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concurrency is the interleaving of processes in time to give the appearance of simultaneous execution. Thus it differs from parallelism, which offers genuine simultaneous execution. However the issues and difficulties raised by the two overlap to a large extent:

• sharing global resources safely is difficult;

• optimal allocation of resources is difficult;

• locating programming errors can be difficult, because the contexts in which errors occur cannot always be reproduced easily.

Parallelism also introduces the issue that different processors may run at different speeds, but again this problem is mirrored in concurrency because different processes progress at different rates.

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