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Violin Utilities Reference

HP-AM456-9002A Rev 01

VMA-series Memory Array Installation and Service Guide

165

Example

By default, the

perf_test accesses the first Memory Array device using a

single thread for a repeated 4kB read of sector 0. For best results, use the

-R

option to randomly access a specific range (

-s) using multiple threads (-t),

direct I/Os (

-o), and asynchronous I/Os (-A).

-A async-io-depth

Specifies the number of I/Os to generate using the

operating system’s asynchronous I/O API.

On Linux, this option is only available if the

libaio

and

libaio-devel packages were installed with

the Violin Utilities installation. Specify less threads

using the

-t option for Windows and Linux drivers

and specify more asynchronous I/Os using the

-A

option, as it reduces CPU context switching.

-a address

Specifies the address, in hex, where read/write

operations occur or start. Useful with the

-C option

for sequential reads and writes.

-c char

Specifies a character, in hex, to write when

performing write operations. Example:

0xCA.

-V

Verifies writes with a read to ensure data integrity.

This option can have a significant impact on overall

I/O throughput.

-I

Ignores errors on read/write operations to the

device.

-R

Selects addresses to read/write randomly.

-C

Selects addresses to read/write incrementing by

the block size specified.

-q

Specifies quiet mode. Prints a summary of

information only just before exiting and not every

second. This option is useful when using

perf_test

in a scripted environment.

-z

Specifies print timestamps as real time instead of

number of seconds elapsed since the start of the

test.

-L

Specifies latency mode.

-u

Prints detailed system utilization statistics.

-o

Informs perf_test to bypass the buffer cache by

using the

O_DIRECT flag when opening a

connection to the device-path. This option applies to

block devices only and not character devices.

Table 9.2 perf_test Utility Options (Continued)

Option Description

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 299 300

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