Because I thought that all 3 methods that did not work involved storing data in Datastore. If you used Backend RAM as storage, well, ok it is an inventive way to use Backend, I guess. I think Backends are a wrong feature all together. I just does not with GAE concept as a scalable, no-configuration system. But I guess we have ourselves to blame. Some of us screamed so much about 60 sec time limit in front-ends. And this time Google decided to "listen" and gave us Backends :)
On Wednesday, August 8, 2012 10:27:23 AM UTC-7, Jeff Schnitzer wrote: > > On Wed, Aug 8, 2012 at 9:24 AM, vlad <[email protected] <javascript:>> > wrote: > > Jeff, what storage subsystem did you use on your dedicated host? If you > kept > > all data in RAM then it is just a sleuth of hand. Overall I am not > surprised > > about lame performance of backends and pull queues. I am a bit surprised > on > > the cost of doing it in Datastore. Good work! > > Why do you call it sleuth of hand? Storing the data in RAM represents > the actual business need. We're doing not only an apples-to-apples > comparison but an "actual implementation of business case to actual > implementation of business case". > > Persistent RAM is one of the principal values of a Backend, and it > turns out that they aren't very useful for that purpose. Not only is > QPS low, but if you saw my post in Brandon's thread, latency is > erratic and horrible. > > Just to give some latency numbers: Urlfetches to the rackspace VPS > are consistently 30-50ms. Not great, but tolerable. Urlfetches to a > backend average about the same - they skew more towards 15-25ms, but > there are a large number of 250ms+ outliers that push up the > arithmetic mean. > > No-op fetches F1 to B1: > https://img.skitch.com/20120808-nn749683wqdg5516fy732k71iw.jpg > No-op fetches F1 to B8: > https://img.skitch.com/20120808-gerejtgfd958i691hsiw897wjw.jpg > > The test F1 to Rackspace: > https://img.skitch.com/20120808-npj3kutc2p511bw5gujxkm5kg4.jpg > > BTW I picked Rackspace for this test because I happened to already > have a VPS there. I would love to see latency numbers for Linode, > EC2, and Google Compute Engine. Does anyone want to run the test? > I'm still waiting for an invite to GCE. > > Jeff > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/QkgjhzW4RTQJ. 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.
