[erlang-questions] Can't make dirty schedulers work on a certain VPS

Felix Gallo <>
Mon Aug 15 01:17:52 CEST 2016


If you're running on just one core, then erlang doesn't enable smp or dirty
schedulers. Could that be it?

On Aug 14, 2016 4:13 PM, "John Doe" <> wrote:

> there's neither smp no ds
> Erlang/OTP 19 [erts-8.0.3] [source] [64-bit] [async-threads:10] [hipe]
> [kernel-poll:false]
>
> 1>  erlang:system_info(dirty_cpu_schedulers).
> ** exception error: bad argument
>     in function  erlang:system_info/1
>        called as erlang:system_info(dirty_cpu_schedulers)
>
>
> 2016-08-15 2:08 GMT+03:00 Steve Vinoski <>:
>
>>
>>
>> On Sun, Aug 14, 2016 at 6:38 PM, John Doe <>
>> wrote:
>>
>>> Hi all,
>>> got a very strange problem today on a Debian 7.11, gcc 4.7.2  VPS - all
>>> apps with dirty schedulers nifs fail with  "{error, {bad_lib, xxx requires
>>> a runtime with dirty scheduler support."}}"
>>>
>>> The erlang is built by
>>> KERL_CONFIGURE_OPTIONS="--disable-dynamic-ssl-lib  --with-ssl=/usr/
>>> --enable-smp-support  --without-termcap --enable-dirty-schedulers
>>> --enable-builtin-zlib" ./kerl build git https://github.com/erlang/otp.
>>> git OTP-19.0.4 OTP-19.0.4
>>>
>>> This is not problem of the apps, all the apps fail with the same error,
>>> I tried https://github.com/vinoski/bitwise and a couple of other.
>>>
>>> There are no problems altogether with the same apps and the same OTP
>>> built with the same command on my home box. Anyway, i tried to build erlang
>>> with other flags and with no kerl, nothing changed.
>>>
>>> What could be the reason for that?
>>>
>>
>> I think the only way you can get that error message is if the runtime is
>> not actually compiled with dirty schedulers enabled. Are you sure you're
>> picking up the right runtime via your path? When you start an erlang shell,
>> does the status line include something like
>>
>>     [smp:8:8] [ds:8:8:10]
>>
>> or is the "ds" part missing? What do you get if you execute the following
>> in the erlang shell?
>>
>>     erlang:system_info(dirty_cpu_schedulers).
>>
>> --steve
>>
>
>
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