NAME

       allpairs_multicore - executes All-Pairs workflow in parallel on a multicore machine

SYNOPSIS

       allparis_multicore [options] <set A> <set B> <compare function>

DESCRIPTION

       allpairs_multicore  computes the Cartesian product of two sets (<set A> and <set B>), generating a matrix
       where each cell M[i,j] contains the output of the function F (<compare function>)  on  objects  A[i]  (an
       item in <set A>) and B[j] (an item in <set B>). The resulting matrix is displayed on the standard output,
       one comparison result per line along with the associated X and Y indices.

       For  large  sets  of  objects,  allpairs_multicore will use as many cores as you have available, and will
       carefully manage virtual memory to exploit locality and avoid thrashing. Because of this, you  should  be
       prepared  for  the  results  to come back in any order. If you want to further exploit the parallelism of
       executing All-Pairs workflows on multiple (multicore) machines, please refer  to  the  allpairs_master(1)
       utility.

OPTIONS

       -b, --block-size=<items>
              Block size: number of items to hold in memory at once. (default: 50% of RAM)

       -c, --cores=<cores>
              Number of cores to be used. (default: # of cores in machine)

       -e, --extra-args=<args>
              Extra arguments to pass to the comparison program.

       -d, --debug=<flag>
              Enable debugging for this subsystem.

        -v, --version
              Show program version.

        -h, --help
              Display this message.

EXIT STATUS

       On success, returns zero.  On failure, returns non-zero.

EXAMPLES

       Let's  suppose  you  have a whole lot of files that you want to compare all to each other, named a, b, c,
       and so on. Suppose that you also have a program named compareit that when invoked as compareit a  b  will
       compare files a and b and produce some output summarizing the difference between the two, like this:

                a b are 45 percent similar

       To use the allpairs framework, create a file called set.list that lists each of your files, one per line:

                a
                b
                c
                ...

       Then, invoke allpairs_multicore like this:

                % allpairs_multicore set.list set.list compareit

       The  framework  will  carry out all possible comparisons of the objects, and print the results one by one
       (note that the first two columns are X and Y indices in the resulting matrix):

                1    1    a a are 100 percent similar
                1    2    a b are 45 percent similar
                1    3    a c are 37 percent similar
                ...

COPYRIGHT

       The Cooperative Computing Tools are Copyright (C) 2005-2019 The University of Notre Dame.  This  software
       is distributed under the GNU General Public License.  See the file COPYING for details.

SEE ALSO

       •   The Cooperative Computing Tools ("http://ccl.cse.nd.edu/software/manuals")

       •   All-Pairs User Manual ("http://ccl.cse.nd.edu/software/manuals/allpairs.html")

       •   allpairs_master(1)

CCTools 8.0.0 DEVELOPMENT                                                                  allpairs_multicore(1)