topic Re: about swapinfo! in Operating System - HP-UX

about swapinfo!

leyearn — Wed, 23 Apr 2003 05:40:17 GMT

now there is some description about swapinfo:

Kb FREE The amount of space that can be used for future paging. Usually this is the difference between
Kb AVAIL and Kb USED. There could be a difference if some portion of a device paging area
is unusable, perhaps because the size of the paging area is not a multiple of the allocation
chunk size, or because the tunable parameter maxswapchunks is not set high enough.
but I can't understand the "chunk size"
what's the meaning of the "chunk size"?

Re: about swapinfo!

Michael Tully — Wed, 23 Apr 2003 06:01:31 GMT

The chunk size is actually 2Mb.

There is a complete document on this.
/usr/share/doc/mem_mgt.txt

Also have a look at the kernel pages for 'maxswapchunks' and 'swchunk'

http://www.docs.hp.com/hpux/onlinedocs/939/KCParms/KCparam.MaxSwapChunks.html

Re: about swapinfo!

Karvendhan M — Wed, 23 Apr 2003 06:03:11 GMT

I guess "chunk size" is the one unit to r/w to swap area.

see the kernel parameter help on sam.

http://www.ussg.iu.edu/hp/hpux-tune.html#maxswapchunks

~ Kars

Re: about swapinfo!

Khalid A. Al-Tayaran — Wed, 23 Apr 2003 06:08:31 GMT

Hi,

Imagine a chenk as an allocation unit. When the system allocates a chunk it allocates a number of byte in memory that corresponds to that chunk.

What is the application that your are using that requires a maxswapchunks value?? Oracle/SAP/MQ Series ?? Read the software manuals to determine the right kernel paramaters...

Use swapinfo -tam to get the swap size in megs..

Re: about swapinfo!

leyearn — Wed, 23 Apr 2003 06:46:44 GMT

to Khalid
allocating a chunk means the system will allocate a number of memory?