> Another question, you both recommended Python for some of its > features, but isn't Python much slower than Java?
Maybe, maybe not, but it may not matter. What fraction of your run- time actually depends on language speed? On Nov 28, 9:13 am, Eric <shel...@gmail.com> wrote: > Another question, you both recommended Python for some of its > features, but isn't Python much slower than Java? So wouldn't that > necessitate many more instances/CPUs to keep with the query load? > > On Nov 28, 9:45 am, Niklas Rosencrantz <teknik...@gmail.com> wrote: > > > > > >> 1) pricing > > > absolutely seems so. gae apps 1/20 cheaper than previous > > hostingmethods (servers)>> 2) latency resulting from slow CPU, JIT > > compiles, etc. > > > latency oriented group we don't focus > > onhttp://groups.google.com/group/make-the-web-faster > > in the long run, yes. you can compare to dedicated physical server, > > much more difficult to configure, compile modules spec for physical > > architecture, get superiour response time with C++ server pages ouput > > "hello world" while best project is security and convenience are > > kings. latency least prio still important. > > > python is good, same thing in python 1/10 code compared to java, no > > XML, yaml very neat. java strong point: more ways to solve same > > problem. > > > On Sat, Nov 28, 2009 at 6:35 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. > > > > -- > > > > 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.
