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# perf_test -s 384 -R -t4 -b 16384 -d5 -p /dev/rdsk/vtms2v1
Running with options:
threads
block_size
memory size
memory start addr
write:read ratio
random mode
duration
path
MB
Time (sec) Read BW
1
1259.292 MB/s
2
1258.271 MB/s
3
1259.717 MB/s
4
1258.863 MB/s
5
1258.300 MB/s
Average
1258.889 MB/s
HP-AM456-9002A Rev 01
•
Random reads at 4kB block size:(-R) (-b 4096)
•
Sustained random writes at 4kB block size: (-R) (-w1)(-r0) (-b 4096)
•
Random reads and writes at mix & the expected block size (given the
application and file system): (-R) (-w1)(-r1) (-b)
Each of these tests should be run using asynchronous I/O settings (-A) and a
range (-t) of thread counts (for example, 1- 64).
The baselines established using
performance issues at the operating system-layer, file system-layer, or database-
layer of the Memory Array system.
Testing Read Bandwidth
By default, the
perf_test
single thread for a repeated 4kB read of sector 0.
The following example shows a command that uses the (
(
) options to check the read bandwidth of the Memory Array.
-p
= 4
= 16384
= 393216 MB
= 0 MB
= 0:1
= 1
= 5 secs
= /dev/rdsk/vtms2v1
= 1000000 bytes
Write BW
Total BW
0.000 MB/s
1259.292 MB/s
0.000 MB/s
1258.271 MB/s
0.000 MB/s
1259.717 MB/s
0.000 MB/s
1258.863 MB/s
0.000 MB/s
1258.300 MB/s
0.000 MB/s
1258.889 MB/s
The example shows that the read bandwidth is roughly 1.2 GB/s, which is what
you might expect on a PCIe bus with the payload set to the lowest setting of 128-
bytes.
Testing Write Bandwidth
To check the write bandwidth, use the
writes to reads at 1:0. This ratio enables you to determine the random percent
of 1/Os that are writes.
VMA-series Memory Array Installation and Service Guide
Network-Layer Performance Testing
may enable you to identify
perf_test
accesses the first Memory Array device using a
Read IOPS
Write IOPS
76861
0
76798
0
76887
0
76834
0
76800
0
76836
0
and
options to define the ratio of
-w
-r
), (
), (-
), (-
), and
-s
-R
b
d
Total IOPS
76861
76798
76887
76834
76800
76836
177
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