perflab added
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302
perflab/poly/poly_test.c
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302
perflab/poly/poly_test.c
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/* Test setup for polynomial evaluation. Do not change this. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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//#include <random.h>
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#include "poly.h"
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#include "cpe.h"
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#include "clock.h"
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double CPU_Mhz;
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/* Degree for fixed evaluation */
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#define FIXDEGREE 10
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/* Largest degree polynomial tested */
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#define MAXDEGREE 2000
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static int coeff[MAXDEGREE+1];
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#define MAX_ITER_COUNT 100
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#define REF_CPU_MHZ 2292.6 // 这是我的处理器主频
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/* Define performance standards */
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static struct {
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double cref; /* Cycles taken by reference solution */
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double cbest; /* Cycles taken by our best implementation */
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} cstandard[3] =
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{{4.00, 1.75}, /* CPE */
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{50, 43}, /* C(10) */
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{57,31} /* 常系数多项式计算 */
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};
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int coeff_const[4];
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/* Should I print extra information? */
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int verbose = 0;
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/* Standard value for polynomial evaluation */
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static int xval;
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/* How many degrees should I compute reference value for? */
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#define DCNT 20
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/* Correct value of polynomial evaluation for range of different degrees */
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/* pval[i] contains evaluation for degree MAXDEGREE-i */
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static int pval[DCNT];
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/* fixval contains evaluation for degree FIXDEGREE */
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static int fixval;
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static int fixval_const;
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static void init_const_poly(void);
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static void init(void);
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extern int const_poly_eval(int *not_use, int not_use2, int x);
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void run_fun_const(int degree);
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static double compute_score(double cmeas, double cref, double cbest);
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unsigned long rand1_h,rand1_l,rand_div;
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void rand_step(unsigned long divv);
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void GenerateRandomNumber(unsigned long divv);
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extern void make_CPU_busy(void);
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double run_poly_perf_test(void);
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/* Reference implementation */
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static int ref_poly_eval(int *a, int degree, int x)
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{
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int result = 0;
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int i;
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int xpwr = 1; /* Successive powers of x */
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for (i = 0; i <= degree; i++) {
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result += a[i]*xpwr;
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xpwr *= x;
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}
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return result;
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}
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/* Initialize polynomial to constant values and compute reference values */
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static void init_const_poly(void)
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{
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int i;
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for (i=0;i<4;i++)
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{
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GenerateRandomNumber(90);
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coeff_const[i] = rand_div+10;
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}
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printf("你需要修改poly.c的const_poly_eval函数，实现下面的常数多项式计算！\n");
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printf("\tresult=%d+%d*x+%d*x^2+%d*x^3\n",coeff_const[0],coeff_const[1],coeff_const[2],coeff_const[3]);
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fixval_const = ref_poly_eval(coeff_const, 3, xval);
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// printf("x=%d, fixval_const=%d\n",xval,fixval_const);
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}
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void test_const_poly(void)
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{
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int i;
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double fix_time=0;
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int my_cal = const_poly_eval(coeff_const, 3, xval);
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if (fixval_const != my_cal)
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{
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printf("常系数多项式计算const_poly_eval实现错误（x=%d），预期结果是%d，但是计算得到的是%d\n",xval,fixval_const,my_cal);
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exit(0);
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}
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fix_time = 0;
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for (i=0;i<MAX_ITER_COUNT;i++)
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fix_time += measure_function(run_fun_const, 3);
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fix_time = fix_time / MAX_ITER_COUNT;
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printf(" 常系数多项式计算时间 = %.1f\n", fix_time);
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printf(" 最高的常系数多项式计算得分 ============== %.0f\n",
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compute_score(fix_time, cstandard[2].cref, cstandard[2].cbest));
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}
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/* Initialize polynomial to random values and compute reference values */
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static void init(void)
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{
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int i;
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xval = rand();
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for (i = 0; i <= MAXDEGREE; i++)
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coeff[i] = rand();
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for (i = 0; i < DCNT; i++)
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pval[i] = ref_poly_eval(coeff, MAXDEGREE-i, xval);
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fixval = ref_poly_eval(coeff, FIXDEGREE, xval);
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}
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/* Test function on standard test cases. */
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int test_poly(peval_fun f, FILE *rpt) {
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int i;
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int v;
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int ok = 1;
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for (i = 0; i < DCNT; i++) {
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v = f(coeff, MAXDEGREE-i, xval);
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if (v != pval[i]) {
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ok = 0;
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if (rpt) {
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fprintf(rpt,
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"错误！多项式计算不对！阶=%d时，计算的值是%d，而正确值是%d\n",
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MAXDEGREE-i, v, pval[i]);
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}
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}
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}
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v = f(coeff, FIXDEGREE, xval);
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if (v != fixval) {
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ok = 0;
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if (rpt) {
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fprintf(rpt,
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"错误！多项式计算不对！阶=%d时，计算的值是%d，而正确值是%d\n",
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FIXDEGREE, v, fixval);
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}
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}
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return ok;
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}
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/* Fit into framework of cpe measuring code */
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static peval_fun pfun;
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volatile int sink;
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/* Run pfun for given degree */
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void run_fun(int degree)
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{
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sink = pfun(coeff, degree, xval);
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}
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volatile int sink_const;
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/* Run pfun for given degree */
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void run_fun_const(int degree)
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{
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sink_const = const_poly_eval(coeff_const, degree, xval);
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}
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/* Test and measure polynomial evaluation function. Set values
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of CPE and CFIX */
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void run_poly(peval_fun f, char *descr, double *cpep, double *cfixp)
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{
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int i;
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double cpe=0;
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double fix_time=0;
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pfun = f;
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printf("函数：%s\n", descr);
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if (test_poly(f, stdout)) {
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cpe = 0;
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for (i=0;i<MAX_ITER_COUNT;i++)
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cpe += find_cpe(run_fun, MAXDEGREE);
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cpe = cpe/MAX_ITER_COUNT;
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fix_time = 0;
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for (i=0;i<MAX_ITER_COUNT;i++)
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fix_time += measure_function(run_fun, FIXDEGREE);
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fix_time = fix_time/MAX_ITER_COUNT;
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printf(" CPE = %.2f\tC(%d) = %.1f\n", cpe,
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FIXDEGREE, fix_time);
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if (cpep)
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*cpep = cpe;
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if (cfixp)
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*cfixp = fix_time;
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}
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}
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/* Compute the grade achieved by function */
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static double compute_score(double cmeas, double cref, double cbest)
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{
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double sbest = cref/cbest;
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double smeas = cref/cmeas;
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if (smeas < 0.1*(sbest-1)+1)
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return 0;
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if (smeas > 1.1*(sbest-1)+1)
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return 120;
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return 100*((smeas-1.0)/(sbest-1.0) + 0.1);
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}
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/* 产生一个0~divv-1之间的随机数，同时更新随机数种子 */
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void GenerateRandomNumber(unsigned long divv)
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{
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unsigned long long x = rand1_h;
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x *= 0x6AC690C5;
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x += rand1_l;
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rand1_h = (unsigned long)x;
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rand1_l = (unsigned long)(x>>32);
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if (divv==0) return;
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rand_div = rand1_h % divv;
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}
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int main(int argc, char *argv[])
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{
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int i;
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double cpe = cstandard[0].cref;
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double cfix = cstandard[1].cref;
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verbose = 0;
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srand((unsigned int)time(NULL));
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// CPU_Factor();
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// GetCpuClock();
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printf("\t2015多项式优化实验，欢迎你！\n");
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printf("============================\n");
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if (argc == 1)
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{
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printf("使用方法：%s 学号后6位 [学号后6位] [学号后6位] ...\n",argv[0]);
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printf("你需要依据提示改写poly.c程序，实现一个常系数多项式的计算，尽可能快哦....\n");
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printf("另外，你需要改写poly.c程序，实现任意阶的多项式计算和10阶的多项式计算，要快！\n");
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return 0;
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}
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/*依据学号，初始化一个随机数发生器*/
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rand1_h = (unsigned long)atoi(argv[1]);
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rand1_l=0x29A;
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GenerateRandomNumber(0);
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for (i=2;i<argc;i++)
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{
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rand1_l = (unsigned long)atoi(argv[i]);
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GenerateRandomNumber(0);
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}
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GenerateRandomNumber(50);
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//srand(rand_div);
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//make_CPU_busy();
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//CPU_Mhz=mhz(1);
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init();
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init_const_poly();
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printf("============================\n");
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//make_CPU_busy();
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//run_poly_perf_test();
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test_const_poly();
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for (i = 0; peval_fun_tab[i].f != NULL; i++) {
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//make_CPU_busy();
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run_poly(peval_fun_tab[i].f, peval_fun_tab[i].descr, &cpe, &cfix);
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if (i == 0)
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printf(" 最高的CPE得分 =========================== %.0f\n",
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compute_score(cpe, cstandard[0].cref, cstandard[0].cbest));
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if (i == 1)
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printf(" 最高的C(10)得分 ========================= %.0f\n",
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compute_score(cfix, cstandard[1].cref, cstandard[1].cbest));
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}
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return 0;
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}
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int poly_eval_perf_test(int *a, int degree, int x)
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{
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int result = 0;
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int i;
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int xpwr = 1; /* Successive powers of x */
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for (i = 0; i <= degree; i++) {
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result += a[i] * xpwr;
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xpwr *= x;
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}
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return result;
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}
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double run_poly_perf_test(void)
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{
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int i;
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double fix_time=0;
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pfun = poly_eval_perf_test;
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for (i=0;i<MAX_ITER_COUNT;i++)
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fix_time += measure_function(run_fun, FIXDEGREE);
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fix_time = fix_time/MAX_ITER_COUNT;
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printf("fix_time=%f\n",fix_time);
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return fix_time;
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}
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