Re: [TUHS] Lorinda Cherry

[Bakul Shah <bakul@iitbombay.org>]

On Feb 17, 2022, at 1:18 PM, Dave Horsfall <dave@horsfall.org> wrote:
> 
> On Thu, 17 Feb 2022, Tom Ivar Helbekkmo via TUHS wrote:
> 
>> Watching the prime number generator (from the Wikipedia page on dc) 
>> running on the 11/23 is much more entertaining than doing it on the 
>> modern workstation I'm typing this on:
>> 
>> 2p3p[dl!d2+s!%0=@l!l^!<#]s#[s/0ds^]s@[p]s&[ddvs^3s!l#x0<&2+l.x]ds.x
> 
> Wow...  About 10s on my old MacBook Pro, and I gave up on my ancient 
> FreeBSD box.

That may be because FreeBSD continues computing primes while the MacOS
dc gives up after a while!

freebsd (ryzen 2700 3.2Ghz): # note: I interrupted dc after a while
$ command time dc <<< '2p3p[dl!d2+s!%0=@l!l^!<#]s#[s/0ds^]s@[p]s&[ddvs^3s!l#x0<&2+l.x]ds.x' > xxx
^C       11.93 real        11.79 user         0.13 sys
$ wc xxx
   47161   47161  319109 xxx
$ size `which dc`
    text   data     bss      dec       hex   filename
  238159   2784   11072   252015   0x3d86f   /usr/bin/dc

MacOS (m1 pro, prob. 2Ghz)
$ command time dc <<< '2p3p[dl!d2+s!%0=@l!l^!<#]s#[s/0ds^]s@[p]s&[ddvs^3s!l#x0<&2+l.x]ds.x' > xxx
time: command terminated abnormally
        1.00 real         0.98 user         0.01 sys
[2]    37135 segmentation fault  command time dc <<<  > xxx
$ wc xxx
    7342    7342   42626 xxx
$ size `which dc`
__TEXT	__DATA	__OBJC	others	dec	hex
32768	16384	0	4295016448	4295065600	100018000