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Turn OFF CPU Affinity on Itanium OVMS 8.2

 
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Paul Goslin
Advisor

Turn OFF CPU Affinity on Itanium OVMS 8.2

Programmer has requested I turn off CPU affinity , they wrote:
working with a customer on a problem and need to test on ARCHER with the affinity off.

CPU 0 has affinity set in the bindings:

Bindings:
DECW$SERVER_0 PID = 00001036 Reason: Affinitized to this CPU
----------------------------
How do I turn this OFF ? or even see it ?
4 REPLIES 4
Robert Gezelter
Honored Contributor

Re: Turn OFF CPU Affinity on Itanium OVMS 8.2

Paul,

Check the HELP text for SET PROCESS/AFFINITY. The correct online documentation can be found in the DCL Dictionary (currently, the SET PROCESS command can be found at http://h71000.www7.hp.com/doc/83final/9996/9996pro_209.html#brass_78 ) on the OpenVMS www site at http://www.hp.com/go/openvms .

A cautionary note is in order to also check the DECwindows documentation to see the precise reason it has affinity set to CPU 0.

- Bob Gezelter, http://www.rlgsc.com
Hoff
Honored Contributor

Re: Turn OFF CPU Affinity on Itanium OVMS 8.2

Do ask your programmer what is needed when presented with this. As a rule, we're further removed from the intended request than you are.

Closing the loop with the programmer making the request is usually faster than using ITRC, as you'll now have to back-determine if I've given the right answer for the particular context.

The basic command for scheduling-level affinity (there are a couple of confusingly-named constructs here that share the "affinity" naming) is built on the command:

SET PROCESS /[NO]AFFINITY/PERMANENT

What you're showing is a cut-down version of the output from the command:

SHOW CPU/FULL 0

where the parameter s the CPU number.

Check the HELP libraries and the OpenVMS manuals and Google for some additional details on these commands, and on scheduling-level affinity.

I'd probably poke around the system startup files looking for "AFFINITY" and such, and would discuss what's going on here with the programmer. As was mentioned.

Volker Halle
Honored Contributor
Solution

Re: Turn OFF CPU Affinity on Itanium OVMS 8.2

Paul,

to turn off affinity of the DECW$SERVER_0 process to CPU 0, you could use the following command (based on your SHOW CPU/FULL output):

$ SET PROC/AFF/PERM/ID=00001036/CLEAR=0

Volker.
Paul Goslin
Advisor

Re: Turn OFF CPU Affinity on Itanium OVMS 8.2

Thank you all for your suggestions, tips... etc...

We have resolved this issue for now.