Roughly:

mknod my_pipe1 p
mknod my_pipe2 p
nohup compress < my_pipe1 > my_pipe2 &
nohup split -m 2000 < my_pipe1 &
nohup pg_dump > my_pipe1 &

How about


pg_dump | split -m 2000

?

Regards,
Bjoern

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TIP 9: the planner will ignore your desire to choose an index scan if your
     joining column's datatypes do not match

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