Re: svn to git, N-squared?

[Linus Torvalds <torvalds@osdl.org>]

On Mon, 12 Jun 2006, Jon Smirl wrote:
> 
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 14525 jonsmirl  16   0  604m 391m 1904 S   24 38.7 916:53.39 git-svnimport
> 20947 jonsmirl  17   0     0    0    0 R    1  0.0   0:00.03 git-svnimport

Hard to tell, it's obviously got short-lived processes there too that it's 
not showing, but equally obviously that svnimport script itself is 
spending an alarming amount of CPU time. I don't think it should do that 
much processing, but since it's written in perl, I can't read it.

Are there any other directories that seem to be growing (eg some temp-file 
directory where the old files aren't cleaned away?). I can't imagine what 
else it could be doing in kernel space than simply some silly filesystem 
operation, but dang it all, Linux filesystems are usually very efficient 
indeed, unless we're talking huge directories (and if it's not the git 
object directory any more, it must be something else).

At least with the cvs importer I have _some_ clue what it's doing, since I 
wrote an earlier version myself (very different, but at least I know what 
the operations are). SVN has always just confused me, and I have no idea 
what svnimport does, so I think I'll have to defer to somebody who 
actually knows the code.

Smurf, have you looked at any larger repositories?

		Linus