[ADOL-C] ADOLC Speed Diff 1.8 vs 2.5.2

Brad Bell bradbell at seanet.com
Sat Dec 6 09:30:16 EST 2014

I would like to compare versions 1.8 and 2.5.2 of ADOLC on the speed 
tests that come with CppAD

I do not see version 1.8 in the ADOLC download page
nor do I see the corresponding releases below

What is the normal procedure for obtaining old releases of ADOLC ?

On 11/18/2014 2:26 PM, Scott Rasmussen @ Zaita wrote:
> Hey guys,
> First thanks Christian for helping with my previous issue (I never got 
> email link to reply).
> I've been working on a new modeling system to replace CASAL (produced 
> by NIWA in New Zealand). CASAL was built using ADOLC 1.8 in a custom 
> solver (FMM). I've re-implemented this same solver with ADOLC 1.8 and 
> 2.5 as different minimisers in my new model but the speed differences 
> between the two is HUGE.
> Minimisation with ADOLC 1.8 + FMM = 4 seconds
> with ADOLC 2.5 + FMM = 2.5 minutes
> with Numerical Diff (no autodiff) = 4 seconds
> This is a simple model but the differences in ADOLC speed is amazing. 
> My interface method with ADOLC is: http://pastebin.com/WGyZLRan
> A single iteration with 2.5.2 takes 3-4 seconds. All binaries minimise 
> to the same result.
> Is there any reason why ADOLC 2.5 would be that much slower than 1.8?
> Is there any way I can increase the speed of ADOLC?
> I notice it writes to files A LOT and not a huge amount of data (any 
> flags to keep this in memory?)
> Thanks,
> Scott

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