topic Re: CPU loop in Operating System - OpenVMS

CPU loop

Mulder_1 — Mon, 02 Feb 2009 10:05:35 GMT

How to find out in which address space is the CPU looping (system space, program space or between the 2) ?

thanks

Re: CPU loop

Jan van den Ende — Mon, 02 Feb 2009 12:27:08 GMT

Mulder,

do a
$ SHOW PROC/CONT/ID=
then type V for a dynamic show of current addresses.

Addresses below %X80000000 are process space, above is system space

HELP is your friend (here HELP SHOW PROC/CONT)

Proost.

Have one on me.

jpe

Re: CPU loop

Volker Halle — Mon, 02 Feb 2009 13:15:40 GMT

Mulder,

welcome to the OpenVMS ITRC forum.

If you have a recent version of OpenVMS (V7.3-2 or higher), you can also use the PCS$SDA extension to capture PC samples in the running system.

$ ANAL/SYS
SDA> PCS ! contain brief help
SDA> PCS LOAD
PCS$DEBUG load status = 00000001
SDA> pcs start trace
Sampling started...
SDA> pcs stop trace
Sampling stopped...
SDA> pcs sho trace
...
SDA> PCS UNLOAD
SDA> EXIT

This can be used for looping processes as well, e.g. if you just capture PC sampels from a given process ID.

Volker.