topic Re: vhand in Operating System - HP-UX

vhand

Sandip Ghosh — Wed, 13 Feb 2002 15:18:48 GMT

What does the vhand process do?

Thanks in advance
Sandip

Re: vhand

harry d brown jr — Wed, 13 Feb 2002 15:21:04 GMT

paging

http://www.docs.hp.com//hpux/onlinedocs/os/11i/mem_mgt.html#vhand,%20the%20pageout%20daemon

live free or die
harry

Re: vhand

Ian Dennison_1 — Wed, 13 Feb 2002 15:23:09 GMT

"The vhand process is responsible for Management of Memory Availability" (taken from the HP-UX Memory Management whitepaper).

In brief, it is responsible for freeing up memory by paging it out.

If you would to learn more, look for the Whitepaper on the forums here.

Cheers, Ian Dennison

Re: vhand

Helen French — Wed, 13 Feb 2002 15:23:41 GMT

Hi,

Check this out:

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/5965-4641/5965-4641_top.html&con=/hpux/onlinedocs/5965-4641/00/00/11-con.html&toc=/hpux/onlinedocs/5965-4641/00/00/11-toc.html&searchterms=vhand&queryid=20020213-072921

HTH,
Shiju

Re: vhand

Sanjay_6 — Wed, 13 Feb 2002 15:24:26 GMT

Hi Sandip,

"vhand" is the swapper process that handles the normal paging mechanism. It is the "swapper", the process that swap pages to and from between swap and memory.

hope this helps.

Regds

Re: vhand

Patrick Wallek — Wed, 13 Feb 2002 15:24:35 GMT

If you are seeing vhand useing a lot of CPU time, then you are not going to get much done on your machine. vhand is the process that controls swapping of pages from memory to the swap area on disk. If it is using lots of CPU then you are doing lots of swapping and it is time for more RAM for this machine.

Re: vhand

James George_1 — Wed, 13 Feb 2002 15:26:33 GMT

vhand daemon handles the paging requirements and memory clearence. It decides when to page and takes care of the memory by clearing its references. It depends on couple of factors ..sorry don't remeber anything now.

Rgds / James

Re: vhand

harry d brown jr — Wed, 13 Feb 2002 15:27:01 GMT

Sandip,

If it's consuming a lot of cpu, look at this:

http://us-support3.external.hp.com/cki/bin/doc.pl/screen=ckiDisplayDocument?docId=200000043976223
live free or die
harry

Re: vhand

Sanjay_6 — Wed, 13 Feb 2002 15:27:27 GMT

Hi Sandip,

If you see "vhand" consuming a lot of system time, you should reduce the value of the kernel parameters, dbc_min_pct and dbc_max_pct Your dbc_max_pct was probably set at the default value of 50%, so it is consuming half of your RAM over time, thus slowing performance and using memory.

Hope this helps.

Regds

Re: vhand

Marcin Wicinski — Wed, 13 Feb 2002 15:29:55 GMT

Hi,
vhand process is responsible for performing paging tasks.

Re: vhand

Helen French — Wed, 13 Feb 2002 15:34:47 GMT

Hi,

Also, Check this out:

http://www.docs.hp.com//hpux/onlinedocs/os/11i/mem_mgt.html#pregion elements used by vhand

HTH,
Shiju

Re: vhand

Sandip Ghosh — Wed, 13 Feb 2002 16:17:15 GMT

Hi All,

Thanks everybody for your replies.

Sandip