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Re: Git performance on OS X

From
Linus Torvalds <torvalds@linux-foundation.org>
Date
Apr 20, 2008, 00:06 UTC
Message-ID
<alpine.LFD.1.10.0804191658430.2779@woody.linux-foundation.org>
In-Reply-To
<A07C1A99-084B-4DFC-90CB-B8BDAF7E72EF@sun.com>
On Sat, 19 Apr 2008, Roman Shaposhnik wrote:
Show 5 quoted lines
> > 
> > Is there any system-level profiler for OS X to get a clue where that cost
> > is, in case it's not the lstat() at all?
> 
> If it happens on Leopard, DTrace would be a perfect way to query the system:

Well, I'd really like to see a traditional _time_ profile, not system call counts.

The system call profile is trivial - it's generally going to be pretty similar under OS X and Linux (modulo library differences, but git doesn't really use any really complex libraries that would do system calls).

The problem we've had in the past is that Linux is simply an order of magnitude faster (sometimes more) at some operations than OS X is, so issues that show up on OS X don't even show up on Linux.

This was the case for doing lots of small "mmap()/munmap()" calls, for example, where we literally had a load where OS X was two orders of magnitude slower. We switched over to reading the files with "pread()" instead of mmap(), and that fixed that particular issue.

So a real system profile would be nice.
			Linus
Previous: Pieter de BieNext: Roman Shaposhnik
Message 33 of 39 in “Git performance on OS X”
  1. Pieter de BieApr 19, 2008
  2. Linus TorvaldsApr 19, 2008
  3. Linus TorvaldsApr 19, 2008
  4. Pieter de BieApr 19, 2008
  5. David KastrupApr 20, 2008
  6. Linus TorvaldsApr 19, 2008
  7. Pieter de BieApr 19, 2008
  8. Linus TorvaldsApr 19, 2008
  9. Junio C HamanoApr 20, 2008
  10. 01/02 implement a stat cacheLuciano Rocha, Apr 20, 2008
  11. 02/02 make use of the stat cacheLuciano Rocha, Apr 20, 2008
  12. Luciano RochaApr 20, 2008
  13. Linus TorvaldsApr 20, 2008
  14. Luciano RochaApr 20, 2008
  15. Linus TorvaldsApr 20, 2008
  16. Linus TorvaldsApr 20, 2008
  17. Dmitry PotapovApr 21, 2008
  18. Johan HerlandApr 21, 2008
  19. Junio C HamanoApr 21, 2008
  20. Linus TorvaldsApr 21, 2008
  21. Linus TorvaldsApr 21, 2008
  22. Junio C HamanoApr 21, 2008
  23. Linus TorvaldsApr 21, 2008
  24. Junio C HamanoApr 21, 2008
  25. David KastrupApr 21, 2008
  26. Jakub NarebskiApr 19, 2008
  27. Linus TorvaldsApr 19, 2008
  28. Linus TorvaldsApr 19, 2008
  29. Pieter de BieApr 19, 2008
  30. Linus TorvaldsApr 19, 2008
  31. Roman ShaposhnikApr 19, 2008
  32. Pieter de BieApr 19, 2008
  33. Linus TorvaldsApr 20, 2008
  34. Roman ShaposhnikApr 20, 2008
  35. Pieter de BieApr 19, 2008
  36. Linus TorvaldsApr 20, 2008
  37. Dmitry PotapovApr 20, 2008
  38. David KastrupApr 20, 2008
  39. Linus TorvaldsApr 19, 2008

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