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I don't understand what this means... Can you explain? Here's my basic understanding: MRI is a single process, with multiple threads... They can't run in para

by canadev 12y ago

I don't understand what this means... Can you explain? Here's my basic understanding: MRI is a single process, with multiple threads... They can't run in parallel because of the global interpreter lock (which is used because the code in MRI is not thread safe? Meaning each thread can touch the same memory and may leave it in a broken state for another thread, so we lock access to it first...). So: there are multiple threads, I am guessing each with their own task (maybe one to run the code, one to do garbage collection, ... I have no idea), but because of the GIL they can't be parallelized. Still multi-threaded anyway.

nitrogen 12y ago
You can create multiple OS-level threads in MRI using Thread.new. Those threads can run code at the same time, just not Ruby code. There is a function that C extensions are supposed to call while running I/O that can block, or while running CPU-intensive non-Ruby code, that releases the global lock.