> From: Stuart Rogers <stuart.rog...@me.com>
> Date: August 17, 2010 6:10:45 AM EDT
> To: cocoa-dev@lists.apple.com
> Subject: Losing my memory - a caching problem?
>
> I'm having enormous difficulty keeping tabs on memory usage in my current
> project. I'm happy that I'm not leaking anything - Build & Analyse reports no
> issues, and neither does Instruments (Object Allocations and Leaks). And yet,
> when watching bulk memory usage I see my free RAM dropping like a stone
> (at the expense of my inactive RAM) and within seconds it has chewed through
> 8GB and starts kicking off extra page files. The active RAM usage is fairly
> modest, and nearer to what I would expect.
>
> <<SNIP>>
>
> - (ImageSignature*)signatureForImage:(CGImageRef)img
> {
> // Create a CIImage by passing the image through our filter chain.
> CIImage *ciImage = [self filteredImage:(CGImageRef)img];
>
> // Create a bitmap and paint our CIImage into it.
> NSBitmapImageRep *inBmpImgRep = [[[NSBitmapImageRep alloc]
> initWithCIImage:ciImage] autorelease];
> NSInteger pixelsWide = [inBmpImgRep size].width;
> NSInteger pixelsHigh = [inBmpImgRep size].height;
> NSInteger samplesPerPixel = 4;
> NSBitmapImageRep *bmpImgRep = [[[NSBitmapImageRep alloc]
> initWithBitmapDataPlanes:NULL
> pixelsWide:pixelsWide pixelsHigh:pixelsHigh
> bitsPerSample:8
> samplesPerPixel:samplesPerPixel hasAlpha:YES
> isPlanar:NO
> colorSpaceName:NSDeviceRGBColorSpace
> bitmapFormat:0
> bytesPerRow:0 bitsPerPixel:0] autorelease];
> [NSGraphicsContext saveGraphicsState];
> [NSGraphicsContext setCurrentContext:[NSGraphicsContext
> graphicsContextWithBitmapImageRep:bmpImgRep]];
> [inBmpImgRep draw];
> [NSGraphicsContext restoreGraphicsState];
>
> // Create an ImageSignature and paint our bitmap into it.
> ImageSignature *sig = [[[ImageSignature alloc] initWithSize:[bmpImgRep
> size]] autorelease];
> float *buffer = [sig allItems];
>
> // Signature creation snipped - it's a simple mapping of pixels to a float
> array
>
> return sig;
> }
>
> <<SNIP>>
One dumb question; I see where you're putting images into an autorelease pool,
but I don't see you setting up or tearing down pools. Where are you doing that?
Thanks,
Cem Karan_______________________________________________
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