RE: Solaris CPU Consumption
- From: "Kevin Closson" <kevinc@xxxxxxxxxxxxx>
- To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 30 Jan 2006 07:55:22 -0800
>>>The problem is your assumption about the CPU time
>>>accounting. On Unix, and Solaris can certainly be regarded
>>>as such, there are 3 types of state that CPU can be in:
...processors execute the idle loop too and that is
neither user nor kernel...just fyi
>>>1) User mode, working on a user process. There is no problem with
>>> accounting for that time.
>>>2) Kernel mode, when the CPU is processing a system call
>>> on behalf of a process which invoked the system call.
>>>3) Interrupt stack, when the CPU is servicing an external
>>> interrupt, coming from some device, outside of a process
>>> context. That means that not a single process is charged
>>> with the CPU time servicing clock interrupt or NIC interrupts.
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