diff options
| -rw-r--r-- | src/Run.cpp | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/src/Run.cpp b/src/Run.cpp index 24435b4..9cfdfc1 100644 --- a/src/Run.cpp +++ b/src/Run.cpp @@ -104,6 +104,22 @@ int Run::run() { } } + // Calculate the amount of NOP's to hit the requested processing cycles + // TODO: this shouldn't be dynamically counted in the chase_pointers + // method, but rather compiled dynamically? + int64 nops = (this->exp->busy_cycles - 1) / 7; + // Assembler for loop + // initialize counter -- 1 initialization instruction + // nop -\ + // add one to counter | + // move counter to register | + // compare register to upper limit | 7 instuctions per iteration + // set compare byte if still less | + // test the compare byte | + // jump depending on the test output -/ + if (nops < 0) + nops = 0; + if (this->exp->iterations <= 0) { volatile static double istart = 0; volatile static double istop = 0; @@ -122,7 +138,7 @@ int Run::run() { // chase pointers run_benchmark(this->exp->chains_per_thread, iters, root, this->exp->bytes_per_line, this->exp->bytes_per_chain, - this->exp->stride, this->exp->busy_cycles, + this->exp->stride, nops, this->exp->prefetch); // barrier @@ -163,7 +179,7 @@ int Run::run() { // chase pointers run_benchmark(this->exp->chains_per_thread, this->exp->iterations, root, this->exp->bytes_per_line, this->exp->bytes_per_chain, - this->exp->stride, this->exp->busy_cycles, this->exp->prefetch); + this->exp->stride, nops, this->exp->prefetch); // barrier this->bp->barrier(); @@ -214,7 +230,7 @@ static double min(double v1, double v2) { return v1; } -// exclude 2 and mersienne primes, i.e., +// exclude 2 and Mersenne primes, i.e., // primes of the form 2**n - 1, e.g., // 3, 7, 31, 127 static const int prime_table[] = { 5, 11, 13, 17, 19, 23, 37, 41, 43, 47, 53, @@ -366,8 +382,10 @@ static void chase_pointers(int64 chains_per_thread, // memory loading per thread a = a->next; if (prefetch) prefetch(a->next); + asm("nop"); for (int64 j = 0; j < busy_cycles; j++) asm("nop"); + asm("nop"); } mem_chk(a); } |