From: Rafael D Sorkin <rsorkin@perimeterinstitute.ca>
To: 8940@debbugs.gnu.org
Subject: bug#8940: Evidence of bug in `random'
Date: Sun, 26 Jun 2011 23:40:18 -0400 [thread overview]
Message-ID: <E1Qb2gM-0005pB-P6@mars.pi.local> (raw)
The following report refers to this version of emacs:
GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.4) of
2011-04-04 on crested, modified by Debian
Hello,
I'm sorry to submit a rather vague report, but I have found
strong evidence of some sort of problem with the random number
generator `random'. I see the difficulty only indirectly in
some simulations I'm running. Results obtained from elisp's
`random' disagree by over 6 sigma with results obtained from
`mt-random' (the "mersenne twister") or from the built-in
functions in both clisp and sbcl.
Perhaps you could check for changes from earlier versions.
The problem seems absent from version 22.1.1.
Here's some info on the hardware from /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @
2.00GHz
stepping : 11
cpu MHz : 1995.000
cache size : 4096 KB
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep
mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2
ss syscall lm constant_tsc arch\
_perfmon pebs bts rep_good nopl tsc_reliable aperfmperf pni
ssse3 cx16 hypervisor lahf_lm dts
bogomips : 3990.00
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
Thanks,
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
Rafael Sorkin
Perimeter Institute for Theoretical Physics
31 Caroline Street North
Waterloo, ON N2L 2Y5
Canada
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
next reply other threads:[~2011-06-27 3:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-27 3:40 Rafael D Sorkin [this message]
2011-07-09 8:15 ` bug#8940: Evidence of bug in `random' Paul Eggert
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=E1Qb2gM-0005pB-P6@mars.pi.local \
--to=rsorkin@perimeterinstitute.ca \
--cc=8940@debbugs.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.