Yes, you're looking at the right graph. If you look at the left hand side, that's running a match on a single-byte string, so essentially all the time is in construction.

Unless I missed something looking at the timing scripts (.tar.gz), you're comparing the run-time of entire programs -- e.g. perl/ruby/etc programs -- versus your compiled C-code. That doesn't seem like a useful comparison of regexp algorithms.

Are you really measuring the load time of Perl, the compilation time of the perl regexp test program and its execution and comparing that to the run time of your NFA code that is just a couple hundred lines of C?

The other test programs all seem to be interpreted or call sh to execute a command line tool. Whereas your README suggests that the comparable nfa test program is a compiled C executable being run directly.

-xdg

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In reply to Is this apples vs oranges? (was Re^6: Perl regexp matching is slow??) by xdg
in thread Perl regexp matching is slow?? by smahesh

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