[erlang-questions] is anyone else experiencing reliability issues with R15?

Ali Sabil <>
Thu Sep 20 08:43:31 CEST 2012


We have experienced similar issues with R15B01 where the I/O will get
completely blocked, but we haven't really been able to track it down,
the suspect we had was the usage of sendfile.

On Thu, Sep 20, 2012 at 3:02 AM, Fred Hebert <> wrote:
> We've had problems in R15B01 with particular statistics functions related to
> schedulers, as described in
> http://erlang.org/pipermail/erlang-bugs/2012-July/002964.html
>
> To date there is no solution and we just stopped using these functions,
> going back to run queues.
>
> We also have seen a non-negligible increase in CPU usage from R14B*
> versions, easily around 20% or so during regular workload, although it
> didn't seem to affect heavy overload situations too negatively for us (no
> precise measurements were made for this, just casual observations). It
> remained high no matter what arguments we gave to the VM.
>
> We have noticed nodes getting locked-up in R15B01 from time to time when
> memory on the server is getting rare, taken by other applications -- it
> seemed we had a lot of contention on proc_tab mutexes, but nothing came out
> of it. We eventually reduced memory usage in other applications and things
> have been rather stable since then.
>
> Other than that, everything appeared normal, and none of the blocking
> incidents could be directly attributed to issues you appear to have. We
> haven't seen memory ballooning except in occasional error logger cases, but
> most of our processes are extremely short-lived (well under <150ms).
>
> On 12-09-19 4:11 PM, Rapsey wrote:
>
> We run a network of custom built streaming servers doing video streaming and
> transcoding of IPTV channels.
> On R14 everything runs great. But switching to R15, gen_servers inexplicably
> block and don't respond to messages, even the console blocks and does not
> respond to input for 30s or so, processes baloon taking up large amounts of
> memory for no reason. All at random times, but gets much worse once there
> are more users connected to the server doing a lot of req/s or receiving a
> lot of data.
> We're running ubuntu server and start erlang with these switches:
> erl +Bd +S 4 +P 1000000 -env ERL_MAX_PORTS 100000 +K true +A 32
>
> Are we alone having problems with R15? We tried R15B01 and R15B02.
>
>
>
> Sergej
>
>
> _______________________________________________
> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
>
>
>
> _______________________________________________
> erlang-questions mailing list
> 
> http://erlang.org/mailman/listinfo/erlang-questions
>



More information about the erlang-questions mailing list