Re: [Gems-users] Node number limitations?

[Enric Herrero <enricherrero@xxxxxxxx>]

Thank you,
  
  We asked Mike some time ago and he said the same. But using BigSet  gives us the same error. He suggested that it may be a bug in the  network generation code. However we don't know where is this code  generated.
  Sorry for asking this twice but we are a little bit lost in the ruby code.
  
  Regards,
  
  /Marco and Enric

Dan Gibson <degibson@xxxxxxxx> escribió:

The code you are asking about is intended to handle the case where a
"set" consists of multiple words, most of which will be all-1's, but the
topmost will have some of its most-significant bits zeroed. That is the
purpose of the mask associated with that comment.

OptBigSet in general is optimized for 64-bit machines, so the simplest
way to find out if OptBigSet is your problem would be to use BigSet
instead. To do so, edit Set.h and #define BIGSET instead of #define
OPTBIGSET.

Regards,
Dan

Enric Herrero wrote:
> Hi, Thank you for answering.
>
> We use a 32 bit processor and despite setting the file to #define
> __32BITS__ is still not working.
>
> We have also problems with the number of memories used and seems to be
> the same kind of problem. When we use 64 processors and we try to
> access node 55 it is going to node 23.
>
> Desired node 55 -> 110111
> Node accessed 23 -> 10111
> As we see ruby seems to use less bits than the necessary for dealing
> with this number of memories. We have seen that in OptBigSet.C when
> the vectors are defined some masks are applied. Why are these masks
> applied?
> We don't understand the sentence:
>
> // the number of populated spaces in the higest-order array slot is:
> // m_nSize % 32, so the uppermost 32 - m_nSize%32 bits should be
> // cleared
>
> Is this related to our problem? And if it has relation it is possible
> to increase the number of bits used?
>
> Thank you
>
> /Marco and Enric
>
>
> */Dan Gibson /* escribió:
>
> Marco/Enric,
> I think this is a known bug with the file OptBigSet.C, which
> implements bit vectors. With some compiler/platform combinations,
> the macros that OptBigSet.C uses are not properly set. The
> solution is relatively straightforward: Edit OptBigSet.C, and find
> the code that defines either __64BITS__ or __32BITS__, depending
> on your platform, and simply remove the #if condition that selects
> which marco is used. Thus, you might replace:
> #if __amd64__ || __LP64__
> #define __64BITS__
> #else
> #define __32BITS__
> #endif
> with:
> #define __32BITS__
>
> You should also add a #define __32BITS__ to OptBigSet.h.
>
> Regards,
> Dan Gibson
>
>
> Marco Tirado wrote:
>> Hello:
>>
>> We are simulating a CMP system with Ruby. We have succesfully
>> simulated the system with 32 processors. However after increasing
>> the number of nodes in the Network topology file (this for a
>> FILE_SPECIFIED network) we get the following error:
>>
>> failed assertion 'msg_destinations.count() == 0' at fn
>> virtual void PerfectSwitch::wakeup() in
>> network/simple/PerfectSwitch.C:264
>>
>> At first we were using 64 nodes in the network and it worked
>> fine, we get the error when we increase the number of nodes to
>> 96. Since this is the only parameter we have changed in the
>> system, is there any GEMS limitation for the number of nodes or
>> in the number of links ? Any help on this will be apreciated.
>>
>> Marco and Enric
>> ------------------------------------------------------------------------
>>
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>> Gems-users@xxxxxxxxxxx
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