Provided by: bonnie++_1.97.1_amd64 bug


       getc_putc - program to test hard drive performance.


       getc_putc  [-d  dir]  [-s  size(KiB)]  [-m  machine-name]  [-u  uid-to-use:gid-to-use] [-g


       This manual page documents briefly the getc_putc, program.

       This is a simple adjunct to the bonnie++ benchmark.  It is used to test  various  ways  of
       doing  IO  one  byte at a time, usually you don't need to do enough of this for it to be a
       performance issue for it to matter much which way you do it.  But sometimes it's necessary
       (for example whan parsing IO from a terminal and then launching another process which will
       take over all IO, such as a simple shell).

       The real benefits of this are to help settle some arguements about the performance of such
       things, and to educate novices about how bad per-byte IO really is.


       For  getc_putc  every  option is of the form of a hyphen followed by a letter and then the
       next parameter contains the value.

       -d     the directory to use for the tests.

       -s     the size of the file for byte IO performance measured in  kilobytes.   NB  You  can
              specify the size in mega-bytes if you add 'm' to the end of the number.

              The  default  for this test is to test with a 40MiB file.  Of the file only 1/32 of
              it will be used for write() and read() system calls (anything else takes too long),
              and only 1/4 of it will be used for locked getc() and putc().

       -m     name of the machine - for display purposes only.

       -u     user-id  to use.  When running as root specify the UID to use for the tests.  It is
              not recommended to use root, so if you really want to run as root then use -u root.
              Also if you want to specify the group to run as then use the user:group format.  If
              you specify a user by name but no group then the primary group of that user will be
              chosen.   If  you  specify  a  user  by  number and no group then the group will be

       -g     group-id to use.  Same as using :group for the -u parameter, just a  different  way
              to specify it for compatibility with other programs.

       -q     quiet  mode.  If  specified  then  some of the extra informational messages will be
              suppressed. Also the csv data will be the only output on standard out and the plain
              text  data  will  be  on  standard  error.  This  means you can run getc_putc -q >>
              file.csv to record your csv data.


       The primary output is plain-text in 80 columns which is designed to fit well  when  pasted
       into email and which will work well with Braille displays.

       The  second  type  of output is CSV (Comma Seperated Values).  This can easily be imported
       into any spread-sheet or database program.

       For every test the result is a speed in KiB/s.  I do not display the CPU time  because  it
       presumably is 99% of the power of a single CPU (or something very close to that).


       This  program,  it's  manual  page,  and  the Debian package were written by Russell Coker

       The documentation, the Perl scripts,  and  all  the  code  for  testing  the  creation  of
       thousands  of  files  was  written by Russell Coker, but the entire package is under joint
       copyright with Tim Bray.


       Handles SIGINT and does a cleanup (which may take some time), a second SIGINT or a SIGQUIT
       will cause it to immidiately die.

       SIGXCPU and SIGXFSZ act like SIGINT.

       Ignores SIGHUP.


       The source is available from .

       See for further information.


       bonnie++(8), zcav(8)