[Glass] UUID new >100x slower than Pharo?

[Paul DeBruicker]

Thanks Dale,

Tobias Pape replied off list that I should just use the FFI library as
Pharo is calling the libuuid on the platform anyway.  So I'll work on
that.

Paul





On 09/17/2013 10:44 AM, Dale K. Henrichs wrote:
> Paul,
> 
> First the call to userAction:onClient: does not imply that the operation is being done on the client. HostRandom operates against /dev/urandom on the server side so the cost you are seeing is likely just the overhead of accessing the file.
> 
> On my laptop the expression
> 
>   [1000 timesRepeat:[UUID new]] timeToRun
> 
> takes 800ms using HostRandom and 400ms using Lag25000CmwcRandom (not file-based although HostRandom is used to define initial seed) ... 
> 
> Still, there is a fair amount of Smalltalk code being executed here so a primitive call (which is what pharo does) would be the way to speed this up ...
> 
> I'll look into this for 3.2...(or at least making random number generation a lot faster)...
> 
> 
> Dale
> 
> 
> | From: "Paul DeBruicker" <pdebruic at gmail.com>
> | To: glass at lists.gemtalksystems.com
> | Sent: Tuesday, September 17, 2013 6:43:46 PM
> | Subject: [Glass] UUID new >100x slower than Pharo?
> | 
> | Hi-
> | 
> | This is on Glass 1.0.beta9.1 and Gemstone 3.1.0.4 using GemTools
> | 1.0.b71.  as the client.
> | 
> | Seems like its spending time looking up random numbers using file
> | accesses on the client.
> | 
> | [1000 timesRepeat:[UUID new]] timeToRun
> | 
> | On my laptop in pharo this takes 14ms and in gemstone it takes 1920
> | ms
> | 
> | 
> | Is there a way to get it to use the server as I thought that was much
> | faster?
> | 
> | Or is there a setting I need to fiddle with?
> | 
> | Thanks
> | 
> | Paul
> | 
> | 
> | 
> | Here is the output from:
> | 
> | ProfMonitor monitorBlock:[1000 timesRepeat:[UUID new]]
> | 
> | 
> | 
> | '================
> | STATISTICAL SAMPLING RESULTS
> | elapsed CPU time:    12308 ms
> | monitoring interval: 1.0 ms
> | 
> |  tally       %   class and method name
> | ------   -----   --------------------------------------
> |   2298   18.69   GsFile                    >> userAction:onClient:
> |   1258   10.23   HostRandom                >> integer
> |   1111    9.04   SmallInteger              >> bitShift:
> |    944    7.68   GsFile                    >> next
> |    914    7.43   Character                 >> asciiValue
> |    906    7.37   GsFile