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MathGroup Archive 2004

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Timing anomaly

  • To: mathgroup at smc.vnet.net
  • Subject: [mg50349] Timing anomaly
  • From: koopman at sfu.ca (Ray Koopman)
  • Date: Sat, 28 Aug 2004 04:38:02 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Has anyone else noticed a slowdown 
in the first call to Timing in a cell?

In[1]:= t := First@Timing@Do[Null,{1*^7}]/($TimeUnit Second)

In[2]:= {t,t,t,t,t}  (* the first call is slow *)
Out[2]= {74.,61.,61.,60.,62.}

The next cell contains two input expressions that are entered 
simultaneously; only the first call in the first expression is slow.

In[3]:= {t,t,t,t,t}
        {t,t,t,t,t} 
Out[3]= {74.,61.,61.,60.,61.}
Out[4]= {61.,61.,62.,64.,60.}

In[5]:= Table[t,{10}]
Out[5]= {71.,58.,60.,62.,60.,61.,60.,61.,60.,60.}

The next cell was entered while Table in the previous cell 
was still running; the first call is not slow.

In[6]:= {t,t,t,t,t}  
Out[6]= {58.,61.,59.,61.,61.}

In[7]:= $Version
Out[7]= 5.0 for Mac OS X (November 19, 2003)


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