IOPP

git clone git://git.postgresql.org/git/~markwkm/iopp.git
cd iopp
cmake CMakeLists.txt
make

shifu:~/iopp# make install DESTDIR=/usr
[100%] Built target iopp
Install the project...
-- Install configuration: ""
-- Installing /usr/bin/iopp
-- Installing /usr/share/man/man8/iopp.8

Usage:

shifu:~/iopp# iopp -h
usage: iopp -h|--help
usage: iopp [-ci] [-k|-m] [delay [count]]
            -c, --command display full command line
            -h, --help display help
            -i, --idle hides idle processes
            -k, --kilobytes display data in kilobytes
            -m, --megabytes display data in megabytes
            -u, --human-readable display data in kilo-, mega-, or giga-bytes

The manual page explains each output field:

* pid: The process id.
* rchar: The number of bytes which this task has caused to be read from storage.
* wchar: The number of bytes which this task has caused, or shall cause to be written to disk.
* syscr: Count of the number of read I/O operations.
* syscw: Count of the number of write I/O operations.
* rbytes rkb rmb reads: Count of the number of bytes which this process really did cause to be fetched from the storage layer.
* wbytes wkb wmb writes: Count of the number of bytes which this process really did cause to be sent to the storage layer.
* cwbytes cwkb cwmb cwrites: The number of bytes which this process caused to not happen, by truncating pagecache.
* command: Filename of the executable.

IOTOP

yum install iotop

Launch:
iotop

Sysstat

yum install sysstat

[root@box ~]# iostat
Linux 2.6.27.12-170.2.5.fc10.i686 (box) 	03/17/2009

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           4.05    0.02    0.94    0.14    0.00   94.86

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda               1.35        21.15        20.95   46128992   45686368
sda1              0.01         0.15         0.00     337230        112
sda2              0.00         0.00         0.00         26          0
sda5              1.30        13.68        20.39   29837738   44474784
sda6              0.04         7.30         0.54   15918549    1166904
sda7              0.00         0.02         0.02      34443      44568

[root@box ~]#  pidstat 2 5
Linux 2.6.27.12-170.2.5.fc10.i686 (box) 	03/17/2009

04:04:47 PM       PID   %user %system    %CPU   CPU  Command
04:04:49 PM      5932    1.96    0.49    2.45     0  Xorg
04:04:49 PM     26639    0.49    0.49    0.98     0  top
04:04:49 PM     26721    0.49    1.47    1.96     0  pidstat

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