{"id":379,"date":"2016-03-14T03:17:49","date_gmt":"2016-03-14T03:17:49","guid":{"rendered":"http:\/\/www.editspecialists.com\/blog\/?p=379"},"modified":"2016-03-20T23:56:42","modified_gmt":"2016-03-20T23:56:42","slug":"gpu-vs-cpu","status":"publish","type":"post","link":"https:\/\/www.editspecialists.com\/blog\/index.php\/gpu-vs-cpu\/","title":{"rendered":"GPU vs CPU how do they divide the work?"},"content":{"rendered":"
\"image_pdf\"<\/a>\"image_print\"<\/a><\/div>

The basic components of an NLE are:<\/p>\n

1. Media files stored on an external HD
\n-Media access speed is determined by: HD speed<\/a>, Raid level<\/a> and connection speed to workstation.<\/a>
\n2. CPU> decode, encode and calculate\u00a0non-accelerated effects.
\n3. GPU>accelerates:<\/a>
\nAlpha Adjust, Basic 3D, Black & White, Brightness & Contrast
\nColor Balance (RGB), Color Pass (Windows only)
\nColor Replace, Crop Drop Shadow, Edge Feather, Eight&Four-Point Garbage Matte
\nExtract, Fast Color Corrector, Gamma Correction, Garbage Matte (4, 8, 16)
\nGaussian Blur, Horizontal Flip, Levels, Luma Corrector, Luma Curve, Noise
\nProc Amp, RGB Curves, RGB Color Corrector,\u00a0Sharpen
\nSixteen-Point Garbage Matte, Three-way Color Corrector, Timecode
\nTint, Track Matte Key, Ultra Keyer, Video Limiter, Vertical Flip
\nCross Dissolve, Dip to Black, Dip to White, Directional Blur, Fast Blur, Invert, Additive Dissolve, Film Dissolve, Warp Stabilizer<\/p>\n

7\u00a0steps to render\/playback a frame:<\/strong>
\n1. Frame\u00a0is fetched from disk.
\n2. CPU decodes the frame (CODEC has to be properly installed<\/a>)
\n3. Frame\u00a0is modified to an intermediate format and put into memory.
\n4. If GPU\u00a0acceleration can be used, the intermediate format is uploaded to the video card for processing.
\n5. The intermediate results are then downloaded from the video card back into memory.
\n6. The CPU starts encoding to the final delivery format.
\n7. The final results are written to disk or played on screen.<\/p>\n

A video file\u00a0gets decoded on the CPU.\u00a0Performance is determined by how well\u00a0it is optimized and if it can offload tasks to GPU or not.\u00a0A lot of codecs on PC call the QT32 process which runs in a 4GB memory space.
\n<\/a>ProRes playback is not GPU accelerated. More\u00a0cores are more\u00a0important than multiple\u00a0GPUs, as not all instructions have been written to run outside<\/div>\n
the CPU. It\u2019s a common misconception that adding a GPU will<\/div>\n
automatically take and run all the regular instructions from<\/div>\n
the CPU. Software engineers must write applications to<\/div>\n
send instructions to a specific processor before they can<\/div>\n
expect speed improvements.<\/div>\n
A\u00a0typical system with eight cores\u00a0needs 3 GB per core, which equals 24 GB of RAM required\u00a0by After Effects to run multiprocessing properly.
\nAlthough\u00a0that fits into a 32 GB computer, After Effects may still hold as<\/div>\n
much as 6 GB of RAM for other applications, bringing the full<\/div>\n
amount of RAM left for After Effects to 24, which is already<\/div>\n
\n

close to the limit.<\/p>\n<\/div>\n

This applies to Windows\/PC only:
\nBelow Playback the way it should be: Low CPU load\u00a0and\u00a0Disk I\/O at the bit rate of the codec. Note the files on the timeline being read in the Disk I\/O list.
\n\"1AVID_AVID-MXF_PLAY_NO_FILTER\"<\/a>
\nNow look\u00a0what happens when playing back a ProRes\u00a0QuickTime in Premiere on a PC
\n1. CPU cycles taken up by Premiere
\n2. CPU cycles taken up by the QT32 process
\n3-8 The files on disk being read by the QT32 process including:
\n9 pagefile.sys the Page File it has to keep writing and reading off the drive to compensate for the 4GB memory limit.
\n\"PR_PRO_PLAY_NO_FILTER_pagefile\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The basic components of an NLE are: 1. Media files stored on an external HD -Media access speed is determined by: HD speed, Raid level and connection speed to workstation. 2. CPU> decode, encode and calculate\u00a0non-accelerated effects. 3. GPU>accelerates: Alpha Adjust, Basic 3D, Black & White, Brightness & Contrast Color Balance (RGB), Color Pass (Windows … <\/p>\n

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