refactor(ngcc): add debug logging for the duration of different operations (#32427)

This gives an overview of how much time is spent in each operation/phase
and makes it easy to do rough comparisons of how different
configurations or changes affect performance.

PR Close #32427

packages/compiler-cli/ngcc/src/execution/cluster/master.ts

@@ -26,6 +26,7 @@ import {Deferred, sendMessageToWorker} from './utils';
  */
 export class ClusterMaster {
   private finishedDeferred = new Deferred<void>();
+  private processingStartTime: number = -1;
   private taskAssignments = new Map<number, Task|null>();
   private taskQueue: TaskQueue;
 
@@ -67,6 +68,9 @@ export class ClusterMaster {
 
     // First, check whether all tasks have been completed.
     if (this.taskQueue.allTasksCompleted) {
+      const duration = Math.round((Date.now() - this.processingStartTime) / 1000);
+      this.logger.debug(`Processed tasks in ${duration}s.`);
+
       return this.finishedDeferred.resolve();
     }
 
@@ -176,6 +180,11 @@ export class ClusterMaster {
       throw new Error(`Invariant violated: Worker #${workerId} came online more than once.`);
     }
 
+    if (this.processingStartTime === -1) {
+      this.logger.debug('Processing tasks...');
+      this.processingStartTime = Date.now();
+    }
+
     this.taskAssignments.set(workerId, null);
     this.maybeDistributeWork();
   }

packages/compiler-cli/ngcc/src/execution/single_process_executor.ts

@@ -27,11 +27,17 @@ export class SingleProcessExecutor implements Executor {
         createCompileFn((task, outcome) => onTaskCompleted(this.pkgJsonUpdater, task, outcome));
 
     // Process all tasks.
+    this.logger.debug('Processing tasks...');
+    const startTime = Date.now();
+
     while (!taskQueue.allTasksCompleted) {
       const task = taskQueue.getNextTask() !;
       compile(task);
       taskQueue.markTaskCompleted(task);
     }
+
+    const duration = Math.round((Date.now() - startTime) / 1000);
+    this.logger.debug(`Processed tasks in ${duration}s.`);
   }
 }