1) You should have XView 3.0 or later 2) how to build perf: xmkmf; make or vi Makefile.simple;make -f Makefile.simple 3) start it with ./perf or ./perf -\? 4) Press the right mouse button (Menu button) in the perf window. Bug reports to rfkoenig@immd4.informatik.uni-erlangen.de