psradm equivalent on HPUX

[Gene L. Huft]

Gurus, Solaris has a command called psradm that allows you to disable/enable CPU's on the fly. What is the HPUX 11i equivalent?

Thanks in advance!

--Gene

[Michael Tully · Accepted solution]

On a standard machine this is not possible. It has to be done from the 'GSP' (guardian service processor) from the console Using control+b and then a system reboot.(I am not sure if you can do this on a superdome on the fly) If a CPU dies some of the later systems will continue to function with one less CPU.

[Gene L. Huft]

Thanks for the info, too bad HP doesn't have something like that....but actually I've got an 8400 & I guess I can accompish my mission - (which is just to run some perf tests at different resource levels) - from the partition manager via sam and/or from the MP> console, running the partition commands. If I start with 16 procs, run a test, capture results, then remove a cell w/ 4 procs, run new test on 12 procs, drop to 8, test...then 4 procs, test..etc.

[rick jones]

The nearest analog to the psradm command of Solaris would probably be some of the iCOD stuff, perhaps in combination with intctl. maybe some psets stuff too.

iCOD can enable/disable CPUs (instant Capacity On Demand)

intctl can move the interrupts of an I/O card from one CPU to another

psets can be used to restrict apps to a set of CPUs (doesn't affect the kernel though).

I _believe_ you will need to install patches and/or bits from software.hp.com to get the intctl and psets stuff for 11i v1, honestly, I'm not sure how/where one gets the iCOD stuff.

since you mention the 8400, there may be some differences depending on how you select CPUs from among the cells - two cells each with two CPUs may not perform exactly the same as one cell with four CPUs, that sort of thing.

[James A. Donovan]

As long as you have more than one cell board, take a look at using VPAR's (virtual partitions). Using the vparmodify command, you'll be able to add/subtract CPU's on-the-fly.

http://www.docs.hp.com/hpux/onlinedocs/T1335-90018/T1335-90018.html