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[mininet-discuss] Ping and CPU utilization

Bob Lantz rlantz at cs.stanford.edu
Thu May 10 17:04:01 PDT 2012


you could try something like: 

print h1.cmd( 'ping -c10', h2.IP() )

On May 10, 2012, at 4:49 PM, James Hongyi Zeng wrote:

> I would like to try that. But how can I run ping in a loop without CLI?
> 
> On Thu, May 10, 2012 at 4:44 PM, Bob Lantz <rlantz at cs.stanford.edu> wrote:
> Thanks James - I believe there is an error in CLI.waitForNode(), which should (only) be registering for POLLIN.
> 
> Can you confirm that it still happens if you *don't* use the CLI?
> 
> -Bob
> 
> On May 10, 2012, at 3:27 PM, James Hongyi Zeng wrote:
> 
>> "mn" or any Python script that uses Mininet API.
>> 
>> On Thu, May 10, 2012 at 3:22 PM, Brandon Heller <brandonh at stanford.edu> wrote:
>> What does top show is taking up the CPU?
>> 
>> -b
>> 
>> On Thu, May 10, 2012 at 3:16 PM, James Hongyi Zeng <hyzeng at stanford.edu> wrote:
>> Hi,
>> 
>>     I found that a simple ping in Mininet will consume 100% of one CPU core (even when not successful). Specifically, I do something like
>> 
>> sudo mn --controller=none
>> mininet> h1 ping h2
>> 
>>     And the CPU utilization in top shows 100%. I tried different switch+controller combinations and it's the same. Any idea on what's going on here?
>> 
>>     I am currently on CS244 branch.
>> 
>> Thanks,
>> James
>> 
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>> 
>> 
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> 

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