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Chapter 10 - Performance Tuning and Troubleshooting
# 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
block_size
memory size
memory start addr
write:read ratio
random mode
duration
path
MB
no-cache mode
AIO depth
Time(sec)Read BW Write BWTotal BWRead IOPSWrite IOPSTotal IOPS
1
817.181 MB/s0.000 MB/s817.181 MB/s1995070199507
174
Performance Testing Using perf_test
The
utility is a lightweight tool for measuring the I/O performance
perf_test
of storage devices.
The
utility was specifically designed to push the I/O device as hard
perf_test
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
test the performance of a direct-attached Memory Array system:
•
Running the perf_test Utility
•
Baselining the Memory Array System
•
Testing Read Bandwidth
•
Testing Write Bandwidth
Running the perf_test Utility
For best results, use the (
using multiple threads (
For example, the command
following example when run on a Linux host:
= 8
= 4096
= 640 GB
= 0x0
= 0:1
= 1
= 0 secs
= /dev/vtms-strad
= 1000000 bytes
= 1
= 64
VMA-series Memory Array Installation and Service Guide
utility and shows how it may be used to
perf_test
on page 174
on page 176
on page 177
on page 177
option to randomly access a specific range (
-R)
), direct I/Os (
), and asynchronous I/Os (
-t
-o
perf_test -s 640 -R -A64 -t8 -o
)
-s
).
-A
returns the
HP-AM456-9002A Rev 01
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