Re: [eigen] compile time statistics |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] compile time statistics*From*: "Gael Guennebaud" <gael.guennebaud@xxxxxxxxx>*Date*: Tue, 17 Jun 2008 13:34:47 +0200*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:in-reply-to:mime-version:content-type:references; bh=94sODZ7MRvospFmWsZf31YWSHfZdFFfyxbk11MfLdaU=; b=bAOkRZ6+Qmot5MJs1Fb85C01KgKYqR71BqrX754EhCCFFLRuz8jr8h8Pk1lCWkjBF0 AZfKR0FlCixJ6WMnEqO2M/KYq6egIp1DHE41WhaPpiY9Kx/W8BGAY7gQzW7iV2gY0kRn JXZ3YvwAnYoEHf/RIY2zJgseAV1K+cffhzHJE=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version :content-type:references; b=HfN2H3Mp3EoC38ZLh5q2ko669FElnEnS9Biu9K++SA8HBnEnXYpTmRKp0gpH51faNn 9/xZMWim16JUTczbUZsHGgpVkVzOTZtLVnptPewPM7hoMrOqPPPm+wdxzY4FG+Qgi9kh l82SwRHIwchQ0rzTcbxe7WlvYhV8tJ/J8sZNU=

arf, sorry. for the cost model bench note that the number of loops depends on the size of the matrices, so you cannot really compare 2 "rows". Moreover the number of loops for the scalar product is divided by two. The purpose was to get a similar running time for all cases. That is weird is that the scalar product is mush slower than the matrix sum, maybe we could try a cwise product to see what happens.... gael. On Tue, Jun 17, 2008 at 1:19 PM, Benoît Jacob <jacob@xxxxxxxxxxxxxxx> wrote: > On Tuesday 17 June 2008 13:07:38 Gael Guennebaud wrote: >> Hi, >> >> I attached > > you forgot to :) > > but thanks a lot, really looking forward to seeing your stats. Very useful. > > While I'm there : I'm currently running myself the eigencostmodel benchmark. > I'm still totally puzzled by the fact that 8x4x8 is so fast, and generally > that the bigger sizes are the faster ones, the only explanation I guess is > vectorization, i'll retry with implicit vectorization disabled (i was already > not using explicit vectorization). > > Benoit >

**Attachment:
EigenCompilationTime_02.ods**

**Follow-Ups**:**Re: [eigen] compile time statistics***From:*Benoît Jacob

**References**:**[eigen] compile time statistics***From:*Gael Guennebaud

**Re: [eigen] compile time statistics***From:*Benoît Jacob

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