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| Guest |
 Posted: Wed Jul 07, 2010 11:28 am |
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Guest
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While try to do a quick check on which floats need to be rounded before
trunking them to get valid results, I was able to crash the Erlang VM. I find
it a bit strange as it happened rather quickly into something that I thought
shouldn't be that intensive. I have tried this twice, and was wondering if
this could be pointing to something else as a problem.
Machine Info
daniel@greyowl:~/sdb/work/gf_olympus/troy/trunk/tmp> uname -a
Linux greyowl 2.6.31.12-0.2-default #1 SMP 2010-03-16 21:25:39 +0100 x86_64
x86_64 x86_64 GNU/Linux
daniel@greyowl:~/sdb/work/gf_olympus/troy/trunk/tmp> erl --version
Erlang R14A (erts-5. [source] [64-bit] [smp:2:2] [rq:2] [async-threads:0]
[hipe] [kernel-poll:false]
============== CODE START
-module(itest).
-export([do/0]).
do() ->
do(0.0).
do(100.0) ->
done;
do(Value) ->
if trunc(Value * 100) =:= trunc(round(Value * 100)) ->
do(Value + 0.01);
true ->
error_logger:info_msg("Value: ~p~n", [Value]),
do(Value + 0.01)
end.
============== CODE END
The final result. (After 280 iterations of the function the following crash)
=INFO REPORT==== 7-Jul-2010::11:33:07 ===
Value: 2.7999999999999843
Crash dump was written to: erl_crash.dump
eheap_alloc: Cannot allocate 20672 bytes of memory (of type "heap").
Aborted
The code is attached
I am a bit at a loss as to where to start troubleshooting this 
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| Guest |
| Posted: Wed Jul 07, 2010 12:12 pm |
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Guest
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The error_logger can't consume the info messages you send at the rate
that that tight loop produces them.
erl_crash.dump:
<0.5.0> error_logger Garbing (limited info) 27440736 182452560 7557980
Regards,
Bj |
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| Guest |
| Posted: Wed Jul 07, 2010 12:16 pm |
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Guest
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| Guest |
| Posted: Wed Jul 07, 2010 12:53 pm |
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Guest
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And this of course spins out of control because
do(100.0) -> done;
never matches exactly.
do(N) when N >= 100.0 -> done;
should put an end to the madness.
/Sverker
Bj |
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