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Re: [PATCH v2 3/3] grep: disable threading in all but worktree case

From
Jeff King <peff@peff.net>
Date
Dec 7, 2011, 18:10 UTC
Message-ID
<20111207181056.GA6124@sigill.intra.peff.net>
In-Reply-To
<4EDF99BA.3040006@lsrfire.ath.cx>
On Wed, Dec 07, 2011 at 05:52:10PM +0100, René Scharfe wrote:
Show 10 quoted lines
> > As a user, I would do:
> > 
> >   git grep --threads=1 ...
> > 
> > if I wanted a single-threaded process. Instead, we actually spawn a
> > sub-thread and do all of the locking, which has a measurable cost:
> 
> Yes, the difference is measurable, and that's exactly how I like it to
> be. :)  A user can turn off threading with --threads=0 or (more
> intuitively) --no-threads.  And we can quantify the overhead.

That seems acceptable to me if --threads is for speed-testing, but a horrible interface if it is meant for end users who just want git to be fast.

-Peff
Previous: René ScharfeNext: Thomas Rast
Message 20 of 35 in “grep multithreading and scaling”
  1. 0/3 grep multithreading and scalingThomas Rast, Dec 2, 2011
  2. 1/3 grep: load funcname patterns for -WThomas Rast, Dec 2, 2011
  3. 2/3 grep: enable threading with -p and -W using lazy attribute lookupThomas Rast, Dec 2, 2011
  4. 3/3 grep: disable threading in all but worktree caseThomas Rast, Dec 2, 2011
  5. René ScharfeDec 2, 2011
  6. Thomas RastDec 5, 2011
  7. René ScharfeDec 6, 2011
  8. 4/2 grep: turn off threading for non-worktreeRené Scharfe, Dec 6, 2011
  9. Jeff KingDec 7, 2011
  10. René ScharfeDec 7, 2011
  11. Jeff KingDec 7, 2011
  12. J. Bruce FieldsDec 7, 2011
  13. Jeff KingDec 7, 2011
  14. Thomas RastDec 7, 2011
  15. René ScharfeDec 7, 2011
  16. Pete WyckoffDec 10, 2011
  17. René ScharfeDec 12, 2011
  18. Jeff KingDec 7, 2011
  19. René ScharfeDec 7, 2011
  20. Jeff KingDec 7, 2011
  21. Thomas RastDec 7, 2011
  22. René ScharfeDec 7, 2011
  23. Ævar Arnfjörð BjarmasonDec 23, 2011
  24. Thomas RastDec 23, 2011
  25. Ævar Arnfjörð BjarmasonDec 24, 2011
  26. Jeff KingDec 24, 2011
  27. Nguyen Thai Ngoc DuyDec 24, 2011
  28. Nguyen Thai Ngoc DuyDec 24, 2011
  29. Jeff KingDec 24, 2011
  30. Nguyen Thai Ngoc DuyDec 25, 2011
  31. Jeff KingDec 2, 2011
  32. Thomas RastDec 5, 2011
  33. Thomas RastDec 5, 2011
  34. Jeff KingDec 6, 2011
  35. Eric HermanDec 2, 2011

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