Hello,
I am trying to test the default code for "Performing File I/O on the Coprocessor" at the end of Chapter 7 in Intel Xeon-Phi Coprocessor High Performance Programming by Jim Jefferies and James Reinders.
The code is as follows:
#pragma offload_attribute(push,target(mic))
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#pragma offload_attribute(pop)
int main()
{
FILE *fp;
char buffer[7];
#pragma offload target(mic) nocopy(fp)
{
fp =fopen("./proxyfs/myfile.txt","wb");
if(fp==NULL)
{
fprintf(stderr,"Failed to open myfile.txt for write\n");
exit(1);
}
fwrite("Hello\n",1,7,fp);
fclose(fp);
}
#pragma offload target(mic) nocopy(fp) out(buffer)
{
fp = fopen("./proxyfs/myfile.txt","rb");
if(fp==NULL)
{
fprintf(stderr,"Failed to open myfile.txt for read\n");
exit(1);
}
fread(buffer, 1, 7, fp);
fclose(fp);
if(strcmp(buffer, "Hello\n") != 0)
{
fprintf(stderr,"File incorrectly read back on coproc\n");
exit(1);
}
}
printf("%s", buffer);
return 0;
}
I set MIC_PROXY_FS_ROOT to a relevant location and set MIC_PROXY_IO = 1, just as stated in the book. However, when I run the code, I get the first error:
"Failed to open myfile.txt for write"
which means that the proxyfs directory is invalid.
Was the software changed so this method doesn't work anymore? Or is there something wrong with the code?
Thanks.
