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OProfile is low-overhead in most common cases; this is dependent on
the interrupt load OProfile has to deal with. The below results were
obtained with a pre-release version of OProfile 0.7 on a 2.6.0-test7
kernel. The hardware was an HP Netserver LPr with two 400Mhz Pentium
IIs. The overhead shown is the real-time overhead for compiling a Linux
kernel several times whilst OProfile is collecting data.
The x axis shows the mean average of profiling interrupts received per
second. The y axis shows the relative percentage overhead of the
real time to complete the task.
For comparison, the default settings of OProfile cause around 2,000
interrupts per CPU to be generated.
img("overhead.png", "OProfile is low overhead even at high rates of profiling interrupts", 726, 527);
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