[erlang-questions] Erl getting stuck in SMP with 8 cores

Eranga Udesh <>
Thu Sep 4 11:16:53 CEST 2008


Thanks heap all for giving me inputs and your experiences to identify the
issue. Unfortunately there has been a HP Firmware upgrade they released,
which we haven't applied and once applied, the problem dissapeared. All the
indications and system behaviours were confusing and pointing somewhere else
and made it difficult to understand the root cause.

Cheers,
- Eranga




On Tue, Sep 2, 2008 at 12:27 AM, Sargun Dhillon <> wrote:

> This sounds almost like a hardware/kernel issue. I've run erlang on
> 8-CPU machines (32 & 64) without any "thread jamming." I was using
> yaws & my own erlang code, both of which use recursive functions. The
> difference was that I was running it under a fairly optimized Gentoo
> system, and not CentOS. If you enable core dumps, do you get anything
> from beam? When it locks up try SIGSEVC and get a core dump to
> analyze. You can try (l/s)trace also in order to find system calls
> which can be crashing on your box.
>
>
> On Mon, Sep 1, 2008 at 10:09 AM, Kostis Sagonas <> wrote:
> > Eranga Udesh wrote:
> >> Good to know that Erl works successfully wh 8 or more intel cores. Do
> >> you use 8 schedulers with threads/hipe enabled?
> >
> > I've routinely used Erlang with SMP & HiPE (in fact running native code)
> > with both 8 and 16 x86_64 cores for more than 6 months now without any
> > problems.  No threads enabled though.
> >
> > The 'application' is running the native code compiler & dialyzer in
> > parallel with as many schedulers as cores in the machine.
> >
> > Kostis
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