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Azua_Garcia__Giovann

Beginner

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05-20-2012
12:27 PM

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dormqr exact flop count?

I would like to know the flop count of the function dormqr for some given parameters but I don't know where to find this information.

Likewise I would like to know the effective flop count for other functions such as dlarfp.

Can anyone advice?

TIA

Best regards,

Giovanni

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mecej4

Black Belt

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05-20-2012
04:18 PM

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ISBN-13: 978-0801854149

yuriisig

Beginner

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05-20-2012
11:38 PM

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Azua_Garcia__Giovann

Beginner

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05-21-2012
07:57 AM

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I have the book and I know the theoretical complexities, however, the effective complexity of LAPACK functions that MKL provides is of course not there :) this is not really a simple matrix multiplication because it has to implicitly recover the Q first and apply it automagically to some matrix or vector. This is not covered in that book. Likewise the darfl type of functions that generate one column reflector to annihilate the non zero elements of a new column is not easy to find out unless you are a LAPACK Fortran guru.

It is impossible to know if e.g. some updates are improving the situation if I have no idea what flop count every MKL function I call has.

TIA,

Best regards,

Giovanni

yuriisig

Beginner

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05-21-2012
12:10 PM

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