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<HTML>
<HEAD>
<TITLE>Package edu.rit.pj</TITLE>
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Package edu.rit.pj contains Parallel Java (PJ),
an API and middleware for parallel programming in 100% Java
on shared memory multiprocessor (SMP) parallel computers,
cluster parallel computers,
and hybrid SMP cluster parallel computers.
<P>
PJ includes the following classes for thread-based parallel programming
inspired by the OpenMP standard.
<UL>
<LI>Class <A HREF="ParallelTeam.html">ParallelTeam</A>
<LI>Class <A HREF="ParallelConstruct.html">ParallelConstruct</A>
<LI>Class <A HREF="ParallelRegion.html">ParallelRegion</A>
<LI>Class <A HREF="ParallelForLoop.html">ParallelForLoop</A>
<UL>
<LI>Class <A HREF="IntegerForLoop.html">IntegerForLoop</A>
<LI>Class <A HREF="IntegerStrideForLoop.html">IntegerStrideForLoop</A>
<LI>Class <A HREF="LongForLoop.html">LongForLoop</A>
<LI>Class <A HREF="LongStrideForLoop.html">LongStrideForLoop</A>
</UL>
<LI>Class <A HREF="Schedule.html">Schedule</A>
<UL>
<LI>Class <A HREF="IntegerSchedule.html">IntegerSchedule</A>
<LI>Class <A HREF="LongSchedule.html">LongSchedule</A>
</UL>
<LI>Class <A HREF="ParallelIteration.html">ParallelIteration</A>
<LI>Class <A HREF="ParallelSection.html">ParallelSection</A>
<LI>Class <A HREF="BarrierAction.html">BarrierAction</A>
<LI>Class <A HREF="Lock.html">Lock</A>
<LI>Thread safe shared reduction variable classes in package
<A HREF="reduction/package-summary.html">edu.rit.pj.reduction</A>
<LI>Binary operation classes for parallel reduction in package
<A HREF="reduction/package-summary.html">edu.rit.pj.reduction</A>
<LI>Class <A HREF="PJProperties.html">PJProperties</A>
</UL>
When such a program runs on an SMP parallel computer,
the Java Virtual Machine (JVM)
schedules each thread on a separate processor,
thus executing the program in parallel.
Although PJ achieves the same effect as OpenMP,
PJ programs are coded differently from OpenMP programs.
OpenMP uses pragmas or directives
that must be translated by a precompiler.
PJ uses Java classes and needs no precompiler.
<P>
PJ includes the following classes for message passing parallel programming
inspired by the MPI standard.
<UL>
<LI>Class <A HREF="Comm.html">Comm</A>
<LI>Class <A HREF="CommRequest.html">CommRequest</A>
<LI>Class <A HREF="CommStatus.html">CommStatus</A>
<LI>Class <A HREF="../mp/Buf.html">Buf</A> and its subclasses in package <A HREF="../mp/package-summary.html">edu.rit.mp</A>
<LI>Item, array, and matrix buffer classes in package <A HREF="../mp/buf/package-summary.html">edu.rit.mp.buf</A>
<LI>Binary operation classes for parallel reduction in package
<A HREF="reduction/package-summary.html">edu.rit.pj.reduction</A>
<LI>Class <A HREF="PJProperties.html">PJProperties</A>
</UL>
<P>
PJ includes the following classes
that provide the <I>master-worker</I> pattern
for automatic loop partitioning and load balancing
in message passing parallel programs.
<UL>
<LI>Class <A HREF="WorkerTeam.html">WorkerTeam</A>
<UL>
<LI>Class <A HREF="HybridTeam.html">HybridTeam</A>
</UL>
<LI>Class <A HREF="WorkerConstruct.html">WorkerConstruct</A>
<LI>Class <A HREF="WorkerRegion.html">WorkerRegion</A>
<LI>Class <A HREF="WorkerForLoop.html">WorkerForLoop</A>
<UL>
<LI>Class <A HREF="WorkerIntegerForLoop.html">WorkerIntegerForLoop</A>
<LI>Class <A HREF="WorkerIntegerStrideForLoop.html">WorkerIntegerStrideForLoop</A>
<LI>Class <A HREF="WorkerLongForLoop.html">WorkerLongForLoop</A>
<LI>Class <A HREF="WorkerLongStrideForLoop.html">WorkerLongStrideForLoop</A>
</UL>
</UL>
<P>
When such a program runs on a cluster parallel computer,
the PJ message passing middleware
runs multiple copies of the program,
each in its own process
on a different backend processor of the cluster,
thus executing the program in parallel.
PJ's message passing API is similar to that of MPI,
except PJ's is an object oriented Java API.
<P>
For further information about the PJ message passing middleware,
see package <A HREF="cluster/package-summary.html">edu.rit.pj.cluster</A>.
<P>
For further information about OpenMP,
see the OpenMP Home Page
(<A HREF="http://www.openmp.org/" TARGET="_top">http://www.openmp.org/</A>).
<P>
For further information about MPI,
see the MPI Standard
(<A HREF="http://www-unix.mcs.anl.gov/mpi/" TARGET="_top">http://www-unix.mcs.anl.gov/mpi/</A>).
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