Under Linux we have the command vmstat (and others) that display the CPU usage. CPU Usage is broken into four groupings totaling 100%. I understand System and User CPU usage, and Idle is available CPU. But "wa: Time waiting for IO", is this available CPU or unusable CPU? If this number is high on a system, is this a performance issue?
On one of our systems, in PERFKIT we see the CPU at 99%. But we show CPU values at us: 21% sy: 5% id: 0% wa: 74%. Is the actual work being done by 26% of the CPU, and 74% CPU is unavailable waiting on I/O? Any performance suggestions? James Chaplin Systems Programmer, MVS, zVM & zLinux Base Technologies, Inc (703) 921-6220 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
