Page faults occure when a page is demanded but has not been read into memory. So this is not a problem at 1st hand but often just a usual way when things are read from disk into memory and I do not mean from paging space.
For scan rate and freeing memory I wrote something here: Scan Rates
It seems your box has running a CPU intensive java application and is not really short on memory. Nothing to worry about as long as the value of kthreads in the r-column (runqueue) is not bigger than the number of CPUs. Even though I saw boxes with higher numbers there and the application ran smooth though. It seems that current VMM setting just make it scanning memory where there is still enough available.
Severe memory problems usually are indicated when the pi/po columns of vmstat for example (which stand for pagingspaceins and pagingspaceouts) show any numbers. Usually you just try out some VMM settings and get over this. If not you might need more memory, which seems not the case with your box. Other tools show pi and po and mean normal pagein and pageout. Your topas output shows both, pageins/pageouts and pgspins/pgspouts. The later two regarding Paging Space are the problematic ones.
As it seems somebody has already tuned a bit on the box since
Does not have the default value anymore. Today people usually don't set this anymore but people set lru_file_repage=0 and let maxperm and maxclient on 80-90%. minperm is often reduced to 5%. So LRU decides with those thresholds when to clean up or not. You could check out if this is more pleasant for you and reduces sr/fr.
There is also some things here, that might not be noticable but can be tuned with ioo:
If those values don't increase fast/in big amounts, you might not want to worry about them - best monitor them to decide if you tune them with ioo or not.
If you decide to use vmo to try out what I suggested, you could do the following:
With vmo -x or -L you can always check back which command needs a reboot etc. and what the default values are and what the current are. So maybe write them down somewhere in case you want to go back. These 3 need no reboot. It can take some minutes until LRUD has settled memory.
Hello
Please can you tell me how to access COPY ON WRITE page faults in HP -UNIX.
I found the structure in
/usr/include/sys/vmmeter with the structure name vmmeter.
Please tell me the function to fill the values to this structure and also
the arguments for function.:: (5 Replies)
Hi,
Will anybody tell me what is this 'intransient blocking page faults' in HP-UX, it is in the structure _pst_vminfo in the header file /ust/include/sys/pstat/vm_pstat_body.h? (4 Replies)
I am running HP-UX B.11.11.
I'm increasing a parameter for a database engine so that it uses more memory to buffer the disk drive (to speed up performance). I have over 5GB of memory not being used.
But when I try to start the DB with the increased buffer parameter I get told.
"Not... (1 Reply)
Hi all,
Could please let me know how to get the more memory free space (not added the RAM) in local zone.
-bash-3.00# vmstat 2 5
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 s1 s1 s1 in sy cs us sy... (3 Replies)
Hi,
I'm trying to learn how to manage memory when I have to deal with lots of data.
Basically I'm indexing a huge file (5GB, but it can be bigger), by creating tables that
holds offset <-> startOfSomeData information. Currently I'm mapping the whole file at
once (yep!) but of course the... (1 Reply)
Hi,
OS = AIX 5.3
Large number of page faults recently start to occure on AIX 5.3 lpar with mysql database installed. I need help in setting AIX OS parameter to solve the paging problem and some guidance on interpreting my stats
t
Code:
# vmstat... (5 Replies)
hi guys i hope you can help me with this situation.
i have 2 lpar with aix 7.1 and oracle 11gr2 in grid mode.
when i start nmon to check the current system health i notice that page fault are over 3000/s. than i have opened a case with ibm and they say that the problem is not paging nor... (10 Replies)
Hi guys,
I have a zone on a M5000 server running solaris 10. The zone has an SAP application running on it and facing some performance issues. As part of the troubleshooting, I've been recommended to look for any paging on the OS. Please advise how to look for the paging.
I've been looking at... (4 Replies)
I am new to AIX, I have few AIX 5.3 servers and I could see there are significant difference in paging space utilization on servers even though they are running same applications
below server is working fine which shows 2-5 % paging usage throuh out the day
cpu_scale_memp = 8... (12 Replies)