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From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2007-08-31 08:26:39


George --

What do you say about committing your patch?

On Aug 31, 2007, at 7:06 AM, Simon Hammond wrote:

> On 31/08/2007, Gleb Natapov <glebn_at_[hidden]> wrote:
>> On Fri, Aug 31, 2007 at 10:49:10AM +0200, Sven Stork wrote:
>>> On Friday 31 August 2007 09:07, Gleb Natapov wrote:
>>>> On Fri, Aug 31, 2007 at 08:04:00AM +0100, Simon Hammond wrote:
>>>>> On 31/08/2007, Lev Givon <lev_at_[hidden]> wrote:
>>>>>> Received from George Bosilca on Thu, Aug 30, 2007 at
>>>>>> 07:42:52PM EDT:
>>>>>>> I have a patch for this, but I never felt a real need for it,
>>>>>>> so I
>>>>>>> never push it in the trunk. I'm not completely convinced that
>>>>>>> we need
>>>>>>> it, except in some really strange situations (read grid). Why
>>>>>>> do you
>>>>>>> need a port range ? For avoiding firewalls ?
>>>>>
>>>>> We are planning on using OpenMPI as the basis for running MPI jobs
>>>>> across a series of workstations overnight. The workstations are
>>>>> locked
>>>>> down so that only a small number of ports are available for
>>>>> use. If we
>>>>> try to use anything else its disaster.
>>>>>
>>>>> Unfortunately this is really an organizational policy above
>>>>> anything
>>>>> else and its very difficult to get it to change.
>>>>>
>>>>>
>>>> As workaround you can write application that will bind to all
>>>> ports that
>>>> are not allowed to be used by MPI before running MPI job.
>>>
>>> Another option could be (if that match your policy) to limit the
>>> dynamic port
>>> range that is used by your OS. By this all application (unless
>>> they ask for
>>> an specific port) will get ports in this limited port range. If
>>> so the
>>> following link might be interesting for you:
>>>
>>> http://www.ncftp.com/ncftpd/doc/misc/ephemeral_ports.html
>>>
>> I was sure it is possible to set a port range on Linux, but didn't
>> know how.
>> This is much better workaround.
>
> Thanks guys, I'll give this a try.
>
>
> Si Hammond
>
>>
>> --
>> Gleb.
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-- 
Jeff Squyres
Cisco Systems