diff options
| -rw-r--r-- | README | 1 | ||||
| -rw-r--r-- | mbw.c | 9 |
2 files changed, 7 insertions, 3 deletions
@@ -1,6 +1,7 @@ MBW determines the "copy" memory bandwidth available to userspace programs. Its simplistic approach models that of real applications. It is not tuned to extremes and it is not aware of hardware architecture, just like your average software package. 2006, 2012 Andras.Horvath atnospam gmail.com +2013 j.m.slocum atnospam gmail.com http://github.com/raas/mbw @@ -27,6 +27,8 @@ * MBW memory bandwidth benchmark * * 2006, 2012 Andras.Horvath@gmail.com + * 2013 j.m.slocum@gmail.com + * (Special thanks to Stephen Pasich) * * http://github.com/raas/mbw * @@ -97,6 +99,7 @@ double worker(unsigned long long asize, long *a, long *b, int type, unsigned lon unsigned int long_size=sizeof(long); /* array size in bytes */ unsigned long long array_bytes=asize*long_size; + unsigned int advance=block_size/long_size; if(type==1) { /* memcpy test */ /* timer starts */ @@ -106,11 +109,11 @@ double worker(unsigned long long asize, long *a, long *b, int type, unsigned lon gettimeofday(&endtime, NULL); } else if(type==2) { /* memcpy block test */ gettimeofday(&starttime, NULL); - for(t=0; t<array_bytes; t+=block_size) { + for (t=array_bytes; t >= block_size; t-=block_size, a+=advance){ b=mempcpy(b, a, block_size); } - if(t>array_bytes) { - b=mempcpy(b, a, t-array_bytes); + if(t) { + b=mempcpy(b, a, t); } gettimeofday(&endtime, NULL); } else { /* dumb test */ |