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07-02-2012 10:00 AM
07-02-2012 10:00 AM
NBUF and BUFPAGES vs. Dynamic Buffer Cache
Hello:
I have a cluster with 4 server. Actually they are configured to use NBUF and BUFPAGES. Is better to use the DBC(Dynamic Buffer Cache) than use the NBUF and BUFPAGES? Use the DBC increase performance? Also I want to lower the SWAP utilization. Where I should start looking?
The server set up are:
# uname -a
HP-UX B.11.23 U ia64 3314175231 unlimited-user license
# sysdef | grep -i "buf"
bufpages 838445 - 0- Pages -
nbuf 4418058 - 0- -
# kctune | grep -i "dbc_"
dbc_max_pct 5 5 Immed
dbc_min_pct 2 2 Immed
# glance
Glance C.04.60.000 12:41:27 hpium3 ia64 Current Avg High
--------------------------------------------------------------------------------------------------------------------------------
CPU Util S SU U | 32% 27% 36%
Disk Util F F | 5% 6% 9%
Mem Util S SU UB B | 60% 60% 60%
Swap Util U UR R | 47% 47% 47%
--------------------------------------------------------------------------------------------------------------------------------
MEMORY REPORT Users= 2
Event Current Cumulative Current Rate **bleep** Rate High Rate
--------------------------------------------------------------------------------
Page Faults 1688 5209 366.9 248.0 391.9
Page In 0 64 0.0 3.0 66.7
Page Out 0 0 0.0 0.0 0.0
KB Paged In 0kb 256kb 0.0 12.1 89.6
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 11 0.0 0.5 1.3
VM Writes 3 6 0.6 0.2 0.6
Total VM : 34.9gb Sys Mem : 11.7gb User Mem: 23.4gb Phys Mem : 64.0gb
Active VM: 34.7gb Buf Cache: 3.2gb Free Mem: 25.7gb FileCache: na
Tips or recommendations are welcome. =)
Regards,
Elvin
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07-02-2012 01:07 PM
07-02-2012 01:07 PM
Re: nbuf and bufpages vs. Dynamic Buffer Cache
>Is better to use the DBC(Dynamic Buffer Cache) ...
It's probably much easier.
>I want to lower the SWAP utilization. Where I should start looking?
You buy more RAM or run less processes. What does "swapinfo -tam" show?
Are you running a database on this machine? Your dbc_max_pct seems small enough for that.
I don't see any page outs, so your swap is fine.
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07-05-2012 09:18 AM
07-05-2012 09:18 AM
Re: nbuf and bufpages vs. Dynamic Buffer Cache
Dennis Handly:
We are running IUM6.3 but that application have a database system using Solid. That may do a big impact on the DBC at 5% max?
This the output for the command "swapinfo -tam".
# 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 - 16384 -16384
memory 65504 22427 43077 34%
total 81888 38811 43077 47% - 0 -
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07-05-2012 05:17 PM
07-05-2012 05:17 PM
Re: nbuf and bufpages vs. Dynamic Buffer Cache
>This the output for the command "swapinfo -tam".
It looks like you have plenty of swap space at this time and you aren't actively swapping.
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07-06-2012 08:41 AM
07-06-2012 08:41 AM
Re: nbuf and bufpages vs. Dynamic Buffer Cache
Dennis:
Ok. But about the DBC. What about the values we got and the application we are running in the server. Is going to be need to increase DBC parameters?
Regards,
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07-06-2012 02:34 PM
07-06-2012 02:34 PM
Re: nbuf and bufpages vs. Dynamic Buffer Cache
>What about the values we got and the application we are running in the server. Is going to be need to increase DBC parameters?
If you have plenty of memory and you aren't using an Oracle DB, you can increase the DBC to see if it helps.