On 12 Oct 2009, at 8:44 AM, Igor Peshansky wrote:
> Jim LaGrone <jlagr...@cs.uh.edu> wrote on 10/09/2009 06:16:40 PM:
>
>> I receiving the following message during execution with the C++
>> backend, but not Java backend. Any help would be appreciated...
>>
>> GC Warning: Repeated allocation of very large block (appr. size
>> 282624):
>> May lead to memory leak and poor performance.
>
> Jim,
>
> This is a message from the GC library that we use for the C++
> backend. It may be a legitimate warning, in that the code is
> actually doing a large allocation in a loop. The JVM will not
> warn you about something like this, but it doesn't mean it is
> not happening there.
>
> Check your loops to see if you are creating a large object
> (e.g., a Rail/ValRail). If you are, consider hoisting the
> allocation out of the loop. It would help to see the loop
> that does the allocation, so that we are talking about the
> same things.
> Igor
Here is the loop:
finish ateach ( (j,i): Point in region ){
var real: Double = 0;
var imag: Double = 0;
for( var k:Int = 0; k < ny; k++ ){
val l = (j*k)%ny;
real = real + p(k,i).real*cos_value(l) + p(k,i).imag*sin_value(l);
imag = imag + p(k,i).imag*cos_value(l) - p(k,i).real*sin_value(l);
}
temp_p(j,i) = new Complex (real,imag );
}
I receive the GC warning on CentOS running in VMWare Fusion on a
Macbook Pro. I do not get the warning on a cluster using mpiexec to
begin execution.
Jim
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