It's not clear why when you use "a set of per-thread caches" you "lose advantages of bump allocator". At any point of time, a single goroutine is executed on a thread. The points when a goroutine gains and loses the execution context of a thread, and when it is transferred from one thread to another are known to runtime. At those points a goroutine could cache (eg in a register) the current thread's bump allocation address and use it for very fast bump allocation during execution.
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