X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=test%2Fjalview%2Fgui%2FFreeUpMemoryTest.java;fp=test%2Fjalview%2Fgui%2FFreeUpMemoryTest.java;h=3a5a9e4d61447ab31f35d85759b4fec0bfc440e7;hb=f3d57563c0364d1d44889156e264414fa32b5443;hp=24697c0763fca3f47998b607eef21beabc9920a9;hpb=d7f65ab5aed90618588864660d3e45bd18367a2b;p=jalview.git
diff --git a/test/jalview/gui/FreeUpMemoryTest.java b/test/jalview/gui/FreeUpMemoryTest.java
index 24697c0..3a5a9e4 100644
--- a/test/jalview/gui/FreeUpMemoryTest.java
+++ b/test/jalview/gui/FreeUpMemoryTest.java
@@ -1,17 +1,8 @@
package jalview.gui;
-import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;
-import jalview.analysis.AlignmentGenerator;
-import jalview.bin.Cache;
-import jalview.bin.Jalview;
-import jalview.datamodel.AlignmentI;
-import jalview.datamodel.SequenceGroup;
-import jalview.io.DataSourceType;
-import jalview.io.FileLoader;
-
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
@@ -20,20 +11,96 @@ import java.io.PrintStream;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
+import jalview.analysis.AlignmentGenerator;
+import jalview.bin.Cache;
+import jalview.bin.Jalview;
+import jalview.datamodel.AlignmentI;
+import jalview.datamodel.SequenceGroup;
+import jalview.io.DataSourceType;
+import jalview.io.FileLoader;
import junit.extensions.PA;
+/**
+ * Provides a simple test that memory is released when all windows are closed.
+ *
+ * - generates a reasonably large alignment and loads it
+ * - performs various operations on the alignment
+ * - closes all windows
+ * - requests garbage collection
+ * - asserts that the remaining memory footprint (heap usage) is 'not large'
+ *
+ *
+ * If the test fails, this means that reference(s) to large object(s) have
+ * failed to be garbage collected. In this case:
+ *
+ * - set a breakpoint just before the test assertion in
+ * {@code checkUsedMemory}
+ * - if the test fails intermittently, make this breakpoint conditional on
+ * {@code usedMemory > expectedMax}
+ * - run the test to this point (and check that it is about to fail i.e.
+ * {@code usedMemory > expectedMax})
+ * - use visualvm to obtain a heap
+ * dump from the suspended process (and kill the test or let it fail)
+ * - inspect the heap dump using visualvm for large objects and their
+ * referers
+ * - Tips:
+ *
+ * - Perform GC from the Monitor view in visualvm before requesting the heap
+ * dump - test failure might be simply a delay to GC
+ * - View 'Objects' and filter classes to {@code jalview}. Sort columns by
+ * Count, or Size, and look for anything suspicious. For example, if the object
+ * count for {@code Sequence} is non-zero (it shouldn't be), pick any instance,
+ * and follow the chain of {@code references} to find which class(es) still hold
+ * references to sequence objects
+ * - If this chain is impracticably long, re-run the test with a smaller
+ * alignment (set width=100, height=10 in {@code generateAlignment()}), to
+ * capture a heap which is qualitatively the same, but much smaller, so easier
+ * to analyse; note this requires an unconditional breakpoint
+ *
+ *
+ *
+ *
Fixing memory leaks
+ *
+ * Experience shows that often a reference is retained (directly or indirectly)
+ * by a Swing (or related) component (for example a {@code MouseListener} or
+ * {@code ActionListener}). There are two possible approaches to fixing:
+ *
+ * - Purist: ensure that all listeners and similar objects are removed when no
+ * longer needed. May be difficult, to achieve and to maintain as code
+ * changes.
+ * - Pragmatic: null references to potentially large objects from Jalview
+ * application classes when no longer needed, typically when a panel is closed.
+ * This ensures that even if the JVM keeps a reference to a panel or viewport,
+ * it does not retain a large heap footprint. This is the approach taken in, for
+ * example, {@code AlignmentPanel.closePanel()} and
+ * {@code AnnotationPanel.dispose()}.
+ * - Adjust code if necessary; for example an {@code ActionListener} should
+ * act on {@code av.getAlignment()} and not directly on {@code alignment}, as
+ * the latter pattern could leave persistent references to the alignment
+ *
+ * Add code to 'null unused large object references' until the test passes. For
+ * a final sanity check, capture the heap dump for a passing test, and satisfy
+ * yourself that only 'small' or 'harmless' {@code jalview} object instances
+ * (such as enums or singletons) are left in the heap.
+ */
public class FreeUpMemoryTest
{
private static final int ONE_MB = 1000 * 1000;
+ /*
+ * maximum retained heap usage (in MB) for a passing test
+ */
+ private static int MAX_RESIDUAL_HEAP = 45;
+
/**
* Configure (read-only) Jalview property settings for test
*/
@BeforeClass(alwaysRun = true)
public void setUp()
{
- Jalview.main(new String[] { "-nonews", "-props",
- "test/jalview/testProps.jvprops" });
+ Jalview.main(
+ new String[]
+ { "-nonews", "-props", "test/jalview/testProps.jvprops" });
String True = Boolean.TRUE.toString();
Cache.applicationProperties.setProperty("SHOW_ANNOTATIONS", True);
Cache.applicationProperties.setProperty("SHOW_QUALITY", True);
@@ -42,98 +109,79 @@ public class FreeUpMemoryTest
Cache.applicationProperties.setProperty("SHOW_IDENTITY", True);
}
- /**
- * A simple test that memory is released when all windows are closed.
- *
- * - generates a reasonably large alignment and loads it
- * - performs various operations on the alignment
- * - closes all windows
- * - requests garbage collection
- * - asserts that the remaining memory footprint (heap usage) is 'not large'
- *
- *
- * If the test fails, this suggests that a reference to some large object
- * (perhaps the alignment data, or some annotation / Tree / PCA data) has
- * failed to be garbage collected. If this is the case, the heap will need to
- * be inspected manually (suggest using jvisualvm) in order to track down
- * where large objects are still referenced. The code (for example
- * AlignmentViewport.dispose()) should then be updated to ensure references to
- * large objects are set to null when they are no longer required.
- *
- * @throws IOException
- */
@Test(groups = "Memory")
public void testFreeMemoryOnClose() throws IOException
{
File f = generateAlignment();
f.deleteOnExit();
- long expectedMin = 35L;
- long usedMemoryAtStart=getUsedMemory();
- if (usedMemoryAtStart>expectedMin)
- {
- System.err.println("used memory before test is "+usedMemoryAtStart+" > "+expectedMin+"MB .. adjusting minimum.");
- expectedMin = usedMemoryAtStart;
- }
doStuffInJalview(f);
Desktop.instance.closeAll_actionPerformed(null);
- checkUsedMemory(expectedMin);
+ checkUsedMemory(MAX_RESIDUAL_HEAP);
}
- private static long getUsedMemory()
+ /**
+ * Returns the current total used memory (available memory - free memory),
+ * rounded down to the nearest MB
+ *
+ * @return
+ */
+ private static int getUsedMemory()
{
- long availableMemory = Runtime.getRuntime().totalMemory() / ONE_MB;
- long freeMemory = Runtime.getRuntime().freeMemory() / ONE_MB;
+ long availableMemory = Runtime.getRuntime().totalMemory();
+ long freeMemory = Runtime.getRuntime().freeMemory();
long usedMemory = availableMemory - freeMemory;
- return usedMemory;
+
+ return (int) (usedMemory / ONE_MB);
}
+
/**
* Requests garbage collection and then checks whether remaining memory in use
* is less than the expected value (in Megabytes)
*
* @param expectedMax
*/
- protected void checkUsedMemory(long expectedMax)
+ protected void checkUsedMemory(int expectedMax)
{
/*
- * request garbage collection and wait for it to run;
+ * request garbage collection and wait for it to run (up to 3 times);
* NB there is no guarantee when, or whether, it will do so
- * wait time depends on JRE/processor, generous allowance here
*/
- System.gc();
- waitFor(1500);
-
- /*
- * a second gc() call should not be necessary - but it is!
- * the test passes with it, and fails without it
- */
- System.gc();
- waitFor(1500);
-
- /*
- * check used memory is 'reasonably low'
- */
- long usedMemory = getUsedMemory();
- /*
- * sanity check - fails if any frame was added after
- * closeAll_actionPerformed
- */
- assertEquals(Desktop.instance.getAllFrames().length, 0);
+ long usedMemory = 0L;
+ Long minUsedMemory = null;
+ int gcCount = 0;
+ while (gcCount < 3)
+ {
+ gcCount++;
+ System.gc();
+ waitFor(1500);
+ usedMemory = getUsedMemory();
+ if (minUsedMemory == null || usedMemory < minUsedMemory)
+ {
+ minUsedMemory = usedMemory;
+ }
+ if (usedMemory < expectedMax)
+ {
+ break;
+ }
+ }
/*
- * if this assertion fails
- * - set a breakpoint here
- * - run jvisualvm to inspect a heap dump of Jalview
- * - identify large objects in the heap and their referers
+ * if this assertion fails (reproducibly!)
+ * - set a breakpoint here, conditional on (usedMemory > expectedMax)
+ * - run VisualVM to inspect the heap usage, and run GC from VisualVM to check
+ * it is not simply delayed garbage collection causing the test failure
+ * - take a heap dump and identify large objects in the heap and their referers
* - fix code as necessary to null the references on close
*/
- System.out.println("Used memory after gc = " + usedMemory + "MB");
- assertTrue(usedMemory < expectedMax, String.format(
+ System.out.println("(Minimum) Used memory after " + gcCount
+ + " call(s) to gc() = " + minUsedMemory + "MB (should be <="
+ + expectedMax + ")");
+ assertTrue(usedMemory <= expectedMax, String.format(
"Used memory %d should be less than %d (Recommend running test manually to verify)",
- usedMemory,
- expectedMax));
+ usedMemory, expectedMax));
}
/**
@@ -193,7 +241,7 @@ public class FreeUpMemoryTest
* wait until Tree and PCA have been computed
*/
while (af.viewport.getCurrentTree() == null
- && dialog.getPcaPanel().isWorking())
+ || dialog.getPcaPanel().isWorking())
{
waitFor(10);
}
@@ -237,6 +285,7 @@ public class FreeUpMemoryTest
int width = 100000;
int height = 100;
ag.generate(width, height, 0, 10, 15);
+ ps.close();
return f;
}
}