At $work we've been having a discussion about what the right amount of swap is
for a given amount of RAM in our standard linux image and I'm looking for
additional input.
The "old school" conventional wisdom says "swap = 2x RAM". The more modern
conventional wisdom seems to vary from "swap = 1x RAM + 4G" to "swap = 4G
regardless of RAM".
So if you're running/managing a Linux HPC cluster, or you have strong opinions
on the subject, or you just want to comment :), I love to hear you're thoughts.
Some info about our environment... We have several HPC clusters scattered
around the globe with anywhere
from 100 to somewhat over 1000 systems in each cluster. Workload in
the clusters is managed using LSF and typically they are configured to
have one job-slot per cpu. The memory configs in each system ranges
from 4G RAM up to 512G. Not sure if the OS version matters but in case
it does, we're primarily running RHEL4u5 and starting a migration to
RHEL5u3.
Thanks much,
Matt
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"If they are the pillars of our community,
We better keep a sharp eye on the roof."
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