Search code examples
javaout-of-memoryheap-dumpjhatmemoryanalyzer

Huge heap dump (11GB) - Jhat failed & Eclipse MAT needed help

We got a memory error in our EA and we used -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/path/to/some/dir to dump the heap at the time of OOM.

We had a heap memory of 12GB and perm gen of 256MB.

The heap dump is generated in the Linux box where we have our application running and its size is 11.5GB. We don't have privileges to download it to our local.

When we tried to analyze that 11GB heap dump using JHAT it thrown an OOM.

We tried the following commands from our Linux CLI.

jhat java_pid1491.hprof
jhat -J-Xmx16g -XX:-UseBiasedLocking java_pid1491.hprof
jhat -J-d64 -J-Xmx16g -J-XX:-UseBiasedLocking java_pid1491.hprof#1

For all the options its throwing an OOM exception after reading the dump for several minutes(>30 mins).

We googled it and found MAT as a powerful heap dump analyzer, but not a way to use it in LINUX.

Any suggestions would be of greater help. Thanks.

Modified:

Got MAT installed in Linux x86_64 machine but got following error when executed ./MemoryAnalyzer

(.:17319): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(.:17319): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
(.:17319): Gtk-CRITICAL **: gtk_settings_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
(.:17319): GLib-GObject-CRITICAL **: g_object_get: assertion `G_IS_OBJECT (object)' failed
(.:17319): Gtk-WARNING **: Screen for GtkWindow not set; you must always set
a screen for a GtkWindow before using the window
(.:17319): Gdk-CRITICAL **: gdk_pango_context_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
(.:17319): Pango-CRITICAL **: pango_context_set_font_description: assertion `context != NULL' failed
(.:17319): Pango-CRITICAL **: pango_context_set_base_dir: assertion `context != NULL' failed
(.:17319): Pango-CRITICAL **: pango_context_set_language: assertion `context != NULL' failed
(.:17319): Pango-CRITICAL **: pango_layout_new: assertion `context != NULL' failed
(.:17319): Pango-CRITICAL **: pango_layout_set_text: assertion `layout != NULL' failed
(.:17319): Pango-CRITICAL **: pango_layout_set_attributes: assertion `layout != NULL' failed
(.:17319): Pango-CRITICAL **: pango_layout_set_alignment: assertion `layout != NULL' failed
(.:17319): Pango-CRITICAL **: pango_layout_set_ellipsize: assertion `PANGO_IS_LAYOUT (layout)' failed
(.:17319): Pango-CRITICAL **: pango_layout_set_single_paragraph_mode: assertion `PANGO_IS_LAYOUT (layout)' failed
(.:17319): Pango-CRITICAL **: pango_layout_set_width: assertion `layout != NULL' failed
(.:17319): Pango-CRITICAL **: pango_layout_get_extents: assertion `layout != NULL' failed
(.:17319): Gtk-CRITICAL **: gtk_icon_theme_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
(.:17319): Gtk-CRITICAL **: gtk_settings_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
(.:17319): Gtk-CRITICAL **: gtk_icon_size_lookup_for_settings: assertion `GTK_IS_SETTINGS (settings)' failed
(.:17319): Gtk-WARNING **: Invalid icon size 6
(.:17319): Gtk-CRITICAL **: gtk_icon_theme_load_icon: assertion `GTK_IS_ICON_THEME (icon_theme)' failed
Segmentation fault

I tried ./ParseHeapDump.sh ../java_pid1491.hprof this and got following error,

Caused by: java.lang.NoClassDefFoundError: com/ibm/dtfj/image/CorruptDataException
        at org.eclipse.mat.dtfj.InitDTFJ.stop(InitDTFJ.java:70)
Solution

  • I was using MAT on Linux yesterday.... check out the proper version here