On Mar 16, 2007, at 6:55 PM, Dave Jones wrote:
As Adam mentions, grep, sed and awk are very good Linux tools for extracting performance data and massaging it into nice looking reports. Unfortunately, the numbers in these nice looking reports will be completely *wrong*. Linux has not a clue that it is in fact running on top of a hypervisor (in this case, z/VM) so all processor utilization values will be incorrect. In addition, how Linux computes the total process memory, while a reasonable approach for and Intel-based, standalone environment, is completely misleading when used in a VM environment. The simple fact is that a good external performance monitor is needed to collect reliable and accurate Linux data; and this is true regardless of the virtualization environment being employed: z/VM, VMWare, Xen, etc.
He's asking about how to measure the footprint of his httpd processes inside Linux. I submit that summing these will tell him how much Linux thinks it's using, and that will in turn be a good metric for how much virtual storage the guest should have, as he basically wants to give his Linux guest enough breathing room to run those processes without swapping much if at all. The fact that that memory may or may not in fact actually exist on the host is a different issue. Adam ---------------------------------------------------------------------- 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
