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10-31-2011 04:29 AM
10-31-2011 04:29 AM
Regarding swap memory on HP-UX server.
Hi,
I want to know how I can find the actual free physical memory in the system. When I use swapinfo –mat it shows I have 18.4GB of free physical memory. But in top it shows 5.5 GB of free physical memory. And also swap space is reserved fully i.e. 20.2GB. We have 32GB of RAM and 8 CPU. We are running SAP ECC6.0 and Oracle 10.2g Database. The swap space configured as priority one. I want to know if I change the priority of swap device file to 2 it will then use more physical memory and performance of system will improve. As currently all swap space is reserved fully. And also what is the formula to calculate the maximum swap space required for the system so that performance will improve.
Server1:[/]# swapinfo -mat
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 22 8170 0% 0 - 1 /dev/vg00/lvol2
dev 4000 22 3978 1% 0 - 1 /dev/vg00/lvswap1
dev 4096 21 4075 1% 0 - 1 /dev/vgmaxfs/lvswap2
dev 4096 21 4075 1% 0 - 1 /dev/vgmaxfs/lvswap3
reserve - 20299 -20299
memory 25498 7058 18440 28%
total 45882 27443 18439 60% - 0 -
Server1:[/]# top
System: Server1 Mon Oct 31 02:11:47 2011
Load averages: 1.01, 1.01, 0.92
376 processes: 348 sleeping, 26 running, 2 zombies
Cpu states:
CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS
0 0.88 24.8% 0.0% 33.7% 41.6% 0.0% 0.0% 0.0% 0.0%
1 0.97 30.7% 0.0% 41.6% 27.7% 0.0% 0.0% 0.0% 0.0%
2 0.94 37.6% 0.0% 24.8% 37.6% 0.0% 0.0% 0.0% 0.0%
3 1.03 21.8% 1.0% 39.6% 37.6% 0.0% 0.0% 0.0% 0.0%
4 1.05 23.8% 0.0% 38.6% 37.6% 0.0% 0.0% 0.0% 0.0%
5 1.06 100.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
6 1.06 20.8% 0.0% 40.6% 38.6% 0.0% 0.0% 0.0% 0.0%
7 1.06 21.8% 0.0% 35.6% 42.6% 0.0% 0.0% 0.0% 0.0%
--- ---- ----- ----- ----- ----- ----- ----- ----- -----
avg 1.01 34.7% 0.0% 31.7% 33.7% 0.0% 0.0% 0.0% 0.0%
Memory: 22143104K (6508996K) real, 25790364K (7640392K) virtual, 5589164K free Page# 1/14
Thanks,
Narendra
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10-31-2011 01:16 PM
10-31-2011 01:16 PM
Re: Regarding swap memory on HP-UX server.
>what is the formula to calculate the maximum swap space required for the system so that performance will improve.
Increasing swap space won't improve performance. Only increasing RAM or pseudoswap.
(And you probably want minimum instead of maximum. :-)
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10-31-2011 11:46 PM
10-31-2011 11:46 PM
Re: Regarding swap memory on HP-UX server.
Hi Dennis
Thanks for the reply. Then please let me know both minimum and maximum swap space. And also what exactly the pseudoswap means?
Thanks,
Narendra
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11-01-2011 12:09 AM
11-01-2011 12:09 AM
Re: Regarding swap memory on HP-UX server.
>Then please let me know both minimum and maximum swap space. And also what exactly the pseudoswap means?
Pseudoswap is memory backed swap, RAM. (See memory line.)
Minimum device swap is what you need to get your application to work. If you want performance, you want to use as little device swap as possible.
>I want to know if I change the priority of swap device file to 2 it will then use more physical memory and performance of system will improve.
That won't change things. As quoted by other experts on the forum, if you are worried about priority, you are just rearranging the deck chairs on the titanic.
>As currently all swap space is reserved fully.
Yes, your device swap is reserved but not used. That's a good thing.