Specifies the number and type of sampling interval.
Timer - Samples every Cycles non-halted processor clock cycles. If Cycles is not specified, 10,000,000 cycles are used.
PF - Samples every Events page faults. If Events is not specified, 10 page faults.
Sys - Samples every Events calls to the operating system. If Events is not specified, 10 system calls are used.
Counter - Samples every Reload number of the CPU performance counter specified by Name. Optionally, FriendlyName can specify a string to use as the column header in profiler reports.
GC - Collects .NET memory data. By default (allocation), data is collected at every memory allocation event. When the lifetime parameter is specified, data is also collected at each garbage collection event.