최대 동시접속자 수 테스트용 프로그램입니다.



컴파일 방법:

g++ -o mysql-con-stress -I/usr/local/mysql/include/mysql/ -L/usr/local/mysql/lib/mysql/ -lmysqlclient mysql-con-stress.cc



사용방법:

./mysql-con-stress host user pass max_tries



host : 예를 들면 localhost

user : root

pass : 암호

max_tries : 최대동시접속자 수



성공시:

Successefully established 1500 connections

Never failed

Cleaning up 1500 connections ...

Clean up complete



실패시:

Successefully established 1501 connections

Failed because Too many connections

Cleaning up 1501 connections ...

Clean up complete



MySQL Client 상에서 최대 동시접속 확인법:

show status like \max_used_connections\;

이 결과값이 max_tries와 일치하여야 함.



주의사항: mysql_connect 함수가 deprecate 되었으므로 mysql_real_connect 함수로 수정하였습니다. 자신의 MySQL버젼에서 오류가 발상할 경우 mysql_init() 부분을

삭제하고 mysql_real_connect 함수를 mysql_connect()함수로 수정바랍니다.



/*

* mysql-con-stress.cc by Sasha Pachev

* Stresses a running mysqld to see the maximum number of additional concurrent

* connections it can handle

* to compile: g++ -o mysql-con-stress -I<where_mysql.h_is_found> \r

-L<where-libmysqlclient-is-found> mysql-con-stress.cc -lmysqlclient

* to use: mysql-con-stress host user pass max_tries

* If the first three parameters are not obvious, you should not be using this program

* max_tries is the maximum number of concurrent connection mysql-con-stress will try to

* estabilsh

*/

#include <mysql.h>

#include <iostream.h>

#include <stdlib.h>

#include <sys/types.h>

#include <signal.h>



int num_cons = 0;

MYSQL* glob_cons = NULL;



void clean_up(int )

{

int i;

cerr << \Cleaning up \ << num_cons << \ connections ...\ << endl;





for(i = 0; i < num_cons; i++)

{

mysql_close(glob_cons + i);

}



cerr << \Clean up complete\ << endl;

exit(0);

}



void usage()

{

cerr << \Usage: mysql-con-stress host user pass max_tries\ << endl;

exit(1);

}



int main(int argc, char** argv)

{

if(argc != 5) usage();

char* user, *host, *pass;

int max_tries;



user = argv[2];

host = argv[1];

pass = argv[3];

max_tries = atoi(argv[4]);



MYSQL cons[max_tries];

glob_cons = cons;



int i;

int never_failed = 1;

int port = 0;



// if we get a signal, clean up first



signal(SIGTERM, clean_up);

signal(SIGINT, clean_up);



// establish as many connections as we can



for(i = 0; i < max_tries; i++)

{

mysql_init(&cons);

mysql_real_connect(cons + i, host, user, pass, \test\, 0, NULL, 0);

num_cons = i ;



if((mysql_error(cons + i))[0])

{

never_failed = 0;

cout << \Successefully established \ << num_cons << \ connections\ << \r

endl; cout << \Failed because \ << mysql_error(cons + i) << endl;

break;

}

}





if(never_failed)

{

num_cons = i ;

cout << \Successefully established \ << num_cons << \ connections\ << endl;

cout << \Never failed \ << endl;

}



// this is really not necessary, because exiting will close all the connection,

// but it is good practice to clean up



clean_up(0);



return 0;

}


출처 : http://database.sarang.net/?inc=read&criteria=mysql&subcrit=columns&aid=16454