[Pvfs2-users] Re: strong and weak scaling non-contiguous parallel benchmark

[Rob Ross]

Hi,

You can quite easily perform either strong or weak scaling studies  
with IOR or noncontig by choosing the correct parameters to the  
application during your sweep.

Rob

On Sep 22, 2008, at 3:14 PM, Nirmal Thacker wrote:

> Nirmal Thacker wrote:
>> Hello,
>>
>> Would any of you be aware of a benchmark out there which performs  
>> both
>> strong scaling and weak scaling for non-contiguous/sequential  
>> accesses
>> parallel I/O?
>>
> *edit: contiguous/sequential accesses
> *not non-contig
> *
>> For eg, in IOR , the work per process/processor/node is constant.  
>> Hence
>> an increase in processes/processors/nodes will increase the total  
>> amount
>> of data written to the remote disk. This is how I have used IOR. And
>> this would classify as weak scaling.
>>
>> However I am looking for a benchmark which performs strong scaling
>> wherein the overall work is constant and irrespective of varying the
>> processes/processors/nodes.
>>
>> AFAIK IOR does not perform strong scaling. I have heard that the NAS
>> benchmarks perform strong scaling, but do they also perform weak  
>> scaling?
>>
>> Moreover are the accesses *[edit:]contiguous*?
>>
>> Nirmal Thacker
>>
>>
>
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