set_ps_display on solaris x86

Our students are (unfortunately) on solaris x86 (unfortunate because I
have to do another round of testing before I deploy pgsql code for
them to hack).

Sadly, set_ps_display does not seem to have any effect in solaris
x86. At least ps only reports multiple postmaster processes and
arguments. 

Is there some magic incantation to be chanted to get this to work ? 

Thanks ! 

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Sailesh
http://www.cs.berkeley.edu/~sailesh