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Network-Layer Performance Testing
HP-AM456-9002A Rev 01
VMA-series Memory Array Installation and Service Guide
175
The following table describes the options used in this command. For a complete
list of
perf_test
For best results, take the following factors into consideration when running the
perf_test
utility.
Memory Access Patterns
The
perf_test
memory access modes include random, sequential, and single-
address. Accessing just a single address can radically impact the performance
a device can deliver, as can sequential and random access. So, know which
address access mode is being used when running tests.
Threading and Asynchronous I/O
Use
perf_test
to specify the number of threads to spawn and the number of
outstanding I/Os within each request.
The Linux operating system tends to deal with larger asynchronous I/O depths
better than a larger number of threads. High amounts of I/O can be achieved by
understanding the operating system behavior and using a combination of thread
counts and asynchronous I/O.
2
817.132 MB/s0.000 MB/s817.132 MB/s1994950199495
3
817.160 MB/s0.000 MB/s817.160 MB/s1995010199501
4
817.096 MB/s0.000 MB/s817.096 MB/s1994860199486
-s memory-size
Specifies the system memory size, in GB (if no
units are provided). Recognized unit/size
qualifiers include:
k
,
K
,
m
,
M
,
g
and
G
for the
appropriate binary multipliers.
-t num-threads
Specifies the number of threads to invoke. Each
thread is governed by the options specified for
reads, writes, verification, block size, and so on,
and operates independently in terms of
randomness of addresses touched.
-R
Selects addresses to read/write randomly.
-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.
-A async-io-depth
Specifies the number of I/Os to generate using
the operating system’s asynchronous I/O API.
Содержание VMA Series
Страница 4: ...4 VMA series Memory Array Installation and Service Guide HP AM456 9002A Rev 01 ...
Страница 21: ...PART I Product Overview Chapter 1 VMA series Overview Chapter 2 Violin Intelligent Memory Modules ...
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Страница 38: ......
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Страница 180: ...Appendix A Product Models 180 VMA series Memory Array Installation and Service Guide HP AM456 9002A Rev 01 ...
Страница 186: ...Appendix B Compliance Information 186 VMA series Memory Array Installation and Service Guide HP AM456 9002A Rev 01 ...
Страница 208: ...Appendix C Alarm Reference 208 VMA series Memory Array Installation and Service Guide HP AM456 9002A Rev 01 ...
Страница 300: ...Appendix D CLI Reference 300 VMA series Memory Array Installation and Service Guide HP AM456 9002A Rev 01 ...