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Operating Systems AIX How to check free/total Memory in AIX Post 302158723 by bakunin on Wednesday 16th of January 2008 06:20:35 AM
Old 01-16-2008
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):

Code:
# lsattr -El mem0
goodsize 16384 Amount of usable physical memory in Mbytes False
size     16384 Total amount of physical memory in Mbytes  False
# vmstat -v
              4194304 memory pages
              3977913 lruable pages
                19249 free pages
                    2 memory pools
               785742 pinned pages
                 80.0 maxpin percentage
                 20.0 minperm percentage
                 80.0 maxperm percentage
                 55.5 numperm percentage
              2210872 file pages
                  0.0 compressed percentage
                    0 compressed pages
                 55.5 numclient percentage
                 80.0 maxclient percentage
              2210872 client pages
                    0 remote pageouts scheduled
                 2422 pending disk I/Os blocked with no pbuf
              4976055 paging space I/Os blocked with no psbuf
                 2484 filesystem I/Os blocked with no fsbuf
                 8021 client filesystem I/Os blocked with no fsbuf
               101407 external pager filesystem I/Os blocked with no fsbuf
                    0 Virtualized Partition Memory Page Faults
                 0.00 Time resolving virtualized partition memory page faults

I hope this helps.

bakunin
 

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VM_STAT(1)						    BSD General Commands Manual 						VM_STAT(1)

NAME
vm_stat -- show Mach virtual memory statistics SYNOPSIS
vm_stat [[-c count] interval] DESCRIPTION
vm_stat displays Mach virtual memory statistics. If the optional interval is specified, then vm_stat will display the statistics every interval seconds. In this case, each line of output displays the change in each statistic (an interval count of 1 displays the values per second). However, the first line of output following each banner displays the system-wide totals for each statistic. If a count is pro- vided, the command will terminate after count intervals. The following values are displayed: Pages free the total number of free pages in the system. Pages active the total number of pages currently in use and pageable. Pages inactive the total number of pages on the inactive list. Pages speculative the total number of pages on the speculative list. Pages throttled the total number of pages on the throttled list (not wired but not pageable). Pages wired down the total number of pages wired down. That is, pages that cannot be paged out. Pages purgeable the total number of purgeable pages. Translation faults the number of times the "vm_fault" routine has been called. Pages copy-on-write the number of faults that caused a page to be copied (generally caused by copy-on-write faults). Pages zero filled the total number of pages that have been zero-filled on demand. Pages reactivated the total number of pages that have been moved from the inactive list to the active list (reactivated). Pages purged the total number of pages that have been purged. File-backed pages the total number of pages that are file-backed (non-swap) Anonymous pages the total number of pages that are anonymous Uncompressed pages the total number of pages (uncompressed) held within the compressor Pages used by VM compressor: the number of pages used to store compressed VM pages. Pages decompressed the total number of pages that have been decompressed by the VM compressor. Pages compressed the total number of pages that have been compressed by the VM compressor. Pageins the total number of requests for pages from a pager (such as the inode pager). Pageouts the total number of pages that have been paged out. Swapins the total number of compressed pages that have been swapped out to disk. Swapouts the total number of compressed pages that have been swapped back in from disk. If interval is not specified, then vm_stat displays all accumulated statistics along with the page size. Mac OS X August 13, 1997 Mac OS X
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