topic Re: how can i get all process names and topcpu using c? in Operating System - OpenVMS

how can i get all process names and topcpu using c?

likuair_1 — Wed, 11 Feb 2009 08:21:41 GMT

i just know how to use sys$getjpi or lib$getjpi when i know the process names,but i wanted to get all the running process in the system ,how can i do it using c language?

Re: how can i get all process names and topcpu using c?

Kris Clippeleyr — Wed, 11 Feb 2009 08:56:10 GMT

Hi,
You don't need the process names in order to obtain various info.
Have a look at the system services $PROCESS_SCAN and $GETJPI in the System Services Reference Manual at:
http://h71000.www7.hp.com/doc/83final/4527/4527pro.html
However, you need to be priv'ed to obtain info about processes not running under your UIC.
Regards,
Kris (aka Qkcl)

Re: how can i get all process names and topcpu using c?

Kris Clippeleyr — Wed, 11 Feb 2009 08:58:49 GMT

Hi,
I forgot...
If you're really adventurous have a look at QJPI at
http://www.quadratrix.be/qjpi.html
Regards,
Kris (aka Qkcl)

Re: how can i get all process names and topcpu using c?

Jess Goodman — Wed, 11 Feb 2009 16:31:04 GMT

$ HELP SYSTEM_SERVICE $GETJPI

Arguments

pidadr

OpenVMS usage:process_id
type: longword (unsigned)
access: modify
mechanism: by 32- or 64-bit reference (Alpha)
mechanism: by 32-bit reference (VAX)

If you give pidadr the value -1, $GETJPI assumes a wildcard
operation and returns the requested information for each process
on the system that it has the privilege to access, one process
per call. To perform a wildcard operation, you must call $GETJPI
in a loop, testing for the condition value SS$_NOMOREPROC after
each call and exiting from the loop when SS$_NOMOREPROC is
returned.

Re: how can i get all process names and topcpu using c?

likuair_1 — Thu, 12 Feb 2009 02:41:54 GMT

hello,Mr.Jess Goodman:
i can not set the pdiadr to -1 just because it's unsigned ,how can i do this?

Re: how can i get all process names and topcpu using c?

likuair_1 — Thu, 12 Feb 2009 03:05:03 GMT

sorry,i have noticed my error,thank you!

Re: how can i get all process names and topcpu using c?

Hein van den Heuvel — Thu, 12 Feb 2009 05:25:56 GMT

>> sorry,i have noticed my error,thank you!

Not your error! Sloppy parameter / dscription. It clearly indicates 'unsigned' and then tells you to put a -1 in there. Oh well.

Anyway... now that you figured it out, attached a ditty program to do a 'show process' with CSV output and CPU time columns for USER, EXEC and KERNEL.

Hein.

Re: how can i get all process names and topcpu using c?

Hein van den Heuvel — Thu, 12 Feb 2009 05:28:38 GMT

The attachment did not stick. Trying again. Hein.

Re: how can i get all process names and topcpu using c?

Ian Miller. — Thu, 12 Feb 2009 13:35:07 GMT

Note that more extensive statistics cane be obtained using SYS$GETRMI

Re: how can i get all process names and topcpu using c?

likuair_1 — Fri, 13 Feb 2009 03:30:33 GMT

hello,Mr.Hein van den Heuvel:

I just download your codes and test it,
the following is the output :

"IOMASTER",13105,1,26,386,360,569,00000C18,8,$1$DGA1:[BKMASIC.][DATA.MASIC1.RELEASE]IOMASTER.EXE;26

here we can see that the kernel time is 13105,and EXECTIME is 1,and usertime is 26,but i wanted to get the cpu using percent of the system just like using
$MONITOR PROCESS/TOPCPU
00000C18 IOMASTER 20 ,
how can i do this?

Re: how can i get all process names and topcpu using c?

likuair_1 — Fri, 13 Feb 2009 03:34:31 GMT

i am using the system function to get system informations ,so i'm also testing sys$getsyi ,i know how to get the total memory of the system using SYI$_PHYSICALPAGES,but i wanted to get total free pages,in use pages just like
$show memory,can you help me?

Re: how can i get all process names and topcpu using c?

Hein van den Heuvel — Fri, 13 Feb 2009 04:28:33 GMT

likuair,

YOU can do this.

Check out the GETJPI call in the example.
Read it twice.
The GETSYI call is very much similar.
Read up! In the manuals, or: $ help system $GETSYI

As for the 20%.... 20% of what?
A single CPU? All cpu usage?
Since beginning of time? For an iteration?

YOU can do this. If you can not, then IMHO you have no business even asking the first question.
YOU can solve this in the program, or outside in EXCEL.
You'll just need 2 (or more) measurement in a loop. Take that CPU time (in centi-seconds) subtract the prior value, multiply by 100 and divide by the centiseconds between measurements.

IF you can not handle that, call LIB$SPAWN ("SHOW SYSTEM") or similar.

btw... For mere money I'll gladly hold your hand, or do this for you.

Enjoy!
Hein