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Chapter 10 - Performance Tuning and Troubleshooting
174
VMA-series Memory Array Installation and Service Guide
HP-AM456-9002A Rev 01
Performance Testing Using perf_test
The
perf_test
utility is a lightweight tool for measuring the I/O performance
of storage devices.
The
perf_test
utility was specifically designed to push the I/O device as hard
as possible using a variety of methods including POSIX threads, variable block
sizing, asynchronous I/O, direct communication, as well as sequential and
random read/ write operations to data over a user-defined address range.
This section describes the
perf_test
utility and shows how it may be used to
test the performance of a direct-attached Memory Array system:
•
•
Baselining the Memory Array System
•
•
Running the perf_test Utility
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
).
For example, the command
perf_test -s 640 -R -A64 -t8 -o
returns the
following example when run on a Linux host:
# perf_test -s 640 -R -A64 -t8 -o
Violin Memory, Inc.
Version: vtms-linux-utils-D4.5.4, 05/23/2011
Command: perf_test -s 640 -R -A64 -t8 -o
Running with options:
threads = 8
block_size = 4096
memory size = 640 GB
memory start addr = 0x0
write:read ratio = 0:1
random mode = 1
duration = 0 secs
path = /dev/vtms-strad
MB = 1000000 bytes
no-cache mode = 1
AIO depth = 64
Time(sec)Read BW Write BWTotal BWRead IOPSWrite IOPSTotal IOPS
1
817.181 MB/s0.000 MB/s817.181 MB/s1995070199507
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 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 ...