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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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site/demo/index.uce
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@@ -84,10 +84,16 @@ RENDER(Request& context)
<div class="system-info">
<h3>System Info</h3>
<pre><?
print("Worker PID: ", my_pid, "\n");
print("Parent PID: ", parent_pid, "\n");
DValue perf = request_perf();
print("Worker PID: ", (u64)perf["worker_pid"].to_u64(), "\n");
print("Parent PID: ", (u64)perf["parent_pid"].to_u64(), "\n");
print("Request #: ", (u64)perf["request_count"].to_u64(), "\n");
print("Accept us: ", (f64)perf["accept_us"].to_f64(), "\n");
print("Running us: ", (f64)perf["running_us"].to_f64(), "\n");
print("Total us: ", (f64)perf["total_us"].to_f64(), "\n");
if(perf["workspace_birth_us"].type != 'S')
print("Workspace birth us: ", (u64)perf["workspace_birth_us"].to_u64(), "\n");
print("Output buffer size: ", context.ob->str().length(), "\n");
print("Request #", context.server->request_count, "\n");
?></pre>
</div>
<? } ?>