mosquitto-users team mailing list archive

[Roger Light <roger@xxxxxxxxxx>]

Hi Roy,

The Python client used to be a ctypes wrapper for libmosquitto
actually. It changed to a pure Python client in 1.0, but the wrapper
is still there in the repository history if you want to investigate.

hg clone https://bitbucket.org/oojah/mosquitto
cd mosquitto
hg up -r v0.15

Then look in lib/python/

Cheers,

Roger

On Sat, Dec 7, 2013 at 6:19 AM, Roy Barkas <roy@xxxxxxxx> wrote:
> Roger,
>
> Thanks for the useful info.
> I'll let you know whether the error does not occur in the Paho client once
> enough time has elapsed to make a definitive judgement
>
> Do you know if anyone has compiled either client using Cython?
> It doesn't seem to me that the performance / overhead of the client is a big
> concern but it would be nice to know for future reference.
>
> If I need to try to improve performance it would probably be better to write
> a python wrapper for the C library than to Cythonise the pure python version
> I'd guess..
>
> Cheers;
> Roy
>
>
> On Sat, Dec 7, 2013 at 10:03 AM, Roger Light <roger@xxxxxxxxxx> wrote:
>>
>> Hi Roy,
>>
>> Good to hear from you.
>>
>> The Paho client came directly from mosquitto.py, so there are really
>> minimal differences. I have been doing development on the mosquitto
>> side and then porting to Paho, but now that mosquitto is in the
>> process of moving to eclipse, Paho will ultimately become the
>> supported option. I'm going to do everything I can to try and make
>> sure that it's a straightforward change for people.
>>
>> I'd be very interested to hear if you don't see the broken pipe
>> problem in the Paho client because it would mean that some buggy
>> changes have been introduced to mosquitto.py. I'm assuming that you
>> were using an up to date version of course.
>>
>> Cheers,
>>
>> Roger
>>
>> On Fri, Dec 6, 2013 at 10:32 PM, Roy Barkas <roy@xxxxxxxx> wrote:
>> > I've been using the Python client provided by the Mosquitto project in
>> > production.
>> > My environment is Linux and I'm processing ~ 12,000,000 messages per
>> > day.
>> >
>> > I've been chasing some intermittent broken pipe (32)  exceptions using
>> > the
>> > Mosquitto client without much luck, so I recently decided to swap in the
>> > Paho Python client and see if the same errors occur.  So far the broken
>> > pipe
>> > error has not recurred but it's early days - sometimes the error only
>> > occurs
>> > once in a few hours, sometimes more frequently.
>> >
>> > The Paho code seems to work well.
>> >
>> > Before I get too invested in changing to the Paho client...
>> >
>> > Are there any advantages / disadvantages for either of the clients?
>> >
>> > Are there any significant implementation differences?
>> >
>> > Are there any notable performance differences?  So far I haven't seen
>> > any
>> > significant differences in CPU utilisation.
>> >
>> > Thanks;
>> >
>> > Roy Barkas
>> > Australia
>> >
>> > --
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>
>