#include <chrono> #include <iostream> #include <uuid/uuid.h> using namespace std; void uuid_generatenewUUID(int x); void uuid_generate_randomnewUUID(int x); void uuid_generate_timenewUUID(int x); void uuid_generate_timeSafenewUUID(int x); void testUuid_generate_timeSafe(int x); int main(int args,char**argv) { int x=atoi(argv[1]); uuid_generatenewUUID(x); uuid_generate_randomnewUUID(x); uuid_generate_timenewUUID(x); uuid_generate_timeSafenewUUID(x); // testUuid_generate_timeSafe(x); } void testUuid_generate_timeSafe(int x) { char* uuidValue=(char*)malloc(40); chrono::time_point<chrono::steady_clock> startTime; chrono::time_point<chrono::steady_clock> endTime; for(int i=0;i<x;i++) { startTime=chrono::steady_clock::now(); uuid_t newUUID; uuid_generate_time(newUUID); uuid_unparse(newUUID,uuidValue); endTime=chrono::steady_clock::now(); cout<<i<<","<<uuidValue<<","<<chrono::duration_cast<chrono::nanoseconds>(endTime-startTime).count()<<" nanos!"<<endl; } } void uuid_generate_timeSafenewUUID(int x) { cout<<"In uuid_generate_timeSafenewUUID!"<<endl; chrono::time_point<chrono::steady_clock> startTime; chrono::time_point<chrono::steady_clock> endTime; for(int i=0;i<x;i++) { startTime=chrono::steady_clock::now(); for(int j=0;j<1000000;j++) { uuid_t newUUID; uuid_generate_time_safe(newUUID); } endTime=chrono::steady_clock::now(); cout<<i<<","<<chrono::duration_cast<chrono::milliseconds>(endTime-startTime).count()<<" milliseconds!"<<endl; } } void uuid_generate_timenewUUID(int x) { cout<<"In uuid_generate_timenewUUID!"<<endl; chrono::time_point<chrono::steady_clock> startTime; chrono::time_point<chrono::steady_clock> endTime; for(int i=0;i<x;i++) { startTime=chrono::steady_clock::now(); for(int j=0;j<1000000;j++) { uuid_t newUUID; uuid_generate_time(newUUID); } endTime=chrono::steady_clock::now(); cout<<i<<","<<chrono::duration_cast<chrono::milliseconds>(endTime-startTime).count()<<" milliseconds!"<<endl; } } void uuid_generatenewUUID(int x) { cout<<"In uuid_generatenewUUID"<<endl; chrono::time_point<chrono::steady_clock> startTime; chrono::time_point<chrono::steady_clock> endTime; for(int i=0;i<x;i++) { startTime=chrono::steady_clock::now(); for(int j=0;j<1000000;j++) { uuid_t newUUID; uuid_generate(newUUID); } endTime=chrono::steady_clock::now(); cout<<i<<","<<chrono::duration_cast<chrono::milliseconds>(endTime-startTime).count()<<" milliseconds!"<<endl; } } void uuid_generate_randomnewUUID(int x) { cout<<"In uuid_generate_randomnewUUID"<<endl; chrono::time_point<chrono::steady_clock> startTime; chrono::time_point<chrono::steady_clock> endTime; for(int i=0;i<x;i++) { startTime=chrono::steady_clock::now(); for(int j=0;j<1000000;j++) { uuid_t newUUID; uuid_generate_random(newUUID); } endTime=chrono::steady_clock::now(); cout<<i<<","<<chrono::duration_cast<chrono::milliseconds>(endTime-startTime).count()<<" milliseconds!"<<endl; } }
Compile
g++ -std=c++2a *.cpp -o h1 -luuid
Run
./h1 10
Snapshot
Referenced https://www.man7.org/linux/man-pages/man3/uuid_generate.3.html#:~:text=The%20uuid_generate%20%28%29%20function%20creates%20a%20new%20universally,from%20getrandom%20%282%29%2C%20%2Fdev%2Furandom%2C%20or%20%2Fdev%2Frandom%20if%20available.
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