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http://www.openoffice.org/issues/show_bug.cgi?id=66680
Issue #|66680
Summary|shrink ImageList memory usage ...
Component|gsl
Version|680m174
Platform|All
URL|
OS/Version|All
Status|NEW
Status whiteboard|
Keywords|
Resolution|
Issue type|PATCH
Priority|P3
Subcomponent|code
Assigned to|ka
Reported by|mmeeks
------- Additional comments from [EMAIL PROTECTED] Fri Jun 23 02:25:45 -0700
2006 -------
So - this patch is several things:
1st: binning a chunk of complex & unused API, and re-factoring any uses to
simplify our API profile here.
2nd: simplifying the ImageList - storing BitmapEx's instead of image strips:
this has several benefits:
+ substantially reduces working set - horizontal ImageLists
are bad news here
+ reduces memory allocation:
+ we demand load images - so far fewer are in-core
+ all BitmapEx's are unique & shared across all top-levels
(by the impimagetree hash) instead of being duplicated in
that hash, and also in an ImageList strip [ which tends to
also be duplicated per window ]. ie. we turn a substantial
per-window cost (500k?) into a per-app cost.
+ reduces per-user disk cost
+ removes any ~/.ooo-2.0/user/config/imagecache usage - good
for multi-user systems [ saves ~2.5Mb per user or so ], also
kills any network latency effects from NFS mounted homes at
startup relating to this.
+ also using a per-system shared, mmapped 'images.zip' to read
read these icons, saves a chunk of I/O in shared systems for
the imagecache - since it'll be warm.
+ reduces code complexity
+ this is a net code size reduction
3rdly: performance neutral
+ my measurements suggest this makes startup neither substantially
faster, nor slower - but clearly that will vary depending on
available memory, processor speed and should give a net win -
particularly from reduced working set size.
+ also when combined with i#66679# should not generate cold start
seeking pain.
Potential downsides - changes the VCL API, but doesn't break the ABI - ie. if we
just update the various dependant libraries - all should be well.
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