renice not working on Leopard?

Wondering if anybody else has seen issues with "renice" not doing what it is supposed to do?

I used to run BOINC (think "SetiAtHome") applications on my Mac. These apps usually run with postivie "niceness", meaning that they soak up all otherwise unused CPU cycles. On Tiger, Activity Monitor used to show in fact a non-zero "% Nice" value when I had BOINC running.

Since upgrading to Leopard, BOINC is running with 0 "niceness" and Activity Monitor always shows a "0" for "% Nice". This means that BOINC is now more aggressively competing for CPU cycles with other applications, creating a noticeable drag on the system.

I've also tried launching a CPU intensive app from the command line and then using "renice" to change its "niceness" level, to rule out any BOINC compatibility issues with Leopard. The "renice" command does not fail, but it seems to be completely ignored and does not do anything to change a processe's "niceness".

Has anybody else seen this or am I missing something here?

BTW: Did an "Archive and Install". Observed this behavior on an "Early 2006" iMac, as well as on an 1.83 GHz Macbook (but I'd not recommend running something like BOINC on a notebook anyways... ;-))

thanks,

ceci