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iozone benchmark doc. You may use one or more of the following keywords [iozone msword pdf ozone] to. IOzone. IOzone is a file system benchmark utility. Originally made by William Norcott, SCO OpenServer, Solaris, Mac OS X, Windows (95/98/Me/NT/2K/XP). I wrote this book using Microsoft Word 98 for the Macintosh. Hence, the screen shots, menus, etc. might look a little different if you are using a different version or .

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This guarantees that the buffer cache does not contain any of the file under test. This test measures the performance of reading and writing a file with ilzone being made to random locations within the file.

What is “iozone”

Another example is when the filesystem is mounted from a remote machine. Byte offset, size of transfer, compute delay in milliseconds. This nsword measures the performance of reading an existing file. This test measures the performance of reading a file that was recently read. Additional notes on how to make the graphs Iozone sends Excel compatible output to standard out.

If the system would have been characterized before it was purchased it would never have made it into the building. This option allows the user to specify how many threads or processes to have active during the measurement. This is used internally to help speed up the test.

This saves quite a bit of time.


Not all platforms scale so well. This will purge the processor cache and allow one to see the memory subsystem without the acceleration due to the processor cache. The next plateau to the right is buffer cache and finally above MB msowrd file no longer fits in the buffer cache and real spindle speeds can be seen. See —y for setting minimum record size. See —q for setting maximum record size. For example if your system has 1 Gbyte of memory then you would want to try something like: Don Capps wnorcott us.


This is useful only if you suspect that close is broken in the operating system currently under test. Although interesting to see, it is unlikely that you will be able to get applications to never write files that are mswor than the processor cache However it might be possible to get applications to try to re-use buffers and keep the buffer size smaller than the processor cache size.

The place on the lower right that touches the floor of the graph is not actual data. This test measures the performance of reading a file backwards.

What does iozone mean – Definition of iozone – Word finder

Many vendors have enhanced their operating systems to perform well for some frequently used applications. Excel importable output for graph generation. One lozone also specify -q k size in Kbytes or -q m size in Mbytes or -q g size in Gbytes.

If the poor system administrator ever installs an application that likes to read or write files in a record size of Kbytes to 1 Mbyte his users will probably take him out back for a conference. The simplest way to get started is to try the automatic mode. This may be needed if the client is running NFS version 3. Only available on some platforms.

File size fits in processor cache. Each line has three fields.

This tells Iozone the size of the processor cache. The load may now shift from a random reader application database to a sequential reader. See also -X and -Y for other options to control compute delay.


Notice the ridge that runs from the top left to the lower right down the center of the graph. Iozone will default to a maximum file size msworr Mbytes. If you don’t see at least 3 plateaus then you probably have the maximum file size set too small.

One might consider using it before your company purchases its next platform. A sign in column zero is a comment line.

Notice the performance dip at record sizes of Kbytes. Also note that the processor cache effects can be seen for file sizes of 16 Kbytes to 1Mbyte. During the throughput tests all threads or processes are forced to a barrier before beginning the test. mmsword

An example would be if the file size is just a bit bigger than the buffer cache size. When running throughput tests this iozonf allows the user to specify the greatest number of processes or threads to start.

This ensures that the entire measurement was taken while all of the processes or threads were running in parallel. As time rolls on the system administrator may decide that a few more office automation tasks could be shifted to this machine.

This is because the writes are going into the buffer cache and the application is allowed to continue immediately. It is not possible to unmount the current working directory as the process Iozone is running in this directory.