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.
The trial and error approach will work, of course, if there is no other
options available. but the downside is that that it takes time (while
the system is down) and possibly several iterations to get it
right....my opinion is that it the workload is worth running on Linux
under VM, it's worth measuring an tuning correctly.
Have a good weekend everyone.
DJ
Adam Thornton wrote:
On Mar 16, 2007, at 1:37 PM, James Melin wrote:
I can live with that. Add up the individual instances and so forth.
Was hoping there was some means to aggregate it. But I didn't make
that clear. ps
and top are old friends.
Learn about grep, sed, and awk. You can create your own customized
report with a shell script by filtering on process name, then
selecting the correct field showing size, then adding those fields
together. Kind of a pain, but not really that hard.
Adam
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