Mint Compile Time Improvement

I just committed a small change as a result of profiling Mint programs: We are now treating all compiler invocations as one long compile session, instead of having many short ones during the execution of a Mint program. This reduces overhead since each symbol only needs to be completed once.

Compile times are cut by a factor of about 3 in our benchmarks. Not as much as I’d hoped, but it’s a start. It seems like my initial estimates were skewed by the presence of the profiler itself.

I’m going to profile again now.


I got another improvement by a factor of about 1.5 by replacing an O(n) list append with an O(1) list prepend. But I think now it will be difficult to get anything more without major rewrites of the compiler.

Compiling now represents 11% of a profiled run of LintFib, parsing is 1% (keep in mind that profiling skews the percentages).


About Mathias

Software development engineer. Principal developer of DrJava. Recent Ph.D. graduate from the Department of Computer Science at Rice University.
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