memory usage commands

[Jerry L. Sims]

Does anyone know any GOOD tools (sar or vmstat,
etc.) to gather memory usage stats ? I need the
actual command syntax. Thanks........ :>)

[Con O'Kelly · Accepted solution]

Hi Jerry

To Show Free memory on system:
# vmstat 1 2 | tail -1 | awk '{printf "%d%s\n", ($5*4)/1024, "MB" }'

To Show Top Memory Processes:
# UNIX95= ps -el -o pid,comm,sz | grep -i -v pid | sort -nr -k 3,3 | head -15

This shows the top 15 processes for memory utilisation.

Cheers
Con

[Sundar_7]

Hi,

vmstat is the perfect tool for memory usage collection from the command line

# vmstat 1 1000 >> /tmp/vm.out

This will collect 1000 samples of vmstat output with an interval of 1 sec

# vmstat 1 >> /tmp/vmstat.out

The above command keeps collecting the vmstat output infinitely

Sundar.

[Geoff Wild]

Here's a script for you called memdetail - just compile it...

# memdetail
Memory Stat total used avail %used
physical 10080.0 9737.5 342.5 97%
active virtual 9586.4 4655.6 4930.8 49%
active real 7257.5 3446.8 3810.7 47%
memory swap 7697.1 1664.7 6032.5 22%
device swap 26528.0 9298.5 17229.5 35%

Rgds...Geoff

[Kiyoshi Miyake]

Hi.

glancePlus is very useful.
but not free.

or:
vmstat | tail -1 | awk '{printf("%6.2f\n",$4*100/($4+$5))}'

but, vmstat show virtual + real memory.
(include disk swap)

Regards.

[PVR]

Get the trial version of glance. Glance will give you more accurate data than sar / top / vmstat .

[Chauhan Amit]

Hi Jerry,

I am attaching a wonderful tool to collect the memory information. Given below is the procedure to install and sample output.

Procdure to use:
#chmod 777 kmeminfo.bin
#./kmeminfo.bin
#kmeminfo

Sample Output:
--------------------------
Physical memory usage summary (in page/byte/percent):

Physmem = 1572864 6.0g 100% Physical memory
Freemem = 293069 1.1g 19% Free physical memory
Used = 1279795 4.9g 81% Used physical memory
System = 396296 1.5g 25% By kernel:
text = 1977 7.7m 0% text
data = 282 1.1m 0% data
bss = 1596 6.2m 0% bss
Static = 81101 316.8m 5% for text/static data
Dynamic = 154798 604.7m 10% for dynamic data
Bufcache = 157286 614.4m 10% for buffer cache
Eqmem = 39 156.0k 0% for equiv. mapped memory
SCmem = 3072 12.0m 0% for critical memory
User = 887688 3.4g 56% By user processes:
Uarea = 6104 23.8m 0% for thread uareas
Disowned = 8 32.0k 0% Disowned pages

Total Memory : 6GB

Free Memory : 1.1g

Cheers,
Amit

[Rory R Hammond]

As to a previous suggestion....
I NEVER recommend chmod 777 on executable. To easy for a trojan horse. Especially a item that you know that root is going to use.

For 11X OS
echo 'phys_mem_pages/D'|
adb /stand/vmunix /dev/kmem|
grep pages | tail -1 |
awk '{print $2}'
For 10.2 OS
echo 'physmem/D'|
adb /stand/vmunix /dev/kmem |
tail -1 |
awk '{print $2}'

swapinfo is aslo helpful to see if your are swaping.