20200130, 18:56  #1 
Sep 2016
331 Posts 
50 Trillion Digits of Pi
So when Google set the record of 31.4 trillion digits last year, I gave it a 50/50 chance that record would fall before the end of the year.
Didn't quite work out that way. This latest computation suffered about a month of setbacks that pushed it all the way through January. But it is finally complete and passes verification. Congrats to Timothy Mullican for setting the new record for the most digits of Pi! His Blog: https://blog.timothymullican.com/cal...kingpirecord Compared to the Google's record last year, Tim used a 4socket Ivy Bridge machine with a 48drive array. The computation ran for 10 months starting from April and ending yesterday. The computation of the binary digits of Pi actually completed early in December and matched the results of BBP spot check. But the base conversion (which takes 2 weeks and has no checkpoints) took several attempts before completing successfully.  This base conversion has been an issue in 3 or the last 4 Pi records due to it being ~10% of the total time and having no checkpoints at all. 10% runtime of these computations of this size equates to multiple weeks  which is also comparable to the MTTF of the systems that are used. Why don't I have checkpoints in the base conversion? The algorithm is largely inplace and destructive. That's not to say it's impossible to checkpoint, but I just haven't figured out a good way to do it yet. Last fiddled with by Mysticial on 20200130 at 18:59 
20200130, 20:44  #2 
"Mike"
Aug 2002
2^{4}×499 Posts 

20200201, 11:49  #3 
Feb 2016
UK
13×31 Posts 
Reading this I almost want to have a go. Almost... That storage requirement is scary...

20200202, 08:21  #4 
Romulan Interpreter
Jun 2011
Thailand
22073_{8} Posts 
Very nice, congrats!
How do you make the base switch "in place"? I have some ideas how to transform from base 2 to base 10 quite fast and also have some checkpoints, but you would need more storage space (it can't really be done "in place"), and I don't believe this is new, for sure somebody else was thinking to it before. I "invented" it long time ago and used it in my programs in the past, but never for such large inputs. 
20200205, 04:19  #5 
Apr 2012
Standing, top right.
3^{2}×41 Posts 
Just finished reading the blog...impressive home build.

20200206, 13:09  #6 
"Mike"
Aug 2002
2^{4}×499 Posts 

20200206, 13:15  #7 
Sep 2002
Database er0rr
3594_{10} Posts 
5E19? I think it is 5E13.
For those who can recite many digits of pi.. How long would it take to recite the first 50 trillion digits given that you hold them in your brain? Last fiddled with by paulunderwood on 20200206 at 13:24 
20200206, 18:44  #8  
Dec 2008
you know...around...
2×313 Posts 
Quote:
(I've calculated this on my Casio calculator watch, so please correct me if I'm wrong) 

20200206, 18:54  #9 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
7·11·79 Posts 
In what language is that? Surely not in English. No one can speak English numbers that quickly and still be understood.
You might need a tonal language specially constructed for the task. All words can be 'ah' and just vary the tone. So basically just singing notes to the tune of Pi. Even then it would be extremely difficult. I'd like to hear someone try. 
20200206, 19:02  #10  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2^{2}×3×11×71 Posts 
Quote:
https://www.guinnessworldrecords.com...fastesttalker 

20200206, 19:04  #11  
Undefined
"The unspeakable one"
Jun 2006
My evil lair
7×11×79 Posts 
Quote:


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