OpenMP: thread creation/destruction in Java

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OpenMP: thread creation/destruction
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In OpenMP, threads are created with the parallel pragma:
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#pragma omp parallel { structured block }
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Each thread will independently execute the code within the structured block A structured block is just a block of statements with a single point of entry at the top and a single point of exit at the bottom The number of threads created in OpenMP can be either left to the operating system or controlled by the programmer (see the OpenMP appendix, Appendix A, for more details) Destruction of threads occurs at the end of the structured block The threads wait at the end of the structured block After all threads have arrived, the threads are destroyed and the original or master thread continues
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Java: thread creation/destruction
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In Java, threads are instances of the java1angThread class or a subclass of the Thread class A Thread object is instantiated in the usual way using the new keyword, and then the start method is invoked to launch the thread The thread thus created can access any variable visible according to Java's scope rules There are two ways to specify the behavior of a thread The first is to create a subclass of Thread and override the run method The following shows how to do this to create a thread that, when launched, will execute thread_body
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class MyThread extends Thread { public void run(){ thread_body }}
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To create and launch the thread one would write
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Thread t = new MyThread() ; //create thread object t start(); //launch the thread
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To use the second approach, we define a class that implements the java lang Runnable interface, which contains a single method public void run(), and pass an instance of the Runnable class to the Thread constructor For example, first we define the Runnable class:
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class MyRunnable implements Runnable { public void run(){ thread_body }}
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To create and execute the thread, we create a Runnable object and pass it to the Thread constructor The thread is launched using the start method as before:
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Thread t = new Thread(new MyRunnable()); //create Runnable //and Thread objects tstart(); //start the thread
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In most cases, the second approach is preferred[1]
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In Java, a class can implement any number of interfaces, but is only allowed to extend a
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single superclass Thus, extending Thread in the first approach means that the class defining the run method cannot extend an application specific class A thread terminates when the run method returns The Thread object itself will be collected after termination by the garbage collector in the same way as any other object in a Java program The javautilconcurrent package defines the Executor and Executor-Services interfaces and provides several classes implementing them These classes directly support higher level structures such as the Master/Worker pattern by arranging for the execution of Runnables while hiding the details of thread creation and scheduling More details are given in the Java appendix, Appendix C
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MPI: thread creation/destruction
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MPI is fundamentally based on processes It is thread aware in that the MPI 20 API [Mesa] defines different levels of thread safety and provides functions to query a system at runtime as to the level of thread safety that is supported The API, however, has no concept of creating and destroying threads To mix threads into an MPI program, the programmer must use a thread based programming model in addition to MPI 622 Process Creation/Destruction A process carries with it all the information required to define its place in the operating system In addition to program counters and registers, a process includes a large block of memory (its address space), system buffers, and everything else required to define its state to the operating system Consequently, creating and destroying processes is expensive and not done very often
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In older message passing APIs such as PVM [Sun90], the capability to create new processes was embedded in the API A programmer could issue a command called PVM_spawn to create a new process:
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PVM_Spawn(node, program-executable)
This capability of PVM allowed programmers to control which executables ran on which nodes from inside a program In MPI 11, however, this capability was not provided to the programmer and was left to the runtime environment This decision might seem like a step backwards, but it was done for two reasons One was the observation that the vast majority of PVM programs were based on the SPMD pattern, so it made sense to build this pattern into MPI Second, it allowed the standard to be implemented on a wider range of parallel architectures Many of the MPP computers available at the time the MPI Forum defined MPI could not easily handle a spawn statement For an example of process creation in MPI, consider an MPI program with an executable named foo The programmer launches the job on multiple processors (four in this example) with the command: