[mpich-discuss] Why is my quad core slower than cluster

[Elvedin Trnjanin]

mpicc is the right command to use for compiling, but it doesn't answer 
which compiler. I'd assume that you might use Intel, PathScale, or a PGI 
compiler and possibly gcc at home. Is that the case? If so, it is 
possible that this difference in compilers explains the performance. Or 
it couldn't, but just something to check.

Read the mpicc man page to see how to figure out which compiler it is using.

zach wrote:
> Yes.
> -03 option and mpicc compiler.
>
> On 7/9/08, Elvedin Trnjanin <trnja001 at umn.edu> wrote:
>   
>> Are you using the same compiler and optimization options for both systems?
>>
>>
>> zach wrote:
>>     
>>> I am using a cluster.
>>> Each pc has two cpus and they are Xeon. Each cpu has 4GB, i think red
>>> hat is running.
>>>
>>> I also use a pc at home- quad core intel chip, 8gb ram, ubuntu.
>>>
>>> Both are using mpich.
>>>
>>> I have found that my home pc is only running about 1/3 the speed of
>>> the cluster, and the number of processes (4) and code is the same.
>>>
>>> Can anyone tell me if this is typical, and why, or am I not optimizing
>>> something properly?
>>>
>>> Thanks
>>> Zach
>>>
>>>
>>>
>>>       
>>     
>
>