Load the data in memory before running the benchmarks

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/csv/trunk@1658653 13f79535-47bb-0310-9956-ffa450edef68

Author: ebourg

src/test/java/org/apache/commons/csv/CSVBenchmark.java

@@ -18,35 +18,57 @@
 package org.apache.commons.csv;
 
 import java.io.BufferedReader;
-import java.io.FileReader;
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringReader;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
+import java.util.zip.GZIPInputStream;
 
 import com.generationjava.io.CsvReader;
+import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.openjdk.jmh.annotations.Benchmark;
 import org.openjdk.jmh.annotations.BenchmarkMode;
 import org.openjdk.jmh.annotations.Fork;
 import org.openjdk.jmh.annotations.Measurement;
 import org.openjdk.jmh.annotations.Mode;
 import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
 import org.openjdk.jmh.annotations.Threads;
 import org.openjdk.jmh.annotations.Warmup;
 import org.openjdk.jmh.infra.Blackhole;
 import org.supercsv.io.CsvListReader;
 import org.supercsv.prefs.CsvPreference;
 
 @BenchmarkMode(Mode.AverageTime)
-@Fork(value = 1, jvmArgs = {"-server", "-Xms128M", "-Xmx128M"})
+@Fork(value = 1, jvmArgs = {"-server", "-Xms1024M", "-Xmx1024M"})
 @Threads(1)
 @Warmup(iterations = 5)
 @Measurement(iterations = 20)
 @OutputTimeUnit(TimeUnit.MILLISECONDS)
+@State(Scope.Benchmark)
 public class CSVBenchmark {
 
+    private String data;
+
+    /**
+     * Load the data in memory before running the benchmarks, this takes out IO from the results.
+     */
+    @Setup
+    public void init() throws IOException {
+        File file = new File("src/test/resources/perf/worldcitiespop.txt.gz");
+        InputStream in = new GZIPInputStream(new FileInputStream(file));
+        this.data = IOUtils.toString(in, "ISO-8859-1");
+        in.close();
+    }
+
     private BufferedReader getReader() throws IOException {
-        return new BufferedReader(new FileReader("worldcitiespop.txt"));
+        return new BufferedReader(new StringReader(data));
     }
 
     @Benchmark