On Jun 7, 2013, at 9:44 AM, Jonathan Taylor <[email protected]>
wrote:
> Your suggestion of the VM Tracker instrument (which I had not spotted before)
> did bring up some interesting results though. These autoreleased image
> buffers that were causing the problem are definitely NOT reported at all by
> Allocations ("live" bytes stays stable at 250MB), but they do show up under
> VM Tracker as "CG image" and "CG raster data" - although I don't think
> there's a way of getting any further details about the buffers they provide
> the backing for?
Those sorts of buffers are probably magical at the kernel level — one of the
jobs of CG/Quartz is to shuffle pixmaps between CPU and GPU memory, and doing
that efficiently is important to overall graphics performance. I wouldn’t be
surprised if there were special types of memory pages that were optimized for
this, that don’t live in normal address space.
I just took a look at the Quartz Debug app and didn’t find any window for
viewing memory usage, but someone might know of other tools. Sounds like it
would be a good idea to add that to the regular memory-tracking instruments.
—Jens
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