client.run hangs when client.duration over 130 seconds

[nick0333]

Anyone know if there is any fix or workaround on this (other than running in a loop heh)?

I am encountering same issue on rhel7 and Ubuntu 16.04. When i use iperf3 module with python3 it hangs for interval > 130...

When I run iperf3 tool itself command line it works just fine with long test duration.

Details below. Any insight appreciated, thanks! :)

(iperf3env) # python3
Python 3.6.8 (default, Jun 11 2019, 15:15:01)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux
Type "help", "copyright", "credits" or "license" for more information.

import iperf3
client = iperf3.Client()
client.duration = 10
client.server_hostname = '10.0.0.2'
client.bandwidth = 50000000
result = client.run()
result.sent_Mbps
49.561612938104
del client
client = iperf3.Client()
client.duration = 131
client.server_hostname = '10.0.0.2'
client.bandwidth = 50000000
result = client.run()
^CTraceback (most recent call last):
File "", line 1, in
File "/home/nick/iperf3env/lib/python3.6/site-packages/iperf3/iperf3.py", line 616, in run
error = self.lib.iperf_run_client(self._test)
KeyboardInterrupt
quit()
(iperf3env) #

(iperf3env) # iperf3 -c 10.0.0.2 -b 50000000 -t 180
Connecting to host 10.0.0.2, port 5201
[ 4] local 10.0.0.1 port 38590 connected to 10.0.0.2 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 5.46 MBytes 45.8 Mbits/sec 29 417 KBytes
[ 4] 1.00-2.00 sec 5.88 MBytes 49.3 Mbits/sec 0 427 KBytes
[ 4] 2.00-3.00 sec 6.00 MBytes 50.3 Mbits/sec 0 436 KBytes
...
[ 4] 177.00-178.00 sec 6.00 MBytes 50.3 Mbits/sec 0 622 KBytes
[ 4] 178.00-179.00 sec 5.88 MBytes 49.3 Mbits/sec 0 625 KBytes
[ 4] 179.00-180.00 sec 6.00 MBytes 50.3 Mbits/sec 0 625 KBytes

[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-180.00 sec 1.05 GBytes 50.0 Mbits/sec 82 sender
[ 4] 0.00-180.00 sec 1.05 GBytes 50.0 Mbits/sec receiver

iperf Done.
(iperf3env) #

[Oposum01]

@nick0333 have you found a workaround meanwhile? I've got the same problem, but actually only 30 seconds test duration is working for me, when using 4 parallel streams.

[qarlosalberto]

I have the same problem, any solution?

[hccresende]

I also have the same problem. Does anyone have a solution?

[Shaun-3adesign]

seeing same issue here.

tested with iperf 3.1.3 and 3.9 and 3.14

this call just never returns error = self.lib.iperf_run_client(self._test)

seen issues with 120 and above thou 3.1.3 did seem to work with 131 but all fail with 300

testing with iperf directly works as expected

[AngelobRSA]

I ended up just using iperf with subprocess , hacky but it worked .

[Shaun-3adesign]

@AngelobRSA I did the same thing initially but had some issues.

I've now done more digging and it fails trying to write the response to the output which I believe is pointed at stdout, the is in libiperf itself.

I have managed to get this wrapper working, thou I have had to modify it.

so I added the setter for log_file and set a log file before running the test, currently I've tested 10, 120, 300, 100 and 7200 seconds all appear to work fine.

I'll look at doing a pull request.

I've raised an issue with iperf esnet/iperf#1648