In SciSmalltalk we added some more random generators but people should
have a look....
Stef
Le 22/10/15 18:21, Nicolas Cellier a écrit :
For these reasons, I often prefer the Marsaglia's KISS
2015-10-22 17:57 GMT+02:00 Henrik Johansen
<[email protected] <mailto:[email protected]>>:
> On 22 Oct 2015, at 2:49 , Tobias Pape <[email protected]
<mailto:[email protected]>> wrote:
>
>
>
> On 22.10.2015, at 14:37, David T. Lewis <[email protected]
<mailto:[email protected]>> wrote:
>
>> On Thu, Oct 22, 2015 at 06:28:09AM +0000,
[email protected] <mailto:[email protected]> wrote:
>>> Tobias Pape uploaded a new version of Network to project The
Trunk:
>>> http://source.squeak.org/trunk/Network-topa.166.mcz
>>>
>>> ==================== Summary ====================
>>>
>>> Name: Network-topa.166
>>> Author: topa
>>> Time: 21 October 2015, 8:26:14.656 pm
>>> UUID: d6d9910f-fa67-4c69-9a89-030c81233e90
>>> Ancestors: Network-topa.165
>>>
>>> UUIDGenerator
>>> - Use new Random>>#nextBytes:into:startingAt: (needs
Kernel-ul.960) for even more speed
>>> - Fix UUIDGenerator class>>#initialize to correctly register
at startup
>>> - Do not reset default on startup but rather reseed TheRandom
>>>
>>> Timings improved: '1,190,000 per second. 842 nanoseconds per
run.' (0.25 times slower than primitive version)
>>>
>>
>> This is outstanding. The UUID plugin has long been a source of
problems in
>> the VM, partly due to issues in various Linux distributions.
>>
>> http://bugs.squeak.org/view.php?id=7358
>>
>> Making the plugin unnecessary is a big improvement.
>
> Thats what I thought.
> Probably we want to present this (Mersenne PRNG + new UUID gen) to
> the Pharo core developers (cc) so that we can just remove the
UUID plugin
> from the VMs (cc vm-dev)?
>
> Best regards
> -Tobias
In the release version of Squeak 5.0, the Mersenne Twister is
initialized using a single seed restricted to 32bit.
Has this been changed since to use a wider ranged value?
Otherwise, you run into problems with potential collisions from
separate image starts rather too fast for UUID uses... (IMHO)
Cheers,
Henry
