Load (computing): Difference between revisions

Revision as of 09:59, 10 March 2023

Revision as of 09:59, 10 March 2023

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In a system with four CPUs, a load average of 3.73 would indicate that there were, on average, 3.73 processes ready to run, and each one could be scheduled into a CPU.

On modern UNIX systems, the treatment of [[Thread (computing)|threading]] with respect to load averages varies. Some systems treat threads as processes for the purposes of load average calculation: each thread waiting to run will add 1 to the load. However, other systems, especially systems implementing so-called [[Thread (computer sciencecomputing)#M:N (hybrid threading)|M:N threading]], use different strategies such as counting the process exactly once for the purpose of load (regardless of the number of threads), or counting only threads currently exposed by the user-thread scheduler to the kernel, which may depend on the level of concurrency set on the process. Linux appears to count each thread separately as adding 1 to the load.<ref>See http://serverfault.com/a/524818/27813</ref>

== CPU load vs CPU utilization ==