1 | /* Stress test for Xen Store: multiple people hammering transactions */ |
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2 | #include "xs.h" |
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3 | #include "utils.h" |
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4 | #include <stdlib.h> |
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5 | #include <stdio.h> |
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6 | #include <sys/types.h> |
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7 | #include <sys/wait.h> |
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8 | #include <sys/stat.h> |
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9 | #include <fcntl.h> |
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10 | #include <unistd.h> |
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11 | #include <errno.h> |
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12 | |
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13 | #define NUM_HANDLES 2 |
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14 | #define DIR_FANOUT 3 |
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15 | #define DIR_DEPTH 3 |
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16 | |
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17 | /* How often to print progress */ |
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18 | static int print; |
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19 | |
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20 | /* Layout looks like /<num>/<num>/count. */ |
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21 | static void work(unsigned int cycles, unsigned int childnum) |
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22 | { |
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23 | unsigned int i; |
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24 | struct xs_handle *handles[NUM_HANDLES]; |
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25 | char id; |
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26 | |
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27 | if (childnum < 10) |
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28 | id = '0' + childnum; |
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29 | else |
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30 | id = 'A' + childnum - 10; |
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31 | |
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32 | for (i = 0; i < NUM_HANDLES; i++) { |
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33 | handles[i] = xs_daemon_open(); |
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34 | if (!handles[i]) |
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35 | barf_perror("Opening handle %i", i); |
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36 | } |
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37 | |
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38 | srandom(childnum); |
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39 | for (i = 0; i < cycles; i++) { |
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40 | unsigned int j, len; |
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41 | char file[100] = ""; |
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42 | char *contents, tmp[100]; |
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43 | struct xs_handle *h = handles[random() % NUM_HANDLES]; |
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44 | |
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45 | for (j = 0; j < DIR_DEPTH; j++) |
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46 | sprintf(file + strlen(file), "/%li", |
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47 | random()%DIR_FANOUT); |
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48 | |
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49 | if (!xs_transaction_start(h)) |
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50 | barf_perror("%i: starting transaction %i", |
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51 | childnum, i); |
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52 | |
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53 | sprintf(file + strlen(file), "/count"); |
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54 | contents = xs_read(h, file, &len); |
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55 | if (!contents) |
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56 | barf_perror("%i: can't read %s iter %i", |
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57 | childnum, file, i); |
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58 | sprintf(tmp, "%i", atoi(contents) + 1); |
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59 | if (!xs_write(h, file, tmp, strlen(tmp)+1)) |
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60 | barf_perror("%i: can't write %s iter %i", |
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61 | childnum, file, i); |
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62 | |
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63 | /* Abandon 1 in 10 */ |
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64 | if (random() % 10 == 0) { |
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65 | if (!xs_transaction_end(h, true)) |
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66 | barf_perror("%i: can't abort transact", |
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67 | childnum); |
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68 | i--; |
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69 | } else { |
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70 | if (!xs_transaction_end(h, false)) { |
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71 | if (errno == EAGAIN) { |
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72 | write(STDOUT_FILENO, "!", 1); |
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73 | i--; |
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74 | } else |
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75 | barf_perror("%i: can't commit trans", |
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76 | childnum); |
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77 | } else { |
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78 | /* Offset when we print . so kids don't all |
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79 | * print at once. */ |
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80 | if ((i + print/(childnum+1)) % print == 0) |
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81 | write(STDOUT_FILENO, &id, 1); |
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82 | } |
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83 | } |
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84 | } |
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85 | } |
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86 | |
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87 | static void create_dirs(struct xs_handle *h, const char *base, int togo) |
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88 | { |
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89 | unsigned int i; |
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90 | char filename[100]; |
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91 | |
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92 | if (togo == 0) { |
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93 | sprintf(filename, "%s/count", base); |
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94 | if (!xs_write(h, filename, "0", 1)) |
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95 | barf_perror("Writing to %s", filename); |
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96 | return; |
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97 | } |
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98 | |
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99 | for (i = 0; i < DIR_FANOUT; i++) { |
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100 | sprintf(filename, "%s/%i", base, i); |
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101 | if (!xs_mkdir(h, filename)) |
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102 | barf_perror("xs_mkdir %s", filename); |
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103 | create_dirs(h, filename, togo-1); |
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104 | } |
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105 | } |
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106 | |
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107 | static unsigned int add_count(struct xs_handle *h, const char *base, int togo) |
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108 | { |
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109 | unsigned int i, count; |
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110 | char filename[100]; |
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111 | |
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112 | if (togo == 0) { |
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113 | char *answer; |
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114 | unsigned int len; |
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115 | |
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116 | sprintf(filename, "%s/count", base); |
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117 | answer = xs_read(h, filename, &len); |
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118 | if (!answer) |
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119 | barf_perror("Reading %s", filename); |
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120 | count = atoi(answer); |
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121 | free(answer); |
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122 | return count; |
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123 | } |
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124 | |
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125 | count = 0; |
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126 | for (i = 0; i < DIR_FANOUT; i++) { |
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127 | sprintf(filename, "%s/%i", base, i); |
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128 | count += add_count(h, filename, togo-1); |
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129 | } |
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130 | return count; |
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131 | } |
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132 | |
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133 | static void setup(void) |
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134 | { |
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135 | struct xs_handle *h; |
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136 | |
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137 | /* Do setup. */ |
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138 | h = xs_daemon_open(); |
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139 | if (!h) |
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140 | barf_perror("Contacting daemon"); |
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141 | create_dirs(h, "", DIR_DEPTH); |
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142 | xs_daemon_close(h); |
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143 | } |
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144 | |
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145 | static unsigned int tally_counts(void) |
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146 | { |
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147 | struct xs_handle *h; |
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148 | unsigned int ret; |
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149 | |
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150 | h = xs_daemon_open(); |
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151 | if (!h) |
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152 | barf_perror("Contacting daemon"); |
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153 | |
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154 | ret = add_count(h, "", DIR_DEPTH); |
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155 | xs_daemon_close(h); |
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156 | return ret; |
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157 | } |
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158 | |
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159 | int main(int argc, char *argv[]) |
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160 | { |
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161 | unsigned int i; |
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162 | bool failed = false; |
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163 | int kids[10]; |
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164 | |
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165 | if (argc != 2) |
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166 | barf("Usage: xs_stress <iterations>"); |
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167 | |
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168 | printf("Setting up directories...\n"); |
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169 | setup(); |
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170 | |
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171 | print = atoi(argv[1]) / 76; |
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172 | if (!print) |
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173 | print = 1; |
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174 | |
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175 | printf("Running %i children...\n", ARRAY_SIZE(kids)); |
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176 | for (i = 0; i < ARRAY_SIZE(kids); i++) { |
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177 | kids[i] = fork(); |
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178 | if (kids[i] == -1) |
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179 | barf_perror("fork"); |
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180 | if (kids[i] == 0) { |
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181 | work(atoi(argv[1]) / ARRAY_SIZE(kids), i); |
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182 | exit(0); |
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183 | } |
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184 | } |
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185 | |
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186 | for (i = 0; i < ARRAY_SIZE(kids); i++) { |
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187 | int status; |
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188 | if (waitpid(kids[i], &status, 0) == -1) |
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189 | barf_perror("waitpid"); |
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190 | if (!WIFEXITED(status)) |
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191 | barf("Kid %i died via signal %i\n", |
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192 | i, WTERMSIG(status)); |
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193 | if (WEXITSTATUS(status) != 0) { |
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194 | printf("Child %i exited %i\n", i, WEXITSTATUS(status)); |
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195 | failed = true; |
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196 | } |
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197 | } |
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198 | if (failed) |
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199 | exit(1); |
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200 | |
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201 | printf("\nCounting results...\n"); |
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202 | i = tally_counts(); |
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203 | if (i != (unsigned)atoi(argv[1])) |
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204 | barf("Total counts %i not %s", i, argv[1]); |
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205 | printf("Success!\n"); |
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206 | exit(0); |
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207 | } |
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