How to find out free memory ???

[gtm]

Hi everyone,

I want to increase the db_block_buffers. But when i see the free memory through sar -r unix command it just shows the blocks equal to 3meg.

The size of the RAM on the box is 2.5G and the SGA size is 1G. Is unix system using more than 1 G of RAM ?.

I would really appreciate your help.

Thanks,

gtm

[marist89]

Which Unix? On Solaris, the command to find physical memory is prtconf | grep Memory

Depending on the number of users, I like to have the SGA about 50-60% of Physical RAM.

[gtm]

Thanks for your reply. Its solaris.

The physical memory :

prtconf |grep memory = 2560 M



$ sar -r 5 4

SunOS marge 5.7 Generic_106541-15 sun4u 06/22/01

16:15:13 freemem freeswap

16:15:18 6664 9567952
16:15:23 6661 9567952
16:15:28 6658 9567952
16:15:33 6652 9567952

Average 6659 9567952


free memory : 6659 blocks of 512 bytes = 3.1M ???


Thanks
gtm

[marist89]

freemem reports the number of PAGES of free memory, not of disk blocks.

freeswap reports the number of BLOCKS free (512 bytes).

If you have a page size of 2k (the solaris default, I think), then you have (6659 * (2*1024))/(1024*1024) or 13M free.

[gtm]

Thank you Jeff for the reply.

I still have confusion, the SGA size is 1.1 G, then rest of 1.4 G is used by Unix ??.

The freemem report is valid ?.

Why is only 13M left ??

Your help is really appreciated.

Thanks,

gtm