Sizing RAM usage in a SUN

[Peter Brouwer]

In article <210 at melpar.UUCP> jim at melpar.UUCP (J. Hopkins) writes:
>
>
>	I am trying to calculate the amount of RAM taken up by application
>tasks in a SUN 4/260.  My local SUN rep. told me to use pstat or ps.
>Pstat reports sizes in "pages" which I believe are 8k bytes each. 
Depends of the system, see the ctob macro in /usr/include/sysmacros on
how to convert from clicks ( pages ) to bytes.

>There are two "size" fields one is SZ which is the executable image and
>the other is the RSS which is the "real" size in RAM.
>
>	Questions:
>	1) Is there a better way to evaluate size than pstat and ps?

Write your own tool:
If you have the source of ps available than you can use that as an example.
You have to read the region structures to get the size of each item (
text, data, stack and so on ) . There may be more than one region for each
for each type. The type can be found in p_type of the pregion of the 
process and in the region structure the field r_pgsz contains the size
of the type and r_nvalid contains the number of pages currently in memory.
Output looks like
Kernel data usage for each process + system stack (= USIZE) = 8 k

name          text     data     stack   shtext   shdata    shmem   dmmem    vpix

sched          0   0|   0   0|   0   0|   0   0|   0   0|   0   0|   0   0
init          36  36|  16  16|   8   4|   0   0|   0   0|   0   0|   0   0
vhand          0   0|   0   0|   0   0|   0   0|   0   0|   0   0|   0   0
bdflush        0   0|   0   0|   0   0|   0   0|   0   0|   0   0|   0   0
getty         16  12|   8   8|   8   4|  20  20|   4   4|   0   0|   0   0
uugetty       28  28|  20  16|   8   4|   0   0|   0   0|   0   0|   0   0
ksh          104 104|  28  28|   8   4|   0   0|   0   0|   0   0|   0   0
cron          24  24|  20  20|   8   4|  20  20|   4   4|   0   0|   0   0
uugetty       28  28|  20  16|   8   4|   0   0|   0   0|   0   0|   0   0
pp            16  12|  36  36|   8   4|  20  20|   4   4|   0   0|   0   0


    physmem    3712 Kbytes 928 pages
    freemem    1292 Kbytes 323 pages


For comercial reasons I cannot post the source.
>	3) Where are shared library sizes accounted for?
>           Are they in each entry of a pstat?
>	   (i.e. I'm adding them in multiple times)
Text of shared libraries are to be accounted for once and its data for each 
user.
>	4) How can I get an accurate RAM usage for each task?
I use the above described tool.
>	6) If there is enough physical RAM to hold the tasks will there
>	   still be swapping?
Depends on the low water mark of the vhand process, see GPGSLO in tuneable.h


-- 
#  Peter Brouwer,                     ##
#  Philips TDS, Dept SSP-V2           ## voice +31 55 432523
#  P.O. Box 245                       ## UUCP address ..!mcvax!philapd!pb
#  7300 AE Apeldoorn, The Netherlands ## Internet pb at idca.tds.philips.nl