使用proxool连接池，cpu占用率很高

给别人用springmvc 做的一个网站，数据库用的proxool配的连接池，服务器用的tomcat。但是启动后cpu占用率一下就上去了，阿里云的服务器，单核，2G内存，windows 2012
我用visualvm查看运行情况

 <?xml version="1.0" encoding="UTF-8"?> 
<something-else-entirely>
    <proxool>
        <alias>mysql</alias>
        <driver-url>jdbc:mysql://127.0.0.1:3306/lingshang1?rewriteBatchedStatements=true&amp;useUnicode=true&amp;characterEncoding=UTF-8</driver-url>
        <driver-class>com.mysql.jdbc.Driver</driver-class>
        <driver-properties>
            <property name="user" value="root" />
            <property name="password" value="root" />
        </driver-properties> 
    <house-keeping-sleep-time>90000</house-keeping-sleep-time> 
    <prototype-count>5</prototype-count> 
    <maximum-connection-count>50</maximum-connection-count> 
    <minimum-connection-count>5</minimum-connection-count>
    </proxool>
</something-else-entirely>