python 模拟线程并发

最近做python，下面是一段测试数据库性能的代码。

数据库表记录：1000000条。

开200个线程，100个同时并发。

#!/usr/bin/python
# -*- coding: utf-8 -*-
import sys
import os
import os.path
import re
import MySQLdb
import httplib, mimetypes
import traceback
import logging
import ConfigParser
import time
import threading
import string
import codecs
import random
import datetime

class SelectView(threading.Thread):
   
    def __init__(self, threadName):
        threading.Thread.__init__(self, name = threadName)
   
    def run(self):
       
       
        #global dbConn
        #dbConn = MySQLdb.connect(host=dbhost, port=dbport, user=dbuser, passwd=dbpass, db=dbschema, use_unicode=True, charset='utf8')
       
        for i in range(100):
       
           start=time.time()
       
            print self.getName(),"-->Threadstart!"+getDbDateString()
            logger.info(self.getName()+"-->Threadstart!"+getDbDateString())
            try:
                dbConn = None
                dbConn = MySQLdb.connect(host=dbhost, port=dbport, user=dbuser, passwd=dbpass, db=dbschema, use_unicode=True, charset='utf8')
       
                strss = string.join(random.sample(['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','T','Z'], 1)).replace(" ","")
                #print "query str----"+strss
                sql = "SELECT * FROM smartone_metainfo_view as s where songName like '%"+strss+"%' limit 200"
                cursor = dbConn.cursor()
                cursor.execute(sql)
                songid =""
                for counts in cursor.fetchall():
                   
                    songid= songid + str(counts[0])+str(counts[1])+str(counts[2])+str(counts[3])+str(counts[4])+str(counts[5])+str(counts[6])+str(counts[7])+str(counts[8])+str(counts[9])+str(counts[10])+str(counts[11])+str(counts[12])+str(counts[13])+str(counts[14])+str(counts[15])+ str(counts[16])+str(counts[17])+str(counts[18])+str(counts[19])+str(counts[20])+str(counts[21])+str(counts[22])+str(counts[23])+str(counts[24])+str(counts[25])+str(counts[26])+str(counts[27])+str(counts[28])+str(counts[29])+str(counts[30])+str(counts[31])
                end =time.time()
                sec = end -start
                print " thread,execute total time is----",sec," second"
                logger.info(" thread execute finish,execute total time is----"+str(sec)+" second")
                print songid
                #print "size --"+str(len(counts))+"songId---"+str(counts[0])# self.getName(),"--query result:--total count--"+str(counts[0])#+"----songName:"+counts[1]+"----isrc"+str(counts[2])  
                #logger.info("size --"+str(len(counts))+"songId---"+str(counts[0]))
               
                #print "command free----",os.system('free')
                dbConn.close()
            except:
               etype, evalue = sys.exc_info()[:2]
               logger.info(self.getName()+"--Thread,-query data failed!---Type: " +str(etype)+"----Value--:"+str(evalue))
              
               print "Type: " , etype
               print "Value: " , evalue
        #cmd = "mysqladmin -uMELODEO_USER -p6DF0FF9674EC1A397A430F9F2FCB2C64 -h202.153.121.172 status"
#        strs = os.system(cmd)
        #lines = os.popen(cmd).readlines()
        #for line in lines:
        #    print line.rstrip()
        #logger.info("".join(lines))     
       
           
        #sem.release()
       

#=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

def init_settings(profile, config_file):
        #read ini file
    #    config_file = "c:/contentstext/processCommonFormat.ini"
    #    print os.getcwd()
        cfg = ConfigParser.RawConfigParser()
        cfg.read(config_file)
    
        #define the directory we are writing out to and some other parameters.
        global dbhost
        dbhost = cfg.get(profile, "dbhost")
        global dbport
        dbport = int( cfg.get(profile, "dbport"))
        global dbuser
        dbuser = cfg.get(profile, "dbuser")
        global dbpass
        dbpass = cfg.get(profile, "dbpassword")
        global dbschema
        dbschema = cfg.get(profile, "db")
        global USE_UNICODE
        try:
            use_unicode = cfg.get(profile, "USE_UNICODE")
            if (use_unicode == 'Y'):
                USE_UNICODE=True
            else:
                USE_UNICODE=False
        except:
            USE_UNICODE=False
    
        #set up logs - ripped from contentManager.py
        LOG_FILE = './smartone_200.log'
   
        val = cfg.get(profile, "loglevel")                    # The configured log level
        if len(val) >0:
            if val == 'debug':
                log_level = logging.DEBUG
            elif val == 'info':
                log_level = logging.INFO
            elif val == 'warning':
                log_level = logging.WARNING
            elif val == 'error':
                log_level = logging.ERROR
            elif val == 'critical':
                log_level = logging.CRITICAL
        else:
            log_level = logging.INFO
   
        val = cfg.get(profile, "log_format")        # The format string for this logging session
        if len(val) >0:
            log_format = val
        else:
            log_format = '%(asctime)s %(levelname)s %(message)s'
   
        ###################
        # Initialize logger
        global logger
        logger = logging.getLogger('sessioninfo')
        hdlr = logging.FileHandler(LOG_FILE)
        formatter = logging.Formatter(log_format)
        hdlr.setFormatter(formatter)
        logger.addHandler(hdlr)
        logger.setLevel(log_level)   

def getDbDateString():
    now = datetime.datetime.today()
    #should probably do this using a formatting string - don't feel like reading docs.
    return str(now.year) + "-" + str(now.month) + "-" + str(now.day) + " " + str(now.hour) + ":" + str(now.minute) + ":" + str(now.second)