KDevelop memory footprint

[René J.V. Bertin]

On Wednesday June 07 2017 11:01:10 Milian Wolff wrote:
> On Wednesday, June 7, 2017 10:59:06 AM CEST René J.V. Bertin wrote:
> > On Wednesday June 07 2017 10:29:11 Milian Wolff wrote:
> > >It depends. Do you have lots of documents open? Then yes, the memory usage
> > 
> > What is "lots" here?
> 
> More than 10? Hard to say.

The session in question opens with 4 .cpp files, 1 C++ header, 1 C header and 1 .c file, which account for around 470Mb "real memory". Adding 4 more ObjC++ files gets me to the aforementioned footprint.
Reopening the session with just those 4 documents open also takes just shy of 500Mb "real memory", forcing a reparse by reloading all open documents increases that up to 900Mb transiently and 630Mb when done (and about 15Mb extra each additional reload).

That's a lot, more than I'd call reasonable, esp. if the footprint doesn't decrease easily after you close the documents and opening a document always comes with this kind of cost even if you open it only for a quick peek.

Rather than finding a way to evict TU data from memory it might be more productive to come up with a good way to prevent that memory usage in the first place, like a read-only state in which only cached parser data is used.

> > IOW, how many MB should we expect per open document, or
> > per Kb (or line) of open document?
> 
> These metrics don't correlate.

Are you saying that the document contents are not related?
Are these unrelated too?
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSView*" whichType: 2 Declaration is: "<notype> view" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSOpenGLLayer.h" [ (23, 26)  ->  (23, 30) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSOpenGLPixelFormat*" whichType: 2 Declaration is: "<notype> openGLPixelFormat" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSOpenGLLayer.h" [ (27, 39)  ->  (27, 56) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSOpenGLContext*" whichType: 2 Declaration is: "<notype> openGLContext" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSOpenGLLayer.h" [ (31, 35)  ->  (31, 48) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "id< NSPageControllerDelegate >*" whichType: 2 Declaration is: "<notype> delegate" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSPageController.h" [ (62, 56)  ->  (62, 64) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSViewController*" whichType: 2 Declaration is: "<notype> selectedViewController" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSPageController.h" [ (66, 46)  ->  (66, 68) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSArray*" whichType: 2 Declaration is: "<notype> arrangedObjects" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSPageController.h" [ (74, 25)  ->  (74, 40) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "id< NSPopoverDelegate >*" whichType: 2 Declaration is: "<notype> delegate" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSPopover.h" [ (117, 50)  ->  (117, 58) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSViewController*" whichType: 2 Declaration is: "<notype> contentViewController" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSPopover.h" [ (133, 45)  ->  (133, 66) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSCollectionView*" whichType: 2 Declaration is: "<notype> collectionView" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSCollectionView.h" [ (31, 39)  ->  (31, 53) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSImageView*" whichType: 2 Declaration is: "<notype> imageView" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSCollectionView.h" [ (35, 41)  ->  (35, 50) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSTextField*" whichType: 2 Declaration is: "<notype> textField" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSCollectionView.h" [ (36, 41)  ->  (36, 50) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSArray*" whichType: 2 Declaration is: "<notype> draggingImageComponents" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSCollectionView.h" [ (40, 30)  ->  (40, 53) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "id< NSTextInputClient >*" whichType: 2 Declaration is: "<notype> client" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSTextInputContext.h" [ (68, 43)  ->  (68, 49) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSArray*" whichType: 2 Declaration is: "<notype> allowedInputSourceLocales" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSTextInputContext.h" [ (76, 25)  ->  (76, 50) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSArray*" whichType: 2 Declaration is: "<notype> keyboardInputSources" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSTextInputContext.h" [ (105, 29)  ->  (105, 49) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSString*" whichType: 2 Declaration is: "<notype> selectedKeyboardInputSource" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSTextInputContext.h" [ (109, 26)  ->  (109, 53) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSString*" whichType: 2 Declaration is: "<notype> primaryString" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSTextAlternatives.h" [ (22, 31)  ->  (22, 44) ]
kdevplatform.language: WARNING: Non-function type assigned to function declaration. Type is:  "NSArray*" whichType: 2 Declaration is: "<notype> alternativeStrings" "/System/Library/Frameworks/AppKit.framework/Versions/C/Headers/NSTextAlternatives.h" [ (23, 30)  ->  (23, 48) ]

> Don't pull us into another of your guesstimate games please.

No risk of that, I'm done shooting in the dark without any attempt at assistive lighting.

R.