update detection of OpenJdk8 log files

Author: chewiebug

src/main/java/com/tagtraum/perf/gcviewer/imp/DataReaderFactory.java

@@ -161,18 +161,17 @@ else if (s.contains(" (young)") || s.contains("G1Ergonomics") || s.contains(" (m
             // G1 logger usually starts with "<timestamp>: [GC pause (young)...]"
             // but can start with  <timestamp>: [G1Ergonomics (Heap Sizing) expand the heap...
             // with certain logging flaggs.
-            if (getLogger().isLoggable(Level.INFO)) getLogger().info("File format: Sun 1.6.x .. 1.8.x G1 collector");
+            if (getLogger().isLoggable(Level.INFO)) getLogger().info("File format: Sun / Oracle / OpenJdk 1.6.x .. 1.8.x G1 collector");
             return new DataReaderSun1_6_0G1(gcResource, in, GcLogType.SUN1_6G1);
         }
-        else if (s.contains("-XX:+UseSerialGC") || s.contains("-XX:+UseParallelGC") || s.contains("-XX:+UseConcMarkSweepGC")
-                || s.contains("-XX:+UseShenandoahGC")) {
-
-            if (getLogger().isLoggable(Level.INFO)) getLogger().info("File format: Sun 1.6.x .. 1.8.x");
+        else if (s.contains("CommandLine flags:")) {
+            // all OpenJdk logs with non G1 gc collector
+            if (getLogger().isLoggable(Level.INFO)) getLogger().info("File format: Oracle / OpenJdk 1.8.x");
             return new DataReaderSun1_6_0(gcResource, in, GcLogType.SUN1_6);
         }
         else if (s.contains("[Times:") || s.contains("[Pause Init Mark") /* Shenandoah, -XX:-PrintGCDetails */) {
             // all 1.6 lines end with a block like this "[Times: user=1.13 sys=0.08, real=0.95 secs]"
-            if (getLogger().isLoggable(Level.INFO)) getLogger().info("File format: Sun 1.6.x");
+            if (getLogger().isLoggable(Level.INFO)) getLogger().info("File format: Sun 1.6.x .. 1.8.x");
             return new DataReaderSun1_6_0(gcResource, in, GcLogType.SUN1_6);
         }
         else if (s.contains("CMS-initial-mark") || s.contains("PSYoungGen")) {

src/test/java/com/tagtraum/perf/gcviewer/imp/TestDataReaderFactory.java

@@ -313,6 +313,26 @@ public void testSun1_4_0() throws Exception {
         assertDataReader(DataReaderSun1_6_0.class, dr.getClass());
     }
 
+    @Test
+    public void testOpenJdk8DockerMemory512mCpus0_5() throws IOException {
+        // Using an OpenJdk8 docker image and letting the JVM decide on the algorithm (--memory=512m --cpus="0.5")
+        DataReaderFactory factory = new DataReaderFactory();
+        DataReader dr = factory.getDataReader(new GcResourceFile("byteArray"), new ByteArrayInputStream(("OpenJDK 64-Bit Server VM (25.275-b01) for linux-amd64 JRE (1.8.0_275-b01), built on Nov  6 2020 14:10:46 by \"openjdk\" with gcc 4.4.7 20120313 (Red Hat 4.4.7-23)\n" +
+                "Memory: 4k page, physical 524288k(521828k free), swap 1048572k(1048572k free)\n" +
+                "CommandLine flags: -XX:InitialHeapSize=8388608 -XX:MaxHeapSize=134217728 -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+UseCompressedClassPointers -XX:+UseCompressedOops\n").getBytes()));
+        assertDataReader(DataReaderSun1_6_0.class, dr.getClass());
+    }
+
+    @Test
+    public void testOpenJdk8DockerMemory2gCpus2() throws IOException {
+        // Using an OpenJdk8 docker image and letting the JVM decide on the algorithm (--memory=2g --cpus="2")
+        DataReaderFactory factory = new DataReaderFactory();
+        DataReader dr = factory.getDataReader(new GcResourceFile("byteArray"), new ByteArrayInputStream(("OpenJDK 64-Bit Server VM (25.275-b01) for linux-amd64 JRE (1.8.0_275-b01), built on Nov  6 2020 14:10:46 by \"openjdk\" with gcc 4.4.7 20120313 (Red Hat 4.4.7-23)\n" +
+                "Memory: 4k page, physical 2097152k(2094956k free), swap 1048572k(1048572k free)\n" +
+                "CommandLine flags: -XX:InitialHeapSize=33554432 -XX:MaxHeapSize=536870912 -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseParallelGC\n").getBytes()));
+        assertDataReader(DataReaderSun1_6_0.class, dr.getClass());
+    }
+
     @Test
     public void testOracleG1J8() throws Exception {
         DataReaderFactory factory = new DataReaderFactory();