search for: gsoc_2008

...e functions: (c_dec_dc_unpredict_mcu_plane + oc_dec_frags_recon_mcu_plane) and (oc_state_loop_filter_frag_rows + oc_state_borders_fill_rows) as explained in my previous email. But the results were not good. They were equal the implementation without pipeline. http://lampiao.lsc.ic.unicamp.br/~piga/gsoc_2008/comparison.png http://lampiao.lsc.ic.unicamp.br/~piga/gsoc_2008/speedup.png http://lampiao.lsc.ic.unicamp.br/~piga/gsoc_2008/systime.png Next I tried to do some improvements, but without success. I think that the implementation as it is, could not be improved more with parallelism. Another appro...

Shows that as the MCU increases, the OpenMP extra overhead is amortized and OpenMP becomes as fast as the pthreads implementation. The last chart http://lampiao.lsc.ic.unicamp.br/~piga/gsoc_2008/systime.png Shows that both pthreads and OpenMP overhead decreases as what seems to be a logarithmic function of the MCU size. This was a great experiment, and from what I can conclude, the OpenMP implementation can be as good as the pthread. Therefore maybe it is worth to work on a OpenMP impl...

...many times. The time spent to create and synchronize threads is greater than the speed up gains. We need functions that are called a few times and spend many cpu time. Also data dependency should be the lowest as possible. According to the model that i did ( http://lampiao.lsc.ic.unicamp.br/~piga/gsoc_2008/implementation.pdf<http://lampiao.lsc.ic.unicamp.br/%7Epiga/gsoc_2008/implementation.pdf>) the decoding time should be reduced in 33%, but it was just 10% for pthread an 5% for openMP. I used a video with 1440x1080. The pthread implementation has 3 threads and the OpenMP was executed with th...

Hi, I'm considering submitting a project for this year's Google Summer of Code program that would involve making progress on hardware accelerated video decoding for the nouveau driver and wanted some feedback. I know that this isn't a big priority at the moment amongst the regular contributors, but I think it would make a good GSOC project because of it's somewhat narrow scope. I