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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.

1 2 ... 152 153 154 155 156 157 158 159 160 161 162 ... 361 362

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Hp StorageWorks Scalable File Share Manuel d'utilisateur Page 157

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