[mpich-discuss] Hydra issues

[Darius Buntinas]

This may be related:  On trunk, I get the output from rank 1
immediately, but I only get rank 0 output when the app exits.

Maybe the buffer settings on the proxy aren't set correctly for rank 0's
stdout socket?

-d

On 08/26/2009 01:55 PM, Scott Atchley wrote:
> 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