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Specify # of threads.

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This commit is contained in:
Syoyo Fujita
2016-05-15 16:08:16 +09:00
parent 654e686079
commit 566d259df2
1 changed files with 16 additions and 4 deletions
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20
experimental/optimized-parse.cc
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@@ -491,7 +491,13 @@ static bool tryParseDouble(const char *s, const char *s_end, double *result) {
end_not_reached = (curr != s_end); end_not_reached = (curr != s_end);
while (end_not_reached && IS_DIGIT(*curr)) { while (end_not_reached && IS_DIGIT(*curr)) {
// NOTE: Don't use powf here, it will absolutely murder precision. // NOTE: Don't use powf here, it will absolutely murder precision.
mantissa += static_cast<int>(*curr - 0x30) * pow(10.0, -read);
// pow(10.0, -read)
double frac_value = 10.0;
for (int f = 0; f < read; f++) {
frac_value *= 0.1;
}
mantissa += static_cast<int>(*curr - 0x30) * frac_value;
read++; read++;
curr++; curr++;
end_not_reached = (curr != s_end); end_not_reached = (curr != s_end);
@@ -820,12 +826,13 @@ typedef struct
#define kMaxThreads (32) #define kMaxThreads (32)
void parse(const char* buf, size_t len) void parse(const char* buf, size_t len, int req_num_threads)
{ {
std::vector<char> newline_marker(len, 0); std::vector<char> newline_marker(len, 0);
auto num_threads = std::max(1, std::min(static_cast<int>(std::thread::hardware_concurrency()), kMaxThreads)); auto num_threads = (req_num_threads < 0) ? std::thread::hardware_concurrency() : req_num_threads;
num_threads = std::max(1, std::min(static_cast<int>(num_threads), kMaxThreads));
std::cout << "# of threads = " << num_threads << std::endl; std::cout << "# of threads = " << num_threads << std::endl;
auto t1 = std::chrono::high_resolution_clock::now(); auto t1 = std::chrono::high_resolution_clock::now();
@@ -1022,6 +1029,11 @@ main(int argc, char **argv)
return EXIT_FAILURE; return EXIT_FAILURE;
} }
int req_num_threads = -1;
if (argc > 2) {
req_num_threads = atoi(argv[2]);
}
#ifdef _WIN64 #ifdef _WIN64
HANDLE file = CreateFileA("lineitem.tbl", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL); HANDLE file = CreateFileA("lineitem.tbl", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
assert(file != INVALID_HANDLE_VALUE); assert(file != INVALID_HANDLE_VALUE);
@@ -1074,7 +1086,7 @@ main(int argc, char **argv)
printf("fsize: %lu\n", fileSize); printf("fsize: %lu\n", fileSize);
#endif #endif
parse(p, fileSize); parse(p, fileSize, req_num_threads);
return EXIT_SUCCESS; return EXIT_SUCCESS;
} }