GPUImage slow memory accumulation - ios

Question

I looked at forums to locate similar questions, but it seems that my issue is different.
I am using GPUImage, I built framework using bash script. I looked at samples of creating filters & their chain for processing.
But in my app I am facing constant increase in memory consumption. There are no memory leaks, I profiled my app.
image - is an image taken from the camera. I call the code described bellow in for loop. I do witness memory increase starting from 7MB, to 150MB, after than the app is terminated.
Here is the code :
- (void)processImageInternal:(UIImage *)image
{
GPUImagePicture * picture = [[GPUImagePicture alloc]initWithImage:image];
GPUImageLanczosResamplingFilter *lanczosResamplingFilter = [GPUImageLanczosResamplingFilter new];
CGFloat scale = image.scale;
CGSize size = image.size;
CGFloat newScale = roundf(2*scale);
CGSize newSize = CGSizeMake((size.width *scale)/newScale,(size.height *scale)/newScale);
[lanczosResamplingFilter forceProcessingAtSize:newSize];
[picture addTarget:lanczosResamplingFilter];
GPUImageGrayscaleFilter * grayScaleFilter = [GPUImageGrayscaleFilter new];
[grayScaleFilter forceProcessingAtSize:newSize];
[lanczosResamplingFilter addTarget:grayScaleFilter];
GPUImageMedianFilter * medianFilter = [GPUImageMedianFilter new];
[medianFilter forceProcessingAtSize:newSize];
[grayScaleFilter addTarget:medianFilter];
GPUImageSharpenFilter * sharpenFilter = [GPUImageSharpenFilter new];
sharpenFilter.sharpness +=2.0;
[sharpenFilter forceProcessingAtSize:newSize];
[medianFilter addTarget:sharpenFilter];
GPUImageGaussianBlurFilter * blurFilter = [GPUImageGaussianBlurFilter new];
blurFilter.blurSize = 0.5;
[blurFilter forceProcessingAtSize:newSize];
[sharpenFilter addTarget:blurFilter];
GPUImageUnsharpMaskFilter * unsharpMask = [GPUImageUnsharpMaskFilter new];
[unsharpMask forceProcessingAtSize:newSize];
[blurFilter addTarget:unsharpMask];
[picture processImage];
image = [unsharpMask imageFromCurrentlyProcessedOutput];
}
The code is executed in background thread.
Here is calling code:
for (NSUInteger i=0;i <100;i++)
{
NSLog(#" INDEX OF I : %d",i);
[self processImageInternal:image];
}
I even added some cleanup logic into - (void)processImageInternal:(UIImage *)image method
- (void)processImageInternal:(UIImage *)image
{
.........
[picture processImage];
image = [unsharpMask imageFromCurrentlyProcessedOutput];
//clean up code....
[picture removeAllTargets];
[self releaseResourcesForGPUOutput:unsharpMask];
[self releaseResourcesForGPUOutput:blurFilter];
[self releaseResourcesForGPUOutput:sharpenFilter];
[self releaseResourcesForGPUOutput:medianFilter];
[self releaseResourcesForGPUOutput:lanczosResamplingFilter];
[self releaseResourcesForGPUOutput:grayScaleFilter];
In release method, basically I am releasing whatever is possible to release: FBO, textures, targets. Here is the code:
- (void)releaseResourcesForGPUOutput:(GPUImageOutput *) output
{
if ([output isKindOfClass:[GPUImageFilterGroup class]])
{
GPUImageFilterGroup *group = (GPUImageFilterGroup *) output;
for (NSUInteger i=0; i<group.filterCount;i++)
{
GPUImageFilter * curFilter = (GPUImageFilter * )[group filterAtIndex:i];
[self releaseResourcesForGPUFilter:curFilter];
}
[group removeAllTargets];
}
else if ([output isKindOfClass:[GPUImageFilter class]])
{
[self releaseResourcesForGPUFilter:(GPUImageFilter *)output];
}
}
Unsharp mask it GPU group filters, i.e. composite of filters.
- (void)releaseResourcesForGPUFilter:(GPUImageFilter *)filter
{
if ([filter respondsToSelector:#selector(releaseInputTexturesIfNeeded)])
{
[filter releaseInputTexturesIfNeeded];
[filter destroyFilterFBO];
[filter cleanupOutputImage];
[filter deleteOutputTexture];
[filter removeAllTargets];
}
}
I did as Brad suggested to do: My code was called in UI touch processing loop. Autorealized pool objects are drained, but from Allocation Instruments I cannot see anything strange. But my application is terminated.
Total allocation was 130 MB at the end, but for some reasons my apps was terminated.
Here is how it looks like: ( I placed screen shots, log from device, even trace from Instruments). My app is called TesseractSample, but I completely switched off tesseract usage, even its' initialisation.
http://goo.gl/w5XrVb
In log from device I see that there maximum allow rpages were used:
http://goo.gl/ImG2Wt
But I do not have an clue what it means. rpages == recent_max ( 167601)