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I quote from the stackless mailinglist:

"Go is stackless where Stackless is not. Its goroutines use allocated stacks (starting at 4k in size) and can continue running on different threads where Stackless tasklets cannot. In fact, when a goroutine blocks on a system call, the other goroutines in its scheduler are migrated to another thread."

So stakcless is not really concurrent at all, given that, it is no wonder performance is different given that the functionality provided by stackless 'microthreads' is in no way comparable to goroutines.

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