Hi Brandon, So how do you explain that Google serves pages in 50ms when GAE serves pages at 300ms ? And what to say about Google instant. These guys can do better than 300ms for sure.
I built my own config on a AWS instance relying on memcache+mysql+php it would server under 50ms. If you look at appstats it says that the requests are processed in 8-10ms but it still takes forever (300ms) before i get it on my computer. Something is taking too long in GAE and i can't figure out why. This could be gzip, this could be network latency (but then i would have the same latency for google.com pages). Only static files are served super fast, certainly due to the google CDN which hosts the files in several locations. Also usually Load Balancers and routers are super fast : look at Amazon infrastructure, your packet will go through a lot of machines before reaching your EC2 instance but you still get super fast response time. Checkin via AppStats again, GQL and memcache READ can be quite fast too (<10ms), plus you dont need a GQL query all the time. The PUT though is very slow but it is understandable given the nature of the architecture and the load on the DB. Forget about Queries though they are way too slow even on small entities batches. 300ms-500ms latency seems okay for non busy websites but it starts to add-up for uber busy sites : when you have 2000 req/s that means more instances, more memory, etc. and thus even more latency since the requests takes longer to process. When the app is not doing much we should expect <100ms response time. I understand that they are running their own flavor of memcache and they adapted the API to make it compatible with the memcache API. There must be other stuff going on too. I'd love to have real details on what's going on from the moment the request is received to the moment it is sent back. On 1 mai, 17:53, "Brandon Wirtz" <[email protected]> wrote: > Yes that should be 310ms its almost 3am, and I should be sleeping. > > From: [email protected] > [mailto:[email protected]] On Behalf Of Brandon Wirtz > Sent: Sunday, May 01, 2011 2:39 AM > To: [email protected] > Subject: RE: [google-appengine] Is GAE expected to get faster in the future? > > Work on your code. Typically my requests are serving in 300ms . Of course > there are a lot of factors, and there are different sweet spots based on the > type of thing you are doing, but you should race "Hello World" on the two, > and Retrieve record containing "Hello World" on the two. > > Often very simple code reveals where the issues lie. > > Also even if GAE were 10% slower for a small application, the win is when > you get to the "I'd need 4 machines to do this much work" because then you > need a load balancer, and you can't do the SQL call via the local machine > you have to connect via the network, all of these things add time. > > In my experience: > > Traditional Setup > > 100ms from End user to infrastructure. > > 180ms to pass the load balancer > > 150ms for Apache/Php/Java to start working on the request (out put hello > world) > > 150ms for SQL to start working on a request > > 200ms to get the SQL request > > 100ms to write and send to user. > > Total time 880ms to server text out of a database as HTML > > GAE > > 100ms from End user to infrastructure. > > 35ms to start working > > 75ms to retrieve via GQL > > 100 MS to send to user > > Total time 305MS > > From: [email protected] > [mailto:[email protected]] On Behalf Of Niklas Rosencrantz > Sent: Sunday, May 01, 2011 1:48 AM > To: [email protected] > Subject: [google-appengine] Is GAE expected to get faster in the future? > > I know we can optimize our code so that it runs faster but still I find > absolute response times from app engine are somewhat slow. Will it get > faster in the future even though I don't redeploy a new more optimized > version? I'm comparing with a physical dedicated rack server running a Linux > + JBoss with JSP servlets and mysql that responded very fast comapred to > same view on app engine. Of course we can measure with yslow the relative > response time which is good on app engine. Thanks for you comments. > Niklas > > -- > 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 > athttp://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 > athttp://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.
