[mpich-discuss] Hydra issues

[Rusty Lusk]

I assume that you mean launching the MPD ring is slow.  Once the MPD  
ring is up, launching should be quick.   The original idea was that  
the MPD ring would be persistent across jobs, even from different  
people, as long as the jobs used the same nodes.

Rusty

On Wednesday,Aug 26, 2009, at 2:45 PM, Scott Atchley wrote:

> On Aug 26, 2009, at 3:39 PM, Pavan Balaji wrote:
>
>>>> However you could use one of the various workarounds for this,  
>>>> such as an LD_PRELOADed setvbuf call: http://lists.gnu.org/archive/html/bug-coreutils/2008-11/msg00164.html
>>> This does not change the behavior.
>>> I am still stumped as to why there is no delay when using  
>>> persistent (launch-mode=2) versus a delay with no proxies (launch- 
>>> mode=1).
>>
>> This works for me. We need to figure out how to make this portable  
>> now.
>>
>> -- Pavan
>
> Thanks for your persistence (no pun intended).
>
> When running with 1,024 ranks, launching via MPD can take several  
> minutes. I am assuming that hydra will launch in seconds.
>
> Scott