[erlang-questions] Slow UTP packets

Ovidiu Deac <>
Thu Jul 30 16:02:33 CEST 2009


Thanks. For the info.

On Thu, Jul 30, 2009 at 4:54 PM, Bengt
Kleberg<> wrote:
> Greetings,
>
> To format beore writing taker a look at io_lib:format/2
> (http://erlang.org/doc/man/io_lib.html). It handles formatting like
> io:fwrite/2, but returns an iolist instead of writing to an IO object.
>
>
> bengt
>
> On Thu, 2009-07-30 at 16:23 +0300, Ovidiu Deac wrote:
>> Thanks!
>>
>> 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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>>
>
>
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