bulkstat: preheat caches to simplify measurements.

example/benchmark.sh

@@ -39,12 +39,6 @@ ${ZIPFS} ${MP} ${ZIPFILE} >& zipfs.log &
 # Wait for zipfs to unpack and serve the file.
 sleep ${DELAY}
 
-# Warm caches.
-${BULKSTAT} -runs 1 /tmp/zipfiles.txt
-
-# Wait for dentry cache to expire.
-sleep 2
-
 # Performance number without 6prof running
 echo -e "\n\n"
 ${BULKSTAT} -runs 5 /tmp/zipfiles.txt
@@ -66,12 +60,6 @@ ${ZIPFS} -latencies ${MP} ${ZIPFILE} >& zipfs.log &
 
 sleep ${DELAY}
 
-# Warm caches.
-${BULKSTAT} -runs 1 /tmp/zipfiles.txt
-
-# Expire dentry cache.
-sleep 2
-
 # Measurements.
 ${BULKSTAT} -runs 5 /tmp/zipfiles.txt
 

example/bulkstat/bulkstat.go

@@ -37,9 +37,16 @@ func main() {
 	}
 
 	tot := 0.0
-	for j := *runs; j > 0; j-- {
-		tot += BulkStat(*threads, files)
-		if j > 1 {
+	totalRuns := *runs + 1
+
+	for j := 0 ; j < totalRuns; j++ {
+		result := BulkStat(*threads, files)
+		if j > 0 {
+			tot += result
+		} else {
+			fmt.Println("Ignoring first run to preheat caches.")
+		}
+		if j < totalRuns-1 {
 			fmt.Printf("Sleeping %.2f seconds\n", *sleepTime)
 			time.Sleep(int64(*sleepTime * 1e9))
 		}