On Tuesday, 08/24/2004 at 07:35ZE5B, Taraka Srinivas Kumar <[EMAIL PROTECTED]> wrote: > Yeah. But still i want to show some value which represents the CPU capacity > configuration of the machine. > Does /proc/sysinfo throw any useful information ?
Irrelevant. The CPU capacity of the machine may or may not be available for use by a virtual machine. There are settings (LPAR "weights" and z/VM "shares") that affect how much of the physical capacity *may* be used. While it is possible to dedicate ALL of the resources the mainframe has to a single Linux image, no one will, so trying to calculate the ratio of "used" to "theoretical maximum" is also meaningless. Given a shared environment, the amount of available CPU is affected by what other LPARs and virtual machines are doing, there is no meaningful calculation that you can make. You might show an "effective" rate of 300MHz one instant and 1GHz the next (just examples). A single virtual machine is simply unaware (by design) of the larger picture. To complicate things further, the CPU is not the only workhorse on a mainframe. The I/O subsystem has its own processors that handle moving data between memory and the devices. The clock rate of the CPU does not give an accurate picture of how much work is flowing through the box. If people just wanted to use MHz numbers to compare raw clock rates or to decide whether to have Wendy's (even) or McDonald's (odd) for lunch, there wouldn't be an issue. But, alas, people use the clock rate as a mystical prognosticator of system performance. (I recommend you don't use bogomips to do retirement planning, either.) :-) Alan Altmark Sr. Software Engineer IBM z/VM Development ---------------------------------------------------------------------- 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
