Expensive plugins

[John Arbash Meinel]

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Gordon Tyler wrote:
> Somewhat related to this, I was wondering why bzr explorer launches
> subprocesses for qbzr commands? Surely it would perform better and avoid
> command-line encoding issues if qbzr commands were invoked in-process?
> It would also avoid the weirdness on Mac where each qbzr command
> currently running appears as a separate icon in the Dock, in addition to
> the icon for bzr explorer itself.

Fairly different discussion, though probably worth having.

Short answer: process separation allowed them to avoid blocking the main
thread for gui updates. Also, bzrlib doesn't support multithreading
particularly well. (We generally avoid global objects, but multiple
users of a single Repository can have problems.)

I believe Gary has stated that he would like to avoid that, and has been
working on code to deal with it. (Having a dedicated GUI thread and a
dedicated Bzrlib thread, etc.)
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