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Subject: Re: [OMPI users] mixed versions of openmpi ? (1.4.1 and 1.4.3)
From: Reuti (reuti_at_[hidden])
Date: 2010-10-29 12:40:33


Hi,

Am 29.10.2010 um 18:27 schrieb Jeff Squyres:

> I'd have to go check 1.4.3 and 1.4.1 to be sure, but I would generally *NOT* assume that different versions like this are compatible.

I'm getting confused, as these versions are exactly fitting "x.(y+1).*" which you mention below. So they should work together by design.

-- Reuti

> Open MPI makes an ABI promise (that started with version 1.3.2) that all the releases in a given feature series and its corresponding super-stable series (i.e., x.y.* and x.(y+1).*, where y is odd) are ABI compatible. But we make no guarantees about wire protocols being compatible, or other things like that.
>
> So in general, it's "pleasantly surprising" if the different releases work together, but I wouldn't rely on it *at all*. :-)
>
>
> On Oct 29, 2010, at 12:12 PM, guillaume ranquet wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hi list,
>> I'm sorry to bother you with a stupid question.
>>
>> we intend to have for a short period of time, some nodes with 1.4.3 and
>> others with 1.4.1 (before upgrading everyone to 1.4.3).
>>
>> I made various test and found both versions to be running together quite
>> well with a mixed set of nodes.
>>
>> my tests were quite simple, I compiled and ran mpi hello_worlds with
>> both versions.
>> It wouldn't be serious for me to assume both versions fully compatible
>> after these tests -and I must admit I lack the time and technical
>> knowledge to run further testing.
>>
>> has anyone any insight on what have changed that would break compatibility?
>> I guess nothing, since they are the same major.minor :)
>>
>>
>> regards,
>> Guillaume Ranquet.
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>
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
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