I'm trying to narrow down some recent problems with our app
"gas" (http://www.guessasketch.com). For the last month or so, it has
been very stable. It's smoothly handled 10 requests per second during
busy times (which have been lasting sometimes for hours at a time).
Just in the last 15 hours the app is performing extremely poorly, and
not responding even under light load. In trying to debug, I'm
noticing particularly long memcache delays.
For example, here is a snippet of code that appears to have terrible
performance tonight (in this case, currentEventId is none):
logging.debug("Getting events for user" )
if currentEventId is None:
currentEventId = memcache.get("Event:currentEventId")
logging.debug("-----User %s is starting with event #%s-------"
% (self.name(), currentEventId))
And here is the associated debug entries from tonight's log where it
appears that it's taking almost a full second to do a single
memcache.get between two entries to the log:
#D 10-31 10:56PM 47.547
Getting events for user
#D 10-31 10:56PM 48.479
-----User is test starting with event #227-------
Also, I've noticed the memcache seeming to lose variables (like this
integer) several times an hour which is much more frequent than I've
experienced in the past month. I'm not sure if it's related, but I'm
also getting a very high percentage of application reloads where the
python main function has to start from scratch in the log.
I'd be very interested to hear if others are seeing similar problems
or if you have any other debugging suggestions for me to try to narrow
this issue down.
Thanks in advance for any help.
-Rob
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