On Thu, 22 Oct 2015, Henrik Johansen wrote:

>
>> On 22 Oct 2015, at 2:49 , Tobias Pape <Das.Linux at gmx.de> wrote:
>>
>>
>>
>> On 22.10.2015, at 14:37, David T. Lewis <lewis at mail.msen.com> wrote:
>>
>>> On Thu, Oct 22, 2015 at 06:28:09AM +0000, commits at source.squeak.org 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)

No, that's still something to be done[1].

Levente

[1] http://lists.squeakfoundation.org/pipermail/squeak-dev/2015-October/186409.html

>
> Cheers,
> Henry
>