Charm++ parallel programming system

[Evghenii Gaburov <e-gaburov AT northwestern.edu>]

> Make sure you call the parent when you overload those two functions,
> something like the following:
> 
>      void ckAboutToMigrate() { CBase_LB_Test::ckAboutToMigrate(); }
>      void ckJustMigrated() { CBase_LB_Test::ckJustMigrated(); }
Okay, that solves the problem.


> For your production code, make sure you write pup functions that
> pack/unpack all class variables.
Even temporarily variables that are reconstructed during PUP process, and in 
principle
do not require migration? Can this be cause for deadlocks if I do not PUP 
them?

> Also look at possible race conditions in the code. For example, after
> calling AtSync() (assuming you are using periodic load balancing), the
> caller should not send new messages. It should wait for the resume
> from resumefromSync() call.
Okay, I will double check that.

Thanks,
 Evghenii

> 
> Gengbin
> 
> On Tue, Oct 4, 2011 at 10:43 AM, Evghenii Gaburov
> <e-gaburov AT northwestern.edu>
>  wrote:
>>> This program does not PUP the MainCB callback member variable
>>> Variables which are not PUP'd will not retain their value after
>>> migration.  Therefore every migrated element will be calling an
>>> uninitialized callback in ResumeFromSync.
>> So, the freeze still occur even after MainCB is passed to PUP.
>> 
>> The test program I posted in the previous listing
>> sometimes freezes with Greedy[Comm]LB, Refine[Comm]LB & MetisLB, but not 
>> with RotateLB,
>> 
>> when ckAboutToMigrate() & ckJustMigrated() are defined.
>> 
>> #if 1
>>     void ckAboutToMigrate() {}
>>     void ckJustMigrated() {}
>> #endif
>> 
>> Any idea what may happen here?
>> 
>> While in my simulation code I do not use these, I still experience freezes 
>> at ResumeFromSync()
>> after having the code run for about an hour and after a dozens of AtSync() 
>> calls. I cannot reproduce
>> this behaviour in that simple test code, but may be this is related to the 
>> fact that in production code
>> I move a lot of data...
>> 
>> Any help will be of great value!
>> 
>> Cheers,
>>  Evghenii
>> 
>> 
>> 
>> --
>> Evghenii Gaburov, 
>> e-gaburov AT northwestern.edu
>> 
>> 
>> 
>> 
>> 
>> 
>> 
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--
Evghenii Gaburov, 
e-gaburov AT northwestern.edu