Re: Make NAMD2.7b1 with cuda bug?

From: Gengbin Zheng (gzheng_at_illinois.edu)
Date: Wed May 13 2009 - 12:09:03 CDT

I am not aware of +idlepoll for mpi version of charm. I can not find it
in the code either.
MPI version of charm is doing idle sleep by default, and does have
+idleblocking to turn on blocking wait, which does not work all the time
(it assume msg under certain max size). But in any case, it is
idleblocking the variable name, instead of idlepolling.

Gengbin

Jim Phillips wrote:
>
> This is incorrect. All versions of Charm++ support +idlepoll, and it
> is needed by CUDA-enabled NAMD to ensure that the GPU is polled
> periodically.
>
> This code was broken for CUDA builds shortly before the 2.7b1 release
> and fixed shortly afterwards. Please try the nightly build source code.
>
> -Jim
>
>
> On Tue, 12 May 2009, Gengbin Zheng wrote:
>
>>
>> That is a bug in NAMD. idelpoll is only defined in net version of
>> charm++, not the mpi-linux-x86_64 version that you are compiling NAMD
>> against.
>> That code should be changed to:
>>
>> #if defined(NAMD_CUDA) && CMK_NET_VERSION
>> if ( ! idlepoll ) {
>> NAMD_die("Please add +idlepoll to command line for proper
>> performance.");
>> }
>> #endif
>>
>>
>> Gengbin
>>
>>
>> Lev Lafayette wrote:
>>> Hello NAMDers,
>>>
>>> I have just installed NAMD2.7b with cuda on our cluster. However
>>> during the install process make failed because idlepoll was not
>>> defined in src/BackEnd.C (line 135)
>>>
>>> The install is with openmpi/1.3.2-intel and intel/11.0 compilers.
>>>
>>> The configure command was ./config Linux-x86_64-icc --charm-arch
>>> mpi-linux-x86_64 --with-cuda
>>>
>>> An attempt to make however results with:
>>>
>>> src/BackEnd.C(135): error: identifier "idlepoll" is undefined.
>>>
>>> As a dirty hack I've commented out the relevant lines in src/BackEnd.C
>>>
>>>
>>> //#ifdef NAMD_CUDA
>>> // if ( ! idlepoll ) {
>>> // NAMD_die("Please add +idlepoll to command line for proper
>>> performance.");
>>> // }
>>> //#endif
>>>
>>> . and it seems to make just fine after this and test jobs work.
>>>
>>>
>>> Regards,
>>>
>>>

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