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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Q on performance with 10000 faces
Date: Wed, 24 May 2006 20:36:28 -0400
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	 moncontrol() selectively controls profiling within a program.  When the
	 program starts, profiling begins.	To stop the collection of histogram
	 ticks and call counts use moncontrol(0); to resume the collection of his-
	 togram ticks and call counts use moncontrol(1).  This feature allows the
	 cost of particular operations to be measured.  Note that an output file
	 will be produced on program exit regardless of the state of moncontrol().

    I can't seem to find the corresponding doc on my GNU/Linux system,

Does moncontrol exist on GNU/Linux?

The facility sounds useful, but I think we need to make configure
check whether it is available.