HP Caliper HP-UX Release Notes

configurations. To measure a program such as this, you must specify the
--process-all option.
• The cgprof results are affected by the instrumentation done to collect the data.
The times may be inaccurate in absolute terms but valid in relative terms. Use
fprof to obtain accurate timing data and cgprof for call-graph relative data.
• HP Caliper uses one POSIX thread per measured process. HP Caliper aborts if the
number of measured processes reaches the per-process thread limit.
The limit is defined by the kernel tunable parameter max_thread_proc. As root,
use kmtune(1M) or sam(1M) to adjust this value.
• In cstack mode, the kernel does not allow HP Caliper to stop a thread in
uninterruptible sleep state. Hence, if a process has one or more threads in
uninterruptible sleep state, the callstack profile may be inaccurate.
10 Known Problems and Workarounds