[oletange]

Ideas for next video are most welcome. The ideal task:

1. Is single threaded 2. Takes a lot of CPU 3. Is a task that everyone can understand and relate to and which is close to a real world scenario

I have loads of examples meeting requirement 1+2. It is 3 that is the hard part.

Post them to [e-mail]

[surki]

How about doing something with imagemagick or mencoder? I think video encoding/decoding gives a nice balance between disk and cpu usage.

[eschulte]

Here's an imagemagick example; over six minutes with xargs, under 20 seconds with parallel

  $ ls *.png |wc -l
  3580

  $ time ls|sed 's/\(.*\)\..*/\1/'|parallel convert {}.png {}.ppm
  ls --color  0.00s user 0.01s system 63% cpu 0.016 total
  sed 's/\(.*\)\..*/\1/'  0.01s user 0.00s system 39% cpu 0.025 total
  parallel convert {}.png {}.ppm  97.39s user 61.87s system 890% cpu 17.883 total

  $ time ls|sed 's/\(.*\)\..*/\1/'|xargs -I {} convert {}.png {}.ppm
  ls --color  0.01s user 0.00s system 63% cpu 0.016 total
  sed 's/\(.*\)\..*/\1/'  0.01s user 0.00s system 39% cpu 0.025 total
  xargs -I {} convert {}.png {}.ppm  93.08s user 47.88s system 38% cpu 6:10.88 total