FAQ

This FAQ page is written for people who already have an account on a supercomputer. If you need an account, our User Accounts pages will help you to obtain an account on the machine(s) that best suit(s) your needs.

User Accounts

General:

Q: How do I force my executable, a.out, to stop making core files?

A: Insert one of the following commands into your batch script:

For bash users:

ulimit -c 0

For csh/tcsh users:

limit coredumpsize 0

Cosmos:

Q: What does it mean when my batch job fails with
    ssh: connect to host n167 port 22: No route to host
when running on more than 64 CPU's?

A: This is a know problem on Cosmos, and there is a workaround. You need to change your shell from csh/tcsh to bash on Cosmos and all compute nodes.

To permanently change your shell on our Linux systems, use the chsh command:
    chsh
This command will ask for your password, and then ask for your new login shell.
    /bin/bash

The change will take effect the next time you log in. On Cosmos, the change will propagate to the compute nodes around 5:00 p.m. daily. On Gemini, the shell change will propagate to Castor and Pollux within an hour.

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