I have a blog app which I think is created properly, but I'm getting a
strange behavior from time to time for blog RSS posts. App is based on
Django 1.0 (zip import) + GAE Helper. For most of the time (but not
only there) I see the strange behavior when someone gets me RSS feed.
I've started a random profiling of the code and here is what i got:
11-08 10:40AM 46.407 /blog/rss/kategoria/django/ 200 2465ms
19793mcycles 8kb
Profile data:
191781 function calls (181229 primitive calls) in 2.404 CPU
seconds
Ordered by: internal time
List reduced from 687 to 25 due to restriction <25>
ncalls tottime percall cumtime percall
filename:lineno(function)
128 1.716 0.013 1.933 0.015
{google3.apphosting.runtime._apphosting_runtime___python__apiproxy.Wait}
4769/128 0.082 0.000 0.192 0.001
{google3.net.proto._net_proto___parse__python.MergeFromString}
372 0.033 0.000 0.230 0.001 /base/python_lib/
versions/1/google/appengine/api/datastore.py:502(_FromPb)
4769/128 0.021 0.000 0.208 0.002 /base/python_lib/
versions/1/google/net/proto/ProtocolBuffer.py:61(MergeFromString)
128 0.021 0.000 0.021 0.000
{google3.apphosting.runtime._apphosting_runtime___python__apiproxy.MakeCall}
1360 0.015 0.000 0.038 0.000 /base/python_lib/
versions/1/google/appengine/api/datastore_types.py:
1299(FromPropertyPb)
There are two things I don't understand:
1. Why 128 Wait calls when I have in my pathway only three queries,
shown below?
tag = Tag.get_by_key_name(bits[0])
return Entry.all().filter('tags =', tag.name).order('-
pub_date').fetch(10)
current_site = cls.all().filter('id =', sid).get()
There is no put() in the path, just getting at max 12 entities.
2. As you can see most of the time was not spend in my app (all Google
code), so why I see warnings in logs and dashboard to get the code
optimized, when I cannot do anything about it?
I've looked into to feed generator code from Django and i do not see
anything strange here. When i add memchaching to the blog RSS, the
response time drops to 20ms. By the way generating a standard blog
page, which has more data: also month list, newest comments list, top
tags list etc. takes normally about 100-150ms without caching.
Any ideas?
--
Rafał Jońca
Blog: http://www.rafaljonca.org/
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