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A burst now looks at the store once (pure_store_pin) instead of once per
request; another shard's commit ends before its answer is sent, so a
request made after that answer still reads it. With this alone one thread
serves 125k small keep-alive reads per second, as many as axum on three
cores, with a shorter p99.
--threads N runs a shard per thread: its own SO_REUSEPORT listener, epoll
set, runtime domain, app and store handle. Writer sessions of the tree
store now take turns inside a process with a mutex (the file lock belongs
to the process and does not keep threads apart), and revisions settle
concurrent edits of a key. A module with states runs on one thread. Three
shards serve 151k reads per second; they still commit one by one, so
durable writes and 1 MiB reads are better on one thread for now, which
stays the default. Note 075 records the numbers.
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pure-serve replaces the module mode of server.c, which goes back to what
it was. It keeps the document contract, the runtime core (a work slot per
connection, the payload budget, core-owned ingress, borrowed PUT replies)
and the group commits, and adds what server.c lacked: HTTP/1.1 persistent
connections with in-order pipelining, an edge-triggered epoll owner
thread, up to 1,024 connections allocated as they arrive and reused, one
writev per answer, and documents opened through a store handle.
On the Pi 5 with one thread it serves 106k small keep-alive reads per
second (axum on three cores: 126k) at the same p99, 1,741 1 MiB reads
(axum: 1,370), and 1,126 durable writes from 64 connections (crash-safe
axum: 372), in 7.3 MiB against axum's 17-20 MiB. Note 075 has the table.
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A C load generator, an axum service with the same document contract (in
memory, fdatasync, and crash-safe replacement), and a runner that pins the
servers and the load to separate CPUs. On the Pi 5, Pure uses about 40%
less memory, wins with a new connection per request and with eight durable
writers (3.2x the crash-safe axum), but loses 5x on keep-alive reads and
1.5x on 64 durable writers: no persistent connections, one thread, eight
connection slots and two fsyncs per commit. Note 075 records the numbers
and the targets.
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