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debug: round 5 -- capture the time point on the callee side
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TEMPORARY.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
shadowdao
2026-09-21 10:57:47 -07:00
co-authored by Claude Opus 5
parent cb629a1050
commit cd8123a4ab
1 changed files with 45 additions and 40 deletions
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core/tests/test_session.cpp
+45 -40
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@@ -443,37 +443,53 @@ void testStallWatchdogTrace()
} }
} }
// TEMPORARY DEBUG -- remove before merge. Five shapes of the same loop, // TEMPORARY DEBUG -- remove before merge.
// each run twice. Nothing is printed until every trial is done. //
// mode 0 accumulate `now += 30000ms`, pass `now` (known-bad) // A non-inlined wrapper, so the time point can be read on the CALLEE side:
// mode 1 absolute `t0 + milliseconds(offset)` (known-good) // whatever `received_ns` holds is what actually crossed the call boundary,
// mode 2 accumulate, and sum the ns actually handed to poll // independent of what the caller's abstract-machine value was.
// mode 3 accumulate, pass a named copy of `now` #if defined(_MSC_VER)
// mode 4 accumulate by a non-const step variable #define ST_NOINLINE __declspec(noinline)
#else
#define ST_NOINLINE __attribute__((noinline))
#endif
ST_NOINLINE bool st_dbg_poll(StallWatchdog &w, std::chrono::steady_clock::time_point n,
long long *received_ns)
{
*received_ns = (long long)n.time_since_epoch().count();
return w.poll(n);
}
// Shapes, each run twice:
// mode 0 accumulate `now += 30000ms`, pass `now` (known-bad)
// mode 1 accumulate, pass a named copy of `now` (known-good)
// mode 2 accumulate, sum the ns the CALLER holds
// mode 3 accumulate, through st_dbg_poll (callee-side capture)
void testStallWatchdogQuiet() void testStallWatchdogQuiet()
{ {
struct Trial { struct Trial {
int mode; int mode;
int early[6]; int early[6];
int fire[6]; int fire[6];
long long early_arg_sum_ms;
long long fire_arg_sum_ms; long long fire_arg_sum_ms;
long long recv_rel_ms[6];
long long t0_ns;
long long next_rel_ns; long long next_rel_ns;
int attempts_after; int attempts_after;
}; };
const int kTrials = 10; const int kTrials = 8;
Trial trials[kTrials]; Trial trials[kTrials];
for (int t = 0; t < kTrials; ++t) { for (int t = 0; t < kTrials; ++t) {
const int mode = t % 5; const int mode = t % 4;
const auto t0 = std::chrono::steady_clock::now(); const auto t0 = std::chrono::steady_clock::now();
StallWatchdog w(std::chrono::milliseconds(2000), std::chrono::milliseconds(30000)); StallWatchdog w(std::chrono::milliseconds(2000), std::chrono::milliseconds(30000));
w.setExpectingFrames(true, t0); w.setExpectingFrames(true, t0);
int early[6] = {0}; int early[6] = {0};
int fire[6] = {0}; int fire[6] = {0};
long long esum = 0;
long long fsum = 0; long long fsum = 0;
long long recv[6] = {0, 0, 0, 0, 0, 0};
auto now = t0 + std::chrono::milliseconds(2000); auto now = t0 + std::chrono::milliseconds(2000);
(void)w.poll(now); (void)w.poll(now);
@@ -493,60 +509,49 @@ void testStallWatchdogQuiet()
fire[i] = w.poll(now) ? 1 : 0; fire[i] = w.poll(now) ? 1 : 0;
} }
} else if (mode == 1) { } else if (mode == 1) {
long long at = 32000;
for (int i = 0; i < 6; ++i) {
early[i] = w.poll(t0 + std::chrono::milliseconds(at + 29999)) ? 1 : 0;
at += 30000;
fire[i] = w.poll(t0 + std::chrono::milliseconds(at)) ? 1 : 0;
}
} else if (mode == 2) {
for (int i = 0; i < 6; ++i) {
const auto e = now + std::chrono::milliseconds(29999);
esum += std::chrono::duration_cast<std::chrono::milliseconds>(e - t0).count();
early[i] = w.poll(e) ? 1 : 0;
now += std::chrono::milliseconds(30000);
fsum += std::chrono::duration_cast<std::chrono::milliseconds>(now - t0).count();
fire[i] = w.poll(now) ? 1 : 0;
}
} else if (mode == 3) {
for (int i = 0; i < 6; ++i) { for (int i = 0; i < 6; ++i) {
early[i] = w.poll(now + std::chrono::milliseconds(29999)) ? 1 : 0; early[i] = w.poll(now + std::chrono::milliseconds(29999)) ? 1 : 0;
now += std::chrono::milliseconds(30000); now += std::chrono::milliseconds(30000);
const auto fire_arg = now; const auto fire_arg = now;
fire[i] = w.poll(fire_arg) ? 1 : 0; fire[i] = w.poll(fire_arg) ? 1 : 0;
} }
} else { } else if (mode == 2) {
std::chrono::milliseconds step(30000);
std::chrono::milliseconds probe(29999);
for (int i = 0; i < 6; ++i) { for (int i = 0; i < 6; ++i) {
early[i] = w.poll(now + probe) ? 1 : 0; early[i] = w.poll(now + std::chrono::milliseconds(29999)) ? 1 : 0;
now += step; now += std::chrono::milliseconds(30000);
fsum += std::chrono::duration_cast<std::chrono::milliseconds>(now - t0).count();
fire[i] = w.poll(now) ? 1 : 0; fire[i] = w.poll(now) ? 1 : 0;
} }
} else {
for (int i = 0; i < 6; ++i) {
long long junk = 0;
early[i] = st_dbg_poll(w, now + std::chrono::milliseconds(29999), &junk) ? 1 : 0;
now += std::chrono::milliseconds(30000);
fire[i] = st_dbg_poll(w, now, &recv[i]) ? 1 : 0;
}
} }
trials[t].mode = mode; trials[t].mode = mode;
for (int i = 0; i < 6; ++i) { for (int i = 0; i < 6; ++i) {
trials[t].early[i] = early[i]; trials[t].early[i] = early[i];
trials[t].fire[i] = fire[i]; trials[t].fire[i] = fire[i];
trials[t].recv_rel_ms[i] =
recv[i] ? (recv[i] - (long long)t0.time_since_epoch().count()) / 1000000LL : -1;
} }
trials[t].early_arg_sum_ms = esum;
trials[t].fire_arg_sum_ms = fsum; trials[t].fire_arg_sum_ms = fsum;
trials[t].t0_ns = (long long)t0.time_since_epoch().count();
trials[t].next_rel_ns = trials[t].next_rel_ns =
(long long)std::chrono::duration_cast<std::chrono::nanoseconds>(w.dbgNextAllowed() - t0).count(); (long long)std::chrono::duration_cast<std::chrono::nanoseconds>(w.dbgNextAllowed() - t0).count();
trials[t].attempts_after = w.attemptsThisStall(); trials[t].attempts_after = w.attemptsThisStall();
} }
// Expected sums for mode 2: early args 61999..211999 step 30000,
// fire args 62000..212000 step 30000.
std::fprintf(stderr, "WDQUIET expect_early_sum=%lld expect_fire_sum=%lld\n",
(long long)(61999 + 91999 + 121999 + 151999 + 181999 + 211999),
(long long)(62000 + 92000 + 122000 + 152000 + 182000 + 212000));
for (int t = 0; t < kTrials; ++t) { for (int t = 0; t < kTrials; ++t) {
std::fprintf(stderr, std::fprintf(stderr,
"WDQUIET trial=%2d mode=%d after=%d final_next_rel_ns=%lld esum=%lld fsum=%lld early=%d%d%d%d%d%d fire=%d%d%d%d%d%d\n", "WDQUIET trial=%d mode=%d after=%d next_rel_ns=%lld fsum=%lld(want 822000) recv_ms=%lld,%lld,%lld,%lld,%lld,%lld early=%d%d%d%d%d%d fire=%d%d%d%d%d%d\n",
t, trials[t].mode, trials[t].attempts_after, trials[t].next_rel_ns, t, trials[t].mode, trials[t].attempts_after, trials[t].next_rel_ns,
trials[t].early_arg_sum_ms, trials[t].fire_arg_sum_ms, trials[t].fire_arg_sum_ms,
trials[t].recv_rel_ms[0], trials[t].recv_rel_ms[1], trials[t].recv_rel_ms[2],
trials[t].recv_rel_ms[3], trials[t].recv_rel_ms[4], trials[t].recv_rel_ms[5],
trials[t].early[0], trials[t].early[1], trials[t].early[2], trials[t].early[0], trials[t].early[1], trials[t].early[2],
trials[t].early[3], trials[t].early[4], trials[t].early[5], trials[t].early[3], trials[t].early[4], trials[t].early[5],
trials[t].fire[0], trials[t].fire[1], trials[t].fire[2], trials[t].fire[0], trials[t].fire[1], trials[t].fire[2],