I have an overloaded DB and I see several IDLE connections that are using significant CPU.. (Not Idle in transaction) Why would an idle process be eating so much cpu? Or is it not actually idle?
Here is an example from pg_top: last pid: 11821; load avg: 6.11, 6.32, 7.64; up 1+21:05:31 50 processes: 3 running, 42 sleeping, 5 uninterruptable CPU states: 21.7% user, 0.0% nice, 7.8% system, 46.9% idle, 23.6% iowait Memory: 29G used, 149M free, 13M buffers, 27G cached Swap: PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND 4779 postgres 20 0 4383M 573M disk 3:16 4.79% 39.42% postgres: gpup gpup 10.202.99.5(46391) UPDATE 11591 postgres 20 0 4383M 108M sleep 0:12 2.08% 19.61% postgres: gpup gpup 10.202.99.6(52459) idle 4191 postgres 20 0 4384M 709M sleep 4:33 2.50% 19.41% postgres: gpup gpup 10.202.99.6(42288) idle 10942 postgres 20 0 4383M 242M sleep 0:42 5.08% 16.86% postgres: gpup gpup 10.202.99.5(58373) idle 10930 postgres 20 0 4390M 281M sleep 0:43 1.62% 15.30% postgres: gpup gpup 10.202.99.6(52273) idle 11571 postgres 20 0 4390M 210M run 0:25 4.32% 14.51% postgres: gpup gpup 10.202.99.6(52455) SELECT 11533 postgres 20 0 4383M 109M run 0:14 2.31% 12.75% postgres: gpup gpup 10.202.99.6(52453) SELECT 7494 postgres 20 0 4384M 1611M disk 2:31 2.44% 12.35% postgres: gpup gpup 10.202.99.6(53620) SELECT
