Using the Time command for Benchmarking

[matthewbauer]

I've been trying to use the time command to benchmark the speeds of LZMA, GZIP, and BZIP2.

So far I've come up with this command:

for a in 100; do for b in "bzip2" "lzma" "gzip"; do dd if=/dev/zero of=$a.$b.zero bs=${a}M count=1; time $b $a.$b.zero > $a.$b | sed "s|.* [0-9\.]*s user [0-9\.]*s system [0-9]*% cpu \([0-9\.]*\) total|\1|" >> benchmark; echo -n "," >> benchmark; done; echo >> benchmark; done

But the problem is, the Time command seems to be able to intercept my | between Time and Sed. I have the sed to write to a file that would have the data in it.

Is there anyway I could make this work?


Note: So eventually I want to be able to run:

gnuplot -persist <(echo "plot 'benchmark' with lines")

And see a graph of the time it takes to compress each compression format.

[cfajohnson]

I've been trying to use the time command to benchmark the speeds of LZMA, GZIP, and BZIP2.

So far I've come up with this command:

Please format your code so that it can be read without horizontal scrolling.

for a in 100
do
  for b in "bzip2" "lzma" "gzip"
  do
    dd if=/dev/zero of=$a.$b.zero bs=${a}M count=1
    time $b $a.$b.zero > $a.$b |
       sed "s|.* [0-9\.]*s user [0-9\.]*s system [0-9]*% cpu \([0-9\.]*\) total|\1|" >> benchmark
    echo -n "," >> benchmark
  done
  echo >> benchmark
done

But the problem is, the Time command seems to be able to intercept my | between Time and Sed. I have the sed to write to a file that would have the data in it.

Is there anyway I could make this work?

If you want to capture the output ot time:

    { time $b $a.$b.zero > $a.$b ; } 2>&2 |

[matthewbauer]

Thanks for the help, but it's still not working.

For example:

{ time ls; } 2>&2 | sed "s|.*|123|"

Will still just replace the "ls" not the "time" and if possible I'd like to stop the "ls" from displaying anything. I don't quite understand the whole 2>&2 thing so you're going to have to help me.

[matthewbauer]

bump bump

[matthewbauer]

bump bump.

[serverlinux]

bump bump.

Thanks cfajohnson, very useful!
Walter