[erlang-questions] Slow UTP packets

Ovidiu Deac <>
Thu Jul 30 15:23:45 CEST 2009


Indeed switching to file:write fixed the problem.

But what is the explanation for the fact that the output slows during
runtime? Is it a bug?

Still I would like to write text files where the lines are formatted
using ~p style. How can I do that fast?

On Thu, Jul 30, 2009 at 3:58 PM, Rob Elsner<> wrote:
> I am doing nearly an identical thing and record a 35Mbps multicast UDP
> stream (~4MB/s) just fine.  The difference is I don't use io:write, I
> use file:write.  I've had the file in raw mode and that works as well.
>  I also use delayed_write, but in either case it works fine.
> I think you might be hitting an issue using io:write.  Is there a
> chance you can use file:write and see how that performs?
> Rob
> On Thu, Jul 30, 2009 at 6:29 AM, Ovidiu Deac<> wrote:
>> Hi everybody,
>> I want to do some speed tests for parsing packets and I wrote a small
>> program which receives data on a multicast address and writes it to a
>> file. While this application is running I measure the growing speed of
>> the output file to get an idea about the speed.

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