Percept uses erlang:trace/3 and erlang:system_profile/2 to monitor events from
process states. Such states are,
- waiting
- running
- runnable
- free
- exiting
There are some other states too, suspended, hibernating, and garbage collecting (GC). The only ignored state is gc and a process is considered to have its previous state through out the entire garbage collecting phase. The main reason for this, is that our model considers the gc as a third state neither active nor inactive.
A waiting or suspended process is considered an inactive process and a running or runnable process is considered an active process.
Events are collected and stored to a file. The file can be moved and analyzed on a different machine than the target machine.