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Re: [Bug-apl] OpenMP performance: first result

From: Juergen Sauermann
Subject: Re: [Bug-apl] OpenMP performance: first result
Date: Wed, 12 Mar 2014 13:02:03 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130330 Thunderbird/17.0.5

Hi David,

I guess the circle functions and ⋆/⍟ might do a better job in raising your motivation!

If I remember correctly then in 1990 we got a speedup of 5-6 on our 32 processor machine,
which means that the break-even point is at about 6 cores.

Unfortunately my own machine has only 2 cores.

/// Jürgen

On 03/12/2014 07:04 AM, David Lamkins wrote:
WIth the OpenMP patch I put together last night, adding two million-element vectors went from about 45ms without OpenMP to about 32ms with OpenMP.

That's evidence that OpenMP is doing *something*, even though the speedup is nowhere near commensurate with the number of cores (8 on this machine).

I wasn't expecting much at this early stage. I am, however, encouraged by the measurable result.

"The secret to creativity is knowing how to hide your sources."
Albert Einstein


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