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Measure attention capacity without observer overhead #189

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Merged
Maneek21 merged 1 commit into from
Jul 21, 2026
Merged

Measure attention capacity without observer overhead #189

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36 changes: 22 additions & 14 deletions scripts/certify-60-person.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -388,6 +388,15 @@ try {
const counters = connection.counters;
results.phases.websocket_connect = { connected: sockets.length, seconds: Math.round((performance.now() - socketStart) / 100) / 10 };

const attentionBaseline = await pool.query(`
SELECT count(*)::int projected
FROM attention_events
WHERE org_id = $1
AND event_type = 'source_event'
AND source_event_id LIKE 'notification:%'
`, [orgId]);
const projectedBeforeLoad = attentionBaseline.rows[0].projected;

process.stdout.write('[cert] Running simultaneous message + notification burst\n');
const burst = await postMessages({ users, tokens, spaceId, count: BURST_MESSAGES, prefix: 'burst' });
await sleep(1500);
Expand All @@ -413,27 +422,26 @@ try {
await waitFor(async () => {
const { rows } = await pool.query(`
SELECT count(*)::int projected
FROM attention_events ae
INNER JOIN notifications n ON ae.source_event_id = 'notification:' || n.id
WHERE ae.event_type = 'source_event'
AND n.org_id = $1
AND n.body LIKE $2
`, [orgId, `[CERT:${runId}:%`]);
return rows[0].projected === expectedNotificationDeliveries ? rows[0].projected : false;
FROM attention_events
WHERE org_id = $1
AND event_type = 'source_event'
AND source_event_id LIKE 'notification:%'
`, [orgId]);
const projectedDuringLoad = rows[0].projected - projectedBeforeLoad;
return projectedDuringLoad === expectedNotificationDeliveries ? projectedDuringLoad : false;
}, Math.max(5000, MAX_ATTENTION_PROJECTION_SECONDS * 1000), 250);
const attentionProjectionSeconds = Math.round((performance.now() - attentionProjectionStarted) / 100) / 10;
results.phases.notification_fanout_profile = parseCapacityProfiles(apiLog);
const attentionProjectionProof = await pool.query(`
SELECT count(*)::int projected
FROM attention_events ae
INNER JOIN notifications n ON ae.source_event_id = 'notification:' || n.id
WHERE ae.event_type = 'source_event'
AND n.org_id = $1
AND n.body LIKE $2
`, [orgId, `[CERT:${runId}:%`]);
FROM attention_events
WHERE org_id = $1
AND event_type = 'source_event'
AND source_event_id LIKE 'notification:%'
`, [orgId]);
results.phases.attention_projection = {
expected: expectedNotificationDeliveries,
actual: attentionProjectionProof.rows[0].projected,
actual: attentionProjectionProof.rows[0].projected - projectedBeforeLoad,
post_load_drain_seconds: attentionProjectionSeconds,
end_to_end_p95_ms: results.phases.notification_fanout_profile.attention_projection.end_to_end.p95_ms,
};
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