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Some profilers operate by [[Sampling (statistics)|sampling]]. A sampling profiler probes the target program's [[program counter]] at regular intervals using [[operating system]] [[interrupt]]s. Sampling profiles are typically less numerically accurate and specific, but allow the target program to run at near full speed.
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The resulting data are not exact, but a statistical approximation. "The actual amount of error is usually more than one sampling period. In fact, if a value is n times the sampling period, the expected error in it is the square-root of n sampling periods." <ref>[http://www.cs.utah.edu/dept/old/texinfo/as/gprof.html#SEC12 Statistical Inaccuracy of <tt>gprof</tt> Output]</ref>
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