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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?
> 
> 
> 



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