topic short int or char in viRngUniform in Intel® oneAPI Math Kernel Library

short int or char in viRngUniform

dario_suarez — Thu, 04 Feb 2010 11:05:32 GMT

Hello,

I'm usign large array of very small random numbers, often between 0 and 10. This large arrays consume 4 bytes per entry (int), and I would like to know if there is a way for generating arrays of short int and chars to save memory.

Thanks in advance for your help,

Daro

short int or char in viRngUniform

Sergey_M_Intel2 — Thu, 04 Feb 2010 11:39:15 GMT

Hello Dario,

Unfortunately there is no 8-bit or 16-bit variant of the uniform RNG in MKL. The only workaround that I see is to generate the data by portions as 32-bit integers and process those integers in a way you need. It will save the storage.

If for some reason youneed to store entire array of chars you still can generate it by blocks by converting each block into array of bytes, something like this:

#define N (1024*1000)

#define BLOCK_SIZE 1024

int block[BLOCK_SIZE];

char urng;

... //Create the random stream

for (i=0; i

{

// Generate block of 32-bit integers

viRndUniform(0, stream, BLOCK_SIZE, block, 0, 10);

for (j=0; j

{

urng[i+j] = (char)block;

}

... // Delete the random stream

That may help,

Regards,

Sergey

short int or char in viRngUniform

dario_suarez — Thu, 04 Feb 2010 16:18:12 GMT

Hi Sergey,

Thanks. The idea of blocking seems very good. I'll implement it and see the effect on memory and performance.

Best regards,

Daro