HP StorageWorks Scalable File Share - Manual (Page 157)

Verifying the system 6–27
6.1.8.2.3 Testing Myrinet interconnect performance using the gm_allsize command
You can use the
gm_allsize
tool as an alternative to the
net_test.bash
command described in
Section 6.1.8.2.2. If you have already performed the tests in Section 6.1.8.2.2, you do not need to perform
the tests in this section.
You can use the
gm_allsize
tool as a basic connectivity test that operates in loopback mode. You can
also use the
gm_allsize
command to measure interconnect one-way latency and bandwidth. (For a list
of all
gm_allsize
command options, enter
gm_allsize --help
at the command prompt.)
Latency test
Perform this test by entering the
gm_allsize
command on two servers, defining the server that is to be
tested as the master and the other server as the slave.
On the server that is to be the slave server, specify the
--slave
option when you invoke the
gm_allsize
command. In the following example,
south1
is the slave server:
# ssh south1
# /opt/gm/bin/gm_allsize --slave
On the server that is to be tested (the master server), specify the
--remote-host=slave_server
option
when you invoke the
gm_allsize
command. For example, if the server that is to be tested is
south3
, use
the following commands:
# ssh south3
# /opt/gm/bin/gm_allsize --remote-host=south1.my.domain.com
You can also specify the
--verify
option to force the verification of the contents of all messages; however,
this option significantly degrades the performance of the test. You can obtain the host names by using the
gm_board_info
program, as described Section 6.1.8.2.1.
The following example shows typical output from the
gm_allsize
command displayed at the master server
(
south3
in this example):
# Opening board 0 port 2. Sending to port 2.
# Not verifying contents of messages.
Remote GM node id south1 (3).
# Reliable Point-To-Point Half-Round-Trip Latency (usec)
# size 12
# ./gm_allsize --remote-host=south1
# (reporting half round trip time)
1 7.23
2 8.11
3 7.60
4 7.23
5 7.34
6 7.24
7 7.87
8 7.48
9 7.23
10 8.00
11 7.36
12 7.48
13 8.00
14 7.23
15 7.74
16 7.86
17 7.61
18 7.36
19 7.49
20 8.12
21 7.36
22 7.36
23 6.98
To stop the process, press
Ctrl/c
on the master server and on the slave server.