AIX

Hi,

Under Linux, when i do this command "ps -Aeo cpu,pcpu,args", it display the processor ID, %CPU and the full command name.

Under AIX, is there a way to do this also? When i tried to use the "cpu" in my PS command, it returned me some weird result ... 0, 1 or 120.

When I use ps -Aeo bnd,pcpu i get ALOT of "-" or some "0".

What I'd like to do is, have a list of all the processes, with the processor id and %cpu under AIX.

Thank you.

Sorry, didn't see the "edit" button

I suggest you read the manpage of "ps", as the AIX ps is quite different from the linux ps. AIX ps tries to be Berkeley- as weill as SysV-compatible (for instance "ps -fe" as well as "ps caux" both work).

The options for "-o" are described there pretty well, the "cpu" list item "determines the process scheduling priority", to quote from the manpage. What you probably are looking for is "tcpu" or "time", maybe "pcpu". If you want to know to which processor a certain process is bound you might want to consult the manpage of "bindprocessor" and probably some documentation about the "work load manager", WLM for short. Most probably you will be interested in the manpage of "lswlmconf". and "wlmstat".

I hope this helps.

bakunin

Hey,

Thank you for your reply, ill go read those manual.

I did read the ps manual for AIX. The argument that came the closest to what im looking for, is the bnd that you can use with -o.

What I'd like to be able to do is, let say my server has 2 processors (0 and 1) and the average idle is inferior to 5, it list the top 20 biggest cpu (pcpu) with which processor runs it, to display the information processor per processor.

In Linux, when you do ps -Aeo cpu,pcpu,args the result is something like:

CPU %CPU CMD
0 56.0 some command
1 43.7 some command

I think i understand what you want to achieve. Alas, this is not possible in AIX. The reason is that "processors" are not real processors any more (at least not in p-series machines) but "logical CPUs". The typical machine does not have one or more processors any more, but is an LPAR, which is entitled to use a certain maximum (and certain minimum) of physical CPUs depending on load. In such an environment it simply does not make any sense to say "process A runs on processor 3" as "processor 3" is just a virtual construct sometimes representing a physical CPU, sometimes only a part of one and sometimes nothing. Additionally threads are not bound to specific processors but are passed around as necessity dictates. If you encounter an uneven load balancing between the processor resources it is always a problem of the application (single-threaded, not multiprocessing-capable, etc.), not that of the OS.

It is possible, though, to assign specific processors (more or less exclusively ) to specific processes, via the "bindprocessor" command or with the methods of the Work Load Manager (WLM).

bakunin

Hey,

Thank you alot for the last post. I just read from IBM exactly what you just said. I was trying to do this, only to have a better looking output, in html.

For AIX, I will simply display top <nbProcess>, globaly. It makes my work easier.


Once again, thank you alot for the replys.