profiler causing severe slowdown
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Hey all! I've encounter a very odd problem: Suddenly, turning on the profiler causes an unbearable slowdown - even the most simple function hardly returns. * Turning the profiler off returns matlab back to life. * killing matlab and loading it again didn't solve the problem.
Any idea what to do or where to look at??
thanx in advance..
2 个评论
Robert Cumming
2011-7-5
show your example function you mention below
and which version/platform of matlab your using
alon
2011-7-7
回答（2 个）
C.J. Harris
2011-7-5
2 个投票
The Profiler will slow your system down. Only turn it on when you really need it. There is no way to avoid this slow-down.
Jan
2011-7-6
2 个投票
This is not a bug. Matlab's JIT can accelerate e.g. FOR loops substantially, but it reorders the calculations. This conclicts with the profiling and in consequence the JIT is disabled, if the profiler runs.
The same happens, if the debugger is enabled , e.g. by setting some breaks points. Example code: http://www.mathworks.com/matlabcentral/answers/8461-double-summation-with-vectorized-loops. This is 100 times faster without break points under Matlab 2009a.
Of course this can reduce the meaning of the profiling results. Therefore some TIC TOCs are often more useful.
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