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Yes, I think io_uring is slowly making its way onto Java ecosystem. Example: https://github.com/netty/netty-incubator-transport-io_uring
I guess it will go into the JVM too.
I wanted to see some benchmark numbers but the first hit on google returns a unresolved 150+ message github issue about how io_ring might not be better than epoll: https://github.com/axboe/liburing/issues/189
I didn't read the entire thread, but are there still implementation kinks that are being worked out or is the api ready to use now?
My side project has been to rewrite https://github.com/erpc-io/eRPC which does RPCs over UDP with some congestion control supposedly quite fast. Paper: https://www.usenix.org/system/files/nsdi19-kalia.pdf. I never got the code to work in AWS; I believe the author focused on Mellanox NICS but that's not really commodity H/W, which is where my interests lay.
So I dug into it .. and well I'll have my own library soon. I should be able to send UDP w/o congestion control sometime this week.
eRPC uses DPDK (100% user space NIC TX/RX control) plus the author's own other ideas to get performance. Since I'm getting into NICs + DPDK (in a serious way i.e this much more involved than vanilla sys/socket.h I/O) way, way late in the game, I hope and believe DPDK is, in the medium term, the better way to go than to turn to kernel improvements in for I/O.
Like others, getting the kernel out of the way, with pinned threads seems cleaner if one can develop from scratch.
This library will be a part of something bigger, however, a key architecture point for many people is: I got a RPC/packet/message. Now should I:
* process it in-place e.g. on the thread that was doing RX?
* delegate it to another core?
* if I delegate .. to whom?
* If I delegate how do I get a response back?
In DPDK I believe these are easier to decide and well-manage in code.