[Live-devel] my performance benchmark of livemedia library, not satisfactory

[Brad Bitterman]

I found that under Linux a single threaded process such as one using  
live555 only runs on one core of a multi-core CPU. My suggestion is to  
run multiple processes if possible. This will let Linux distribute the  
processes to the different cores.

- Brad

On Mar 11, 2009, at 6:31 AM, Marco Amadori wrote:

> On Wednesday 11 March 2009, 10:28:25, liu yang wrote:
>
>> I plan to develop an application which may support 500+ or even 1000+
>> rtp session simultaneously. So anybody could tell me whether  
>> livemedia
>> could support such load?
>> BTW, I did some test based on testWAV sample program. The result is
>> not satisfactory, frankly speaking.
>
> On a bigger machine (dual xeon) with 6 raid5 15K SAS disks streaming  
> 4mbits
> MPEG2 ts I found that I could not stream more than 95 streams without
> artifacts on screen.
>
> My bold analisys (on a early 2008 release of livemedia) was that the  
> problem
> wasn't IO bound but CPU bound (95%+). Also the network (400Mbps)  
> wasn't
> problematic since we had tried both a single gigabit and a bonding  
> of 4
> interfaces sawing both server and router side very little load.
>
> But I just did a quick analisys, so I could be enterely wrong or  
> misleaded.
>
>> FAQ told me livemedia is a single threaded framework, which all  
>> logics
>> are processed in single thread sequentially.
>
> This could be a problem (a known one) in our case since multiple  
> Xeon cores
> and CPUs was not used. Launching another session of  
> live555MediaServer helper
> in adding another 95 streams to our tests.. so this could be a hint  
> for
> looking for optimization interventions. Do some profiling and if some
> computation effort is really needed, parallelize the code as  
> possible in
> order to use multiples cores/CPUs.
>
>> So do you have any insightful thoughts of where we can optimize to
>> enhance livemeida as a high-performance rtp streaming stack which
>> could undergo heavy load.
>
> This is of real interest to me too.
>
> -- 
> ESC:wq
>
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