[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#8940: Evidence of bug in `random'
From: |
Rafael D Sorkin |
Subject: |
bug#8940: Evidence of bug in `random' |
Date: |
Sun, 26 Jun 2011 23:40:18 -0400 |
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
~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- bug#8940: Evidence of bug in `random',
Rafael D Sorkin <=