[ADMIN] What's using all my RAM?

[adey]

Please could someone tell me how to discover what is using all of my RAM?

I am trying to run a vacuum against Postgres, but it fails immediately with:-

 

"ERROR:  out of memory
DETAIL:  Failed on request of size 1073741820."

 

TOP shows the following:-

Mem:   4077544k total,  3897868k used,   179676k free,   146960k buffers
Swap:  2000084k total,      440k used,  1999644k free,  3352892k cached

None of the listed processes appear to be using more than 1 or 2% MEM.

 

Postgres v7.4.2 (upgrade underway)