Memory Breakup

[SSP_1]

Hi Guys,

I have a simple & straight-forward question. If my physical memory is 3500MB and I want to see how the breakup of memory is can I use UNIX95 command and take a total of vsz field?

If done so , I am getting total as 6500MB where is the physical mem of server is 3500MB, can anybody suggest how to derive a breakup of the physcial memory in use per process?

[Ollie R]

Hi,

You need Glance. Install this, then use the utility "gpm" to see the required breakdown.

Ollie.

[SSP_1]

Hi olie,

I have glance installed but don't have access to GUI so can't run gpm.

Is there any other method,,,,I mean from the character based display only by running glance.

[Dagmar Boelen]

Hi,

You can run glance in charactermode. Maybe the 6500MB did include virtual Memory?

Regards,

D.

[Ollie R]

Hi,

You can see statistics for a particular process in "glance", but I think you have to select the process first and show the details, there's no way to show a listed summary of processes with memory use.

Unless "top" will give you what you want?

Ollie.

[SSP_1]

Hi dagmar ,

The exact output for mem stats derived from glance is as below.

Total VM : 1.64gb Sys Mem : 212.9mb User Mem: 3.19gb Phys Mem: 3.50gb
Active VM: 755.9mb Buf Cache: 36.7mb Free Mem: 64.9mb

It shows the total mem = physical + virtual = 3.5+1.65 = 5.10 Gb

[Dagmar Boelen]

Hi,

Sounds I made correct quess. Please assign some points. (I have so little of them)

[James Murtagh]

Hi Shirpad,

Calculating memory usage in this granularity can be quite tricky if you are not aware exactly how memory is laid out. See the process and memory management white papers for a good description. For example, if you have 20 processes connecting to a 500MB shared memory segment you don't want to add this 20 times to your count.

If you know C your best bet is the pstat interface if this is hpux 11.00 or higher. This can give you global counts or per-process counts of memory/VM. The short program below can be used as an introduction - it uses the pid as the argument and prints the data segment size. You can add more fields/calculations/error checking as you see fit, but I've tried to keep it short.

Regards,

James.

#include
#include
#include
#include

struct pst_status buf;

void main(int argc, char *argv[])
{
if(argc != 2) {
printf("Usage: %d \n", argv[0]);
exit(1);
}

int pid = atoi(argv[1]);

pstat_getproc(&buf, sizeof(struct pst_status), 0, pid);

printf("Data segment size for process %d is %d KB\n", pid, buf.pst_dsize*4);
}

Sample output:

# ./procvm 3678
Data segment size for process 3678 is 632 KB