[Bioclusters] (no subject)

[Aaron Darling]

>
> Can anyone suggest a smarter testing program (using malloc for
> example) which can better probe the per process limit?
>
> I will give it a google...
>

Here's a little c++ code I wrote a while back to do exactly that.  Give
it a minute or two and it will have allocated up to the per-process limit.
Unsure whether it's necessary for your purposes, but it touches each page
to make sure they're actually allocated.

#include <iostream>
using namespace std;

int main( void ){
        char* buf;
        unsigned long long size = 1024 * 1024 * 512;
        unsigned long long total_allocation = 0;
        string junk;
        for( int i = 0;; i++ ){
                if( size < 512 )
                        break;
                try{
                        buf = new char[ size ];
                }catch( exception& e ){
                        cerr << "Alloc failed, new size is: " << size / 2 << endl;
                        cerr << "total_alloc is: " << total_allocation << endl;
                        size /= 2;
                        continue;
                }
                total_allocation += size;
                for( unsigned bufI = 0; bufI < size; bufI+= 512 )
                        buf[ bufI ] = 0xAA;
        }
        cerr << "Allocated " << total_allocation << " bytes\n";
        cerr << "That's " << (double)total_allocation / (double)(1024 * 1024) << " MB.\n";
}