Chuck Anderson wrote:
Won't there be performance problems with a TurboGears-based wiki? I
thought MirrorManager was having issues with TG performance and had to
enable form-data caching to get acceptable performance at the cost of
possibly stale data. I don't know the details behind it, but that was
the reason I was given for why when you edit forms in MM it sometimes
returns old pre-edit field values.
We might have performance issues but I'm confident they'll be different
performance issues than we're currently experiencing ;-)
The issues we're running into with moin right now are largely caused by
Moin's philosophy of having to run off the filesystem, not a db. This
means 1) we're unable to spread the load among multiple different app
servers so we are constrained to a single server's memory and CPU
resources, 2) it makes multiple views of data much harder than it needs
to (in the subscription list case, Moin has to walk the filesystem,
finding each user's prefs file, parsing it for a watchlist, if the
watchlist exists, checking if the page and page categories are in that
watchlist, and finally being able to send the notification. With a db,
we'd have a separate table for the watchlist and have indexes for the
userid and the pagename. Searching for a page wouldn't have to open a
file for every single one of our users, instead it would access a single
table and pull out the users which were in the watchlist.)
With MirrorManager I know we've had memory and db query speed issues
trying to serve the mirrorlist directly from the TG app. I wasn't aware
that mirrormanager was having trouble keeping up with it's management
functionality, Matt is that still true or is caching a leftover from
when the two functions were combined? I don't think the wiki is as busy
as mirrormanager's mirrorlist serving but it would definitely be busier
than any of our other apps. We'd have to take a close look at this to
see where we're bottlenecking in currently deployed code before deciding
if we want to migrate.
-Toshio
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