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Is load average related to CPU ThreadS OR CPU core?

i am having a xenon cpu with 8 cores and 16 threads.

How much can be the acceptable load average?

Sometimes Load AVerage reaches 11.

so does that means load average upto 16 is with in acceptable range.

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1 Answer 1

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HyperThreaded CPU cores aren't quite full CPU cores, so I'd probably be concerned around a load of 12 or so on a system with 8 physical cores. From a monitoring perspective, your load threshold is technically 16.

Of course, this all depends on what's causing the load increase. If it's all CPU-processing activity, that's different than if some component of the high load is the result of the I/O subsystem and storage.

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Factually wrong. A Hyper-V CPU is mapped to a Logical CPU core of te underlying processor - with Hyper-Threading that is a CPU thread as this is what a Logical core is physically. I never liked load averages as any indicator - at the end a CPU is overlaoded only when it does not do what Needs to be done fast enough. Mabe m HPC Background gets into my way - my CPU's often are 100% load for hours at a time. –  TomTom Nov 4 '12 at 8:39
    
@TomTom The OP isn't speaking about Hyper-V. They are speaking about an Ubuntu system with what's probably a 5500/5600-series Intel Xeon CPU. Storage may be a factor in their setup, thus the question about what's influencing the I/O load. In HPC and financials, we knew not to schedule on HyperThreaded CPU cores in the first place. Don't get self-righteous. –  ewwhite Nov 4 '12 at 9:09

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