From 302ced1476d2fb7dcc820cbc6393d4109147ae01 Mon Sep 17 00:00:00 2001
From: akwizgran <michael@briarproject.org>
Date: Thu, 7 Dec 2017 17:50:10 +0000
Subject: [PATCH] Measure the first run to see the extent of warm-up.
---
.../bramble/db/JdbcDatabasePerformanceTest.java | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/bramble-core/src/test/java/org/briarproject/bramble/db/JdbcDatabasePerformanceTest.java b/bramble-core/src/test/java/org/briarproject/bramble/db/JdbcDatabasePerformanceTest.java
index e28e228816..edfe4b2f03 100644
--- a/bramble-core/src/test/java/org/briarproject/bramble/db/JdbcDatabasePerformanceTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/db/JdbcDatabasePerformanceTest.java
@@ -243,16 +243,23 @@ public abstract class JdbcDatabasePerformanceTest extends BrambleTestCase {
populateDatabase(db);
db.close();
db = openDatabase();
- List<Long> durations = new ArrayList<>(MEASUREMENT_ITERATIONS);
+ // Measure the first run
+ long start = System.nanoTime();
+ task.run(db);
+ long firstDuration = System.nanoTime() - start;
+ // Warm up the JIT and DB indices
for (int i = 0; i < WARMUP_ITERATIONS; i++) task.run(db);
+ // Measure the next runs
+ List<Long> durations = new ArrayList<>(MEASUREMENT_ITERATIONS);
for (int i = 0; i < MEASUREMENT_ITERATIONS; i++) {
- long start = System.nanoTime();
+ start = System.nanoTime();
task.run(db);
durations.add(System.nanoTime() - start);
}
db.close();
- String result = String.format("%s\t%,d\t%,d\t%,d", name,
- (long) getMean(durations), (long) getMedian(durations),
+ String result = String.format("%s\t%,d\t%,d\t%,d\t%,d", name,
+ firstDuration, (long) getMean(durations),
+ (long) getMedian(durations),
(long) getStandardDeviation(durations));
System.out.println(result);
PrintWriter out =
--
GitLab