I'm quite sure the issue is related to jaguar (or my machines). For example
with mpich 1.2.4 (which also doesn't work on my multiple machines under
jaguar) I had to change the socket buffer size to >= 32 KB to work locally
(the default was 16). Something in there changed...
Ricardo
On 05/09/2002 8:14, "lam-request_at_[hidden]" <lam-request_at_[hidden]>
wrote:
> On Wed, 4 Sep 2002, Ricardo Fonseca wrote:
>
>> I've been trying LAM (6.6b2cvs) on MacOS X 10.2 (Jaguar release, build
>> 6C115) using the latest developer tools (aug. 2002 update). All rpi's
>> (except Myrinet GM) work ok on a single node, since jaguar now includes the
>> proper semaphores; however, when I try it on two different computers I get
>> very poor bandwidth:
>
> We're actually just now getting our Apple machines up and running under
> Jaguar. We haven't even got to real LAM testing yet :(.
>
>> (yes, the tcp rpi is actually MUCH slower than the lamd). These results are
>> average results for a 1Mb message, and they varied a lot for the 10 messages
>> tested. This is running on a 100 Mb/s network. Tests with lam 6.5.6 on the
>> same network gave about 11.7 MB/s with very low variance (with other
>> machines).
>
> Very strange. I can't thing of anything that would cause that great of a
> variance in the CVS version but not cause the problem under 6.5.6. Like I
> said, I haven't gotten to running tests of LAM on Jaguar yet, other than
> to notice that SysV semaphores seemed to work properly.
>
> At this point, I wouldn't assume the problem is in your machines. I
> wouldn't rule that out, either :). I'll try to run some tests between my
> iBook and my G4 tower and see if I can come up with anything. Obviously,
> I'm not going to get great numbers out of that combo, but I should be able
> to see the problem you are describing...
>
> Brian
>
> --
> Brian Barrett
> LAM/MPI developer and all around nice guy
> Have a LAM/MPI day: http://www.lam-mpi.org/
>
_______________________________________________
This list is archived at http://www.lam-mpi.org/MailArchives/lam/
|
