> 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)

Cheers,
Henry
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