Public bug reported:
Binary package hint: sox
The version of sox shipped with lucid enables multi-threaded processing
by default, but this results in a *dramatic* slowdown rather than an
improvement. This is what I get trying to resample a 90-second stereo
file:
% time sox --single-threaded -r 44100 -c 2 tata.sw -r 48000 foo.sw
sox --single-threaded -r 44100 -c 2 tata.sw -r 48000 tata48.sw 1.65s user
0.02s system 99% cpu 1.678 total
% time sox -r 44100 -c 2 tata.sw -r 48000 foo.sw
sox -r 44100 -c 2 tata.sw -r 48000 tata48.sw 197.17s user 0.07s system 199%
cpu 1:38.71 total
Essentially, it takes more than 50 times longer when multi-threading is
enabled (which is the default). The problem does not occur for mono
files because those do not seem to use the multi-threaded code.
What's even stranger is that the problem did not occur a few days ago.
Seems like one of the updates must have broken it.
By machine is a ThinkPad T510 with an i7 620M running Lucid for amd64.
** Affects: sox (Ubuntu)
Importance: Undecided
Status: New
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multi-threaded support broken
https://bugs.launchpad.net/bugs/589985
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