8:bonnie
From Linux Man Pages
bonnie++ - program to test hard drive performance.
Contents |
SYNOPSIS
bonnie++ [-d dir] [-s size(Mb)[:chunk-size(b)]] [-n number-to-stat(*1024)[:max-size[:min-size][:num-directo-
ries]]] [-m machine-name] [-r ram-size-in-Mb] [-x number-of-tests] [-u uid-to-use:gid-to-use] [-g gid-to-use]
[-q] [-f] [-b] [-p processes | -y]
DESCRIPTION
This manual page documents briefly the bonnie++, program.
Bonnie++ is a program to test hard drives and file systems for performance or the lack therof. There are a many
different types of file system operations which different applications use to different degrees. Bonnie++ tests
some of them and for each test gives a result of the amount of work done per second and the percentage of CPU
time this took. For performance results higher numbers are better, for CPU usage lower are better (NB a configu-
ration scoring a performance result of 2000 and a CPU result of 90% is better in terms of CPU use than a configu-
ration delivering performance of 1000 and CPU usage of 60%).
There are two sections to the program's operations. The first is to test the IO throughput in a fashion that is
designed to simulate some types of database applications. The second is to test creation, reading, and deleting
many small files in a fashion similar to the usage patterns of programs such as Squid or INN.
All the details of the tests performed by Bonnie++ are contained in the file /usr/share/doc/bonnie++/readme.html
OPTIONS
For Bonnie++ 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(s) for IO performance measures in megabytes. If the size is greater than 1G then mul-
tiple files will be used to store the data, and each file will be up to 1G in size. This parameter may
include the chunk size seperated from the size by a colon. The chunk-size is measured in bytes and must
be a power of two from 256 to 1048576. NB You can specify the size in giga-bytes or the chunk-size in
kilo-bytes if you add 'g' or 'k' to the end of the number respectively.
If the specified size is 0 then this test will be skipped.
-n the number of files for the file creation test. This is measured in multiples of 1024 files. This is
because no-one will want to test less than 1024 files, and we need the extra space on braille displays.
If the specified number is 0 then this test will be skipped.
The default for this test is to test with 0 byte files. To use files of other sizes you can specify num-
ber:max:min:num-directories where max is the maximum size and min is the minimum size (both default to 0
if not specified). If minimum and maximum sizes are specified then every file will have a random size from
the range min..max inclusive. If you specify a number of directories then the files will be evenly dis-
tributed amoung that many sub-directories.
If max is -1 then hard links will be created instead of files. If max is -2 then soft links will be cre-
ated instead of files.
-m name of the machine - for display purposes only.
-r RAM size in megabytes. If you specify this the other parameters will be checked to ensure they make sense
for a machine of that much RAM. You should not need to do this in general use as it should be able to
discover the RAM size. NB If you specify a size of 0 then all checks will be disabled...
-x number of test runs. This is useful if you want to perform more than one test. It will dump output con-
tinuously in CSV format until either the number of tests have been completed, or it is killed.
-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 nogroup.
-g group-id to use. Same as using :group for the -u parameter, just a different way to specify it for com-
patibility with other programs.
-q quiet mode. If specified then some of the extra informational messages will be suppressed.
-f fast mode, skips per-char IO tests.
-b no write buffering. fsync() after every write.
-p number of processes to serve semaphores for. This is used to create the semaphores for synchronising mul-
tiple Bonnie++ processes. All the processes which are told to use the semaphore with -y will start each
test at the same time. Use the value -1 to delete the semaphore.
-y wait for semaphore before each test.
OUTPUT
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. Also I have included the programs bon_csv2html and bon_csv2txt to convert CSV data to HTML and
plain-ascii respectively.
For every test two numbers are reported, the amount of work done (higher numbers are better) and the percentage
of CPU time taken to perform the work (lower numbers are better). If a test completes in less than 1 second then
the output will be displayed as "++++". This is because such a test result can't be calculated accurately due to
rounding errors and I would rather display no result than a wrong result.
SIGNALS
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.
BUGS
The random file sizes will add up to different values for different test runs. I plan to add some code that
checks the sum and ensures that the sum of the values will be the same on seperate runs.
RELATED
bon_csv2html(1), bon_csv2txt(1)
bonnie++(1)