IO meter:Subsystem Measurement and Characterization Tool

Jul 14, 2010 by Shivendu Madhava

IO meter evaluates the performance of the I/O subsystem and acts as a characterisation tool for single and clustered systems. It was originally developed by Intel; now, Intel has discontinued to work on IOmeter, and it is being maintained by the Open Source Development Lab (OSDL).

IOmeter consists of two programs, IOmeter and Dynamo.

1. IOmeter is the controlling program. It has a GUI and it tells Dynamo what to do, collects the resulting data, and summarises the results in output files. Only one instance of IOmeter should be running at a time, and therefore, it is typically run on the server machine.

2. Dynamo is the workload generator. It has no user interface. At IOmeter’s command, Dynamo performs I/O operations and records performance information, then returns the data toIOmeter. There can be more than one copy of Dynamo running at a time. Typically, one copy runs on the server machine, and oneadditional copy runs on each client machine.

Installing IOmeter

After downloading the package, uncompress the files, and place the files IOmeter.exe and Dynamo.exe in the same directory. If you want to run Dynamo on multiple machines, Dynamo.exe must be available on each machine (on either a local or networked disk).

In such cases, a properly-configured TCP/IP network must be provided between the systems on which IOmeter and Dynamo are to be run. No network is needed if IOmeter and Dynamo are run on a single system.

Running IOmeter

To run IOmeter, double-click on IOmeter.exe. The GUI appears, and IOmeter starts one copy of Dynamo on the same machine. IOMeter undertakes tests to assess:

1. Disk performance

2. Network performance between two computers (A and B)

The interface

It provides a tabbed interface to control the various parameters of the test. The different tabs to control the parameters of the test:

1. Disk Targets tab: Specifies the disks used by each disk worker.

2. Network Targets tab: Specifies the network interfaces used by each network worker.

3. Access Specifications tab: Specifies the type of I/O operation each worker performs to its targets.

4. Results Display tab: Displays performance data during the test.

5. Test Setup tab: Specifies the tests to be performed in a test series.

The IOMeter Web site is very informative, and well-designed to assist the user.

Site:http://www.iometer.org

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