[erlang-questions] 回复： ERL_MAX_PORTS has no effect

[Tony Rogvall]

Hi!

Setting the ulimit works nicely with files, but not so nice with sockets.
You wont notice until the driver start using driver_select and thereby, indirectly, using
the system call select. 
I suspected that "erl +K true", enable kernel poll (kqueue for max os x),  should do the trick. But, not.
There is still a check for max_fds that triggers somewhere which is unfortunate.

This is on R15, have not checked R16 yet.

Rickard Green may now more about the status on max_fds ?

Regards

/Tony


On 13 jul 2013, at 15:04, goofansu <goofan.su@REDACTED> wrote:

> Hi, Anthony
> 
> Thank you for the explanation.
> 
> I tested on the VPS again and set `ulimit -n` to a number like 4096 takes effects.
> 
> I'm running Riak so cannot upgrade to R16B01 now.
> 
> 
> Kind Regards,
> 
> --
> goofansu
> 
> 
> -- 
> Kind Regards
> goofansu
> 
> 在 2013年7月13日星期六，下午8:08，Anthony Ramine 写道：
> 
>> Hello,
>> 
>> ERL_MAX_PORTS sets the maximum number of running ports. Not the maximum number of file descriptors.
>> 
>> I guess you are running OS X which has a broken poll implementation and Erlang is forced to use select(), which is limited to FD_SETSIZE file descriptors. Fortunately, OS X's select() implementation can also be made to support an infinite number of file descriptors through a macro which I taught Erlang/OTP to use. Upgrade to R16B01 and you should be fine.
>> 
>> Regards,
>> 
>> --
>> Anthony Ramine
>> 
>> Le 13 juil. 2013 à 08:34, goofansu a écrit :
>> 
>>> I encounted "fd=1024 is larger than the largest allowed fd=1023", then I set the ERL_MAX_PORTS variable when start the erlang vm. But it takes no effect.
>>> 
>>> $ erl -env ERL_MAX_PORTS 4096
>>> 
>>> Erlang R15B01 (erts-5.9.1) [source] [64-bit] [smp:4:4] [async-threads:0] [kernel-poll:false]
>>> 
>>> Eshell V5.9.1 (abort with ^G)
>>> 1> erlang:system_info(check_io).
>>> [{name,erts_poll},
>>> {primary,select},
>>> {fallback,false},
>>> {kernel_poll,false},
>>> {memory_size,6344},
>>> {total_poll_set_size,2},
>>> {lazy_updates,true},
>>> {pending_updates,0},
>>> {batch_updates,false},
>>> {concurrent_updates,false},
>>> {max_fds,1024}]
>>> 2>
>>> 
>>> The max_fds is always 1024.
>>> 
>>> --
>>> Kind Regards
>>> goofansu
>>> 
>>> _______________________________________________
>>> erlang-questions mailing list
>>> erlang-questions@REDACTED
>>> http://erlang.org/mailman/listinfo/erlang-questions
> 
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