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тАО06-11-2009 02:23 AM
тАО06-11-2009 02:23 AM
high kernel memory usage
I have server run hp-ux 11.31 that have high kernel memory usage.
# kmeminfo
tool: kmeminfo 9.07 - libp4 9.349 - libhpux 1.241 - HP CONFIDENTIAL
unix: /stand/current/vmunix 11.31 64bit IA64 on host "mrsapdb2"
core: /dev/kmem live
link: Sat Jun 21 14:04:45 SST 2008
boot: Mon Jun 1 22:53:49 2009
time: Thu Jun 11 10:31:24 2009
nbpg: 4096 bytes
----------------------------------------------------------------------
Physical memory usage summary (in page/byte/percent):
Physical memory = 4186441 16.0g 100%
Free memory = 373178 1.4g 9%
User processes = 2772798 10.6g 66% details with -user
System = 865819 3.3g 21%
Kernel = 865773 3.3g 21% kernel text and data
Dynamic Arenas = 469713 1.8g 11% details with -arena
btree_chunk_are = 111539 435.7m 3%
vx_global_kmcac = 40276 157.3m 1%
spinlock_arena = 33868 132.3m 1%
FCACHE_ARENA = 24994 97.6m 1%
vx_inode_kmcach = 24096 94.1m 1%
Other arenas = 234940 917.7m 6% details with -arena
Super page pool = 71310 278.6m 2% details with -kas
UAREA's = 9808 38.3m 0%
Static Tables = 263018 1.0g 6% details with -static
pfdat = 204416 798.5m 5%
vhpt = 32768 128.0m 1%
text = 9915 38.7m 0% vmunix text section
inode = 7616 29.8m 0%
bss = 4849 18.9m 0% vmunix bss section
Other tables = 3452 13.5m 0% details with -static
Buffer cache = 46 184.0k 0% details with -bufcache
UFC file mrg = 118373 462.4m 3%
# kctune |grep ninode
ninode 34816 34816
vx_ninode 65000 65000 Immed
how to reduce memory used by kernel ?
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тАО06-11-2009 07:15 AM
тАО06-11-2009 07:15 AM
Re: high kernel memory usage
If you really want to reduce kernel memory use, you would have to reduce certain parameters.
kctune -l
This is dangerous, because there might be a very good reason where settings are now.
Perhaps take a look at kernel high water marks from Glance/gpm before making any changes. Also check the kernel minimums from your applications. Oracle needs its kernel parameters.
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Owner of ISN Corporation
http://isnamerica.com
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тАО06-11-2009 05:09 PM
тАО06-11-2009 05:09 PM
Re: high kernel memory usage
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тАО06-14-2009 08:10 AM
тАО06-14-2009 08:10 AM
Re: high kernel memory usage
Tunable Current Usage Current Setting
filecache_max 485322752 489313197
maxdsiz 67108864 1073741824
maxdsiz_64bit 23068672 4294967296
maxfiles_lim 886 4096
maxssiz 786432 134217728
maxssiz_64bit 786432 1073741824
maxtsiz 35864576 100663296
maxtsiz_64bit 318767104 1073741824
maxuprc 54 4096
max_thread_proc 37 1100
msgmni 2 4096
msgtql 0 4096
nflocks 904 4096
ninode 2689 99816
nkthread 610 8416
nproc 262 4200
npty 0 60
nstrpty 8 60
nstrtel 0 60
nswapdev 2 32
nswapfs 0 32
semmni 27 4096
semmns 832 8192
shmmax 9797902336 12884901888
shmmni 12 4096
shmseg 3 512
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тАО06-14-2009 01:24 PM
тАО06-14-2009 01:24 PM
Re: high kernel memory usage
If you start messing around with these, your performance may degrade.
A good starting point is checking the latest installaton guides of your OS and application. Also sometimes latest memory patches could make a difference in how the memory is managed by your system, specially the "vm cumulative patch". Consider installing the latets Quality Patch Bundle.
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тАО06-15-2009 12:26 AM
тАО06-15-2009 12:26 AM
Re: high kernel memory usage
The above output of the memory utilization shows as below
1) The physical memory shows as 100% , OUt of which
a) User processes@66%
so its always not necessary your kernel is using more memory .
Are you running any Database/sybase Application on this server .
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тАО06-15-2009 01:26 AM
тАО06-15-2009 01:26 AM
Re: high kernel memory usage
It doesn't look reasonable to reduce kernel mem usage there.
dynamic arena reasonably are already at the min 11%
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тАО06-15-2009 02:37 AM
тАО06-15-2009 02:37 AM
Re: high kernel memory usage
Unless you have a definite problem, I wouldn't go changing things.
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тАО06-15-2009 03:03 AM
тАО06-15-2009 03:03 AM
Re: high kernel memory usage
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тАО10-06-2009 07:26 AM
тАО10-06-2009 07:26 AM
Re: high kernel memory usage
HPUX 11.31 IA64Bit 16Gb Physical Memory
Running Oracle RAC
Sys: 5.9gb User: 8.5gb Free: 878mb
there are page outs at this time, however my fear is if i do not get a good handle on memory usage my system may get into performance issues.