[mpich-discuss] Hydra issues

[Scott Atchley]

On Aug 26, 2009, at 1:38 PM, Dave Goodell wrote:

> On Aug 26, 2009, at 9:19 AM, Dave Goodell wrote:
>
>> On Aug 26, 2009, at 8:58 AM, Scott Atchley wrote:
>>
>>> Ok, I was not patient enough. If I let it run, it eventually  
>>> starts. The actual walltime is nearly the same as when I use  
>>> proxies, but the stdout is delayed until the application completes.
>>
>> I think I know why this happens.  It ought to be fixed once I  
>> finish up some Hydra I/O work that was mostly done by one of our  
>> students this summer.  The work is basically done and lives on a  
>> development branch but it needs a little bit of cleanup and to be  
>> rebased onto the current trunk.
>
> I was mistaken on this particular issue.  There was another  
> buffering issue that we ran into during the student's work and I was  
> thinking of that one.  There isn't any current hydra-side fix for  
> this that I know of.
>
> 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).

Scott