mishoo · HackerTrans

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I can see what happens there in JSCL.. I took a look at

    (disassemble (lambda () (loop for i below (expt 10 8) count t)))

Seems TAGBODY is compiled into a while(true) which sets an exception handler on each iteration. (and then, LOOP macroexpands into a TAGBODY). I don't think there's a better way to do it, BTW — JS is simply not a friendly compilation target. But `try` on each iteration is quite costly, that's most probably the bottleneck here.

mishoo

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Hey, nice to see Ymacs is still used somewhere else than on my website :)

I don't know if you've been tracking it lately, but there was a big overhaul last year [1]. The version in your second link doesn't seem to work in current Firefox. If you'd like to update and need any help, please feel free to get in touch. (also, there's still some of your code in Ymacs :) although I kinda broke filename completion...)

[1] https://lisperator.net/blog/ymacs-reloaded/

mishoo

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Hm, you're right, JSCL seems abnormally slow on this loop (27.5 sec here). SLip consistently takes 19.3 sec. My CPU is rather beefy (Ryzen 9 HX 370). What's your hardware and browser?

But JSCL is much faster on the fib example, that's why I thought it should be generally faster. After all, it compiles to JS.

mishoo

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In SLip: https://lisperator.net/s/slip/

    SL-USER> (time (loop for i below (expt 10 8) count t))
    Evaluation time: 19376ms
    100000000

    SL-USER> (time (loop for i below 1000000 count t))
    Evaluation time: 272ms
    1000000

    SL-USER> (defun fib (n) (if (< n 2) n (+ (fib (- n 1)) (fib (- n 2)))))
    #'FIB
    SL-USER> (time (fib 32))
    Evaluation time: 1601ms
    2178309

These timings are in Firefox; Chromium is almost 2x faster. Also, it doesn't completely freeze the browser in the mean time (we have green threads).

I used to think it's quite slow, but somehow it's much faster than any other posted here. The only Lisp in browser I know to beat SLip (by a large margin) is JSCL, which compiles to JS.

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