ceph/src/isa-l/erasure_code/gf_vect_dot_prod_1tbl.c

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  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>             // for memset, memcmp
  33 #include "test.h"
  34 #include "erasure_code.h"
  35
  36 //#define CACHED_TEST
  37 #ifdef CACHED_TEST
  38 // Cached test, loop many times over small dataset
  39 # define TEST_SOURCES 10
  40 # define TEST_LEN     8*1024
  41 # define TEST_LOOPS   4000
  42 # define TEST_TYPE_STR "_warm"
  43 #else
  44 # ifndef TEST_CUSTOM
  45 // Uncached test.  Pull from large mem base.
  46 #  define TEST_SOURCES 10
  47 #  define GT_L3_CACHE  32*1024*1024     /* some number > last level cache */
  48 #  define TEST_LEN     GT_L3_CACHE / TEST_SOURCES
  49 #  define TEST_LOOPS   10
  50 #  define TEST_TYPE_STR "_cold"
  51 # else
  52 #  define TEST_TYPE_STR "_cus"
  53 #  ifndef TEST_LOOPS
  54 #    define TEST_LOOPS 1000
  55 #  endif
  56 # endif
  57 #endif
  58
  59 typedef unsigned char u8;
  60
  61 // Global GF(256) tables
  62 u8 gff[256];
  63 u8 gflog[256];
  64 u8 gf_mul_table[256 * 256];
  65
  66 void mk_gf_field(void)
  67 {
  68         int i;
  69         u8 s = 1;
  70         gflog[0] = 0;
  71
  72         for (i = 0; i < 256; i++) {
  73                 gff[i] = s;
  74                 gflog[s] = i;
  75                 s = (s << 1) ^ ((s & 0x80) ? 0x1d : 0); // mult by GF{2}
  76         }
  77 }
  78
  79 void mk_gf_mul_table(u8 * table)
  80 {
  81         // Populate a single table with all multiply combinations for a fast,
  82         // single-table lookup of GF(2^8) multiply at the expense of memory.
  83         int i, j;
  84         for (i = 0; i < 256; i++)
  85                 for (j = 0; j < 256; j++)
  86                         table[i * 256 + j] = gf_mul(i, j);
  87 }
  88
  89 void gf_vect_dot_prod_ref(int len, int vlen, u8 * v, u8 ** src, u8 * dest)
  90 {
  91         int i, j;
  92         u8 s;
  93         for (i = 0; i < len; i++) {
  94                 s = 0;
  95                 for (j = 0; j < vlen; j++)
  96                         s ^= gf_mul(src[j][i], v[j]);
  97
  98                 dest[i] = s;
  99         }
 100 }
 101
 102 int main(void)
 103 {
 104         int i, j, k;
 105         u8 s, vec[TEST_SOURCES], dest1[TEST_LEN], dest2[TEST_LEN];
 106         u8 *matrix[TEST_SOURCES];
 107         struct perf start, stop;
 108
 109         mk_gf_field();
 110         mk_gf_mul_table(gf_mul_table);
 111
 112         //generate random vector and matrix/data
 113         for (i = 0; i < TEST_SOURCES; i++) {
 114                 vec[i] = rand();
 115
 116                 if (!(matrix[i] = malloc(TEST_LEN))) {
 117                         fprintf(stderr, "Error failure\n\n");
 118                         return -1;
 119                 }
 120                 for (j = 0; j < TEST_LEN; j++)
 121                         matrix[i][j] = rand();
 122
 123         }
 124
 125         gf_vect_dot_prod_ref(TEST_LEN, TEST_SOURCES, vec, matrix, dest1);
 126
 127         perf_start(&start);
 128         for (i = 0; i < TEST_LOOPS; i++)
 129                 gf_vect_dot_prod_ref(TEST_LEN, TEST_SOURCES, vec, matrix, dest1);
 130
 131         perf_stop(&stop);
 132         printf("gf_vect_dot_prod_2tbl" TEST_TYPE_STR ": ");
 133         perf_print(stop, start, (long long)TEST_LEN * (TEST_SOURCES + 1) * i);
 134
 135         // Warm up mult tables
 136         for (i = 0; i < TEST_LEN; i++) {
 137                 s = 0;
 138                 for (j = 0; j < TEST_SOURCES; j++) {
 139                         s ^= gf_mul_table[vec[j] * 256 + matrix[j][i]];
 140                 }
 141                 dest2[i] = s;
 142         }
 143
 144         perf_start(&start);
 145         for (k = 0; k < TEST_LOOPS; k++) {
 146                 for (i = 0; i < TEST_LEN; i++) {
 147                         s = 0;
 148                         for (j = 0; j < TEST_SOURCES; j++) {
 149                                 s ^= gf_mul_table[vec[j] * 256 + matrix[j][i]];
 150                         }
 151                         dest2[i] = s;
 152                 }
 153         }
 154         perf_stop(&stop);
 155         printf("gf_vect_dot_prod_1tbl" TEST_TYPE_STR ": ");
 156         perf_print(stop, start, (long long)TEST_LEN * (TEST_SOURCES + 1) * k);
 157
 158         // Compare with reference function
 159         if (0 != memcmp(dest1, dest2, TEST_LEN)) {
 160                 printf("Error, different results!\n\n");
 161                 return -1;
 162         }
 163
 164         printf("Pass functional test\n");
 165         return 0;
 166 }