Performance tuning

[Stefan Gofferje]

Ivan Toman schrieb:

> I don't think that using low priority nice will help, because if there
> is enough free CPU resources, kernel will still give lot of CPU cycles
> to your grads process. For example, think about it like this: You have
> grads dedicated machine and don't use CPU for anything except base
> system (relatively idle) and grads, but you run grads with nice=15. What
> will then be CPU usage of grads? Theoretically it will top one of CPU
> cores with near 100% utlisation, regardless of niceness=15. If you have
> now some kind of watchguard on system that has trigger set, for example,
> on 20% CPU utilisation over 3 seconds or more, it will kill your process
> even if it has lowest priority. It all depends how watchguard is setup.
> Try that cpu limiter that I posted link to, I think it can work for you.

It is not about plain CPU-usage in %. During the night time when the
server is not very busy, the process goes through faster and is nerver
terminated. It's only terminated when GrADS is running AND some other
stuff also takes more ressources. I guess, it's either CPU _load_ or
memory but I wasn't able to find out from the admins.

Terve,
Stefan

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