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Tricky question, what happens when CPU/load goes over dedicated limit
This is a possible tricky question all stemming from my database cluster using not super high end nodes (but they are all dedicated at the moment). However, I thought about adding a few vpses that have dedicated cpu for the sake of it. However, when I max writes (via test script, not real world scenario) on my current cluster, my load goes up as high as 60 on 4 cores. So what happens on a vps with 4 dedicated cores - assuming the load goes to 60. I'm assuming virtualization falls apart right and it becomes an abuse case? Just curious if my assumption is correct here because I am assuming the host node must deal with the load somehow? Any providers with any experience with this? Pretty sure I had a net cup vps that had load of 10 and never got complain (and yes this was certainly due to a misconfiguration on my part) but they never complained but a load of 60 makes me wonder.
Comments
"load" is a concept from your kernel and is invisible from outside the KVM.
Hence, you can continuing abusing CPU, as long as you don't exceed I/O limits.
Thank you @yoursunny for the insight there. I thought about this but wasn't sure so happy to have you confirm that.
If they are 100% dedicated, you don't have to worry about cpu usage at all.
However, still keep an eye on I/O, since this is still shared, especially when you run a fat database.
Thanks @Neoon! If anyone knows, do VPS providers usually limit VPS I/O to avoid these type of situations? Just an added curiousity there. I should indeed double check to see if the high load is an effect of IO saturation (very likely I suspect!)
Some do, some don't because e.g it looks better on the benchmarks.
So you could already have a limit on your box, but still then, it could be configured to limit the impact of a potential abuse however hitting the limit consistently could be still seen as abuse by the provider.
Just ask your provider and keep monitoring your machine.
Few known hosts here do it. Netcup, Contabo, Hostslick...