Re^8: Detecting memory leaks.

Hi Anon,

Ok, I ran it and I get a huge list of stuff like this:

new 0x492bdd8 : 
new 0x36031a0 : 
new 0x2930a58 : 
new 0x2909af8 : 
old (1):
 0 
old (1):
 0 
old (1):
[download]

I guess they are new octal addresses. The counts seem very high, this is what I get:


        my $mu = Memory::Usage->new();
        $mu->record('before add appointment');
        my $count1 =  Devel::Leak::NoteSV(my $handle);
        __new_appointment($self1, $event1);
        my $count2 =  Devel::Leak::CheckSV($handle );
        print $count1, "\n";
        print $count2, "\n";
        print $count2-$count1, "\n";
        $mu->record('after add appointment');
        $mu->dump();
    __END__    
595269
596072
803

  time    vsz (  diff)    rss (  diff) shared (  diff)   code (  diff)
+   data (  diff)
     0  772200 ( 772200)  195796 ( 195796)  43708 ( 43708)      8 (   
+  8)  369168 ( 369168) before add appointment
    33  794160 ( 21960)  217104 ( 21308)  43972 (   264)      8 (     
+0)  390508 ( 21340) after add appointment
[download]

How can I track down these addresses?

It's a bit above my pay grade!

Regards

Steve.

Comment on Re^8: Detecting memory leaks. Select or Download Code

Replies are listed 'Best First'.
Re^9: Detecting memory leaks. by Anonymous Monk on May 07, 2015 at 09:50 UTC
Well, you keep sticking notesv/checksv around chunks of code until you narrow it down, then do a code review looking for references Or you could try Devel::Cycle which will at least tell you what kind of cycles it found	[reply]
Re^10: Detecting memory leaks. by Steve_BZ (Chaplain) on May 07, 2015 at 11:16 UTC
Hi Anon, So using your narrow review method, the following (ie one function using a hash object) `my $count1 = Devel::Leak::NoteSV(my $handle); $booking_dlg->{booking_main} = Wx::Panel->new($booking_dlg +, wxID_ANY, wxDefaultPosition,[$gl_cfg->{monitor_resolution_x}, $gl_c +fg->{monitor_resolution_y}], wxNO_BORDER, "" ); my $count2 = Devel::Leak::CheckSV($handle ); print "Count1 = '",$count1,"'\n"; print "Count2 = '",$count2,"'\n"; print "Diff = '",$count2-$count1,"'\n";` [download] Gives me: `new 0x9d741e8 : new 0x9d56f70 : new 0x9d44858 : new 0x9d38270 : new 0x9d382d0 : old (1): 0 Count1 = '594970' Count2 = '594974' Diff = '4'` [download] Maybe I'm using the wrong mental model, but I don't really see how this could be, unless there are new objects being created by Wx::Panel, which are then referred to by references in $booking_dlg->{booking_main} and therefore not dropping out of scope. What do you think? Regards	[reply] [d/l] [select]
Re^11: Detecting memory leaks. by wrog (Friar) on May 07, 2015 at 15:51 UTC
You are passing in `$booking_dlg` to `Wx::Panel::new`, which is presumably creating a `Wx::Panel` object, which recursively refers to at least 3 other objects. If any of these other objects saves the reference to `$booking_dlg`, then you have a circularity of the form: `$booking_dlg->{booking_main} == Wx::Panel object, (Wx::Panel object)->{foo} == other object (other object)->{bar} = $booking_dlg` [download] which will preserve the `Wx::Panel` object, the other object, and the `$booking_dlg` object forever unless `->{booking_main}` gets reassigned sometime later. (and if `$booking_dlg` is simply being tossed later on, there's your leak right there) (Update: Well, okay, it could also be (`Wx::Panel` object)`->{foo} = $booking_dlg` directly and the other 3 objects are just being dragged along for the ride. It only takes one such reference to ruin your day...)	[reply] [d/l] [select]
Re^11: Detecting memory leaks. by Anonymous Monk on May 08, 2015 at 03:00 UTC
Umm I think something went wrong , things seem different from what I remember and from what it apparently is, I'm unsure of stuff now Consider this program Read more... (9 kB) "new f new p" is not supposed to leak 400 scalars "new f child p" is not supposed to leak 400 scalars because the reference is supposed to be a weak reference "new f child p destroy" is not supposed to leak 200 scalars, circular reference or no circular reference, Destroy is supposed to clean them all up ... So maybe this is just taskmanager lying to me, or Devel::Cycle lying, or I'm really mis remember how this used to work or how its supposed to work, but I'm pretty sure this is a bug that needs to be reported to rt://Wx :) you should report it Heck, consider these oneliners Read more... (1105 Bytes) My winxp taskmanager tells me memory keeps increasing with these programs ... well its pretty much not supposed to Dang	[reply] [d/l] [select]
Re^12: Detecting memory leaks. by Steve_BZ (Chaplain) on May 11, 2015 at 16:09 UTC
Re^13: Detecting memory leaks. ( Wx::wxTheApp()->ProcessIdle; ) by Anonymous Monk on May 13, 2015 at 07:54 UTC
Some notes below your chosen depth have not been shown here
Re^13: Detecting memory leaks. by Anonymous Monk on May 13, 2015 at 07:19 UTC
Re^12: Detecting memory leaks. by Steve_BZ (Chaplain) on May 09, 2015 at 20:16 UTC
Re^10: Detecting memory leaks. by Steve_BZ (Chaplain) on May 07, 2015 at 10:25 UTC
Hi Anon, Thanks for your continuing interest! Is there some way I can decode the octal references and therefore maybe step through any arrays or hashes looking for content? Regards.	[reply]
Re^11: Detecting memory leaks. by Anonymous Monk on May 07, 2015 at 11:01 UTC
Maybe, i never tried, i got by with narrow/review. why not try the other mod?	[reply]
Re^10: Detecting memory leaks. by Anonymous Monk on May 07, 2015 at 09:52 UTC
then do a code review looking for references looking for CIRCULAR references which you can Scalar::Util#weaken	[reply]


Just another Perl shrine
	PerlMonks