Re: svn to git, N-squared?

>
>
> 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
>