Date: Wed, 25 Mar 1998 19:58:46 GMT From: roger chen <roger@roger.iecs.fcu.edu.tw> To: freebsd-questions@FreeBSD.ORG Subject: Please do me a favor, and thanks a lot. Message-ID: <199803251958.TAA00291@roger.iecs.fcu.edu.tw>
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I am so glad to write the mail to you, and thank you for spending
time to read my questions.
The commands 'uptime' and 'top' on FreeBSD both obtain three values
from the array '_averunnable' in the kernel, and then make each value
divided by FSCALE (a system constant.) as their "load agerage". One
of my questions is how those three values be generated by FreeBSD kernel.
In other words, what factors does FreeBSD kernel depend on to determine
the term "load average"??
I know the value of FSCALE on FreeBSD is 2048, because I printed the
constant in a program. And on SunOs, FSCALE is 256, right? What is "256
scale array" or "2048 scale array"? What do thay mean? And why do we
have to make the values that get from '_averunnable' divided by FSCALE?
p.s.: I know FSCALE is a kernel variable(a pointer), and it points to an
array which keeps the load values in /dev/kmem.
Please reply to "hjchen@pine.iecs.fcu.edu.tw".
Thank you very much, and have a nice day.
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