Re: [HTCondor-users] MOUNT_UNDER_SCRATCH

[Greg Thain <gthain@xxxxxxxxxxx>]

On 4/30/19 10:16 PM, Mary Romelfanger wrote:

Hi,

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We were a little behind because of the timing of some code deliveries and software freezes. We have an update window so we are moving from 8.6.9 to 8.8.2.

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This new installation found MOUNT_UNDER_SCRATCH set to â/var/tmp, /tmpâ by default instead of blank as it has been in the previous deliveries.

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Mary:

The actual change was done in ticket #6768, along with a large number of other default changes, but the initial ticket to support MOUNT_UNDER_SCRATCH was done in #2015.

What this does is to give each job a private /tmp and /var/tmp dir, backed by storage in the scratch directory. When MOUNT_UNDER_SCRATCH is set to /tmp and /var/tmp, it means that a job that writes to /tmp until full only impacts itself, and doesn't disable every process on the machine that needs to write to /tmp or /var/tmp.

-greg