Why are intepreters so slow today
John Nagle (firstname.lastname@example.org)
Fri, 15 Apr 1994 05:27:04 GMT
Lately, I've been looking at interpreters suitable for use as
extension languages in a control application. I need something that
can do computation reasonably fast, say no worse than 1/10 of the
speed of compiled C code. Interpreters have been written in that speed
range quite often in the past. But when I try a few of the interpreters
available on the Mac, performance is terrible.
My basic test is to run something equivalent to
int i; double x = 0.0;
for (i = 0; i < 1000000; i++) x = x + 1.0;
The Smalltalk and Python versions are slower than the C version by factors
of greater than 1000. This is excessive. LISP interpreters do a bit
better, but still don't reach 1/10 of C. What interpreters do a decent
job on computation?