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Subject: Re: [OMPI users] pipe function call failed...
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-03-09 22:08:31

On Mar 9, 2010, at 7:26 PM, Lasse Kliemann wrote:

> Thanks for your help, Ralph.
> --disable-pty-support indeed makes the problem go away.
> The system is self-made and non-standard. I have in my kernel
> config:
> # CONFIG_LEGACY_PTYS is not set
> Maybe legacy PTYs are required?

I honestly don't know - my suggestion was based solely on the glibc documentation stating that the error you got was due to the file descriptor not pointing to a pty device.

Best guess: perhaps glibc isn't recognizing this pty configuration...?

> Moreover, the system uses UDEV (version 151). I presume that PTYs
> are in use: a directory /dev/pts/ exists and is populated with
> devices. When I do ps, it gives something like pts/1 as TTY.
> * Message by -Ralph Castain- from Tue 2010-03-09:
>> Okay, I dug thru the glibc 2.11 manual - there doesn't appear
>> to be any problem here in the code itself.
>> The problem instead, I believe, is caused by your system not
>> supporting pty's, yet you are trying to use them. In this case,
>> tcgetattr will return errno 22 because the file descriptor is
>> not pointing to a correct terminal.
>> Try configuring with --disable-pty-support and see if that
>> fixes the problem.
>> BTW: what system are you running this on?
>> On Mar 9, 2010, at 4:34 PM, Lasse Kliemann wrote:
>>> Alas, I am by far no Glibc expert. I did a grep through the Glibc
>>> changelog, but only found a reference to tcgetattr from 2006.
>>> Of course, I would also like to see a real solution here instead
>>> of ignoring the error condition.
>>> * Message by -Ralph Castain- from Tue 2010-03-09:
>>>> Ignoring an error doesn't seem like a good idea. The real
>>>> question is why we are getting that error - it sounds like the
>>>> newest Glibc release has changed the API?? Can you send us the
>>>> revised one so we can put in a test and use the correct API for
>>>> the installed version?
>>>> On Mar 9, 2010, at 9:40 AM, Lasse Kliemann wrote:
>>>>> $ mpirun -n 1 ls
>>>>> --------------------------------------------------------------------------
>>>>> mpirun was unable to launch the specified application as it encountered an error:
>>>>> Error: pipe function call failed when setting up I/O forwarding subsystem
>>>>> Node: xxxxx.xxxxxxxxxx.xxxxxxxx.xx
>>>>> while attempting to start process rank 0.
>>>>> --------------------------------------------------------------------------
>>>>> I receive this error constantly. I tracked it down so far that it
>>>>> appears now certain that the 'tcgetattr' and 'tcsetattr' calls in
>>>>> 'orte/mca/iof/base/iof_base_setup.c' are responsible. 'errno' is
>>>>> set to 22 each, which means 'invalid argument'. We can simply
>>>>> ignore the return values of these calls and continue, as done in
>>>>> the attached patch. Some simple tests suggest that everything
>>>>> else is fine, but I haven't tested thoroughly yet.
>>>>> On another system, this problem is absent. The main difference
>>>>> are GCC and Glibc versions. The problematic system uses GCC 4.3.4
>>>>> and Glibc 2.11.1 -- which is the newest Glibc release and maybe
>>>>> untested yet with OpenMPI.
>>>>> Let me know which additional information I can provide to further
>>>>> analyze this issue.
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