has been in beta for a long time. The last major beta release was in October 2004 but renewed development began and stopped again in November 2007 with a v0.5 beta 1 release. The new features of v0.5 include a much upgraded and faster OpenGL backend which uses framebuffer objects instead of PBuffers and harmonised the code around standard OpenGL interfaces instead of using proprietary vendor extensions. GLSL support was added which brings all the functionality previously only supported by DirectX 9 to OpenGL. In particular, this means that Brook is now just as capable on Linux as Windows. Other improvements in the v0.5 series include multi-backend usage whereby different threads can run different Brook programs concurrently and SSE and OpenMP support for the CPU backend.
Performance comparison
A like for like comparison between desktop CPUs and GPGPUs is problematic because of algorithmic & structural differences. For example, a 2.66 GHz Intel Core 2 Duo can perform a maximum of 25 GFLOPs if optimally using SSE and streaming memory access so the prefetcher works perfectly. However, traditionally most GPGPU kernels tend to perform relatively small amounts of work on large amounts of data in parallel, so the big problem with directly executing GPGPU algorithms on desktop CPUs is vastly lower memory bandwidth as generally speaking the CPU spends most of its time waiting on RAM. As an example, dual-channel PC2-6400 DDR2 RAM can throughput about 11 Gbit/s which is around 1.5 GFLOPs maximum given that there is a total of 3 GFLOPs total bandwidth and one must both read and write. As a result, if memory bandwidth constrained, Brook's CPU backend won't exceed 2 GFLOPs. In practice, it's even lower than that most especially for anything other than float4 which is the only data type which can be SSE accelerated. On an ATI HD 2900 XT, Brook can perform a maximum of 410 GFLOPs via its DirectX 9 backend. OpenGL is currently much less efficient as a GPGPU backend on that GPU, so Brook can only manage 210 GFLOPs when using OpenGL on that GPU. On paper, this looks like around twenty times faster than the CPU, but as just explained it isn't as easy as that. GPUs currently have major branch and read/write access penalties so expect a reasonable maximum of one third of the peak maximum in real world code - this still leaves that ATI card at around 125 GFLOPs some five times faster than the Intel Core 2 Duo. However this discounts the important part of transferring the data to be processed to and from the GPU. With a PCI Express 1.0 x8 interface, the memory of an ATI HD 2900 XT can be written to at about 730 Mbit/s and read from at about 311 Mbit/s which is significantly slower than normal PC memory. For large datasets, this can greatly diminish the speed increase of using a GPU over a well-tuned CPU implementation. Of course, as GPUs become faster far more quickly than CPUs and the PCI Express interface improves, it will make more sense to offload large processing to GPUs.
