[Monotone-devel] Re: severe performance penalty for mtn log individual-file?

[Bruce Stephens]

"Georg-W. Koltermann" <address@hidden> writes:

> is there a reason that "mtn log <individual-file>" has such a huge
> performance penalty?  It is a pain to use currently:
>
>     + time mtn log
>             4,93 real         4,15 user         0,16 sys
>     + time mtn log src/com/msc/sdm/application/SdmVersion.java
>           349,39 real       258,93 user         1,10 sys

I'm not sure.  There's a note here
<http://venge.net/monotone/wiki/PerformanceWork>, and it's been
discussed on the list before.

Intuitively it feels as though "mtn log file" should be a bit slower
than "mtn log", because it's doing "mtn log" and filtering the
messages.

The note on the wiki seems unconvincing since "mtn log" shows which
files have been changed in each revision.  OK, there's the issue of
file renaming, but (intuitively) surely that can't be *that* costly to
compute, especially since renames are so relatively rare?

[...]