Fwd: Process scheduling in postgres

Hi,

I have a 4 core CPU for postgres and I have submitted 6 queries parallely
in 6 different sessions. But I am seeing only 1 query per CPU and the
remainig queries are queued. I am not sure why is it happening. Do you have
any special scheduler for postgres? I can see that CPU has been shared with
other non postgres processes but postgres processes are not sharing any CPU
within a core. The following is the process states.

*lms 2868 2209 98 07:20 ? 00:02:30 postgres: lms controller
[local] SELECTlms 2869 2209 98 07:20 ? 00:02:30 postgres: lms
controller [local] SELECT*
lms 2870 2209 0 07:20 ? 00:00:00 postgres: lms controller
[local] SELECT
lms 2871 2209 0 07:20 ? 00:00:00 postgres: lms controller
[local] SELECT
lms 2872 2209 0 07:20 ? 00:00:00 postgres: lms controller
[local] SELECT
*lms 2873 2209 98 07:20 ? 00:02:30 postgres: lms controller
[local] SELECT*

If you see above, three Select queries have been queued. They are acquiring
CPU only when there is a core without any postgres query running on it.

I know the postgres limitation of one query using only one core. But is
there any limitation of one CPU running only one query at a time?

Your help is appreciated.

Thanks and regards,
Vineel.