[Libwebsockets] Problem of multiple persistent WebSocket connections

Zhang, Luis (Thin Client R&D) xiaolu.zhang at hp.com
Tue Sep 19 09:32:08 CEST 2017


Attached is the log file.

There are a lot of TIMEDOUT messages likes below. I modified the timeout from 5 seconds to 15 seconds, the issue occurred too.

[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd624162660: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)
[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd624142bb0: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)
[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd624142900: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)
[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd624142650: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)
[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd6241303a0: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)
[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd6241300f0: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)
[2017/09/19 15:16:22:0048] NOTICE: wsi 0x7fd62412fe40: TIMEDOUT WAITING on 3 (did hdr 0, ah (nil), wl 611, pfd events 0)

Best Regards,
Luis


-----Original Message-----
From: Libwebsockets [mailto:libwebsockets-bounces at ml.libwebsockets.org] On Behalf Of Zhang, Luis (Thin Client R&D)
Sent: Monday, September 18, 2017 9:47
To: Andy Green <andy at warmcat.com>; libwebsockets at ml.libwebsockets.org
Subject: Re: [Libwebsockets] Problem of multiple persistent WebSocket connections

I will reproduce it and get more detailed logs later.

Best Regards,
Luis


-----Original Message-----
From: Andy Green [mailto:andy at warmcat.com] 
Sent: Monday, September 18, 2017 9:33
To: Zhang, Luis (Thin Client R&D) <xiaolu.zhang at hp.com>; libwebsockets at ml.libwebsockets.org
Subject: RE: [Libwebsockets] Problem of multiple persistent WebSocket connections



On September 18, 2017 9:12:35 AM GMT+08:00, "Zhang, Luis (Thin Client R&D)" <xiaolu.zhang at hp.com> wrote:
>Thanks.
>
>The platform is Debian 8.5 and I used libuv.

OK... so what happens when it seems to go wrong?

Can you reproduce this with the libuv test server?  Can you let me know how to reproduce?

LWS_WITH_STATS is on master, it logs a bunch of interesting stats every 10s.

-Andy

>Best Regards,
>Luis
>
>
>-----Original Message-----
>From: Andy Green [mailto:andy at warmcat.com]
>Sent: Monday, September 18, 2017 9:11
>To: Zhang, Luis (Thin Client R&D) <xiaolu.zhang at hp.com>; 
>libwebsockets at ml.libwebsockets.org
>Subject: Re: [Libwebsockets] Problem of multiple persistent WebSocket 
>connections
>
>
>
>On 09/18/2017 09:07 AM, Andy Green wrote:
>> 
>> 
>> On 09/18/2017 08:51 AM, Zhang, Luis (Thin Client R&D) wrote:
>>> I'm working on developing a WebSocket Server that supports for 
>>> multiple persistent WebSocket connections. Our goal is supporting
>for
>>> 100K connections concurrently. As mentioned in 
>>> https://libwebsockets.org/ that per thread can support 250K 
>>> connections. So I think that there is no problem for supporting 100K
>
>>> persistent WebSocket connections. And I verified it with v2.0.0, it 
>>> works well.
>>>
>>> But, when I upgraded the libwebsockets lib to v2.1, the server
>cannot
>>> accepted so many connections. It only can accepted about 40K 
>>> connections. When about 40K connections were established, I cannot 
>>> establish websocket connection any more. I also test it with v2.2
>and
>>> v2.3, I got the same result.
>>>
>>> The test environment of all test case are same, just the version of 
>>> libwesocket lib are different.
>> 
>>   - what is the platform?
>> 
>>   - what *exactly* happens when you "cannot establish websocket 
>> connection any more"?  Logs?
>
>... and...
>
>  - what event loop?  Default, using libuv / ev / event?
>
>> 
>> There's no intention to reduce the max clients the server can serve, 
>> on the contrary...
>> 
>> -Andy
>> 
>>> Any thoughts? Thank you.
>>>
>>> Best Regards,
>>>
>>> Luis
>>>
>>>
>>>
>>> _______________________________________________
>>> Libwebsockets mailing list
>>> Libwebsockets at ml.libwebsockets.org
>>> https://libwebsockets.org/mailman/listinfo/libwebsockets
>>>
>> _______________________________________________
>> Libwebsockets mailing list
>> Libwebsockets at ml.libwebsockets.org
>> https://libwebsockets.org/mailman/listinfo/libwebsockets
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