Re: [Gems-users] Workloads

[Dan Gibson <degibson@xxxxxxxx>]

Dave,
Multifacet does not distribute its workloads due to complications with proprietary software. Others have been successful in reproducing similar workloads independently, however, and some may be found online. (Note apache is bundled with many *nix distributions)
The SPLASH suite website: http://www-flash.stanford.edu/apps/SPLASH/

The preferred method is usually to compile the workloads on a real machine and then move them to the target. This is to prevent very long *simulated* compile-times. Your choice of static vs. dynamic linkage should reflect the libraries available on your simulated target.

Finally, since GEMS uses Simics to model *full-system* simulation, by default GEMS will collect statistics from combined User/OS execution. However, if you want to collect data from user-space only (assuming you are NOT using Opal), I recommend you modify Ruby's commands.C (I believe the relevant function there is operate_memory() ) to check memory references (memory_transaction_t / v9_memory_transaction_t) for their "priv" bit. (See the Simics Programming Guide, Simics Target Guide: Serengeti, and Simics Reference Manual). If the bit is set, simply return from the appropriate function immediatially instead of calling any other Ruby functionality -- this will artificially make all OS functionality invisible to Ruby. Be sure to return "zero", to prevent the calling Simics processor from stalling.

Good luck.

Regards,
Dan

Dave wrote:

Hello,

I have a few questions on the workloads explained at http://www.cs.wisc.edu/gems/doc/wiki/moin.cgi/gen-scripts. The workloads are not distributed in the GEMS release, but where can we obtain them? We need to compile the workloads on a real Sun machine and then simulate them, right? Are shared libraries okay or do we need to statically link the programs? How can we isolate the program simulation if we don't want to get metrics related with the OS?

Thank you for help.

Dave

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