* [COFF] Tail-recursion was Re: [TUHS] Lorinda Cherry [not found] ` <20220222103948.1B0482206F@orac.inputplus.co.uk> @ 2022-02-23 0:48 ` Will Senn 2022-02-23 0:53 ` silas poulson 2022-02-23 1:45 ` Charles H. Sauer (he/him) 0 siblings, 2 replies; 3+ messages in thread From: Will Senn @ 2022-02-23 0:48 UTC (permalink / raw) To: COFF My all time favorite presentation on tail-recursion: https://www.youtube.com/watch?v=-PX0BV9hGZY On 2/22/22 4:39 AM, Ralph Corderoy wrote: > Hi Otto, > >> MacOS uses the GNU implementation which has a long standing issue with >> deep recursion. It even cannot handle the tail recursive calls used >> here and will run out of its stack. > When learning dc and seeing it relied on tail calls, the first thing > I did was check it did tail-call elimination, and it did. That was > GNU dc. > > Trying just now, I see no growth in memory usage despite heavy CPU load > shown by TIME increasing. > > $ dc > !ps u `pidof dc` > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > ralph 11489 0.0 0.0 2332 1484 pts/1 S+ 10:33 0:00 dc > [lmx]smlmx > ^C > Interrupt! > !ps u `pidof dc` > USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND > ralph 11489 75.5 0.0 2332 1488 pts/1 S+ 10:33 0:46 dc > > The memory used remained at that level during the macro execution too, > watched from outside. > > Do you have more detail on what GNU dc can't handle? dc without > tail-call elimination is a bit crippled. > _______________________________________________ COFF mailing list COFF@minnie.tuhs.org https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [COFF] Tail-recursion was Re: [TUHS] Lorinda Cherry 2022-02-23 0:48 ` [COFF] Tail-recursion was Re: [TUHS] Lorinda Cherry Will Senn @ 2022-02-23 0:53 ` silas poulson 2022-02-23 1:45 ` Charles H. Sauer (he/him) 1 sibling, 0 replies; 3+ messages in thread From: silas poulson @ 2022-02-23 0:53 UTC (permalink / raw) To: Will Senn; +Cc: COFF Yes! That’s such as fun presentation! For those who want the fast version, skip to 6:00 mark. Silas > On 23 Feb 2022, at 00:48, Will Senn <will.senn@gmail.com> wrote: > > My all time favorite presentation on tail-recursion: > > https://www.youtube.com/watch?v=-PX0BV9hGZY > > > On 2/22/22 4:39 AM, Ralph Corderoy wrote: >> Hi Otto, >> >>> MacOS uses the GNU implementation which has a long standing issue with >>> deep recursion. It even cannot handle the tail recursive calls used >>> here and will run out of its stack. >> When learning dc and seeing it relied on tail calls, the first thing >> I did was check it did tail-call elimination, and it did. That was >> GNU dc. >> >> Trying just now, I see no growth in memory usage despite heavy CPU load >> shown by TIME increasing. >> >> $ dc >> !ps u `pidof dc` >> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND >> ralph 11489 0.0 0.0 2332 1484 pts/1 S+ 10:33 0:00 dc >> [lmx]smlmx >> ^C >> Interrupt! >> !ps u `pidof dc` >> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND >> ralph 11489 75.5 0.0 2332 1488 pts/1 S+ 10:33 0:46 dc >> >> The memory used remained at that level during the macro execution too, >> watched from outside. >> >> Do you have more detail on what GNU dc can't handle? dc without >> tail-call elimination is a bit crippled. >> > > _______________________________________________ > COFF mailing list > COFF@minnie.tuhs.org > https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff _______________________________________________ COFF mailing list COFF@minnie.tuhs.org https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [COFF] Tail-recursion was Re: [TUHS] Lorinda Cherry 2022-02-23 0:48 ` [COFF] Tail-recursion was Re: [TUHS] Lorinda Cherry Will Senn 2022-02-23 0:53 ` silas poulson @ 2022-02-23 1:45 ` Charles H. Sauer (he/him) 1 sibling, 0 replies; 3+ messages in thread From: Charles H. Sauer (he/him) @ 2022-02-23 1:45 UTC (permalink / raw) To: coff An opportunity for Auto-Tune?? On 2/22/2022 6:48 PM, Will Senn wrote: > My all time favorite presentation on tail-recursion: > > https://www.youtube.com/watch?v=-PX0BV9hGZY -- voice: +1.512.784.7526 e-mail: sauer@technologists.com fax: +1.512.346.5240 Web: https://technologists.com/sauer/ Facebook/Google/Twitter: CharlesHSauer _______________________________________________ COFF mailing list COFF@minnie.tuhs.org https://minnie.tuhs.org/cgi-bin/mailman/listinfo/coff ^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-23 0:48 ` [COFF] Tail-recursion was Re: [TUHS] Lorinda Cherry Will Senn
2022-02-23 0:53 ` silas poulson
2022-02-23 1:45 ` Charles H. Sauer (he/him)
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