I have a large program written in C++ and executed from Perl using Inline::CPP. The code seems to be using a lot of memory, so I am assuming there is a leak somehow. I have written the following code that reproduces the same issue, but is much simpler. I found the leak when I looped the code 1,000,000 times to test the performance of the code. This simple Perl script uses 828MiB, and my full program uses 1.3GiB.
I have tried a lot of things, like using SvREFCNT_dec, newRV_noinc, sv_free, and sv_2mortal on various variables in the code, but I haven't been able to bring the memory usage down.
Here's my example code:
use Data::Dumper;
print Dumper test ();
use Inline 'CPP' => << 'CPP';
#include <array>
using namespace std;
AV *array_to_av (const array<int,3> &v)
{
AV *array = newAV ();
for (int i : v) {
av_push (array, newSViv (i));
}
return array;
}
SV *test_leak ()
{
HV *hash = newHV ();
AV *array1 = array_to_av ({1,2,3});
AV *array2 = array_to_av ({1,2,3});
AV *array3 = array_to_av ({1,2,3});
SV *value1 = newRV_noinc ((SV *)(array1));
SV *value2 = newRV_noinc ((SV *)(array2));
SV *value3 = newRV_noinc ((SV *)(array3));
hv_stores (hash, "Test1", value1);
hv_stores (hash, "Test2", value2);
hv_stores (hash, "Test3", value3);
return newRV_noinc ((SV *)(hash));
}
SV *test ()
{
SV *hash;
for (int i = 0; i < 1000000; i++) {
hash = test_leak ();
}
return hash;
}
CPP
sleep 10;
You need to free up the hashes that are not returned to the Perl script in the for loop. This loop:
for (int i = 0; i < 1000000; i++) {
hash = test_leak ();
}
Should be something like:
for (int i = 0; i < 1000000; i++) {
hash = test_leak ();
SvREFCNT_dec(hash); // Free the memory not returned to Perl
}
hash = test_leak(); // The final hashref is returned to Perl
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