process memory size~

[???_185]

UNIX95= ps -e -o ruser,vsz,pid,ppid,args|sort -rnk2 |head -5
oracle 131376 2473 1 ora_arc1_CDR
oracle 131376 2471 1 ora_arc0_CDR
oracle 131376 2463 1 ora_lgwr_CDR
oracle 123392 28555 1 oracleCDR (LOCAL=NO)
oracle 123184 2461 1 ora_dbw1_CDR
root@cdr:/]# ps -elf | awk '{print $10" "$4" "$16}' | sort -n | tail -5 | sort -rn
31820 2473 ora_arc1_CDR
31820 2471 ora_arc0_CDR
31820 2463 ora_lgwr_CDR
30540 2461 ora_dbw1_CDR
30540 2459 ora_dbw0_CDR

in glance RSS of ora_arc1_CDR is 42mb
first sentence is vsz size and second is vsz.
third is RSS
ora_Arc1_CDR is 131376, 31820 and 42 size.
is it all same?
if so, how cam I read?
131376 bytes? 31820 bytes, 42mb?
what difference is it?

[Joseph Loo]

hi,

vsz is size in kilobytes, thus, the process associated with ora_arc1_CDR is taking about 131MB of memory.

the one u have taken from "ps -elf" is not vsz but sz which is size in physical pages (about 4kb).

"man ps" for more info.

regards.

[RAC_1]

vsz - virtual segment size (contains ram occupied + virtual memory)
sz-Same as above except that it also counts text, stack and data sizes.
RSS-resident segment size. All the code of program need not to be in memory. This is the size that is resident in memory at given point in time.

[???_185]

what is the difference between vsz and rss?
overall size in the sytem is vsz~
and it just is ocuppied in memory is rss?
if so ,in what kind of situation do i have to view these?