• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Heap and memory zone queries
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Heap and memory zone queries

  • Subject: Heap and memory zone queries
  • From: "email@hidden" <email@hidden>
  • Date: Sun, 6 Dec 2009 21:57:40 +0000
I have been using heap(1) to examine my apps heap. Small section for the auto_zone is shown. Queries follow.

Zone auto_zone_0x2f6000: 70460 nodes (53237600 bytes)

    COUNT     BYTES       AVG   CLASS_NAME                                       TYPE    BINARY
    =====     =====       ===   ==========                                       ====    ======
    21999  41322304    1878.4   non-object
    13643   9837536     721.1   NSCFString                                       ObjC    CoreFoundation
     4928    236544      48.0   NSCFDictionary                                   ObjC    Foundation
     4846     77536      16.0   NSCFNumber                                       ObjC    Foundation
     4455    161344      36.2   NSCFArray                                        ObjC    Foundation
     1684    242496     144.0   CTRun                                            CFType  CoreText
      828    169072     204.2   NSCFData                                         ObjC    Foundation
      681     43584      64.0   NSBitmapImageRep                                 ObjC    AppKit
      595     57120      96.0   NSConcretePointerArray                           ObjC    Foundation
      593    132832     224.0   _NSViewAuxiliary                                 ObjC    AppKit
      584     37376      64.0   NSKeyValueObservance                             ObjC    Foundation
      548     17536      32.0   NSCFSet                                          ObjC    Foundation
      421     20208      48.0   _NSImageAuxiliary                                ObjC    AppKit
      421     13472      32.0   NSImage                                          ObjC    AppKit
      406     19488      48.0   NSCellAuxiliary                                  ObjC    AppKit
      351     11232      32.0   NSCalibratedRGBColor                             ObjC    AppKit

My app loads up some text and displays it in a couple of NSTextViews.
The text occupies about 6MB.
Loading the text increase real memory usage by about 50MB.

1. GC is on. Does that mean that all allocations invocation by NS*/CF* will be in the auto_zone?
2. Are the allocations accomplished using NSZoneMalloc and CFAllocatorAllocate?
3. grepping the heap(1) output shows little data allocated to NSText* instances. Is some of the 40MB of non-object data allocated by the NSText system? for glyph storage?
4. If 3 is not utterly incorrect - why isn't the memory utilised by  the NSText system flagged as being allocated by NSText*.

I thought that looking at the source for CFAllocatorAllocate() might be illuminating but it's not part of the open source CFLite release.

Regards

Jonathan Mitchell

Developer
http://www.mugginsoft.com






_______________________________________________

Cocoa-dev mailing list (email@hidden)

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:

This email sent to email@hidden
  • Follow-Ups:
    • Re: Heap and memory zone queries
      • From: Andrew Farmer <email@hidden>
  • Prev by Date: Re: NSPopUpButton questions
  • Next by Date: Re: Best way to hook into the run loop?
  • Previous by thread: [MEET] CocoaHeads-NYC this Thursday (*note location*)
  • Next by thread: Re: Heap and memory zone queries
  • Index(es):
    • Date
    • Thread