I would also think we have some unit tests that validate the random generator.
On 29 Jun 2016, at 10:07, Max Leske <maxleske@gmail.com> wrote:
Same here of OS X 10.11 in Pharo 6. Not reproducible.
Max
On 29 Jun 2016, at 09:34, Ben Coman <btc@openInWorld.com> wrote:
On Windows 7, I tried two case and could not reproduce this.
1. Pharo-40611 C:\#Pharo\Pharo4.0\Pharo.exe NBCoInterpreter NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 uuid: e0df6e2d-5694-40e2-8035-dc217200b424 Sep 25 2014 NBCogit NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 uuid: e0df6e2d-5694-40e2-8035-dc217200b424 Sep 25 2014
Note the same VM as yours
2. Pharo-50554 C:\#Pharo\PharoSpur\Pharo.exe CoInterpreter VMMaker.oscog-eem.1630 uuid: 2ed025ea-f400-4440-8e8b-5aa46d06c9ab Jan 14 2016 StackToRegisterMappingCogit VMMaker.oscog-eem.1630 uuid: 2ed025ea-f400-4440-8e8b-5aa46d06c9ab Jan 14 2016 https://github.com/estebanlm/pharo-vm.git Commit: 21ec004cce7d26010c18d357c805a0e1a4ffe376 Date: 2016-01-14 11:42:33 +0100 By: Esteban Lorenzano <estebanlm@gmail.com> Jenkins build #498
Could you try some other combinations of machine/VM/image?
cheers -ben
On Wed, Jun 29, 2016 at 12:15 PM, Benoit St-Jean via Pharo-dev <pharo-dev@lists.pharo.org> wrote:
---------- Forwarded message ---------- From: Benoit St-Jean <bstjean@yahoo.com> To: Pharo Development List <pharo-dev@lists.pharo.org> Cc: Date: Wed, 29 Jun 2016 04:13:57 +0000 (UTC) Subject: Random number generator bug? I'm having problems understanding why the Integer>>#atRandom sometimes return a number greater than the receiver.
This problem only occurs when forking processes that generate random number using the above mentioned method. Obviously, all processes share the same RNG from the Collection class.
Code below can reproduce (most of the time) the bug.
| n | n := 3172918. 5 timesRepeat: [ [n timesRepeat: [ | alea | alea := n atRandom. (alea > n) ifTrue: [ self halt]]] forkAt: Processor userBackgroundPriority ].
I'm on Windows 10, Pharo4.0 Latest update: #40627.
Pertinent System Reporter info below:
Virtual Machine --------------- F:\Pharo4\Pharo4.0\Pharo.exe NBCoInterpreter NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 uuid: e0df6e2d-5694-40e2-8035-dc217200b424 Sep 25 2014 NBCogit NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 uuid: e0df6e2d-5694-40e2-8035-dc217200b424 Sep 25 2014 https://github.com/pharo-project/pharo-vm.git Commit: 81b5d19917dcb78f22482a780deec48c53738396 Date: 2014-09-20 14:36:18 +0200 By: Esteban Lorenzano <estebanlm@gmail.com> Jenkins build #14858
Win32 built on Sep 25 2014 17:47:04 Compiler: 4.6.2 VMMaker versionString https://github.com/pharo-project/pharo-vm.git Commit: 81b5d19917dcb78f22482a780deec48c53738396 Date: 2014-09-20 14:36:18 +0200 By: Esteban Lorenzano <estebanlm@gmail.com> Jenkins build #14858 NBCoInterpreter NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 uuid: e0df6e2d-5694-40e2-8035-dc217200b424 Sep 25 2014 NBCogit NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 uuid: e0df6e2d-5694-40e2-8035-dc217200b424 Sep 25 2014
Loaded VM Modules ----------------- B2DPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) BitBltPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) FT2Plugin Freetype-Plugin-IgorStasenko.64 (e) FilePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) FloatArrayPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) JPEGReadWriter2Plugin VMMaker.oscog-jeanbaptistearnaud.783 (i) Kernel32 LargeIntegers v1.5 VMMaker.oscog-jeanbaptistearnaud.783 (i) LocalePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) Matrix2x3Plugin VMMaker.oscog-jeanbaptistearnaud.783 (i) MiscPrimitivePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) NativeBoostPlugin NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 (i) SecurityPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) ZipPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i)
VM Built-in Modules ------------------- ADPCMCodecPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) AsynchFilePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) B2DPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) B3DAcceleratorPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) BMPReadWriterPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) BitBltPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) CroquetPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) DSAPrims VMMaker.oscog-jeanbaptistearnaud.783 (i) DropPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) FFTPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) FilePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) FloatArrayPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) FloatMathPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) HostWindowPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) IA32ABI VMMaker.oscog-jeanbaptistearnaud.783 (i) JPEGReadWriter2Plugin VMMaker.oscog-jeanbaptistearnaud.783 (i) JPEGReaderPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) JoystickTabletPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) Klatt VMMaker.oscog-jeanbaptistearnaud.783 (i) LargeIntegers v1.5 VMMaker.oscog-jeanbaptistearnaud.783 (i) LocalePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) MIDIPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) Matrix2x3Plugin VMMaker.oscog-jeanbaptistearnaud.783 (i) MiscPrimitivePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) Mpeg3Plugin VMMaker.oscog-jeanbaptistearnaud.783 (i) NativeBoostPlugin NativeBoost-CogPlugin-HolgerHansPeterFreyther.21 (i) RePlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) SecurityPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) SerialPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) SocketPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) SoundCodecPrims VMMaker.oscog-jeanbaptistearnaud.783 (i) SoundPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) StarSqueakPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) SurfacePlugin Sep 25 2014 (i) UUIDPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i) Win32OSProcessPlugin VMConstruction-Plugins-OSProcessPlugin.oscog-EstebanLorenzano.43 (i) ZipPlugin VMMaker.oscog-jeanbaptistearnaud.783 (i)
VM Configuration ---------------- F:\Pharo4\Pharo4.0\Pharo.ini [Global] DeferUpdate=1 ShowConsole=0 DynamicConsole=1 ReduceCPUUsage=0 ReduceCPUInBackground=0 3ButtonMouse=0 1ButtonMouse=0 UseDirectSound=1 PriorityBoost=0 B3DXUsesOpenGL=0 CaseSensitiveFileMode=0
Operating System/Hardware ------------------------- Win32 6.2 IX86
Hardware Details ---------------- Hardware information: Manufacturer: Unknown Model: Unknown Number of processors: 4 Page size: 4096
Memory Information (upon launch): Physical Memory Size: 2097151 kbytes Physical Memory Free: 2097151 kbytes Page File Size: 4194303 kbytes Page File Free: 4194303 kbytes Virtual Memory Size: 2097024 kbytes Virtual Memory Free: 2015568 kbytes Memory Load: 45 percent
Processor 0: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Identifier: Intel64 Family 6 Model 94 Stepping 3 ~MHZ: 2712
Processor 1: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Identifier: Intel64 Family 6 Model 94 Stepping 3 ~MHZ: 2712
Processor 2: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Identifier: Intel64 Family 6 Model 94 Stepping 3 ~MHZ: 2712
Processor 3: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Identifier: Intel64 Family 6 Model 94 Stepping 3 ~MHZ: 2712
Graphics Hardware Details ------------------------- Display Information: Graphics adapter name: Intel(R) HD Graphics 530 Primary monitor resolution: 1280 x 720
Device: ??? Adapter String: Intel(R) HD Graphics 530 Bios String: Intel Video BIOS Chip Type: Intel(R) HD Graphics Family DAC Type: Internal Memory Size: 0x40000000
Driver Versions: igdumdim64:
----------------- Benoît St-Jean Yahoo! Messenger: bstjean Twitter: @BenLeChialeux Pinterest: benoitstjean Instagram: Chef_Benito IRC: lamneth Blogue: endormitoire.wordpress.com "A standpoint is an intellectual horizon of radius zero". (A. Einstein)