This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
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Time Measurement & Optimization
Mathematica's symbolic timing framework allows timing information not only to be analyzed but also to be used in the structure of algorithms. Mathematica provides functions to allow programmers to take advantage of the same kinds of powerful optimizations as Mathematica's carefully tuned internal code.
TimeConstrained run a command for at most a specified time
    
Timing CPU time to run a command within the Mathematica kernel
AbsoluteTiming total wall-clock time to run a command
    
Time Optimizations
N use approximate rather than exact numbers
Compile compile a numeric function
Dispatch preprocess large lists of rules
Hash find a numeric hash code for any expression
DumpSave save data in .mx native Mathematica format
Low-Level Functions
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