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Special directories on RAM
On TEMS, some Some special directories are not disk-based but actually mapped into the node's main memory. While there There are no limits set on exclusive nodes (running on parallel queues. However, when running On on shared nodes (GPILs) on fractional or interactive queues, this could lead to a single application or user consuming a great portion of the total memory available or filling up the existing limits and exhausting all the memory of the node and thus impacting others. This is why the following limits are set:
| Directory | New size/ limit |
|---|---|
| /tmp | 64 MB 428 GB (80% of available memory) per user's session |
| /var/tmp | 64 MB 428 GB (80% of available memory) per user's session |
| /dev/shm | 1 GB 428 GB (80% of available memory) per user's session |
| $XDG_RUNTIME_DIR | 64 MB per user's session |
Users should instead use the general purpose file systems available, and in particular, $TMPDIR or $SCRATCHDIR for temporary storage per session or job. See HPC2020: Filesystems.
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