[Glass] UUID new is pretty slow ...

Dale Henrichs via Glass glass at lists.gemtalksystems.com
Wed Jul 1 13:15:19 PDT 2015

Pushed Martin's FastUUIDGenerator class to glassdb/glass, so if you use 
GsUpgrade class>>upgradeGLASS1, you'll get the latest release.

With this release, FastUUIDGenerator becomes the default UUIDGenerator 
class for UUID for GemStone 3.x.


[1] https://github.com/GsDevKit/GsDevKit/issues/69

On 07/01/2015 09:18 AM, Dale Henrichs wrote:
> Martin,
> Great! ... I've started looking into incorporating your implementation 
> into the standard GsDevKit/GLASS code base.
> Dale
> On 06/30/2015 01:12 PM, Martin McClure via Glass wrote:
>> On 06/30/2015 07:53 AM,itlists at schrievkrom.de  via Glass wrote:
>>> ... I was not aware of it. I created 11000 objects from a CSV file and
>>> to get IDs within these objects I use the UUID class of Gemstone.
>>>   It took very long and I found out, that the creation of the 11000
>>> objects took pretty long ... until I found, that "UUID new" was the
>>> reason for that. It is very expensive. Calling this method 11000 times
>>> took 5.1s (average).
>>>   I now use native libraries from Linux and now creating 11000 UUIDs
>>> takes around 0.3 to 0.5 seconds.
>> I think the current GemStone implementation of UUID generation was taken
>> from Squeak a number of years ago. I took a look at how it's
>> implemented, and it's done just about the slowest way imaginable. So I
>> made a simpler, faster implementation. I believe it's compatible with
>> the existing implementation, just faster. Attached is a replacement for
>> the class UUIDGenerator that is almost 100x faster -- I can generate
>> 11000 UUIDs in about 0.02 seconds with pure Smalltalk, so it might be
>> even faster than using native libraries.
>> This was done on the latest unreleased GemStone, but will probably work
>> in any 3.x version. If you try it, let me know what results you get.
>> Regards,
>> -Martin
>> _______________________________________________
>> Glass mailing list
>> Glass at lists.gemtalksystems.com
>> http://lists.gemtalksystems.com/mailman/listinfo/glass

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