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System Memory usage is too high in HPUX 11.23

Occasional Visitor

System Memory usage is too high in HPUX 11.23

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...
3 REPLIES
Honored Contributor Honored Contributor

Re: System Memory usage is too high in HPUX 11.23

Honored Contributor

Re: System Memory usage is too high in HPUX 11.23

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
Windows?, no thanks
Regular Advisor Regular Advisor

Re: System Memory usage is too high in HPUX 11.23

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