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
we have another server in which the paging utilization keep incresing and we have to restart the application everyday to make it normal
here is the tunable parameters
let me know if requre any more details to find the issue
out of the blue I would try to set minperm% to 5 and maxperm% to 90 (maxclient% as well to 90) and check if the behaviour changes. lru_file_repage is already set to 0 so you usually go with something above.
What type of application(s) is running on the box, a DB, ...?
It would also be interessting to see which processes are using the most paging space:
Can you also please post the outputs of:
And the most important of all:
Use code tags for the output
Lots of free memory on a well warmed up server is just an indication of lots of exiting processes as part of the app. Exit frees the RAM footprinnt of the local parts of the process (heap and stack -- code is usually shared pages), bumping up free RAM until paging in eats it away. Sometimes this indicates too much shell programming, or bad shell programming, as processes are executed and discarded over and over. Sometimes these are spun off from server functions. The JAVA webserver process is probably not really freeing RAM to the OS, as free() is just putting it back in the free pool of the memory allocation arena awaiting the next malloc(), or the JAVA gc equivalent.
The svmon did not show much, seems this sort is an > AIX 5.3 thing; try this one and check which has/have by far the highest value in the column "Pgsp":
I would set parameters as recommended in my former post and see if the paging stops, hopefully.
This may take some time since there is still a lot out on the disk that needs at least to be paged in when it's needed. To speed this up, reboot the box after setting the following command...
You can set them online with the following command:
The -p makes it permanent and survives a boot.
I've seen this type of thing before although it was quite a number of years ago, it actually turned out to be a memory leak from badly written code. It was hard to track it down, we had four P695's alll running the exact same application suite - just turned out to be that the one used for reporting had the problem.
So possible looking at the usage of eack of the boxes may provide a pointer.
Hi,
This thread has been posted before on linuxquestions.org, but no answer, maybe because this is unix question and not linux. I'm posting the same thread here, hope I can get an answer from someone in the meantime, I wish I could post of emergency thread but it needs bits which I don't have :... (6 Replies)
good morning,
how I can know how much total and free memory I have in my AIX 5.3 server, and this is shown in megabytes or gigabytes?
Thank you very much. (4 Replies)
All,
AIX: 6.1 64 bits
How to find out Free memory available on AIX 6.1 64 bits
When I used :
svmon -G
size inuse free pin virtual mmode
memory 1048576 612109 191151 215969 549824 Ded-E
pg space 4325376 ... (1 Reply)
Hello,
I've been reading your forums for quite a while and the great amount of information I find here always come in hand.This time however, I need some specific help...
I have a doubt with an AIX server which I'm failing to understand as I'm new to its concept of memory management...
... (8 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,
We have AIX 5.1 machine of RAM 8 GB and paging space is 8GB. we are getting high memory usage of almost 99%.Can anybody please help in this ?
Partial vmstat o/p
kthr memory
----- -----------
r b avm fre
2 1 278727 1143
There is no paging issue.Becoz in... (5 Replies)
Friends , i have a question how to check the total memomry and free memory in AIX, We have vmstat ,svmon and topas commands.Which command among the will give the true figure. (6 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)