perf: cache runtime usage telemetry

src/main/services/team/TeamProvisioningService.ts

@@ -772,7 +772,7 @@ interface RuntimeProcessLoadStats extends RuntimeProcessUsageStats {
 
 type RuntimeTelemetryProcessSource = 'native' | 'wsl' | 'windows-host';
 
-interface RuntimeTelemetryProcessTableRow extends RuntimeProcessTableRow {
+interface RuntimeTelemetryProcessTableRow extends RuntimeProcessTableRow, RuntimeProcessUsageStats {
   runtimeTelemetrySource?: RuntimeTelemetryProcessSource;
 }
 
@@ -3294,6 +3294,7 @@ export class TeamProvisioningService {
   private static readonly MAX_RUNTIME_USAGE_PIDS_PER_SNAPSHOT = 512;
   private static readonly RUNTIME_PROCESS_TABLE_TIMEOUT_MS = 1_500;
   private static readonly RUNTIME_WINDOWS_PROCESS_TABLE_TIMEOUT_MS = 1_500;
+  private static readonly RUNTIME_PROCESS_USAGE_CACHE_TTL_MS = 30_000;
   private static readonly RUNTIME_PIDUSAGE_BATCH_TIMEOUT_MS = 2_000;
   private static readonly RUNTIME_PIDUSAGE_SINGLE_TIMEOUT_MS = 750;
   private static readonly RUNTIME_PIDUSAGE_FALLBACK_CONCURRENCY = 16;
@@ -3396,6 +3397,13 @@ export class TeamProvisioningService {
       includesWindowsHostRows: boolean;
     }
   >();
+  private readonly runtimeProcessUsageStatsCacheByPid = new Map<
+    number,
+    {
+      expiresAtMs: number;
+      stats: RuntimeProcessUsageStats | null;
+    }
+  >();
   private readonly agentRuntimeSnapshotInFlightByTeam = new Map<
     string,
     {
@@ -14095,7 +14103,14 @@ export class TeamProvisioningService {
       const runtimeUsagePids = [
         ...new Set([...runtimeUsageTreesByRootPid.values()].flatMap((tree) => tree.pids)),
       ];
-      usageStatsByPid = await this.readProcessUsageStatsByPid(runtimeUsagePids);
+      usageStatsByPid = this.buildProcessUsageStatsFromRows(runtimeProcessRows, runtimeUsagePids);
+      const pidsMissingUsageStats = runtimeUsagePids.filter((pid) => !usageStatsByPid.has(pid));
+      if (pidsMissingUsageStats.length > 0) {
+        const sampledUsageStats = await this.readProcessUsageStatsByPid(pidsMissingUsageStats);
+        for (const [pid, stats] of sampledUsageStats) {
+          usageStatsByPid.set(pid, stats);
+        }
+      }
     } catch (error) {
       logger.debug(
         `[${teamName}] Runtime telemetry sampling failed; continuing without resource metrics: ${
@@ -25663,10 +25678,12 @@ export class TeamProvisioningService {
           candidate.runtimeTelemetrySource === 'windows-host'
             ? candidate.runtimeTelemetrySource
             : undefined);
+        const usageStats = this.normalizeRuntimeProcessUsageStats(candidate);
         normalizedRows.push({
           pid: Math.floor(pid),
           ppid: Math.floor(ppid),
           command,
+          ...(usageStats ?? {}),
           ...(runtimeTelemetrySource ? { runtimeTelemetrySource } : {}),
         });
       }
@@ -26038,6 +26055,28 @@ export class TeamProvisioningService {
     }
   }
 
+  private buildProcessUsageStatsFromRows(
+    processRows: readonly RuntimeTelemetryProcessTableRow[] | null,
+    pids: readonly number[]
+  ): Map<number, RuntimeProcessUsageStats> {
+    const usageStatsByPid = new Map<number, RuntimeProcessUsageStats>();
+    const requestedPids = new Set(pids.filter((pid) => Number.isFinite(pid) && pid > 0));
+    if (!Array.isArray(processRows) || requestedPids.size === 0) {
+      return usageStatsByPid;
+    }
+
+    for (const row of processRows) {
+      if (!requestedPids.has(row.pid)) {
+        continue;
+      }
+      const usageStats = this.normalizeRuntimeProcessUsageStats(row);
+      if (usageStats) {
+        usageStatsByPid.set(row.pid, usageStats);
+      }
+    }
+    return usageStatsByPid;
+  }
+
   private async readProcessUsageStatsByPid(
     pids: readonly number[]
   ): Promise<Map<number, RuntimeProcessUsageStats>> {
@@ -26048,20 +26087,57 @@ export class TeamProvisioningService {
     }
 
     const usageStatsByPid = new Map<number, RuntimeProcessUsageStats>();
+    const pidsToRead: number[] = [];
+    const now = Date.now();
+    for (const pid of uniquePids) {
+      const cached = this.runtimeProcessUsageStatsCacheByPid.get(pid);
+      if (cached && cached.expiresAtMs > now) {
+        if (cached.stats) {
+          usageStatsByPid.set(pid, { ...cached.stats });
+        }
+        continue;
+      }
+      pidsToRead.push(pid);
+    }
+    if (pidsToRead.length === 0) {
+      return usageStatsByPid;
+    }
+
+    const rememberUsageStats = (
+      pid: number,
+      stats: RuntimeProcessUsageStats | null | undefined
+    ): void => {
+      const normalized = stats ? { ...stats } : null;
+      this.runtimeProcessUsageStatsCacheByPid.set(pid, {
+        expiresAtMs: Date.now() + TeamProvisioningService.RUNTIME_PROCESS_USAGE_CACHE_TTL_MS,
+        stats: normalized,
+      });
+      if (normalized) {
+        usageStatsByPid.set(pid, { ...normalized });
+      }
+    };
+
     const options = RUNTIME_PIDUSAGE_OPTIONS;
     try {
       const statsByPid = await this.withRuntimeTelemetryTimeout(
-        pidusage(uniquePids, options),
+        pidusage(pidsToRead, options),
         TeamProvisioningService.RUNTIME_PIDUSAGE_BATCH_TIMEOUT_MS,
         'pidusage batch runtime telemetry'
       );
+      const observedPids = new Set<number>();
       for (const [rawPid, stat] of Object.entries(
         statsByPid && typeof statsByPid === 'object' ? statsByPid : {}
       )) {
         const pid = Number.parseInt(rawPid, 10);
         const usageStats = this.normalizeRuntimeProcessUsageStats(stat);
-        if (Number.isFinite(pid) && pid > 0 && usageStats) {
+        if (Number.isFinite(pid) && pid > 0) {
-          usageStatsByPid.set(pid, usageStats);
+          observedPids.add(pid);
+          rememberUsageStats(pid, usageStats);
+        }
+      }
+      for (const pid of pidsToRead) {
+        if (!observedPids.has(pid)) {
+          rememberUsageStats(pid, null);
         }
       }
       return usageStatsByPid;
@@ -26079,10 +26155,10 @@ export class TeamProvisioningService {
 
     for (
       let offset = 0;
-      offset < uniquePids.length;
+      offset < pidsToRead.length;
       offset += TeamProvisioningService.RUNTIME_PIDUSAGE_FALLBACK_CONCURRENCY
     ) {
-      const chunk = uniquePids.slice(
+      const chunk = pidsToRead.slice(
         offset,
         offset + TeamProvisioningService.RUNTIME_PIDUSAGE_FALLBACK_CONCURRENCY
       );
@@ -26095,13 +26171,12 @@ export class TeamProvisioningService {
               `pidusage runtime telemetry pid=${pid}`
             );
             const usageStats = this.normalizeRuntimeProcessUsageStats(stat);
-            if (usageStats) {
+            rememberUsageStats(pid, usageStats);
-              usageStatsByPid.set(pid, usageStats);
-            }
           } catch (error) {
             if (error instanceof RuntimeTelemetryTimeoutError) {
               logger.debug(error.message);
             }
+            rememberUsageStats(pid, null);
             // Process likely exited between discovery and sampling.
           }
         })

test/main/services/team/TeamProvisioningService.test.ts

@@ -4740,6 +4740,22 @@ describe('TeamProvisioningService', () => {
       expect(stats.get(333)).toEqual({ rssBytes: 123_000_000, cpuPercent: 7 });
     });
 
+    it('caches runtime process usage stats for repeated reads', async () => {
+      const svc = new TeamProvisioningService();
+      const usageByPid: Record<string, ReturnType<typeof createPidusageStat>> = {
+        '111': createPidusageStat(111, 123_000_000, 7),
+      };
+      vi.mocked(pidusage).mockResolvedValueOnce(usageByPid);
+
+      const first = await (svc as any).readProcessUsageStatsByPid([111]);
+      const second = await (svc as any).readProcessUsageStatsByPid([111]);
+
+      expect(pidusage).toHaveBeenCalledTimes(1);
+      expect(pidusage).toHaveBeenCalledWith([111], EXPECTED_RUNTIME_PIDUSAGE_OPTIONS);
+      expect(first.get(111)).toEqual({ rssBytes: 123_000_000, cpuPercent: 7 });
+      expect(second.get(111)).toEqual({ rssBytes: 123_000_000, cpuPercent: 7 });
+    });
+
     it('falls back to direct agent process lookup when tmux pane pid lookup is unavailable', async () => {
       const svc = new TeamProvisioningService();
       (svc as any).configReader = {