topic Re: vhand in Operating System - HP-UX

vhand

jim bidebo — Tue, 15 Jan 2002 10:55:37 GMT

vhand takes 100% cpu, is that a sign that the machine doesnt have enough physicalmemory?

is there any know bugs in vhand? (that makes it take all the cpu time?)

Re: vhand

Steven Sim Kok Leong — Tue, 15 Jan 2002 11:20:24 GMT

Hi,

Take a look at these:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x2652af48a9e5d5118ff40090279cd0f9,00.html

http://forums.itrc.hp.com/cm/QuestionAnswer/1,11866,0x2d01c7af36b7d5118ff10090279cd0f9,00.html

Hope this helps. Regards.

Steven Sim Kok Leong

Re: vhand

Frank Slootweg — Tue, 15 Jan 2002 11:37:07 GMT

> vhand takes 100% cpu, is that a sign that the machine doesnt have enough physicalmemory?

Probably. See the threads Steven mentioned (one of them is yours with the same question! :-().

Do you have Glance? If so, what does "Mem Util"? say. If not, why not? :-)

> is there any know bugs in vhand? (that makes it take all the cpu time?)

(Depending on the release, etc.,) May be there has been. Make sure that you are up-to-date on patches.

Re: vhand

Marcin Wicinski — Tue, 15 Jan 2002 11:39:52 GMT

Hi,
If vhand utilizes 100% of CPU it means there is a serious lack of memory.
Adding more swap space should help but adding more phisical memory would be more convenient.
Later,

Re: vhand

Tim D Fulford — Tue, 15 Jan 2002 14:56:41 GMT

In addition to some of the comments above. You should really make
swap = phys_mem + kernel.
but as a sensible minimum swap=phys_mem is OK

If you do not you risk
o incomplete system crash dumps, so HP can't analyse them
o performance problems when you need more swap

just my 0.02???

Tim

Re: vhand

Sridhar Bhaskarla — Tue, 15 Jan 2002 15:01:40 GMT

Hi Jim,

Yes. Do a vmstat and look at your free and po.
free is the number of free pages (x4=the available memory) - Shouln't be less and po - pageouts shouldn't be more. Also look at your swapinfo -t and check the kb used column on the swap devices (not the reserve one). If you find good amount of %used, then you are doing paging and time for you to buy more memory. Adding swap will not do good.

-Sri

Re: vhand

Patrick Wallek — Tue, 15 Jan 2002 15:03:34 GMT

If vhand is 100%, then I can almost guarantee that you have run out of RAM and you are doing some serious swapping. Your machine is probably not getting any real work done because it is swapping so much.

I would highly recommend getting more memory for your machine. Memory is cheap!!! Not getting any work done is expensive!

Re: vhand

Deshpande Prashant — Tue, 15 Jan 2002 15:15:42 GMT

HI
Yes, free memory shortage. vhand is too busy moving data between disk and memory.

Also check/lower your dbc_max_pct value to recover some memory from buffers.

Thanks.
Prashant.