From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: Not to incite a language war but apparently the Corona lockdown was based on 13 year old undocumented C-Code
Date: Tue, 12 May 2020 23:27:14 +0200
Date: 2020-05-12T23:27:14+02:00 [thread overview]
Message-ID: <r9f4bk$oa0$1@dont-email.me> (raw)
In-Reply-To: <hi0b03FgtgnU1@mid.individual.net>
On 5/12/20 9:16 PM, Niklas Holsti wrote:
>>
>> It seems clear that the code that was executed to create the predictions was
>> not deterministic on a single core.
>
> The first of the two cases of single-core "non-determinism" described and
> bewailed in the "review" is that the time evolution of the predicted epidemic is
> different depending on the value of a program option -- whether the "network" is
> created anew, or reused -- that should not affect the result. No actual
> non-determinism is claimed in the review, just that the epidemic reaches large
> infection rates sooner for one option value than for the other. It seems that
> the code was using the PRN generator slightly differently in the two cases,
> resulting in different PRN sequences.
The single-core non-determinism that I gathered from the referenced
interpretation of the review, which I clearly have not studied as carefully as
you, was that the program gave different results on the same computer for
identical inputs: same initial conditions and same RNG seed(s). Perhaps I
misunderstood, but that was what I got from it, and the only part that seemed
troubling. This is different from the kind of non-determinism of simulations
that are intended to be run many times with different RNG seeds. Possibly that
would be caused by accessing uninitialized variables.
--
Jeff Carter
"I did not rob a bank. If I'd robbed a bank, everything
would be great. I tried to rob a bank, is what happened,
and they got me."
Take the Money and Run
139
next prev parent reply other threads:[~2020-05-12 21:27 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 18:49 Not to incite a language war but apparently the Corona lockdown was based on 13 year old undocumented C-Code Rick Newbie
2020-05-11 20:27 ` Niklas Holsti
2020-05-11 21:12 ` Rick Newbie
2020-05-12 20:11 ` Niklas Holsti
2020-05-12 20:53 ` Dmitry A. Kazakov
2020-05-12 21:54 ` Niklas Holsti
2020-05-12 22:15 ` Rick Newbie
2020-05-13 11:07 ` Niklas Holsti
2020-05-13 13:23 ` Rick Newbie
2020-05-13 13:45 ` Niklas Holsti
2020-05-13 14:58 ` Rick Newbie
2020-05-13 15:31 ` Dmitry A. Kazakov
2020-05-13 15:48 ` Niklas Holsti
2020-05-11 21:45 ` gautier_niouzes
2020-05-12 15:56 ` Niklas Holsti
2020-05-11 21:55 ` Jeffrey R. Carter
2020-05-12 19:16 ` Niklas Holsti
2020-05-12 21:27 ` Jeffrey R. Carter [this message]
2020-05-12 22:20 ` Niklas Holsti
2020-05-12 22:39 ` Jeffrey R. Carter
2020-05-13 9:36 ` Niklas Holsti
2020-05-13 13:52 ` Optikos
2020-05-13 14:05 ` Niklas Holsti
2020-05-13 18:58 ` Optikos
2020-05-13 20:29 ` Niklas Holsti
2020-05-13 21:02 ` Optikos
2020-05-13 21:48 ` Niklas Holsti
2020-05-13 22:13 ` Optikos
2020-05-13 9:54 ` Niklas Holsti
2020-05-13 0:25 ` Olivier Henley
2020-05-15 13:23 ` Optikos
2020-05-16 5:01 ` Anatoly Chernyshev
2020-05-28 21:45 ` Optikos
2020-06-11 17:28 ` Olivier Henley
2020-06-11 17:36 ` Olivier Henley
2020-06-11 22:43 ` Anatoly Chernyshev
2020-06-12 12:10 ` Olivier Henley
2020-06-12 12:34 ` Anatoly Chernyshev
2020-06-12 17:36 ` Olivier Henley
2020-06-21 9:18 ` Anatoly Chernyshev
2020-06-22 13:36 ` Olivier Henley
2020-05-16 22:31 ` Niklas Holsti
2020-05-16 23:54 ` Optikos
2020-05-17 15:41 ` Niklas Holsti
2020-05-17 17:38 ` Optikos
2020-05-17 18:00 ` Simon Wright
2020-05-17 20:56 ` Optikos
2020-05-17 21:20 ` Simon Wright
2020-05-17 21:45 ` Optikos
2020-05-18 7:34 ` Simon Wright
2020-05-17 19:20 ` Niklas Holsti
2020-05-17 21:30 ` Optikos
2020-05-24 21:04 ` Bob Goddard
2020-05-31 15:01 ` Azathoth Hastur
2020-06-09 6:30 ` gautier_niouzes
2020-06-11 15:35 ` Olivier Henley
2020-06-11 15:49 ` Olivier Henley
2020-06-11 18:41 ` Anh Vo
2020-06-11 19:58 ` Olivier Henley
2020-06-11 20:41 ` Anh Vo
2020-06-11 20:47 ` Olivier Henley
2020-06-11 21:34 ` Anh Vo
2020-06-11 21:47 ` Olivier Henley
2020-06-11 21:39 ` Olivier Henley
2020-06-11 23:14 ` Anh Vo
2020-06-11 23:30 ` Jere
2020-06-11 23:55 ` Olivier Henley
2020-06-12 0:07 ` Olivier Henley
2020-06-12 0:42 ` Anh Vo
2020-06-12 11:08 ` Olivier Henley
2020-06-12 7:03 ` gautier_niouzes
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox