Hello,
Thanks for your explanation ! I'm sorry to insist but it's a bit hard to understand. I think the true problem is the "reserved" memory. It's a maximum value and may not be used totally. For me, the real information is on the first line and given by the swapdisk. In my example, I got a total of 24G for swapping (also called paging by HP) and only 23% is used. Moreover, to determine the total physical memory used, a little script called "hpux_memory" is launched. I got very different results between this script and "swapinfo -Mm" :
bash-3.00$ ./hpux-meminfo Total:16372
Free:212
So, on my hobbit display I got percentage of memory utilisation > 95% whereas I got 29% with the other command !! Where is the truth ?!
bash-3.00$ /usr/sbin/swapinfo -Mm
Mb Mb Mb PCT
TYPE AVAIL USED FREE USED
memory 16372 4770 11602 29%
For the swap or paging memory, "swapinfo -dm" :
bash-3.00$ /usr/sbin/swapinfo -dm
Mb Mb Mb PCT Mb
TYPE AVAIL USED FREE USED START RESERVE PRI NAME
dev 24000 7264 16736 30% 0 - 1 /dev/vg00/lvol2
I got several servers with two or more swapdisks, so this command may be launched :
psu106:/# /usr/sbin/swapinfo -dtm
Mb Mb Mb PCT Mb
TYPE AVAIL USED FREE USED START RESERVE PRI NAME
dev 8192 4906 3286 60% 0 - 1 /dev/vg00/lvol2
dev 8192 4908 3284 60% 0 - 1 /dev/vg00/lvol3
dev 6144 5735 409 93% 0 - 0 /dev/vg_swap/lv_swap01
total 22528 15549 6979 69% - 0 -
If you can explain me where I'm wrong I would greatly appreciate ! Thanks again !
Sincerly,
Thomas
"lars ebeling" <user-1fecd3eafd52@xymon.invalid> a écrit sur 25/07/2006 18:05:31 :
From: <user-bb3e9041f07f@xymon.invalid>
To: <user-ae9b8668bcde@xymon.invalid>
Sent: Tuesday, July 25, 2006 2:34 PM
Subject: [hobbit] Important ! HP-UX and the memory utilisation
Hello,
I got some troubles with HPUX and memory values. With Hobbit, in my
memory
test, I got this :
Memory Used Total Percentage
Physical 16156M 16372M 98%
Swap 22117M 40372M 54%
Everything seems normal but for me, these numbers are high 'cause this
server does nothing during the day. So, I connected to the server and ran
this command to see the available memory :
psd216:~# swapinfo -atm
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 24000 5474 18526 23% 0 - 1
/dev/vg00/lvol2
reserve - 11550 -11550
memory 16372 4754 11618 29%
total 40372 21778 18594 54% - 0 -
This output clearly shows an error in the Hobbit display. If you look, my
total swap memory is equal to 24000M not 40372M as shown in Hobbit and
only 23% is used !! Apparently, the values for the swap memory test
are
taken from the last line and that's not correct !
Then I tried to execute the binary called "hpux-meminfo" in the client
"bin" directory and I get this :
The 24000M is not swapmemory it is swapdisk, ie diskdevice configured to be used for swap.
The 16372 is swapmemory or pseudo-swap as HP name it. It is a part of
memory
that could be used used for swapping (or as I prefer paging). If you
have a
lot of memory it is more efficient to use memory for paging. When a
process
is started in HP-UX swapdisk is reserved for the process (reserve
above). If
that swap isn't used, it's is waste of diskresources.
It is a try to explain.
Regards
Lars Ebeling
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