Re: Wolfram, meet Stefan and Boltzmann
- To: mathgroup at smc.vnet.net
- Subject: [mg117856] Re: Wolfram, meet Stefan and Boltzmann
- From: George Woodrow III <georgevw3 at mac.com>
- Date: Sat, 2 Apr 2011 02:40:00 -0500 (EST)
OK. This has gone on long enough that I want to add my experience:
In[1]:= 1+1
$Version
$ReleaseNumber
AbsoluteTiming[Integrate[x^3/(Exp[x]-1),{x,0,Infinity}]]
Out[1]= 2
Out[2]= 8.0 for Mac OS X x86 (64-bit) (February 23, 2011)
Out[3]= 1
Out[4]= {2.079332,\[Pi]^4/15}
This is on a 2010 iMac with 8 Gbytes RAM, but otherwise stock. Using the latest release of Snow Leopard (10.6.7).
On my MacBook Pro, I get a timing of 3.239342 seconds. This is a year older, but also has 8 Gbytes RAM running the OS X 10.6.7. It uses the faster GPU.
Since there seems to be no correlation between hardware and slow execution, there must be something else going on.
george
On Apr 1, 2011, at 3:34 AM, Peter Pein wrote:
> Am 31.03.2011 11:03, schrieb Curtis Osterhoudt:
>> Again, this happens on Linux, too. It's not limited to OS X
>>
>> In[1]:= 1 + 1
>>
>> Out[1]= 2
>>
>> In[2]:= $Version
>>
>> Out[2]= "7.0 for Linux x86 (32-bit) (November 11, 2008)"
>>
>> In[3]:= AbsoluteTiming[Integrate[x^3/(Exp[x] - 1), {x, 0, Infinity}]]
>>
>> Out[3]= {15.64583`7.645943600598422, \[Pi]^4/15}
> ...
> sorry, I can not reproduce your results:
> In[1]:= 1+1
> $Version
> $ReleaseNumber
> AbsoluteTiming[Integrate[x^3/(Exp[x]-1),{x,0,Infinity}]]
>
>
> Out[1]= 2
> Out[2]= 8.0 for Microsoft Windows (64-bit) (February 23, 2011)
> Out[3]= 1
> Out[4]= {1.6692030,\[Pi]^4/15}
>
> and similar results under Linux
>
> maybe a clean reinstall (uninstall Mathematica, reboot, install Mathematica) might help?
>
>
>