[rabbitmq-discuss] RabbitMQ crash due to out of memory

[Chen, Bin]

Hi Matthias,

I tried your code. Erl.exe crashed.
My other tests showed that the crash happened when size was more than
2040*1024*1024, a little bit smaller than 2GB.

There was result display error when size was more than 512 MB.

When size is smaller than 512 MB, the result was displayed as 
<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
   0,...>>

We will switch to 64-bit later.

Thanks,
--Bin


-----Original Message-----
From: Matthias Radestock [mailto:matthias at rabbitmq.com] 
Sent: Wednesday, August 29, 2012 10:51 AM
To: Chen, Bin
Cc: Discussions about RabbitMQ
Subject: Re: [rabbitmq-discuss] RabbitMQ crash due to out of memory

On 29/08/12 18:24, Chen, Bin wrote:
> My system is Windows 2008 Server 64-bit which has 24 GB RAM installed.
> Erlang is a 32-bit version.

Please switch to the 64-bit version.

> Since Erlang VM has /LARGEADDRESSAWARE flag set, which implies it can 
> use up to 4 GB on a 64-bit Windows, we increased HWM to 1.6 GB.

I am not convinced that is true. Please try the following:

- in a command shell run 'erl.exe'
- at the prompt, enter
      binary:copy(<<0>>, 1024*1024*1024*3).
   (including the final '.') and hit return.

That should churn away for a few seconds and eventually print

<<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
   0,...>>

If it dies instead then Erlang cannot use 4GB.


Regards,

Matthias.