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HP-AM456-9002A Rev 01
Table 9.2 perf_test Utility Options (Continued)
Option
-A async-io-depth
-a address
-c char
-V
-I
-R
-C
-q
-z
-L
-u
-o
Example
By default, the
perf_test
single thread for a repeated 4kB read of sector 0. For best results, use the
option to randomly access a specific range (
direct I/Os (
), and asynchronous I/Os (
-o
VMA-series Memory Array Installation and Service Guide
Description
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
and
packages were installed with
libaio-devel
the Violin Utilities installation. Specify less threads
using the
option for Windows and Linux drivers
-t
and specify more asynchronous I/Os using the
option, as it reduces CPU context switching.
Specifies the address, in hex, where read/write
operations occur or start. Useful with the
for sequential reads and writes.
Specifies a character, in hex, to write when
performing write operations. Example:
Verifies writes with a read to ensure data integrity.
This option can have a significant impact on overall
I/O throughput.
Ignores errors on read/write operations to the
device.
Selects addresses to read/write randomly.
Selects addresses to read/write incrementing by
the block size specified.
Specifies quiet mode. Prints a summary of
information only just before exiting and not every
second. This option is useful when using
in a scripted environment.
Specifies print timestamps as real time instead of
number of seconds elapsed since the start of the
test.
Specifies latency mode.
Prints detailed system utilization statistics.
Informs
to bypass the buffer cache by
perf_test
using the
flag when opening a
O_DIRECT
connection to the device-path. This option applies to
block devices only and not character devices.
accesses the first Memory Array device using a
) using multiple threads (
-s
).
-A
Violin Utilities Reference
libaio
-A
option
-C
.
0xCA
perf_test
-R
),
-t
165
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