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I am trying to list the times in which it is useful to run some code in a separate process. Does the following short list cover it?

  1. Speed: the obvious one.

    • Multiprocess/distributed parallism
    • Worker process, vs GUI process for responsiveness of UI etc
  2. Security:

    • No shared-memory space decreases attack vectors
    • Part of (but not all of) sandboxing
  3. Ability to interrupt on time out: This is a bit of a hack

    • Rather than filling all code with checks to see if have hit a time out condition, run it in its own process, and have a watch dog timer in the main process, which will trigger and interrupt vis SIGINT or failing that SIGKILL on the process doing the work after a timeout.
  4. Unreliable libraries

    • Sometimes you find youself needing to use a library this is not reliable.
    • You can wrap that library into its own (actor) process
    • For example:
      • it might leak memory internally: solvable by restarting the process c
      • It might on certain corner-cases just segfault. Running it in its own process lets it crash without bringing down the whole process. So you can fail gracefully or restart the wrapper process.
    • Obviously one wish to avoid that by replacing the library. But one can't always do that immediately. And sometimes as a bussiness decision it might not be worth it.
  5. External Tools

    • some tools are entire programs that are run on the commandline via. Obviously they run in their own process

Does that cover all the cases?

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    What is the point of making such a list? Note that "list of things" questions will typically get closed as "too broad" – Doc Brown May 11 '17 at 6:47
  • Using multiple process doesn't improve performance over multiple threads in a single process in most scenarios. – CodesInChaos May 11 '17 at 8:17
  • @DocBrown One tends to differenciate between Long Lists, and short lists. Short list have a fixed length. As compaired to long lists which tend to be more or less shopping questions. – Lyndon White May 11 '17 at 8:22
  • @CodesInChaos that does not change that using multiple processes is used for speed. (It has pros and cons vs multiple threads) – Lyndon White May 11 '17 at 8:24
  • Well, I guess by thinking a while about this question this list can become at least medium sized ;-) So I don't see how there can be a "right" answer. – Doc Brown May 11 '17 at 8:48
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Add to that list:

  1. Programming Language Incompatibilty

    You need to use a third party library for a specific task that has only a C interface while rest of your program is in Java.

  2. Compiler Version Incompatibility

    You need to use a third party library for a specific task that is available only with a VS2010 build while rest of your program is in VS2015.

  3. Independent Distribution

    You might find value in distributing/selling the two programs independently.

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