[Bioclusters] (no subject)

[Dan Bolser]

Cool!

I get...

Allocated 3083946496 bytes
That's 2941.08 MB.

From my desktop (Mem:1030956k av, Swap:5116692k av)

Allocated 3083945984 bytes
That's 2941.08 MB.

From my xeon (Mem:4124724k av, Swap:2040244k av)

Hmmmm.....

What does it mean?

:)

Thanks,
Dan.

On Tue, 30 Mar 2004, Aaron Darling wrote:

> >
> > 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";
> }
> 
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