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09-10-2014 04:45 AM
09-10-2014 04:45 AM
High memory utilization//need to tune
hi experts !!
my systems (rx6600-hpuxv3) having high memory utization. please help me to tune the memory utilization. sharing some output from one db host . please let me know which info you need for good solutins,
Glance 11.00.044 17:45:42 dcpdb2 ia64 Current Avg High
------------------------------------------------------------------------------------------------------------------------------------
CPU Util SSU U | 7% 6% 11%
Disk Util FF | 2% 3% 14%
Mem Util S SU UF F | 95% 95% 95%
Swap Util U UR R | 43% 43% 43%
------------------------------------------------------------------------------------------------------------------------------------
MEMORY REPORT Users= 1
Event Current Cumulative Current Rate **bleep** Rate High Rate
--------------------------------------------------------------------------------
Page Faults 1006 48649 189.8 126.6 571.4
Page In 480 41 90.5 0.1 265.3
Page Out 0 0 0.0 0.0 0.0
KB Paged In 0kb 164kb 0.0 0.4 21.2
KB Paged Out 0kb 0kb 0.0 0.0 0.0
Reactivations 0 0 0.0 0.0 0.0
Deactivations 0 0 0.0 0.0 0.0
KB Deactivated 0kb 0kb 0.0 0.0 0.0
VM Reads 0 17 0.0 0.0 0.7
VM Writes 0 0 0.0 0.0 0.0
Total VM : 20.1gb Sys Mem : 4.7gb User Mem: 13.5gb Phys Mem : 24.0gb
Active VM: 10.9gb Buf Cache: 0mb Free Mem: 1.2gb FileCache: 4.5gb
MemFS Blk Cnt: 0 MemFS Swp Cnt: 0
========================
root@dcpdb2 [/tmp/morshed]# ./kmeminfo -static
tool: kmeminfo 7.09 - HP CONFIDENTIAL
unix: /stand/vmunix 11.31 64bit IA64 on host "dcpdb2"
core: /dev/kmem live
link: Wed Jul 25 11:33:56 EDT 2012
boot: Tue Apr 8 09:25:24 2014
time: Wed Sep 10 17:49:23 2014
nbpg: 4096 bytes
----------------------------------------------------------------------
Physical memory usage summary (in page/byte/percent):
Physical memory = 6283593 24.0g 100%
Free memory = 273898 1.0g 4%
User processes = 0 0.0b 0% details with -user
System = 64 256.0k 0%
Kernel = 0 0.0b 0% kernel text and data
Dynamic Arenas = 316354 1.2g 5% details with -arena
vm_alias_table_ = 35483 138.6m 1%
vx_global_kmcac = 34806 136.0m 1%
spinlock_arena = 30899 120.7m 0%
vm_pfn2v_arena = 24920 97.3m 0%
BTREE_NODE_OLA_ = 17575 68.7m 0%
Other arenas = 172671 674.5m 3% details with -arena
Super page pool = 414552 1.6g 7% details with -kas
Static Tables = 367482 1.4g 6% details with -static
pfdat = 306816 1.2g 5%
vhpt = 32768 128.0m 1%
text = 9116 35.6m 0% vmunix text section
inode = 7616 29.8m 0%
bss = 6762 26.4m 0% vmunix bss section
Other tables = 4402 17.2m 0% details with -static
Buffer cache = 30 120.0k 0% details with -bufcache
UFC file mrg = 1196877 4.6g 19%
UFC meta mrg = 34 136.0k 0%
----------------------------------------------------------------------
System tables:
pfdat = 306816 1.2g 5%
vhpt = 32768 128.0m 1%
text = 9116 35.6m 0% vmunix text section
inode = 7616 29.8m 0%
bss = 6762 26.4m 0% vmunix bss section
data = 2057 8.0m 0% vmunix data section
ncache = 1400 5.5m 0%
nbuf = 512 2.0m 0% bufcache headers
nc_hash = 256 1.0m 0%
pfn2v_array = 128 512.0k 0%
bufhash = 16 64.0k 0% bufcache hash headers
nc_lru = 10 40.0k 0%
sextmap = 3 12.0k 0%
spu_info[7].pdkptr = 2 8.0k 0%
spu_info[6].pdkptr = 2 8.0k 0%
spu_info[5].pdkptr = 2 8.0k 0%
spu_info[4].pdkptr = 2 8.0k 0%
spu_info[3].pdkptr = 2 8.0k 0%
spu_info[2].pdkptr = 2 8.0k 0%
spu_info[1].pdkptr = 2 8.0k 0%
io_mem_tbl = 1 4.0k 0%
root@dcpdb2 [/tmp/morshed]#
Regards,
Morshed.
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09-10-2014 08:15 AM
09-10-2014 08:15 AM
Re: High memory utilization//need to tune
Before you think about "tuning" your memory utilization (which you can't really do) you first have to understand what processes are using the memory.
According to glance the majority of your memory usage appears to be in the user space, which means user processes. If you are running a database, like Oracle, then the Oracle SGA and other areas will be counted among this.
Keep in mind that 95% memory usage is not necessarily a bad thing. You have paid for and installed the memory, so why not use it? Now high memory usage CAN be a bad thing if you are constantly hitting the 100% mark and then paging out to disk on a regular basis.
Are you paging out to disk? What does 'swapinfo -tam' show?
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09-10-2014 08:53 PM
09-10-2014 08:53 PM
Re: High memory utilization//need to tune
Hi patrick !!
thanks for the feedback. actullay alarming is migration is going on here. only 10% user migrated to this system. soon many others users will use this system. what will happen then ? yes that was from DB server. RAC is configured. my applicaton server also using more mermoy. output below: i actually need to know who is actullay using this memroy and is it normal ?
output from DB server:
root@dcpdb2 [/]# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 32768 14 32754 0% 0 - 1 /dev/vg00/lvol2
reserve - 18955 -18955
memory 23345 4923 18422 21%
total 56113 23892 32221 43% - 0 -
output from app:
Glance 11.00.044 09:39:21 dcpapp01 ia64 Current Avg High
------------------------------------------------------------------------------------------------------------------------------------
CPU Util | 1% 2% 5%
Disk Util F | 1% 2% 3%
Mem Util S SU UF F | 75% 75% 75%
Swap Util U UR R | 25% 25% 25%
------------------------------------------------------------------------------------------------------------------------------------
MEMORY REPORT Users= 3
Event Current Cumulative Current Rate **bleep** Rate High Rate
--------------------------------------------------------------------------------
Page Faults 588 3330 113.0 45.8 292.8
Page In 161 48 30.9 0.6 41.7
Page Out 0 0 0.0 0.0 0.0
KB Paged In 0kb 192kb 0.0 2.6 135.2
KB Paged Out 0kb 0kb 0.0 0.0 0.0
Reactivations 0 0 0.0 0.0 0.0
Deactivations 0 0 0.0 0.0 0.0
KB Deactivated 0kb 0kb 0.0 0.0 0.0
VM Reads 0 0 0.0 0.0 0.0
VM Writes 0 0 0.0 0.0 0.0
Total VM : 1.7gb Sys Mem : 8.5gb User Mem: 954mb Phys Mem : 24.0gb
Active VM: 1.3gb Buf Cache: 0mb Free Mem: 6.0gb FileCache: 8.6gb
MemFS Blk Cnt: 0 MemFS Swp Cnt: 0
root@dcpapp01 [/]# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 16384 0 16384 0% 0 - 1 /dev/vg00/lvol2
reserve - 1218 -1218
memory 23345 8532 14813 37%
total 39729 9750 29979 25% - 0 -
Regards,
Morshed.
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09-10-2014 10:13 PM
09-10-2014 10:13 PM
Re: High memory utilization//need to tune
HI ,
filecache=8.7 gb.
can i reduce this.
FYI,
filecache_max Auto 12239650816 - 12239650816 74.5% fs_bufcache
filecache_min Auto 1223962624 - 1223962624 - fs_bufcache
Regards,
MOrshed.
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09-11-2014 01:37 AM
09-11-2014 01:37 AM
Re: High memory utilization//need to tune
>filecache=8.7 gb. can I reduce this?
Yes but no need to do that. The OS will automatically reduce the cache when it needs memory.