System Memory usage is too high in HPUX 11.23

[Pradeep_kumar_1]

I have a server running on HPUX 11.23 with a memory of 103 GB. In this server system memory usage is 18 GB. I am very much worried about this number in system memory area.

Can some one please help me out in understanding the problem. kmeminfo outout from the server is displayed below.





./kmeminfo
tool: kmeminfo 8.01 - libp4 9.314 - HP CONFIDENTIAL
unix: /stand/current/vmunix 11.23 64bit IA64 on host "SP01UG01"
core: /dev/kmem live
link: Mon May 04 21:57:20 IST 2009
boot: Wed May 12 02:31:26 2010
time: Wed Oct 6 10:50:57 2010
nbpg: 4096 bytes


----------------------------------------------------------------------
Physical memory usage summary (in page/byte/percent):

Physical memory = 26987998 103.0g 100%
Free memory = 8332670 31.8g 31%
User processes = 9688042 37.0g 36% details with -user
System = 8908785 34.0g 33%
Kernel = 4860586 18.5g 18% kernel text and data
Dynamic Arenas = 2846521 10.9g 11% details with -arena
vx_global_kmcac = 1425280 5.4g 5%
spinlock = 314565 1.2g 1%
vx_rwsleeplock_ = 212880 831.6m 1%
vx_buffer_kmcac = 186656 729.1m 1%
vm_pfn2v_arena = 105800 413.3m 0%
Other arenas = 601340 2.3g 2% details with -arena
Super page pool = 357782 1.4g 1% details with -kas
Static Tables = 1392618 5.3g 5% details with -static
pfdat = 632544 2.4g 2%
nbuf = 521952 2.0g 2% bufcache headers
vhpt = 131072 512.0m 0%
bufhash = 65536 256.0m 0% bufcache hash headers
bufmap = 13177 51.5m 0% bufmap->bm_bitmap
Other tables = 28336 110.7m 0% details with -static
Buffer cache = 4048199 15.4g 15% details with -bufcache
UFC meta mrg = 0 0.0 0%
UFC file mrg = 0 0.0 0%





Any help will be appreciated and of grt help to me...

[Michal Kapalka (mikap)]

Hi,

check the "HP-UX Performance Cookbook" :

http://h21007.www2.hp.com/portal/download/files/unprot/devresource/Docs/TechPapers/UXPerfCookBook.pdf

mikap

[likid0]

You have 15 gigs in the data buffer cache.

If you don't want all this memory in the dbc, change the kernel parameters(they are dinamyc):

dbc_max_pct
dbc_min_pct

something like 3% will give you 3 gigs of dbc in most cases more than enough, but it depends on your application behaviour

[Pulse001]

Hi Pradeep,

Your buffer cache is 15.4 gb. In reality you dont need such a huge buffer cache, buffer cache of 2-4 gb will be ok for you.

You can reduce the dynamic buffer cache by changing dbc_max_pct value.

# kctune dbc_max_pct=3

This will set your buffer cache to approx 3gb