buffer cache question

[Luca Rasconi]

Hi all,
how can i know the amount of buffer cache used in the system?

Thank you

Luca

[G. Vrijhoeven · Accepted solution]

Hi Luca,

You can check it with glance or gpm if you have that installed.

Gideon

[James R. Ferguson]

Hi:

You can run 'glance' for a dynamic view. Toggle the 'm'emory metrics screen by typing 'm'.

Use 'kmtune -l' to see your kernel parameters. For buffer cache, you should look at 'dbc_min_pct', 'dbc_max_pct', 'nbuf' and 'bufpages'. The latter two parameters should be set to zero to enable the 'dbc_min_pct' and 'dbc_max_pct' dynamic buffer cache.

Regards!

...JRF...

[Sridhar Bhaskarla]

Hi Luca,

If you don't have glance installed on your box, you can use kmeminfo to get this information.

You will need to have Q4 (patched) installed on the box.

Run

#/usr/contrib/Q4/bin/kmeminfo

Look for Buffer Cache section and multiply with 4096.

-Sri

[James Murtagh]

Hi Luca,

In addition to the above you can run the following command:

# echo bufpages/D|adb -k /stand/vmunix /dev/kmem

Again, this is the amount in pages so multiply by 4096 for the amount in bytes.

Regards,

James.