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.
svmon -G
size inuse free pin virtual
memory 786432 99980 686452 61545 86822
The memory size of the system is 786432 frames (786432*4*1024
bytes, or 208 GB). This size is split into the inuse frames (99980
frames) and the free frames (686452 frames).
I have written this tiny script to accurately do the stuff. u can use this.
.
Save the below code between the Marker Lines, into a file called WHAT_EVER_YOU_WANT.sh and give it executable permissions by executing chmod as follows:
chmod +x ./WHAT_EVER_YOU_WANT.sh
And execute it, it will give you all the details like current RAM in MB's ( easy to understand ) and also who are connected remotely and form where. you can tailor it to use only the memory retrieval part also.
best,
-- Chandan Maddanna
Last edited by bakunin; 06-13-2009 at 02:44 AM..
Reason: added code-tags
To get the total memory simply look for its attributes:
lsattr -El mem0
What exactly do you mean by "total memory" and "free memory"? The available physical RAM? The available space in RAM plus the available swap space (the virtual memory) ? Depending on what exactly you want to know you can use vmstat or svmon (only as root) with various options. You can also use topas, nmon or any other similar tool, because the numbers they show are available on public OS interfaces (read: system calls) which are just queried by these tools. The difference to svmon and vmstat is just the presentation of the data gathered this way.
You can also use "vmstat -v", just keep in mind that the number is shown in memory pages (in AIX this is 4k) instead of bytes or kilobytes. For example, a machine with 16GB RAM installed (i have marked bold the corresponding numbers for you):
An introduction to "nmon" can be found at IBM Wikis - AIX 5L Wiki - nmon Introduction Workshop. The audio briefs under "Section 7 -nmon Frequently Asked Questions" can help you to better understand how AIX tries to use all available memory. Thus "no free memory" may not be bad, if it is being used as filesystem cache.
Hi
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