Difference in number of threads using --benchmarks option

[Rohith R]

Hi,

I ran blackscholes from parsec using the command 

./run-sniper -n16 --roi -senergystats  -p parsec-blackscholes -i small -c gainestown and got 16 threads.

 But when I run it using the command :

./run-sniper -n16 -senergystats --benchmarks=parsec-blackscholes-small-16 - c gainestown I get 17 threads. Why is there a difference when using both the options ?

Is it because of the fact that the threads in blackscholes are generated inside the ROI markers and while using the --benchmarks option the ROI markers are ignored (not totally) i.e. the applications are simulated from start to end completely ?

Regards,

Rohith R

[Wim Heirman]

Hi Rohith,

The reason is that the -n switch calculates a new core count parameter, such that the workload doesn't spawn more threads than the -n value; whereas --benchmarks passes the value directly to the workload. This happens in benchmarks/parsec/__init__.py:Program:get_nthreads: when using --benchmarks, nthreads_force is used so the value is used directly.

Regards,

Wim

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[Rohith R]

Hi Wim,

Is there any fix to this yet. Can I get the corr3ect number of threads while using the --benchmarks option by modifying the __init__.py script ?

I was looking at code and tried different things and could not get it to work. Any help would be appreciated here.

Regards,
Rohith R

On Tuesday, November 1, 2016 at 5:22:35 PM UTC+8, Wim Heirman wrote:

Hi Rohith,

The reason is that the -n switch calculates a new core count parameter, such that the workload doesn't spawn more threads than the -n value; whereas --benchmarks passes the value directly to the workload. This happens in benchmarks/parsec/__init__.py:Program:get_nthreads: when using --benchmarks, nthreads_force is used so the value is used directly.

Regards,

Wim

On 1 November 2016 at 06:44, Rohith R <rohi...@gmail.com> wrote:

Hi,

I ran blackscholes from parsec using the command 

./run-sniper -n16 --roi -senergystats  -p parsec-blackscholes -i small -c gainestown and got 16 threads.

 But when I run it using the command :

./run-sniper -n16 -senergystats --benchmarks=parsec-blackscholes-small-16 - c gainestown I get 17 threads. Why is there a difference when using both the options ?

Is it because of the fact that the threads in blackscholes are generated inside the ROI markers and while using the --benchmarks option the ROI markers are ignored (not totally) i.e. the applications are simulated from start to end completely ?

Regards,

Rohith R

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[Wim Heirman]

Hi Rohith,

Whether or not to do the thread count correction is specified by the force_nthreads option. In run-sniper it's automatically added when using --benchmarks on line 287. I think removing it from there should be enough.

Regards,

Wim

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