Re: cloning the kernel - why long time in "Resolving 313037 deltas"

On Tuesday December 19th 2006 at 02:26 Shawn Pearce wrote:

[git-index-pack limping along on Mac OS X]

ActivityMonitor is showing that I'm spending 94% CPU in the kernel,
which is just insane.  Clearly Mac OS X's kernel cannot gracefully
handle what git-index-pack is currently doing.

A bit off topic but it might help people diagnose and test different
strategies.

The equivalent of "oprofile" on Mac OS X is a tool called "shark" from
Apple itself. It's very nice actually.

It's in the CHUD (Computer Hardware Understanding
Developer Tools) package. More information at
http://developer.apple.com/tools/performance and it is free as in beer.
;-)

Also the OpenSSL version on Mac OS X is rather old and compiled as
32-bit application. OpenSSL is one of the few userspace packages that
_really_ benefits tremendously from being compiled as 64-bit. It might
explain a bit of the enormous performance difference in this case. But
only profiling (perhaps with the help of "shark") will tell of course...

The kernel git repository isn't very handy on the Mac HFS+ filesystem,
due to it being case-insensitive, but I suppose it won't influence
git-index-pack.
--