JVM and threads

2002-09-22 Thread dan ginsberg
I just joined the list today so my apologies if this has already been covered but hasn't made it to the archive yet. >From lkml: first NPT vs. NGPT vs. LinuxThreads benchmark results at http://www.uwsg.iu.edu/hypermail/linux/kernel/0209.2/1581.html Note as well that there is an NPT mailing list

Re: JVM and threads

2002-09-04 Thread Hui
On Wed, Sep 04, 2002 at 09:28:37AM -0700, Dan Kegel wrote: > I have no idea what Ulrich is planning for his linuxthread replacement, > but once it's out in the open, we can probably finally fix issues > like signal delivery. Is there some public docs on this project ? I'm out of the loop as far a

Re: JVM and threads

2002-09-04 Thread Hui
On Wed, Sep 04, 2002 at 08:41:07AM -0700, Dan Kegel wrote: > You're referring to Linuxthreads? It has a couple other problems, > like pid being different for each thread, and thread startup and > shutdown > not being as fast as thread maniacs (you know, the people who create > more than 1 thread/

Re: JVM and threads

2002-09-04 Thread Hui
On Wed, Sep 04, 2002 at 07:59:30AM -0700, Dan Kegel wrote: > As I wrote in a previous message, Sun is abandoning M:N threading; > see http://java.sun.com/docs/hotspot/threads/threads.html > NGPT is probably a dead end. I suspect Gnu and Linux will continue > on with kernel-based threads, but with

Re: JVM and threads

2002-09-04 Thread Hui
On Wed, Sep 04, 2002 at 10:30:46AM +0200, Ingo Rockel wrote: > I just had a look at the mail-archive of their mailing-list. There is a > statement clarifying, their stuff will NOT work with current JVMs. > > Look here: > http://www-124.ibm.com/pipermail/pthreads-users/2002-August/000250.html >

Re: JVM and threads

2002-09-04 Thread Ingo Rockel
I just had a look at the mail-archive of their mailing-list. There is a statement clarifying, their stuff will NOT work with current JVMs. Look here: http://www-124.ibm.com/pipermail/pthreads-users/2002-August/000250.html It seems also Sun will not support NGPT anytime soon, as they focus on

Re: JVM and threads

2002-09-04 Thread Vincent Touquet
Cool I'm curious too, as I have an MP server... regards v On Wed, Sep 04, 2002 at 09:30:33AM +0200, Marco Trevisan wrote: >Thanks to all you guys! :) > >I will try it (most probabily next week) and report back to the mailing >list. >The main reasons are: >1) I would like to deploy on multi-proc

Re: JVM and threads

2002-09-04 Thread Marco Trevisan
Thanks to all you guys! :) I will try it (most probabily next week) and report back to the mailing list. The main reasons are: 1) I would like to deploy on multi-processor Linux systems without lacking in scalability; 2) If it works, not only Catalina will benefit from this, but the overall se

Re: JVM and threads

2002-09-03 Thread Nathan Meyers
On Tue, Sep 03, 2002 at 10:03:15PM +0200, Marco Trevisan wrote: > I looked at the NGPT home page, surfed the net and found some > interesting benchmarks : > http://www.opengroup.org/rtforum/jan2002/slides/linux/abt.pdf . > > At http://www.ibm.com/developerworks/oss/pthreads/, they say: "This >

Re: JVM and threads

2002-09-03 Thread Hui
On Tue, Sep 03, 2002 at 10:03:15PM +0200, Marco Trevisan wrote: > I found out that the best performing JVM on a single-processor Linux > machine is Blackdown-1.3.1 with green threads and the OpenJIT compiler. > Other JVMs I tried are: IBM v1.3.0 - 1.3.1, Sun v1.3.1 - 1.4.x If there is any gain i

Re: JVM and threads

2002-09-03 Thread Calvin Austin
Yup native threads doing blocking IO on linux is expensive. Things start looking progressively ugly from 50 connections upwards. If you move to NIO you will see a significant improvement in both stability/predictability and performance. What would make it easier for you to try the multiplexing

Re: JVM and threads

2002-09-03 Thread Marco Trevisan
Hello all, I also use Tomcat (v4.0.4), and I have run my webapp with a variety of JVMs in order to find which is best in terms of performance. It could be important to point that my Java code conforms to the 1.3 API specification, no 1.4-exclusive class or method is used. I found out that the

Re: JVM and threads

2002-08-20 Thread Jonathan Doughty
> "Mauricio" == Mauricio Nuñez <[EMAIL PROTECTED]> writes: > Thanks for your answers! > Well, i will need to wait for a back port from kernel 2.5 to 2.4 ... > I'm trying to get a better performance with Tomcat (a servlet > container). > The servlet spec say '1 request: 1 thread', then with

Re: JVM and threads

2002-08-20 Thread Mauricio Nuñez
Thanks for your answers! Well, i will need to wait for a back port from kernel 2.5 to 2.4 ... I'm trying to get a better performance with Tomcat (a servlet container). The servlet spec say '1 request: 1 thread', then with high concurrent requests, my server is less responsive. Thanks El mar

Re: JVM and threads

2002-08-20 Thread Juergen Kreileder
Mauricio Nuñez <[EMAIL PROTECTED]> writes: > Blackdown JVM 1.3 support green and native threads, but 1.4 only > native. Threading is an important issue for the server side java > applications. > > Green threads are very scalable ( see Volano report ), Yes, but only on one CPU. > while the nat

JVM and threads

2002-08-20 Thread Mauricio Nuñez
Hi, Blackdown JVM 1.3 support green and native threads, but 1.4 only native. Threading is an important issue for the server side java applications. Green threads are very scalable ( see Volano report ), while the native threads under Linux are a limited to few , before the server crash. IBM rel