High Performance Computing Group

Hi,
I am confused about the "correct" syntax for the model parameter in the select[...] resources string. 
As the requirement (according to the documentation) is, that everything should evaluate as a logical expression, I would assume that "select[ model == hostmodel]" is the correct syntax!  However, in the configuration file we got from IBM support, and have been using happily for years(!), we see this: "select[model = hostmodel]" (this is in the RES_REQ section of a queue in lsb.queues).  
What is correct: "model == ..." or "model = ..."?  Is there a difference, or are they treated the same (undocumented feature)?  If the single "=" is not correct, why does it still work? 

Regards, Bernd



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Bernd Dammann
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#SpectrumComputingGroup

It should be "model=something", e.g. bsub -R "model=Intel_E5"  or bsub -R "model!=Intel_E5". The model value of a host should be displayed in lshosts output.

------------------------------
YI SUN
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Original Message:
Sent: Mon June 27, 2022 06:55 AM
From: Bernd Dammann
Subject: Selecting host model - correct syntax

Hi,
I am confused about the "correct" syntax for the model parameter in the select[...] resources string. 
As the requirement (according to the documentation) is, that everything should evaluate as a logical expression, I would assume that "select[ model == hostmodel]" is the correct syntax!  However, in the configuration file we got from IBM support, and have been using happily for years(!), we see this: "select[model = hostmodel]" (this is in the RES_REQ section of a queue in lsb.queues).  
What is correct: "model == ..." or "model = ..."?  Is there a difference, or are they treated the same (undocumented feature)?  If the single "=" is not correct, why does it still work? 

Regards, Bernd



------------------------------
Bernd Dammann
------------------------------

#SpectrumComputingGroup

Thanks!   The single "=" seems to work, but it still conflicts with the documentation, where the examples with  "model" are using "==", e.g. like in "model == local" (see https://www.ibm.com/docs/en/spectrum-lsf/10.1.0?topic=strings-selection-string).  Furthermore, on the same page, in the section "Operators", only "==" is mentioned! 

When I test with bsub, both versions do the correct host selection, i.e. both 'bsub -R "model=Intel_E5"' and 'bsub -R "model==Intel_E5"' get dispatched to the host model Intel_E5.

------------------------------
Bernd Dammann
------------------------------

Original Message:
Sent: Mon June 27, 2022 11:12 AM
From: YI SUN
Subject: Selecting host model - correct syntax

It should be "model=something", e.g. bsub -R "model=Intel_E5"  or bsub -R "model!=Intel_E5". The model value of a host should be displayed in lshosts output.

------------------------------
YI SUN

Original Message:
Sent: Mon June 27, 2022 06:55 AM
From: Bernd Dammann
Subject: Selecting host model - correct syntax

Hi,
I am confused about the "correct" syntax for the model parameter in the select[...] resources string. 
As the requirement (according to the documentation) is, that everything should evaluate as a logical expression, I would assume that "select[ model == hostmodel]" is the correct syntax!  However, in the configuration file we got from IBM support, and have been using happily for years(!), we see this: "select[model = hostmodel]" (this is in the RES_REQ section of a queue in lsb.queues).  
What is correct: "model == ..." or "model = ..."?  Is there a difference, or are they treated the same (undocumented feature)?  If the single "=" is not correct, why does it still work? 

Regards, Bernd



------------------------------
Bernd Dammann
------------------------------

#SpectrumComputingGroup