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Host Node Allocation (-ssh and -cx) on Linux HPC

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Old   October 10, 2019, 09:51
Default Host Node Allocation (-ssh and -cx) on Linux HPC
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Dave
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Hi All,

When launching fluent from command line, it seems to be setting up "-ssh" for a connection to the host node and then connecting to the host node using a command in my case looks like "-cx nodename:1234:5678". Currently this host node is always the first node alphabetically, which is causing me issues.

I would like to manually specify which node is the host node when I launch using the same "-cx" command. I can put the "nodename" in fine, but those numbers afterwards I am struggling with. What are they?

They seem to be different depending on the host node, and have seen them in other peoples outputs but can't work out what they are or how its getting them.
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Old   October 10, 2019, 10:58
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port numbers and/or port number ranges
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Old   October 10, 2019, 11:01
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Quote:
Originally Posted by LuckyTran View Post
port numbers and/or port number ranges

the job scheduler normally takes care of the ports
Yes when I submit a normal job I can use fluent fine with just something like

fluent 3ddp -g -pinfiniband -mpi=intel -t200 -cnf=nodefile -i input.commands

Changing this allocation of the host node looks like a total pain, do you know any way to do it? Simply adding "-cx" doesnt work from the command line launch like I intended, it always gets blocked by the firewall presuambly because the ssh isnt setup at that point.
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Old   October 10, 2019, 11:46
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The head node is also determined at the job scheduler level. I.e., the head node is the node that the command gets sent to:

Code:
fluent 3ddp -g -pinfiniband -mpi=intel -t200 -cnf=nodefile -i input.commands

What job scheduler are you using?

Last edited by LuckyTran; October 10, 2019 at 15:16.
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