[Swift-devel] [Bug 72] Campaign for scaling wf up to 244 molecules

[Ioan Raicu]

There is an option to have a pool of threads work on these data 
structures, but the pool size is set to 1.  Point is well taken, we have 
fixed this, but I am not convinced this is where the problem was.  We'll 
see after we do another run with all the extra logging.

Ioan

Mihael Hategan wrote:
>>> - did Mihael discover an error in Falkon mutex code?
>>>
>>>   
>>>       
>> We are not sure, but we are adding extra synchronization in several 
>> parts of the Falkon provider.  The reason we are saying that we are not 
>> sure is that we stress tested (pushing 50~100 tasks/sec) both the Falkon 
>> provider and Falkon itself over and over again, and we never encountered 
>> this.  Now, we have a workflow that has an average of 1 task/sec, I find 
>> it hard to beleive that a synchronization issue that never surfaced 
>> before under stress testing is surfacing now under such a light load.
>>     
>
> ?!?
> You are mutating maps and list from concurrent threads without
> synchronization. That is a problem regardless of any other
> considerations.
>
> Mihael
>
>
>
>
>   

-- 
============================================
Ioan Raicu
Ph.D. Student
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Distributed Systems Laboratory
Computer Science Department
University of Chicago
1100 E. 58th Street, Ryerson Hall
Chicago, IL 60637
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Email: iraicu at cs.uchicago.edu
Web:   http://www.cs.uchicago.edu/~iraicu
       http://dsl.cs.uchicago.edu/
============================================
============================================

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