mdtest测试工具

软件介绍

mdstest是软件的元数据操作基准测试工具，用来模拟对文件或者目录的open、stat、close操作，然后报告性能

下载软件压缩包：

yum install openmpi openmpi-devel -y
在/root/.bashrc中添加（注意也要添加mdtest的路径）
export PATH=$PATH:/usr/lib64/openmpi/bin/

source /root/.bashrc
下载
[root@lab8105 ~]# wget http://sourceforge.net/projects/mdtest/files/latest/download
解压
[root@lab8105 ~]# tar -xvf mdtest-1.9.3.tgz
修改makefile：
mdtest: mdtest.c
    mpicc -Wall -D $(OS) $(LARGE_FILE) $(MDTEST_FLAGS) -g -o mdtest mdtest.c -lm

参数如下：

Usage:  mdtest [-b #] [-B] [-c] [-C] [-d testdir] [-D] [-e] [-E] [-f first] [-F]
                [-h] [-i iterations] [-I #] [-l last] [-L] [-n #] [-N #] [-p seconds]
                [-r] [-R[#]] [-s #] [-S] [-t] [-T] [-u] [-v] [-V #] [-w #] [-y]
                [-z #]

    -b: branching factor of hierarchical directory structure
        目录树的分支参数
    -B: no barriers between phases (create/stat/remove)
            不同的阶段没有隔离 (create/stat/remove)；
    -c: collective creates: task 0 does all creates and deletes
        共同创建: task 0 完成所有的创建和删除工作；
    -C: only create files/dirs
        只创建文件或目录，不作删除；
    -d: the directory in which the tests will run
        指出测试运行的目录（若不指定，则默认当前目录）；
    -D: perform test on directories only (no files)
        只对目录操作进行测试（不包括文件）；
    -e: number of bytes to read from each file
        从每个文件读出的文件大小
    -E: only read files
        只读取文件
    -f: first number of tasks on which the test will run
        首先运行的任务号；
    -F: perform test on files only (no directories)
        只创建文件，没有目录；
    -h: prints help message
        输出帮助信息
    -i: number of iterations the test will run
        测试迭代循环次数；
    -I: number of items per tree node
        每个树节点包含的项目
    -l: last number of tasks on which the test will run
        最后运行的任务号
    -L: files/dirs created only at leaf level
        只在目录树的“叶子”层创建文件/目录；
    -n: every task will create/stat/remove # files/dirs per tree
        每个任务需要再每棵树中create/stat/remove的文件/目录数；
    -N: stride # between neighbor tasks for file/dir stat (local=0)
        遍历时指定和相邻任务的跨度
    -p: pre-iteration delay (in seconds)
        每次迭代之间延时（以秒计算）
    -r: only remove files/dirs
            删除文件/目录
    -R: randomly stat files/dirs (optional seed can be provided)
        随机遍历文件/目录 ；
    -s: stride between the number of tasks for each test
        每次测试的任务数的跨度
    -S: shared file access (file only, no directories)
        共享文件访问（只针对文件操作）；
    -t: time unique working directory overhead
        记录特定目录的时间开销
    -T: only stat files/dirs

    -u: unique working directory for each task
        为每个任务指定工作目录；
    -v: verbosity (each instance of option increments by one)

    -V: verbosity value
    -w: number of bytes to write to each file
            写到每个文件的字节数
    -y: sync file after write completion
            再写执行完后同步文件到磁盘（同步写）
    -z: depth of hierarchical directory structure
        目录树的深度；

NOTES:
    * -N allows a "read-your-neighbor" approach by setting stride to
    tasks-per-node. Do not use it with -B, as it creates race conditions.
    允许"read-your-neighbor" 方法
    * -d allows multiple paths for the form '-d fullpath1@fullpath2@fullpath3'
        可以指定多个测试路径，'-d fullpath1@fullpath2@fullpath3'
    * -B allows each task to time itself. The aggregate results reflect this
    change.
    允许每个任务对自己进行计时；
    * -n and -I cannot be used together.  -I specifies the number of files/dirs
    created per tree node, whereas the -n specifies the total number of
    files/dirs created over an entire tree.  When using -n, integer division is
    used to determine the number of files/dirs per tree node.  (E.g. if -n is
    10 and there are 4 tree nodes (z=1 and b=3), there will be 2 files/dirs per
    tree node.)

    * -R and -T can be used separately.  -R merely indicates that if files/dirs
    are going to be stat'ed, then they will be stat'ed randomly.
    不能同时使用，因为指定了每个树节点的文件/目录数量，而-I指定的是整棵树的文件/目录数量。

Illustration of terminology:

                        Hierarchical directory structure (tree)

                                    =======
                                    |       |  (tree node)
                                    =======
                                    /   |   \
                            ------    |    ------
                            /          |          \
                        =======     =======     =======
                        |       |   |       |   |       |    (leaf level)
                        =======     =======     =======

    In this example, the tree has a depth of one (z=1) and branching factor of
    three (b=3).  The node at the top of the tree is the root node.  The level
    of nodes furthest from the root is the leaf level.  All trees created by
    mdtest are balanced.
    这个例子中，目录树深度为1（z=1）,每个节点分支为3（b=3）.最上面的节点为根节点，

关于openmpi的软件的使用

openmpi是并行的运行程序，配置的时候需要注意下

增加并行的运行节点
[root@lab8105 ~]# vim /etc/openmpi-x86_64/openmpi-default-hostfile
添加
lab8105 slots=1
lab8106 slots=1
特别注意加slots 这个是配置权重的，如果不配置，第一条有默认权重，就无法在数目小时进行均衡操作
检查是否配置成功，np为操作线程数
[root@lab8105 ~]# mpirun  --allow-run-as-root -np 2 hostname
lab8105
lab8106
如果想单机执行多进程，可以用-host指定主机
[root@lab8105 ~]# mpirun -host lab8105  --allow-run-as-root -np 2 hostname

单机下多进程测试

2 task on 1 node
[root@lab8105 ~]# mpirun -host lab8105  --allow-run-as-root -np 2 mdtest -I 10  -z 5 -b 2 -d /mnt/zptest/ -t -c 2
-- started at 01/27/2015 21:06:23 --

mdtest-1.9.3 was launched with 2 total task(s) on 1 node(s)
Command line used: mdtest -I 10 -z 5 -b 2 -d /mnt/zptest/ -t -c 2
Path: /mnt/zptest
FS: 6.5 TiB   Used FS: 59.2%   Inodes: 0.6 Mi   Used Inodes: 100.0%

2 tasks, 1260 files/directories

SUMMARY: (of 1 iterations)
    Operation                      Max            Min           Mean        Std Dev
    ---------                      ---            ---           ----        -------
    Directory creation:        312.088        312.088        312.088          0.000
    Directory stat    :      73447.245      73447.245      73447.245          0.000
    Directory removal :        255.755        255.755        255.755          0.000
    File creation     :        638.824        638.824        638.824          0.000
    File stat         :      86747.366      86747.366      86747.366          0.000
    File read         :      84434.232      84434.232      84434.232          0.000
    File removal      :        207.545        207.545        207.545          0.000
    Tree creation     :         39.062         39.062         39.062          0.000
    Tree removal      :         46.971         46.971         46.971          0.000

-- finished at 01/27/2015 21:06:43 --

多机并发测试

如下显示的2 task on 2 node

[root@lab8105 ~]#  mpirun  --allow-run-as-root -np 2 mdtest -I 10  -z 5 -b 2 -d /mnt/zptest/ -t -c 2
-- started at 01/27/2015 21:04:35 --

mdtest-1.9.3 was launched with 2 total task(s) on 2 node(s)
Command line used: mdtest -I 10 -z 5 -b 2 -d /mnt/zptest/ -t -c 2
Path: /mnt/zptest
FS: 6.5 TiB   Used FS: 59.2%   Inodes: 0.6 Mi   Used Inodes: 100.0%

2 tasks, 1260 files/directories

SUMMARY: (of 1 iterations)
    Operation                      Max            Min           Mean        Std Dev
    ---------                      ---            ---           ----        -------
    Directory creation:        312.355        312.355        312.355          0.000
    Directory stat    :       1611.000       1611.000       1611.000          0.000
    Directory removal :        127.333        127.333        127.333          0.000
    File creation     :        309.295        309.295        309.295          0.000
    File stat         :     113257.534     113257.534     113257.534          0.000
    File read         :     203458.057     203458.057     203458.057          0.000
    File removal      :         98.523         98.523         98.523          0.000
    Tree creation     :         36.566         36.566         36.566          0.000
    Tree removal      :         20.191         20.191         20.191          0.000

-- finished at 01/27/2015 21:05:12 --

关于目录生成的问题：

这个是 -z 2 -b 3

[root@lab8106 mnt]# ls mdtest2/#test-dir.0/mdtest_tree.0/
mdtest_tree.1  mdtest_tree.2  mdtest_tree.3
[root@lab8106 mnt]# ls mdtest2/#test-dir.0/mdtest_tree.0/mdtest_tree.1/
mdtest_tree.4  mdtest_tree.5  mdtest_tree.6

这个是以这个目录开始的

[root@lab8106 mnt]# ls mdtest2/#test-dir.0/mdtest_tree.0/