Re: svn to git, N-squared?

On 6/12/06, Linus Torvalds [off-list ref] wrote:

On Mon, 12 Jun 2006, Jon Smirl wrote:

quoted

 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).

64 files in tmp.
But the SVN repository itself has 411,000 files in it. Split between
two directories.

Is there some pack equivalent for svn that I haven't found yet?

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

-- 
Jon Smirl
jonsmirl@gmail.com