On May 9, 2012, at 12:58 PM, James Maxwell wrote: > I've been having problems with my app crashing with an EXC_BAD_ACCESS while > unarchiving a saved data file. The file is a graph representation of musical > structure, created by a machine learning algorithm. When the file/graph is > small there are no problems, but as I add more training material, and the > file increases in size, at a certain point it starts crashing during > unarchiving.
Are you building for OS X or iOS? If the former, then are you building for X86 or X86-64? If the former, then have you considered transitioning? :) > This morning, I tried enabling Guard Malloc (on its own, without zombies), > and was surprised to see the app crash during training, with the following > error: > > GuardMalloc[ManuScore-2438]: Failed to VM allocate 1864016 bytes > GuardMalloc[ManuScore-2438]: Explicitly trapping into debugger!!! > > > Is it simply running out of VM while trying to build the graph? Yes. > If so, why doesn't this happen with Guard Malloc off? Turning Guard Malloc on greatly increases the overall memory usage of the process. > Also, with zombies and guard malloc off, why is it only when reading the file > that the app crashes, not during training (i.e., while the graph is being > built)? You can see for yourself by running your app in Instruments using the object allocations instrument. This is just a guess, but what might be happening is the reading process is directly or indirectly generating many temporary objects that are being pushed into the autorelease/collection pool, which is bulging after a while. If you're using RR or ARC memory management, then you can fix this by grouping code that generates temporary objects into @autoreleasepool blocks. If you're using GC memory management, then you might need to manually run the collector more often. Nick Zitzmann <http://www.chronosnet.com/> _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
