Re: [viewvc-users] ViewVC caching svn blame output?

Johan Corveleyn wrote:
> Is ViewVC able to cache/buffer/store_in_DB the output of svn blame? Or
> does it just launch a new "svn blame" command (and parses the output)
> every time someone requests such an annotation view through the web
> interface?
> 
> We are having a lot of trouble with the performance of svn blame for
> large files (see this thread on the subversion users mailinglist:
> http://subversion.tigris.org/ds/viewMessage.do?dsForumId=1065&dsMessageId=2079688).
> If ViewVC would be able to store pre-calculated diffs/annotations, that
> would be a very useful workaround for this problem.
> 
> I've searched info on the viewvc homepage, faq, docs, mailinglist... but
> it's not clear to me whether viewVC does any such caching. Or have I
> overlooked something?

ViewVC has no server-side annotation cache, no.  It performs the blame
action every time.  (In some versions it literally runs 'svn blame' ... in
others is uses the svn_client_blame() APIs directly.)

Now, ViewVC is supposed to support interactions with browser caches, but a
quick glance at the code makes me think it might be deciding to invoke the
browser's cache only after performing the annotation work.  Seems kinda
pointless at that juncture, wouldn't you agree?

Of course, browser cache is only helpful for, you know, that one browser.  A
better situation would be for Subversion to actually store line change
information in the repository (like CVS does) so annotation calculation
didn't cost so much.

-- C-Mike

PS:  I've wanted for a long time now to deepen the integration of ViewVC and
MySQL so that such caching could occur (optionally), allowing ViewVC to make
up for some of the shortcomings of the version control systems it exposes.
But I've never had time to get any traction on the idea.  :-(

-- 
C. Michael Pilato <[email protected]>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand

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