diff --git a/lib/isc/task.c b/lib/isc/task.c
index 4f746d8c5c..685b787c05 100644
--- a/lib/isc/task.c
+++ b/lib/isc/task.c
@@ -951,27 +951,12 @@ push_readyq(isc__taskmgr_t *manager, isc__task_t *task, int c) {
 				  memory_order_acquire);
 }
 
-static uint64_t rdtsc();
-
-static uint64_t rdtsc() {
-	uint64_t msr;
-	asm volatile ( "rdtsc\n\t"
-               "shl $32, %%rdx\n\t"
-               "or %%rdx, %0"
-               : "=a" (msr)
-               :
-               : "rdx");
-        return msr;
-}
-
 static void
 dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 	isc__task_t *task;
 
 	REQUIRE(VALID_MANAGER(manager));
-	char fname[1024];
-	snprintf(fname, 1024, "TASKTRACE%06d.dat", threadid);
-	FILE * tracef = fopen(fname, "w");
+
 	/* Wait for everything to initialize */
 	LOCK(&manager->lock);
 	UNLOCK(&manager->lock);
@@ -1146,7 +1131,6 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 					XTRACE(task->name);
 					if (event->ev_action != NULL) {
 						UNLOCK(&task->lock);
-						fprintf(tracef, "%021llu %02d EXEC %p %p\n", rdtsc(), threadid, task, event->ev_action);
 						(event->ev_action)(
 							(isc_task_t *)task,
 							event);
@@ -1231,7 +1215,6 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 				}
 			} while (!done);
 			UNLOCK(&task->lock);
-			fprintf(tracef, "%021llu %02d DONE %p %d %d\n", rdtsc(), threadid, task, finished, requeue);
 
 			if (finished)
 				task_finished(task);
@@ -1305,7 +1288,6 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 		}
 	}
 	UNLOCK(&manager->queues[threadid].lock);
-	fclose(tracef);
 	/*
 	 * There might be other dispatchers waiting on empty tasks,
 	 * wake them up.