When the two threads (or processes) are executed on two different cores (or processors), you have parallelism. ! It is possible to have parallel concurrent execution, where threads are distributed among multiple CPUs. That is to say, they're working towards the same goal. See a demonstration on multiple threads executing concurrently on a single processor and then executing in parallel on multiple processors to achieve greater throughput, and gain an understanding of why parallel execution requires parallel hardware. Concurrent. Parallelism, a very important concept in java multi-threading concepts. Something happening independently at the exact same time. In addition, concurrent has a few additional meanings, most of which amount to "in agreement," as in "two people working concurrently." Concurrent (adjective) Involving more than one thread of computation. The diagram below illustrates parallel concurrent execution. Moreover, some use term parallel processing for two or more active processes sharing the same processor concurrently. Parallel. However, when they are placed in the context of a worker system that improves the flexibility and scalability of application production, their use cases become very clear. This means that it works on only one task at a time and the task is never broken into subtasks. If two tasks are running concurrently, but are not running in parallel, they must be able to stop and resume their progress. Neither parallel nor concurrent. Concurrent vs. An application can be neither parallel nor concurrent. We mentioned concurrent behaviors once when discussing the async programming model. This is an important distinction. for instance, you can have two threads (or processes) executing concurrently on the same core through context switching. A background worker then is "concurrent" (with the UI main thread) while tasks running in parallel on multiple cores are ..uh, "parallel." In an async programming model, tasks are treated as a single step that runs multiple tasks, and they do not care about how those tasks are ordered or run to each other. Happy Learning ! Concurrent (adjective) Running alongside one another on parallel courses; moving together in space. Concurrent vs. We mentioned concurrent behaviors once when discussing the async programming model. Consider you are given a task of singing and eating at the same time. An application can be both parallel – and concurrent, which means that it processes multiple tasks concurrently in multi-core CPU at same time . In an async programming model, tasks are treated as a single step that runs multiple tasks, and they do not care about how those tasks are ordered or run to each other. Note that, in this case, only one process can be in running state. An application can be parallel but not concurrent means that it only works on one task at a time and the tasks broken down into subtasks can be processed in parallel. That’s all about Concurrency vs. Parallel. $\begingroup$ Yes, concurrent and parallel programming are different. The other meaning of concurrent is related to geometry, where you might say two lines were concurrent: they're going to intersect at a common point. "the concurrent jurisdiction of courts" Concurrent (adjective) Meeting in one point. Thus, the threads executed on the same CPU are executed concurrently, whereas threads executed on different CPUs are executed in parallel. Concurrency & Parallelism Concurrency. Tasks that are in progress at the same time, but not necessarily progressing simultaneously. Parallel. Parallelism Parallel Concurrent Execution. But I recently used the term "concurrent" in an article about applying machine learning models (e.g., CNTK) to large sets of data for classification purposes. 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