output just once

From
Johannes Sixt <j6t@kdbg.org>
Date
Nov 4, 2015, 20:36 UTC
Message-ID
<563A6C3D.2050805@kdbg.org>
In-Reply-To
<CAGZ79kaiRKHd2RS9eNeZt_VZqqBF0HS0D=x1HbOTPXYOphu8pg@mail.gmail.com>
Am 04.11.2015 um 21:14 schrieb Stefan Beller:
Show 14 quoted lines
> On Wed, Nov 4, 2015 at 10:14 AM, Junio C Hamano <gitster@pobox.com> wrote:
>> Imagine that we are running two things A and B at the same time.  We
>> ask poll(2) and it says both A and B have some data ready to be
>> read, and we try to read from A.  strbuf_read_once() would try to
>> read up to 8K, relying on the fact that you earlier set the IO to be
>> nonblock.  It will get stuck reading from A without allowing output
>> from B to drain.  B's write may get stuck because we are not reading
>> from it, and would cause B to stop making progress.
>>
>> What if the other sides of the connection from A and B are talking
>> with each other,
>
> I am not sure if we want to allow this ever. How would that work with
> jobs==1? How do we guarantee to have A and B running at the same time?

I think that a scenario where A and B are communicating is rather far-fetched. We are talking about parallelizing independent tasks. I would not worry.

-- Hannes
Previous: Stefan BellerNext: Junio C Hamano
Message 6 of 34 in “[PATCHv3 00/11] Expose the submodule parallelism to the user”
  1. Stefan BellerNov 4, 2015
  2. 01/11 run_processes_parallel: delimit intermixed task outputStefan Beller, Nov 4, 2015
  3. 02/11 run-command: report failure for degraded output just onceStefan Beller, Nov 4, 2015
  4. Junio C HamanoNov 4, 2015
  5. Stefan BellerNov 4, 2015
  6. Johannes SixtNov 4, 2015
  7. Junio C HamanoNov 4, 2015
  8. Jeff KingNov 4, 2015
  9. Junio C HamanoNov 5, 2015
  10. Jeff KingNov 5, 2015
  11. Junio C HamanoNov 5, 2015
  12. Stefan BellerNov 5, 2015
  13. Junio C HamanoNov 4, 2015
  14. Stefan BellerNov 4, 2015
  15. Junio C HamanoNov 4, 2015
  16. Stefan BellerNov 4, 2015
  17. 03/11 run-command: omit setting file descriptors to non blocking in WindowsStefan Beller, Nov 4, 2015
  18. 04/11 submodule-config: keep update strategy aroundStefan Beller, Nov 4, 2015
  19. 05/11 submodule-config: drop check against NULLStefan Beller, Nov 4, 2015
  20. 06/11 submodule-config: remove name_and_item_from_varStefan Beller, Nov 4, 2015
  21. 07/11 submodule-config: introduce parse_generic_submodule_configStefan Beller, Nov 4, 2015
  22. 08/11 fetching submodules: respect `submodule.jobs` config optionStefan Beller, Nov 4, 2015
  23. Jens LehmannNov 10, 2015
  24. Stefan BellerNov 10, 2015
  25. Jens LehmannNov 11, 2015
  26. Stefan BellerNov 11, 2015
  27. Jens LehmannNov 13, 2015
  28. Stefan BellerNov 13, 2015
  29. 09/11 git submodule update: have a dedicated helper for cloningStefan Beller, Nov 4, 2015
  30. 10/11 submodule update: expose parallelism to the userStefan Beller, Nov 4, 2015
  31. 11/11 clone: allow an explicit argument for parallel submodule clonesStefan Beller, Nov 4, 2015
  32. Junio C HamanoNov 4, 2015
  33. Stefan BellerNov 4, 2015
  34. Junio C HamanoNov 4, 2015

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