my mistake - I can see where you define the 'sequence' array - I'm
just blind - other observations stand :)
On Oct 26, 11:26 pm, hawkett <hawk...@gmail.com> wrote:
> Hi Matija,
>
> I'm not using java on app engine, but I can offer the following
>
> - the ms count on the two variations is hugely different - one is less
> than a second, and one is over 40s - if commenting out those lines
> causes such a difference, then I don't think it is inside this
> function that the problem exists.
> - I can't see where you define the 'sequence' variable, or guess how
> you use either the 'sequence' array or the 'ai' array, but my money
> would be on the processing of those arrays - after the call to the
> function is complete. e.g. commenting out those lines means those
> arrays have different content, which affects processing elsewhere.
> - guessing even more, I would say that 203 is not the correct error
> code, and that perhaps GAE exited from too much recursion, stack
> overflow, infinite loop or something like that. That should probably
> be a 500 range error code, as a 2xx range code indicates success,
> which does not seem right based on the error message.
> - My understanding is that to deal with memory leaks, GAE will kill a
> server that uses too much memory and start a new one if necessary to
> handle subsequent requests. This also makes me wonder about too much
> recursion or stack overflow etc.
> - it is strange that the request took 40s and used no cpu - this also
> makes me wonder about too much recursion - i.e. GAE never gets the
> opportunity to measure CPU before your process crashes.
>
> Anyway - some log messages in your processing would go a long way to
> identifying the real problem (assuming you are getting log message
> output before this crashes).
>
> Cheers,
>
> Colin
>
> On Oct 26, 4:42 pm, Matija <matija.jerko...@gmail.com> wrote:
>
>
>
>
>
>
>
> > I have a rather complex code for traveling salesman problem that is
> > trowing this error. I have located lines that produce this error and
> > it is pretty strange.
>
> > int[] sequence = new int[dimension];
>
> > private void reverse(int i, int j, final int ai[]) {
> > int i1 = j - i;
> > if (i1 < 0)
> > i1 += dimension;
> > i1 = i1 / 2 + 1;
> > int l, k;
> > for (l = 0; l < i1; l++) {
> > k = sequence[i];
> > sequence[i] = sequence[j];
> > ai[sequence[i]] = i;
> > // sequence[j] = k;
> > // ai[sequence[j]] = j;
> > if (++i >= dimension)
> > i -= dimension;
> > if (--j < 0)
> > j += dimension;
> > }
> > }
>
> > If I leave commented this two lines task request finishes with this
> > performance parameters (ms=842 cpu_ms=97 api_cpu_ms=0).
>
> > If I uncomment this two lines I get:
>
> > ms=40087 cpu_ms=0 api_cpu_ms=0 exit_code=203 throttle_code=1
>
> > A serious problem was encountered with the process that handled this
> > request, causing it to exit. This is likely to cause a new process to
> > be used for the next request to your application. If you see this
> > message frequently, you should contact the App Engine team. (Error
> > code 203)
>
> > Why ?!
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