2021年3月26日 · The parallel mode symbol of two horizontal lines is a flowchart notation used to indicate a set of processes that can be done in parallel. That is, everything between those bars could happen at the same time, but it's not necessary.

Parallel means in the same direction without crossing, without being in eachother's way. So, concurrency implies competing for the same resource. Parallelism does not. Parallel processes may be using the same resource but it is not considered a problem, it is not an issue. With concurrency, it is an issue to be dealt with.

2012年4月11日 · But also recognize that your application (without explicitly setting thread priority) will have to share time on the core with other processes. Meaning, optimal threading depends on a number of factors. By default, I'd let the system manage threading for me. The Task Parallel Library is the best route for that currently.

2020年5月25日 · I am new to UML sequence diagrams. I saw a few YouTube videos and a few tutorials such as this one. I have a system with multiple inputs, that can interact with the system asynchronously.

2017年6月30日 · If I fork two memory-bound processes, then when I switch between them, I'm going to have to swap out the memory of one to swap in the memory of the other, at which point the CPU idles waiting for the memory to swap in. High performance applications typically carefully manage scheduling to get the best disk access patterns and make sure ...

2023年9月28日 · SQLite processes use a series of locks to handle concurrency; to read, several processes can obtain a SHARED lock. A process that writes, will need to obtain a RESERVED lock, and only when actually having to flush changes to disk does it move to the PENDING state.

2014年5月7日 · I'm modelling part of a software architecture on which several processes run as a workflow. The architecture involves data parallelism, where a certain serial process produces N pieces of data which need to be distributed to N processes that must run in parallel. I'm looking for a good way of expressing parallelism in a diagram.

2018年11月16日 · In another question (Diagram to express parallelism in a process workflow), informal representations are suggested already in the question, which I think work in the sense of communicating to the reader of a diagram that parallel processing takes place, but are I think not well-formed UML in the sense of modelling tools like Enterprise Architect.

2018年5月11日 · In the case of the sneaky trick question, if A and B both happen to rely upon process C that happens to take 9 seconds and when it finishes happens to return results such that parallel queries are responded to in parallel (but subsequent queries are reevaluated), then sure, it's possible to speed up the process with parallelization.

2023年3月21日 · Any behavioral UML diagram is in order for a multi-threaded application. Some behavioral diagrams like activity diagrams include notations for concurrency, but in general, I feel there is no need to treat multi-threaded applications as a special case of UML diagrams, they're just like any other application.