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Full Discussion: HELP - memory usage on Solaris : ps -efl and top
Operating Systems Solaris HELP - memory usage on Solaris : ps -efl and top Post 302454796 by jlliagre on Monday 20th of September 2010 03:42:09 AM
Old 09-20-2010
Quote:
Originally Posted by newbie_01
- In saying that, what am mainly wanting to achieve I suppose is whether the reported memory usage from ps -efl column is correct or not. If I sum up the values under the SZ column and the total is less than the total RAM on the server, does that mean, swapping is not happening.
Likely, but not necessarily.
Quote:
Will there be a case where the sum of the SZ column is greater than the total RAM on the server in which case, that should mean swapping is happening?
Possibly but not necessarily.
Quote:
BTW, is it possible to get total memory usage using the ps command ... Smilie ... am currently doing this via an awk script.
"ps" doesn't do aggregation. You might want to use "prstat -Z" to get that kind of statistics. Beware that kernel RAM usage isn't reported by ps or prstat as the kernel isn't a process, at least not a regular one.
Quote:
- SmilieSmilieYou said "You have plenty of available memory (most of the ZFS file data is available to applications should they need it)", how are you able to tell that it is available or unavailable?
Because that's by design. ZFS is the only file system I know that reports its cache as used memory. Other file systems report the equivalent as free memory. This is confusing a lot of ZFS users.
Quote:
Am presuming you are getting this info from the "echo ::memstat | mdb -k". Doesn't the output from that mean used/allocated memory by "ZFS File Data" rather than whether it is available/unnavailable memory or is that a wrong assumption? Can you please explain further?
A large part of it is, as I just wrote, available to process for allocations so is really free memory.
Quote:
- The "no swapping" conclusion is from the top command so without using top, my vmstat output is as below, po is zero (0) so that confirms that swapping is not happening.
Better to watch vmstat "sr" column, as long as it stays equals or close to zero, there is no worry to have about swapping.
 

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