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by torginus
19 hours ago
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Interesting and its noteworthy to observe that the new GC actually increases the rate of L3 misses slightly. For reference, L1 misses are quite fast, and often free since the CPU can cover up the empty slots with useful work, however L3 misses require a read from RAM which is an eternity in CPU cycles. My theory is that Go programs cover up the wait for L3 via SMT (which is still kinda common on server CPUs) and schedule work from another hardware thread. Such a technique might be less usable in less-threaded languages, or non-SMT CPUs and the new GC might end up being slower. |
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