Applied Mathematicsematics

High-performance and Hardware-aware Computing: Proceedings by Rainer Buchty, Jan-Philipp Weib

By Rainer Buchty, Jan-Philipp Weib

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The second is the more up-to-date IBM qs22 blade. In contrast to its predecessor it offers 2x4 GB DDR2-SDRAM and an advanced Double Precision Floating Point Unit which is not utilized by our implementation. 2 Ghz and 256 MB XDR DRAM. However only six SPEs are activated for user applications on the PS3. All processors are running Linux as the operating system. The volume data set used for rendering is retrieved from a x-rayed backpack (see figure 7) that represents a typical item at an airport screening line.

This subsequent transformation will not be considered here as it can be computed for example during a post-processing step. For the application in algebraic reconstruction, a pre-processing of the original X-ray images may be also appropriate to fit the ray caster projections. NVIDIA GeForce 8800GTX B. Implementation in CUDA CUDA offers an easy to use C-like application programming interface with some extensions. There are two different parts in each CUDA implementation: A host part, which executes in a CPU thread, and a device part (kernel), which is invoked by the controlling CPU thread, but runs in parallel on the GPU device.

Porter and T. Duff. Compositing digital images. Computer Graphics, 18(3):253–259, July 1984. [13] C. E. Shannon. Communication in the presence of noise. In Proc. IRE, 1949. A PPENDIX A. SPU Kernel Code Listing The C/C++ source code provided here is taken from our working implementation. For reasons of insufficient space the initialization code and the the actual volume sampling code had to be omitted. # d e f i n e SLICE BUFFER SIZE 32∗1024 # d e f i n e RAY PACKET BUFFER SIZE 16∗1024 # d e f i n e LIST HEADER BUFFER SIZE 1024 # d e f i n e MAIL NUM LISTELEM ( a ) s p u a d d ( s p u a n d ( a , 0 x000000ff ) , 1 ) # d e f i n e MAIL NUM PACKET( a ) s p u a n d ( s p u r l m a s k ( a , −8 ) , 0 x000000ff ) # d e f i n e MAIL INDEX CAM( a ) s p u a n d ( s p u r l m a s k ( a , −16 ) , 0 x000000ff ) # d e f i n e MAIL NEXT SLICE ( a ) s p u r l m a s k ( s p u a n d ( a , 0 x01000000 ) , −24 ) # d e f i n e MAIL NEXT SUBSLICE ( a ) s p u a n d ( a , 0 x02000000 ) # d e f i n e MAIL STOP RENDERING ( a ) s p u a n d ( a , 0 x04000000 ) c l a s s VolumeViewer{ uchar s l i c e B u f f e r [ 2 ] [ SLICE BUFFER SIZE ] attribute (( aligned (128) ) ) ; uchar r a y P a c k e t B u f f e r [ 3 ] [ RAY PACKET BUFFER SIZE ] attribute (( aligned (128) ) ) ; uchar l i s t H e a d e r B u f f e r [ 3 ] [ LIST HEADER BUFFER SIZE ] attribute (( aligned (128) ) ) ; vec float4 transferTable [256] attribute (( aligned (128) ) ) ; SpuData d a t a attribute (( aligned (128) ) ) ; public : void r e n d e r ( ullong ea ) ; 23 c o n s t v e c u i n t 4 msi mask = spu cmpeq ( s u b s l i c e I n d e x , VEC MAXSLICEINDEX ) ; s u b s l i c e I n d e x = spu andc ( spu add ( s u b s l i c e I n d e x , 4) , msi mask ) ; }; v o i d VolumeViewer : : r e n d e r ( u l l o n g e a ) { / / no s p a c e f o r a l l i n i t c o d e v e c u i n t 4 s t a r t Y , s l i c e Y , o f f s e t Y , o f f s e t Z , dimX , s u b s l i c e I n d e x , subOffsetLUT , c u r B u f f e r I n d e x , c u r M a i l , p p u L i s t E l e m e n t O f f s e t , VEC MAXSLICEINDEX , VEC SLICEBUFFER SIZE , VEC SLICEBUFFERPART SIZE , VEC SLICE SIZE , VEC SUBSLICE SIZE , c u r S l a b A d r ; v e c f l o a t 4 bMinX , bMaxX , VEC FLT MIN ; uint dBufferIdx , nextSlabIndex , ppuSliceBufferOffset , subsliceTransferSize ; / / l o c a l s t o r e address of slab data f or t h i s i t e r a t i o n c u r S l a b A d r = s p u s p l a t s ( ( u i n t )&s l i c e B u f f e r [ 0 ] [ 0 ] + nextSlabIndex ) ; / / l o c a l s t o r e address to s t o r e slab data for next iteration n e x t S l a b I n d e x ˆ = SLICE BUFFER SIZE ; c o n s t u i n t n e x t S l a b A d r = ( u i n t )&s l i c e B u f f e r [ 0 ] [ 0 ] + nextSlabIndex ; / / main memory o f f s e t f o r s l i c e d a t a p p u S l i c e B u f f e r O f f s e t += d a t a .

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