How scheduler determines number of simultaneous requests for each instance?
2011/10/16 Andrei Cosmin Fifiiţă <andrei.fifi...@gmail.com> > Well, the requests are independent form each other (threadsafe) and are > only related to datastore (each request also triggers task creation for > different log writes). Should't all request that arrive "at the same time" > be resolved in parallel ? > > On 16 October 2011 20:34, Brandon Wirtz <drak...@digerat.com> wrote: > >> >> Concurrency isn't as "concurrent" as a lot of people think it is. Just >> like >> Multi-Tasking. >> >> If your App does "Calculate the pi to the power of X and return the >> Significant Digit in Y position" Your App will consume 100% of the CPU >> and >> you get 0 Concurrent request. If it does so fast enough the Pending >> Latency >> may allow a single instance to respond to a bunch of requests that arrive >> at >> the same time, but they will process in Serial. >> >> If your app does "Fetch X URL and return bytes 1234 through 4321" Most of >> the time will be spent in the FetchURL Api, and while that is happening >> other requests can execute. >> >> Because of this My APP that uses about 98% CPU from API's has HUGE >> concurrency on Python 2.7. but Huge is still something like 8 not 80. But >> when you pay for instances, not consumed CPU this saved me a lot of money. >> >> In any event, your answer is: It depends on how you are using the CPU >> Cycles, and how you use API's or other things that would create a wait >> state, along with what the pending latency is. >> >> >> -----Original Message----- >> From: google-appengine@googlegroups.com >> [mailto:google-appengine@googlegroups.com] On Behalf Of Ice13ill >> Sent: Sunday, October 16, 2011 9:25 AM >> To: Google App Engine >> Subject: [google-appengine] Maximum concurrent user requests >> >> Hello, i know that you can allow concurrent user requests, for example, in >> java, by specifying threadsafe = true in your appengine- web.xml, but how >> many requests can be actually executed by a servlet in parallel ? >> For example, if N users make a request at the same moment, will there be a >> number of requests put into wait ?. Let's say M user requests will be >> treated (M < N ) and M-N requests will wait ? >> >> -- >> 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-appengine@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. >> >> >> -- >> 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-appengine@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. >> >> > -- > 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-appengine@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. > -- С уважением, Кулин Тимофей. Телефон: +7 (4852) 974793 ICQ: 114902104 email: timo...@koolin.ru Blog: http://timofey.koolin.ru -- 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-appengine@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.
