pbzip2 isn't faster

["René J.V. Bertin"]

On Apr 04, 2014, at 17:26, Eric A. Borisch wrote:

I must confirm Ryan's observation:

1.784_portia_936# time bzip2 -dc /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2 > /dev/null
39.516 user_cpu 0.198 kernel_cpu 0:39.75 total_time 99.8%CPU {0W 0X 0D 0K 0M 0F 0R 0I 0O 0r 0s 0k 2w 0c}
# time bzip2 -dc /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2 > /dev/null
39.191 user_cpu 0.176 kernel_cpu 0:39.36 total_time 100.0%CPU {0W 0X 0D 0K 0M 0F 0R 2I 0O 0r 0s 0k 2w 0c}
# time pbzip2 -dc /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2 > /dev/null
41.739 user_cpu 0.132 kernel_cpu 0:41.62 total_time 100.5%CPU {0W 0X 0D 0K 0M 0F 0R 0I 0O 0r 0s 0k 2w 0c}
# time pbzip2 -dc /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2 > /dev/null
41.942 user_cpu 0.124 kernel_cpu 0:41.80 total_time 100.6%CPU {0W 0X 0D 0K 0M 0F 0R 0I 0O 0r 0s 0k 1w 0c}
6# time pbzip2 -v -dc /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2 > /dev/null
Parallel BZIP2 v1.1.8 - by: Jeff Gilchrist [http://compression.ca]
[Jun. 10, 2012]               (uses libbzip2 by Julian Seward)
Major contributions: Yavor Nikolov <nikolov.javor+pbzip2 at gmail.com>

         # CPUs: 4
 Maximum Memory: 100 MB
 Ignore Trailing Garbage: off
-------------------------------------------
         File #: 1 of 1
     Input Name: /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2
    Output Name: <stdout>

 BWT Block Size: 900k
     Input Size: 272168185 bytes
Decompressing data...
    Output Size: 1218385920 bytes
-------------------------------------------

     Wall Clock: 40.797562 seconds
40.935 user_cpu 0.131 kernel_cpu 0:40.80 total_time 100.6%CPU {0W 0X 0D 0K 0M 0F 0R 0I 0O 0r 0s 0k 1w 0c}

# time pbzip2 -v -rdc /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2 > /dev/null
Parallel BZIP2 v1.1.8 - by: Jeff Gilchrist [http://compression.ca]
[Jun. 10, 2012]               (uses libbzip2 by Julian Seward)
Major contributions: Yavor Nikolov <nikolov.javor+pbzip2 at gmail.com>

         # CPUs: 4
 Maximum Memory: 100 MB
 Ignore Trailing Garbage: off
-------------------------------------------
         File #: 1 of 1
     Input Name: /opt/local/var//macports/software/clang-3.4/clang-3.4-3.4_0+analyzer+python27.darwin_10.x86_64.tbz2
    Output Name: <stdout>

 BWT Block Size: 900k
     Input Size: 272168185 bytes
*Warning* Max memory limit increased to 816 MB to support 4 CPUs
Decompressing data...
    Output Size: 1218385920 bytes
-------------------------------------------

     Wall Clock: 39.034284 seconds
39.174 user_cpu 0.125 kernel_cpu 0:39.03 total_time 100.6%CPU {0W 0X 0D 0K 0M 0F 0R 0I 1O 0r 0s 0k 1w 0c}


R