[Evolution-hackers] Handy GObject debugging trick
- From: Matthew Barnes <mbarnes redhat com>
- To: evolution-hackers gnome org
- Subject: [Evolution-hackers] Handy GObject debugging trick
- Date: Wed, 09 Mar 2011 18:20:35 -0500
Long ago and cubicle far, far away I wrote this little debugging
enhancement for GObject that collects statistics about instance
creation, destruction, etc. by class type and then prints a nicely
formatted report when piped through a tool named 'gobject-stats'.
My proposal for it got kinda hijacked and veered off into something even
fancier involving systemtap (it all kinda went over my head), so I don't
expect my patch to ever actually land in upstream GLib.
Nevertheless, I had occasion to wish for this feature again recently so
I dusted off my original patch and rebased it for GLib 2.28.
Here's the link (comment #46):
https://bugzilla.gnome.org/show_bug.cgi?id=354457#c45
Thought others might find it handy so I'm mentioning it.
How to use it:
1. Build GLib with debugging features enabled (--enable-debug).
Unstable GLib releases turn debugging features on by default,
stable releases turn debugging features off by default.
2. GOBJECT_DEBUG=types $MY_APPLICATION 2>&1 | gobject-stats
3. Do stuff in $MY_APPLICATION, then quit.
4. Read the stats to see how badly $MY_APPLICATION is leaking objects.
Here's a sample run I did on e-calendar-factory 2.91.92:
$ GOBJECT_DEBUG=types e-calendar-factory 2>&1 | gobject-stats
Instance Type Max Population # Created # Destroyed # Leaked
---------------------------------- -------------- --------- ----------- --------
GParamBoolean 35 35 0 35
EGdbusCalViewStub 30 30 0 30
GParamObject 27 27 0 27
GParamString 22 22 0 22
ECalBackendSExp 21 39 23 16
GParamEnum 16 16 0 16
ESourceGroup 16 16 4 12
GParamPointer 11 11 0 11
GParamUInt 11 11 0 11
GParamBoxed 10 10 0 10
ESource 16 16 10 6
EDataServerModule 6 6 0 6
GParamInt 6 6 0 6
GParamFlags 5 5 0 5
ESourceList 4 4 1 3
GParamULong 3 3 0 3
GParamGType 2 2 0 2
GSimpleAsyncResult 7 675 674 1
GDBusMessage 4 452 451 1
GSocket 2 13 12 1
GCancellable 2 8 7 1
GDBusAuth 1 2 1 1
GDBusConnection 1 2 1 1
GIOPConnection 2 2 1 1
GSocketInputStream 1 2 1 1
GSocketOutputStream 1 2 1 1
GUnixConnection 1 2 1 1
GUnixSocketAddress 1 2 1 1
ECalBackendCalDAVEventsFactory 1 1 0 1
ECalBackendCalDAVMemosFactory 1 1 0 1
ECalBackendCalDAVTodosFactory 1 1 0 1
ECalBackendContactsEventsFactory 1 1 0 1
ECalBackendFileEventsFactory 1 1 0 1
ECalBackendFileJournalFactory 1 1 0 1
ECalBackendFileTodosFactory 1 1 0 1
ECalBackendGroupwiseEventsFactory 1 1 0 1
ECalBackendGroupwiseJournalFactory 1 1 0 1
ECalBackendGroupwiseTodosFactory 1 1 0 1
ECalBackendHttpEventsFactory 1 1 0 1
ECalBackendHttpMemosFactory 1 1 0 1
ECalBackendHttpTodosFactory 1 1 0 1
ECalBackendWeatherEventsFactory 1 1 0 1
EGdbusBookFactoryProxy 1 1 0 1
GConfClient 1 1 0 1
GThreadedResolver 1 1 0 1
ECalComponent 196 263 263 0
GDataOutputStream 1 250 250 0
GMemoryOutputStream 1 248 248 0
GDataInputStream 1 206 206 0
GMemoryInputStream 1 204 204 0
GDBusMethodInvocation 3 150 150 0
EDataCalView 10 30 30 0
GInetSocketAddress 1 27 27 0
GInetAddress 4 19 19 0
GSocketClient 1 13 13 0
GTcpConnection 1 11 11 0
SoupAddressAddressEnumerator 1 11 11 0
SoupConnection 1 11 11 0
SoupSocket 1 11 11 0
EDataCal 6 6 6 0
EGdbusCalStub 6 6 6 0
EList 6 6 6 0
SoupMessage 1 6 6 0
EIntervalTree 5 5 5 0
GCredentials 2 4 4 0
SoupAddress 3 3 3 0
ECalBackendCalDAV 2 2 2 0
ECalBackendFileStore 2 2 2 0
EFileCache 2 2 2 0
EProxy 2 2 2 0
GDBusAuthMechanismExternal 1 2 2 0
GSocketAddressAddressEnumerator 1 2 2 0
GUnixCredentialsMessage 1 2 2 0
SoupAuthBasic 2 2 2 0
SoupAuthManagerNTLM 2 2 2 0
SoupSessionSync 2 2 2 0
EBook 1 1 1 0
ECalBackendContacts 1 1 1 0
ECalBackendFileEvents 1 1 1 0
ECalBackendFileJournal 1 1 1 0
ECalBackendFileTodos 1 1 1 0
EDataCalFactory 1 1 1 0
EGdbusCalFactoryStub 1 1 1 0
EOfflineListener 1 1 1 0
GIOPServer 1 1 1 0
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