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feat: request_perf() worker-side timing hostcall; restore demo System Info

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Units run in the wasm sandbox, so my_pid/parent_pid/context.server->request_count
read as sandbox stubs — the demo System Info counters were broken, and there was
no authoritative server-side request timing available to unit code (client-side
measurement cannot see queue/dispatch latency).

Add a request_perf() unit API backed by a new uce_host_request_perf hostcall.
The native worker answers it live, returning a DValue:
  worker_pid, parent_pid, request_count,
  accept_us  = (time_start - time_init)*1e6   (entry -> dispatch wait),
  running_us = (now - time_start)*1e6         (since dispatch, live),
  total_us   = (now - time_init)*1e6          (since the request entered UCE),
  workspace_birth_us.
time_init is captured at request entry (handle_request, with a handle_complete
fallback); a RequestPerfSnapshot {pids, request_count, time_init, time_start} is
threaded from wasm_backend_serve through wasm_worker_serve onto the workspace,
and the hostcall computes the live deltas at call time. Wired like uce_host_units
(sized DValue hostcall): core_hostcalls.syms + sys.cpp/sys.h request_perf().

site/demo/index.uce System Info now uses request_perf() and shows the real worker
PID, an incrementing per-worker request count, and the timing counters.

Implemented via the pi agent (gpt-5.3-codex-spark); a review of the live numbers
caught accept_us mistakenly computed as (now - time_init) (== total_us), fixed to
the dispatch wait (time_start - time_init). Independently verified on the host:
System Info shows non-zero PIDs, incrementing count, accept_us ~50us << total_us
~2.4ms with accept+running==total; run_cli_tests --include-wasm-kill => 87 passed,
0 failed, 0 skipped.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
root
2026-06-15 08:18:04 +00:00
co-authored by Claude Opus 4.8
parent 83ab9e10f7
commit 4f84ac544d
7 changed files with 94 additions and 15 deletions
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src/linux_fastcgi.cpp
+11 -7
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@@ -459,13 +459,15 @@ int handle_cli_complete(FastCGIRequest& request)
}
int handle_request(FastCGIRequest& request) {
// This is always the first event to occur. It occurs when the
// server receives all parameters. There may be more data coming on the
// standard input stream.
if (request.params.count("REQUEST_URI"))
return 0; // OK, continue processing
else
return 1; // stop processing and return error code
// This is always the first event to occur. It occurs when the
// server receives all parameters. There may be more data coming on the
// standard input stream.
if(request.stats.time_init == 0)
request.stats.time_init = time_precise();
if(request.params.count("REQUEST_URI"))
return(0); // OK, continue processing
else
return(1); // stop processing and return error code
}
int handle_data(FastCGIRequest& request) {
@@ -478,6 +480,8 @@ int handle_complete(FastCGIRequest& request) {
Request* previous_context = set_active_request(request);
server_state.request_count += 1;
request.server = &server_state;
if(request.stats.time_init == 0)
request.stats.time_init = time_precise();
request.stats.time_start = time_precise();
//request.stats.mem_alloc = 0;
//request.stats.mem_high = 0;