Re: Make Colt-lib: DynamicBin1D Thread safe.

[Andreas Tille <andreas@an3as.eu>]

Hi Malavika,

thanks for your problem report about the Debian packaged libcolt-java.
In general it is advised to use the

   reportbug

tool to issue this kind of bug reports since it submits more detailed
information (like for instance the JVM you are using).

Moreover in the specific case of colt it seems to be a concern for the
upstream developer.  I included the address that is known to us in CC
but we had trouble contacting Wolfgang Hoschek in the past which we
tried seriosly since libcolt-java contains src/hep.aida.* which has no
free license.  The code does not seem to be maintained any more since
we did not got any answer so far.

For sure we try to deal in cases where upstream is not responding also
in Debian to add patches but I must admit at least for myself that my
Java knowledge is so low that I do not even understand the problem you
want to demonstrate with the code below.  What do we need to do with
this code what is your result and what result would you expect instead?
Could you possibly provide a patch which solves your problem?

Kind regards

        Andreas.

On Mon, Dec 16, 2013 at 09:51:27AM +0400, Malavika wrote:
> Hello,
> 
> I am using the Debian Colt library version 1.2.0 for some heavy
> calculations and I see that my system deadlocks randomly. The simplified
> test case to reproduce the deadlock is given below. The library is claimed
> to be thread safe but deadlocks are found.
> 
> 
> import hep.aida.bin.DynamicBin1D;
> import cern.colt.function.DoubleDoubleFunction;
> import cern.colt.matrix.DoubleFactory1D;
> import cern.colt.matrix.DoubleFactory2D;
> import cern.colt.matrix.DoubleMatrix1D;
> import cern.colt.matrix.DoubleMatrix2D;
> import cern.colt.matrix.DoubleMatrix3D;
> import cern.jet.random.engine.RandomEngine;
> public class OmenTestCase34 {
> 
> 
>         public static void main(String args[])
>         {
>                 DynamicBin1D bin = new DynamicBin1D();
>                 DynamicBin1D bin2 = new DynamicBin1D();
>                 double[] v1 = { 1, 2, 3, 4, 5, 6, 7, 8, 9,10,  21,
> 22,23,24,25,26,27,28,29,30,31};
>                 double[] v2 = {10,11,12,13,14,15,16,17,18,19,  20,
> 30,31,32,33,34,35,36,37,38,39};
>                 bin2.addAllOf(new cern.colt.list.DoubleArrayList(v1));
>                 bin2.addAllOf(new cern.colt.list.DoubleArrayList(v2));
>                 CovarianceCalculator t1 = new CovarianceCalculator(bin,
> bin2);
>                 t1.start();
>                 CorrelationCalculator t2 = new CorrelationCalculator(bin,
> bin2);
>                 t2.start();
>         }
> 
> }
> class CovarianceCalculator extends Thread {
>         DynamicBin1D l2;
>         DynamicBin1D l3;
>         public CovarianceCalculator(DynamicBin1D bin, DynamicBin1D bin2) {
>                 l2 = bin;
>                 l3 = bin2;
>         }
> 
>         public void run() {
>                 System.out.println(l3.covariance(l2));
>         }
> }
> 
> class CorrelationCalculator extends Thread {
>         DynamicBin1D l2;
>         DynamicBin1D l3;
>         public CorrelationCalculator(DynamicBin1D bin, DynamicBin1D bin2) {
>                 l2 = bin;
>                 l3 = bin2;
>         }
> 
>         public void run() {
>                 System.out.println(l2.correlation(l3));
>         }
> }
> 
> Regards,
> Malavika
> 
> 
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