SMP-support on PostgreSQL/Cygwin

Hello!

I've got PostgreSQL 7.2 running on Cygwin on a four-processor Win2K
server. Now I sometimes notice processor time being very unevenly
distributed between processors. When I start I time consuming job, at
the beginning it shows up quite evenly on all four processors. The
taskmanager shows 12 process-instances of postgres.exe running. One of
them however seems to consume quite a lot more processing power than the
others - I assume that this one is the daemon-postmaster, which spawns
all the other processes. In a later stage of the test-job, the processor
time on three of the processors seems to be falling, whereas on one of
the four usage remains at a high level. This could indicate that the
postmaster ist running exclusively on this one processor. Hence my
question: Is there no multithreading in this configuration which would
allow for a more evenly distribution of processing time on all available
processors?

Greetings,

Markus