[Miniflare 3] Re-enable concurrent dispatchFetch()s and batch proxy heap frees
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In order to fix tests when adding the magic proxy, we restricted `dispatchFetch()` to one concurrent TCP connection. Unfortunately, this prevented long-lived `dispatchFetch()` requests. When proxies are garbage collected, we send a network request to `workerd` to free the corresponding entry in the `ProxyServer` heap. Garbage collection often happens in phases though, freeing lots of objects at once. This caused many concurrent requests to `workerd` (~60 in some tests), leading to many TCP connections being created. This change re-enables using multiple TCP connections, and attempts to address the root cause of the issues we were seeing, by batching frees before sending the network request.
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dispatchFetch()s and batch proxy heap frees
RamIdeas
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Oct 10, 2023
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In order to fix tests when adding the magic proxy, we restricted
dispatchFetch()to one concurrent TCP connection. Unfortunately, this prevented long-liveddispatchFetch()requests.When proxies are garbage collected, we send a network request to
workerdto free the corresponding entry in theProxyServerheap. Garbage collection often happens in phases though, freeing lots of objects at once. This caused many concurrent requests toworkerd(~60 in some tests), leading to many TCP connections being created.This change re-enables using multiple TCP connections, and attempts to address the root cause of the issues we were seeing, by batching frees before sending the network request.