Re: [GridSim-users] Crashed simulation with thousands of threads

[Marcos D. de A. <ma...@cs...>]

Dear Shuo Yang,

I am wondering if you could explain in more detail what the 4,000  
entities actually do. Are you using the Workload class for job  
submission? If yes, how many instances of it do you have? How many  
jobs in average are the user entities/workloads submitting? Have you  
enabled the trace mode (the simulation is generating log files)? How  
many resources do you have? What resource allocation policies are  
they using?

Regards,

Marcos

On 10/07/2008, at 7:12 PM, Shuo Yang wrote:

> 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
>
>
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Marcos Dias de Assuncao
Grid Computing and Distributed Systems (GRIDS) Laboratory
Department of Computer Science and Software Engineering
The University of Melbourne, Australia
Email: ma...@cs...

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