[injinj]

A wireshark capture shows that memcrsd is breaking up the response packets, not optimizing network, sending a lot more packets than memcached. With the 100 byte size, memcached is packing 10 PDUs per packet and memcrsd is doing 1.

Using memtier_benchmark --pipeline=1 with "memcached -t 1" and "memcrsd -r 1" shows almost identical results (141943 vs 136550) on my machine (keys 1 -> 100000). The network is where most of the CPU is spent in both memcached and memcrsd cases.

I'm slightly impressed with memcrsd/rust scaling, 32 runtimes with 16 memtier_benchark threads with pipeline=9 can produce 4 million ops/sec. They need to fix the networking parts.

I think most will use horizontal scaling anyway, and simply shard the memcached's and skip the threading concurrency. Multiple memcached's with client side sharding is hard to beat.