 | | | Meaning of 'load ' on Linux | Meaning of 'load ' on Linux 2005-06-16 - By John Haxby
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Rik van Riel wrote:
>On Thu, 16 Jun 2005, Tom Sightler wrote:
>
>
>>Well, I'm pretty confident that load under HP-UX and under Linux were at
>>least originally the same. Basically, load the average number of
>>processes in the runqueue during the given intervals of time. I'm
>>pretty sure both HP-UX and Linux use this same basic definition.
>>
>>
>
>This is not the definition Linux uses.
>
>In Linux, the load average is the average number of
>processes in the runqueue PLUS the average number of
>processes waiting on disk IO.
>
>This has been the meaning of load average on Linux
>since a very long time, and I would not be surprised
>if some other Unix systems use the same definition.
>
>
>
Unless it's changed last time I looked, it's the same as HP/UX then.
Short-term I/O wait processes stay on the run queue and this count
towards the load average. The calculation is inherited from BSD 4.2
(or 4.1?) and seems to have remained unchanged in all BSD's ancestors
(and presumably copied into Linux).
jch
jch
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