>>>>> Scott Murray writes:
Scott> On Mon, 29 Nov 1999, Artur Biesiadowski wrote:
>> Has anybody implemented it already ? Sun does not seem to try
>> to solve the subject, but I suppose that it should be possible
>> to add select like functionality on top of current jdk
>> (including some native code of course).
>>
>> I'm not thinking about being particulary portable here - as
>> long as I can run it on any 2.2.x linux kernel (no need of
>> windows/solaris compatibility).
Scott> Sun have been working on some kind of poll extension, but
Scott> AFAIK it is only available in some of their Solaris
Scott> Production JDK's.
Yep, there's some demo code in the Solaris production release.
http://guiness.cs.uni-dortmund.de/~kreilede/poller/poller.tar.bz2
contains both the unmodified Solaris version and a version I've
modified for Linux. (I've only changed things to get it working on
Linux at all, it's not tuned and it doesn't work reliable yet.)
Compile with:
gcc -O2 -o libpoller.so -shared -D_REENTRANT -I/usr/local/jdk1.2.2/include
-I/usr/local/jdk1.2.2/include/linux Poller.c
Here are some results from a simple test on a single machine:
With 'java Client 1000':
------------------------
$ LD_LIBRARY_PATH=. java SimpleServer
Serv: Initializing port 4444
Receiving 1024000 bytes from 1000 client connections
Time for all reads (1000 sockets) : 95595
$ JAVA_COMPILER=NONE LD_LIBRARY_PATH=. java PollingServer
Serv: Initializing port 4444
Receiving 1024000 bytes from 1000 client connections
Time for all reads (1000 sockets) : 49283
With 'java Client 2000':
------------------------
$ java SimpleServer
Serv: Initializing port 4444
Receiving 1024000 bytes from 2000 client connections
Time for all reads (2000 sockets) : 313702
$ JAVA_COMPILER=NONE LD_LIBRARY_PATH=. java PollingServer
Serv: Initializing port 4444
Receiving 1024000 bytes from 2000 client connections
Time for all reads (2000 sockets) : 118728
Juergen
--
Juergen Kreileder, Blackdown Java-Linux Porting Team
http://www.blackdown.org/java-linux.html
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