[GridSim-developers] Crashed simulation with thousands of threads

[Shuo Y. <ya...@cs...>]

Dear GridSim team,

I'm Shuo Yang, a PhD student at University of Manchester, UK. I'm doing
my research project with simulations based on GridSim. However I
encountered scalability issues in the simulation where there are around
4000 threads (entities) with Java exception 

'java.lang.OutOfMemoryError: Java heap space'

The simulation ran for ~48 hours with increasing memory usage and ended
up with the OutOfMemoryError exceptions. Please could you help more with
tuning? Here's more info:

$ uname -a
Linux nimue.rcs.manchester.ac.uk 2.6.18-1.2798.fc6 #1 SMP Mon Oct 16
14:54:20 EDT 2006 i686 i686 i386 GNU/Linux

$ java -version
java version "1.6.0_06"
Java(TM) SE Runtime Environment (build 1.6.0_06-b02)
Java HotSpot(TM) Server VM (build 10.0-b22, mixed mode)


$ ps aux | grep java

yangs    12579  109 43.7 2915672 1473316 ?     Sl   03:10 1011:15 java
-Xss128k -Xms1024m -Xmx1024m -cp gridsim-lib/gridsim.jar:.
topology/HierarchySimulation true


$ free -mt
             total       used       free     shared    buffers
cached
Mem:          3290       2055       1235          0         83
363
-/+ buffers/cache:       1608       1682
Swap:         8001          0       8001
Total:       11291       2055       9236


$ top
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  SWAP CODE
DATA COMMAND 
12579 yangs     17   0 2847m 1.4g 5624 S  100 43.7   1057:02 1.4g   40
2.8g java 




Many thanks,

Shuo 'Alex' Yang.
School of Computer Science
University of Manchester