From cbcb83ede5d3a2646733ed5de9d556a2c8415b8b Mon Sep 17 00:00:00 2001
From: Dmitry Pisklov <dpisklov@gmail.com>
Date: Wed, 3 Jun 2020 20:58:54 +0100
Subject: [PATCH] Add stress test

---
 .../openhft/chronicle/map/perf/MapStress.java | 73 +++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/test/java/net/openhft/chronicle/map/perf/MapStress.java

diff --git a/src/test/java/net/openhft/chronicle/map/perf/MapStress.java b/src/test/java/net/openhft/chronicle/map/perf/MapStress.java
new file mode 100644
index 000000000..8a68a19e8
--- /dev/null
+++ b/src/test/java/net/openhft/chronicle/map/perf/MapStress.java
@@ -0,0 +1,73 @@
+package net.openhft.chronicle.map.perf;
+
+import net.openhft.chronicle.map.ChronicleMap;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Random;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.stream.IntStream;
+
+public class MapStress {
+    private static final File file = new File("./StressTested.cm3");
+    private static final int N_WRITE_THREADS = 100;
+    private static final int N_READ_THREADS = 20;
+    private ChronicleMap<String, String> map = ChronicleMap.of(String.class, String.class).averageKeySize(50).averageValueSize(500).entries(100_000).createOrRecoverPersistedTo(file);
+    private ChronicleMap<String, String> readerMap = ChronicleMap.of(String.class, String.class).averageKeySize(500).averageValueSize(500).entries(100_000).createOrRecoverPersistedTo(file);
+
+    private ExecutorService executor = Executors.newFixedThreadPool(N_WRITE_THREADS + N_READ_THREADS);
+    private ThreadLocal<Random> randomTL = ThreadLocal.withInitial(Random::new);
+
+    public MapStress() throws IOException {
+    }
+
+    public void stress() throws ExecutionException, InterruptedException {
+        Future<?>[] futures = new Future[N_WRITE_THREADS + N_READ_THREADS];
+        for (int i = 0; i < N_WRITE_THREADS; i++) {
+            String id = i + " -> ";
+            futures[i] = executor.submit(() -> {
+                final long started = System.currentTimeMillis();
+                long written = 0;
+                do {
+                    IntStream.range(0, 10).forEach(x -> {
+                        final int keyIdx = randomTL.get().nextInt(N_WRITE_THREADS);
+                        map.put("valuekdljashjgffkljakljsdffhh" + keyIdx, "aksjdfhljkhadfjklahfjkladshfjklahdsljkfch aljiocufoipreyuvoiurywcoriucy8oiuxrauoi;dajfhadsih" + System.nanoTime() + System.currentTimeMillis());
+                    });
+                    written += 10;
+
+                    if (written % 100_000 == 0)
+                        System.err.println(id + "Wrote " + written);
+                } while (System.currentTimeMillis() - started < 100_000);
+            });
+        }
+
+        for (int i = 0; i < N_READ_THREADS; i++) {
+            String id = i + " -> ";
+            futures[i + N_WRITE_THREADS] = executor.submit(() -> {
+                final long started = System.currentTimeMillis();
+                long got = 0;
+                do {
+                    final int keyIdx = randomTL.get().nextInt(N_WRITE_THREADS);
+                    if (null != readerMap.get("valuekdljashjgffkljakljsdffhh" + keyIdx)) {
+                        got++;
+                    }
+                } while (System.currentTimeMillis() - started < 100_000);
+                System.err.println(id + "Read total: " + got);
+            });
+        }
+
+        for (Future<?> f : futures) {
+            f.get();
+        }
+        executor.shutdown();
+    }
+
+    public static void main(String[] args) throws Exception {
+//        if (file.exists())
+//            file.delete();
+        new MapStress().stress();
+    }
+}