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Man Pages


Manual Reference Pages  -  MDTEST (1)

NAME

mdtest - test file system metadata performance

CONTENTS

Synopsis
Description
Options
Examples

SYNOPSIS

mdtest [-options]

DESCRIPTION

mdtest is a file system metadata performance test designed to run in a cluster MPI environment against parallel file systems.

In each iteration of the test, each MPI task creates, stats, and removes the specified number of directories and/or files and measures the performance in ops/second. After all the iterations complete, the maximum, minimum, mean ops/sec and the std. deviation are reported for each operation.

OPTIONS

-b branching_factor
  The branching factor of the hierarchical directory structure [default: 1].
-B No barriers will be taken between the phases (create/stat/remove) of the tests.
-c Use ‘‘collective creates’’, meaning task 0 does all the creates.
-C Only perform the create phase of the tests.
-d testdir[@testdir2]
  The directory in which the tests will run. For multiple pathes, must use fully-qualified pathnames. [default: working directory of mdtest].
-D Perform test on directories only (no files).
-e bytes
  Set the number of Bytes to read from each file [default: 0].
-E Only perform the read phase of the tests.
-f first
  The first number of tasks on which the test will run [default: 0].
-F Perform test on files only (no directories).
-h Display help message.
-i iterations
  The number of iterations the test will run [default: 1].
-I items_per_directory
  The number of items per directory in the tree [default: 0].
-l last
  The last number of tasks on which the test will run [default: 0].
-L Files/directories only created at the leaf level of the tree.
-n number_of_items
  Every process will creat/stat/remove # directories and files [default: 0].
-N stride
  Stride # between neighbor tasks for file/dir stat, 0 = local [default: 0].
-p seconds
  Pre-iteration delay (in seconds).
-r Only perform the remove phase of the tests.
-R[seed]
  Randomly stat files. There is an optional argument that provides a seed to the random number generator. (Note: There is no space between the -R
and the seed if one is provided.)
-s stride
  Stride between the number of tasks for each test [default: 1].
-S Shared file access (file only, no directories).
-t Include unique working directory management overhead in the results (presumes -u option).
-T Only perform the stat phase of the tests.
-u Create a unique working directory for each task (presumes -d option).
-v Increase verbosity (each instance of option increments by one).
-V value
  Set verbosity value [default: 0].
-w bytes
  Set the number of Bytes to write to each file after it is created [default: 0].
-z tree_depth
  The depth of the hierarchical directory tree [default: 0].

EXAMPLES

    Example 1

$ mpirun -n 2 ./mdtest -d /tmp/z -n 100 -i 2

-- started at 11/23/2009 09:05:29 --

mdtest-1.8.1 was launched with 2 total task(s) on 1 nodes Command line used: ./mdtest -d /tmp/z -n 100 -i 2 Path: /tmp FS: 28.8 GiB Used FS: 8.6% 8.6%Inodes: 1.8 Mi Used Inodes: 5.1%

time to create tree: 0.000078 sec tree creation rate: 12826.617737 ops/sec

2 tasks, 200 files/directories

SUMMARY: (of 2 iterations) Operation Max Min Mean Std Dev --------- --- --- ---- ------- Directory creation: 21489.415 17447.551 19468.483 2020.932 Directory stat : 154657.227 28731.061 91694.144 62963.083 Directory removal : 146756.613 21489.415 84123.014 62633.599 File creation : 42024.989 28731.061 35378.025 6646.964 File stat : 146756.613 17447.551 82102.082 64654.531 File removal : 156884.384 42024.989 99454.686 57429.698 time to remove tree: 0.001031 sec tree removal rate: 970.005550 ops/sec

-- finished at 11/23/2009 09:05:29 --

    Example 2

$ mpirun -np 2 -H pc6 ./mdtest -d /tmp/z -b 2 -z 3 -I 10

-- started at 11/23/2009 09:09:23 --

mdtest-1.8.1 was launched with 2 total task(s) on 1 nodes Command line used: ./mdtest -d /tmp/z -b 2 -z 3 -I 10 Path: /tmp FS: 28.8 GiB Used FS: 8.6% 8.6%Inodes: 1.8 Mi Used Inodes: 5.1%

time to create tree: 0.000765 sec tree creation rate: 19605.659084 ops/sec

2 tasks, 300 files/directories

SUMMARY: (of 1 iterations) Operation Max Min Mean Std Dev --------- --- --- ---- ------- Directory creation: 29365.707 29365.707 29365.707 0.000 Directory stat : 123701.455 123701.455 123701.455 0.000 Directory removal : 25623.459 25623.459 25623.459 0.000 File creation : 38704.743 38704.743 38704.743 0.000 File stat : 125477.782 125477.782 125477.782 0.000 File removal : 51911.845 51911.845 51911.845 0.000

time to remove tree: 0.000940 sec tree removal rate: 15960.060883 ops/sec

-- finished at 11/23/2009 09:09:23 --

SEE ALSO

http://sourceforge.net/projects/mdtest
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mdtest-1.8.3 MDTEST (1) 2010-05-05

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