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Parallelism.md
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The typical scheme is the following:
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The typical scheme is the following:
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#) The program (IRPF90) asks `qp_run` to create a new queue for a state of the calculation
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1. The program (IRPF90) asks `qp_run` to create a new queue for a state of the calculation
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#) The program adds multiple tasks to do to the queue
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2. The program adds multiple tasks to do to the queue
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#) The program starts a **collector** thread that waits for the results computed by the workers
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3. The program starts a **collector** thread that waits for the results computed by the workers
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#) The program starts multiple **worker** threads that will fetch tasks to do from the queue, compute the corresponding task, and send the result directly to the collector. Then, the queue is informed that the task has been done
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4. The program starts multiple **worker** threads that will fetch tasks to do from the queue, compute the corresponding task, and send the result directly to the collector. Then, the queue is informed that the task has been done
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#) When the queue is empty and all workers have sent their results, the last worker receives from `qp_run` a *control* integer, and sends it to the collector thread
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5. When the queue is empty and all workers have sent their results, the last worker receives from `qp_run` a *control* integer, and sends it to the collector thread
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#) The collector thread checks that the control integer is correct : this can be for instance the number of AOs to compute and the number of actually computed AOs.
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6. The collector thread checks that the control integer is correct : this can be for instance the number of AOs to compute and the number of actually computed AOs.
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#) The parallel section is terminated
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7. The parallel section is terminated
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The task scheduler
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The task scheduler
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