I should have also mentioned that the combined cache hit of all tiers of our system is 93%.
50% Edgecache 12% Local Instance Memory 8% MemCache 23% DataStore With edge Cache off The numbers look pretty close to the same 14% Local Instance Memory 10% MemCache 69% DataStore Turning off Local instance memory has a NEGATIVE effect on Memcache because of data turn over being high because of the limited size of the Memcache. From: [email protected] [mailto:[email protected]] On Behalf Of Brandon Wirtz Sent: Sunday, November 27, 2011 12:19 AM To: [email protected] Subject: [google-appengine] MemCache Vs. EdgeCache While I'm not saying you should ditch memcache for speeding up your output. If you are looking at the effort to implement Memcache through out your code, or getting your headers right to enable edgecache, consider this. In all 3 of the following apps EdgeCache "Hits" were at 40-65% MemCache: 'hits': 2,425, (4%) 'misses': 55,618, 'items': 2,696, 'bytes': 34,992,253, 'hits': 44,668, (27%) 'misses': 163,823, 'items': 1,170, 'bytes': 1,515,333, JeffProbst.com (High Volume, only like 25 pages of content, I think Edge misses are due to geographic diversity) 'hits': 50,943, (74%) 'misses': 68,942, 'items': 100, 'bytes': 618,267, The larger your data set the lower your memcache success will be. From what I can tell Memcache never goes over 3000 items or 35 Megs I haven't been Logging it constantly, so I'm not sure if it is an item or a Meg limit. If you are writing a VERY small app. Using only 1 always on instance writing for Instance memory ensures a much larger cache hit ratio because you get more space and unless your instance resets the data seems to persist. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
