> Maybe I don't understand something, but why should the 5 second setup > on a new instance bother me? A new instance should be created when > other instances are near capacity, and not when they exceed it, right? > So once initialized it can be "dummy-run" internally and only > available 5 seconds later while the existing instance continue to take > care of the incoming queries.
What makes you think that the request that causes the creation of a new instance doesn't wait for the creation of said instance? (The scheme you suggest is plausible, but why do you think that it's how appengine works?) On Nov 28, 9:03 am, Eric <shel...@gmail.com> wrote: > Thanks for the response. > > Maybe I don't understand something, but why should the 5 second setup > on a new instance bother me? A new instance should be created when > other instances are near capacity, and not when they exceed it, right? > So once initialized it can be "dummy-run" internally and only > available 5 seconds later while the existing instance continue to take > care of the incoming queries. > > Also, do you think the latency requirements are realistic with GAE? > That is, in the ordinary case, could the response be consistently > served back to the querying user with delay of max 3 seconds? > > On Nov 28, 8:35 am, 风笑雪 <kea...@gmail.com> wrote: > > > > > The White House hosted an online town hall meeting on GAE with GWT, > > and received 700 hits per second at its > > peak.http://google-code-updates.blogspot.com/2009/04/google-developer-prod... > > > But more than 1000 queries a second is never been tested. > > > I think Java is not a good choice in your case. When your user > > suddenly increasing, starting a new Jave instance may cost more than 5 > > seconds, while Python needs less than 1 second. > > > 2009/11/27 Eric <shel...@gmail.com>: > > > > Hi, > > > > I wish to set up a CPU-intensive time-important query service for > > > users on the internet. > > > Is GAE with Java the right choice? (as compared to other clouds, or > > > non-cloud architecture) > > > Specifically, in terms of: > > > 1) pricing > > > 2) latency resulting from slow CPU, JIT compiles, etc.. > > > 3) latency resulting from communication of processes inside the cloud > > > (e.g. a queuing process and a calculation process) > > > 4) latency of communication between cloud and end user > > > > A usage scenario I am expecting is: > > > - a typical user sends a query (XML of size around 1K) once every 30 > > > seconds on average, > > > - Each query requires a numerical computation of average time 0.2 sec > > > and max time 1 sec (on a 1 GHz Pentium). The computation requires no > > > data other than the query itself. > > > - The delay a user experiences between sending a query and receiving a > > > response should be on average no more than 2 seconds and in general no > > > more than 5 seconds. > > > - A background save to a DB of the response should occur (not time > > > critical) > > > - There can be up to 30000 simultaneous users - i.e., on average 1000 > > > queries a second, each requiring an average 0.2 sec calculation, so > > > that would necessitate around 200 CPUs. > > > > Is this feasible on GAE Java? > > > If so, where can I learn about the correct design methodology for such > > > a project on GAE? > > > > If this is the wrong forum to ask this, I'd appreciate redirection. > > > > Thanks, > > > > Eric > > > > -- > > > > You received this message because you are subscribed to the Google Groups > > > "Google App Engine" group. > > > To post to this group, send email to google-appeng...@googlegroups.com. > > > To unsubscribe from this group, send email to > > > google-appengine+unsubscr...@googlegroups.com. > > > For more options, visit this group > > > athttp://groups.google.com/group/google-appengine?hl=en.- Hide quoted > > > text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
