Re: [BLACKBOX] INTEGER arithmetic speed

From: Campbell, Robert (SELEX GALILEO, UK) <robert.d.campbell{([at]})nowhere.xy>
Date: Thu, 20 Oct 2011 13:56:14 +0100

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>> > It would be interesting to know if anyone had observed
>> this LONGINT
>> > speed-up on an Intel machine.
>> >
>>
>> No - just the opposite. A *very* simple multiplication test
>> on an Intel
>> 64-bit single-core Pentium 4 system gave results that were slower for
>> LONGINT by a factor of about 8! That is more like the sort
>> of result I would
>> have expected.
>>
>> Chris


I have just copied my entire BlackBox director onto a stick, and run my
example, without any
recompiling or anything, on a relatively new Intel box:


AMD box, LONGINTs 19.8 s
AMD box, INTEGERs 34.0 s

Intel box, LONGINTs 15.3 s
Intel box, INTEGERs 6.4 s.


Wow!


I have a 'standard' speed test I have use on many languages & machines
over decades. It (deliberately) looks
at tight loops using 64-bit floating point & trig functions (Sine &
Cosine). I have just run it on these machines:

AMD, REALs 57.9
Intel, REALs 44.7.

The 3-year newer Intel box is about 29% faster for both REALs &
LONGINTs.
It is over 5 times faster for INTEGERs.


Robert
SELEX Galileo Ltd
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL
A company registered in England & Wales. Company no. 02426132
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Received on Thu Oct 20 2011 - 14:56:14 UTC