Re: Thread question
Daniel Malmkvist <[email protected]>
| Newsgroups | gmane.comp.java.linux.general |
|---|---|
| Message-ID | <[email protected]> |
Éjmélyböl wrote: >2004-06-14, h keltezéssel 18:02-kor Daniel Malmkvist ezt írta: > > >>Hi >> >>I have a question about threads. I was wondering about what realy >>happens to a thread on the OS level when i set it to read from a socket >>when there is no data there. I use Native threads (not green threads). >> >>Will the thread realy sleep, no contex switch will be done. The thread >>will sleep until a the OS get a interruption from the NIC. >> >>or will thread contex switching still be done to see if there is data to >>be read. >> >>I have an application that should handle alot (>10 000) connection at >>the same time but usally no traffic. Is the best way to make a thread >>pool or is the best way to have 1 thread per connection. If no contex >>switching will be done I don't see why not. >> >>Best regard >> >>/daniel >> >> >> >> > > You shouldn't use blocking IO, if you really want so much concurrent >connections. I've never ever seen a native threading JVM, which were >able to manage thousands of threads (Due to limitations of linux kernels >2.4) So i advise you to use java.nio (non-blocking IO, with selectors) > >BR > Zsombor > > > > > > >---------------------------------------------------------------------- >To UNSUBSCRIBE, email to [email protected] >with a subject of "unsubscribe". Trouble? Contact [email protected] > > > Hi Thanks for all the ansers. I have done som test to see how many threads i could manage at the same time. with the 2.6.x kernel with NPTL enabled + sun JVM 1.4.2 I was able to have >10 000 threads at the same time. The limiting factor was the addressspace of my 32 bit plattform. But if I move to a 64 bit plattform that wouldn't be the case anylonger. What I understand a thread pool will do lot pf unnessesary polling to no good. But in the 1-thread per connection case the only resorces that will be reserverd is a bit of memory (and on a 64 bit plattform that is not a problem). Or am I missing anything, is there any other resorces that will be allocated. /daniel ---------------------------------------------------------------------- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]