apache - ab压测php+redis，为什么很快就挂掉了？

E:\phpStudy\Apache\bin>ab-c1000-n10000http://localhost/mysql.phpThisisApacheBench,Version2.3<$Revision:1604373$>Copyright1996AdamTwiss,ZeusTechnologyLtd,http://www.zeustech.net/LicensedtoTheApacheSoftwareFoundation,http://www.apache.org/Benchmarkinglocalhost(bepatient)Completed1000requestsCompleted2000requestsCompleted3000requestsCompleted4000requestsCompleted5000requestsCompleted6000requestsCompleted7000requestsCompleted8000requestsCompleted9000requestsCompleted10000requestsFinished10000requestsServerSoftware:Apache/2.4.10ServerHostname:localhostServerPort:80DocumentPath:/mysql.phpDocumentLength:242bytesConcurrencyLevel:1000Timetakenfortests:39.351secondsCompleterequests:10000Failedrequests:9(Connect:9,Receive:0,Length:0,Exceptions:0)Totaltransferred:4440000bytesHTMLtransferred:2420000bytesRequestspersecond:254.12[#/sec](mean)Timeperrequest:3935.125[ms](mean)Timeperrequest:3.935[ms](mean,acrossallconcurrentrequests)Transferrate:110.19[Kbytes/sec]received==========================以上的MYSQL，以下是REDIS===============================E:\phpStudy\Apache\bin>ab-c1000-n10000http://localhost/redis.phpThisisApacheBench,Version2.3<$Revision:1604373$>Copyright1996AdamTwiss,ZeusTechnologyLtd,http://www.zeustech.net/LicensedtoTheApacheSoftwareFoundation,http://www.apache.org/Benchmarkinglocalhost(bepatient)Completed1000requestsTestabortedafter10failuresapr_socket_connect():由于目标计算机积极拒绝，无法连接。(730061)Totalof1714requestscompleted

MYSQL可以跑，REDIS很快就挂掉了，下面是代码

$host='mysql:host=127.0.0.1;dbname=test';$user='root';$pass='root';$pdo=newPDO($host,$user,$pass);var_dump($pdo->query('select*fromtablewhereid=1')->fetch());die;==========================以上的MYSQL，以下是REDIS===============================$redis=newredis();$redis->connect('127.0.0.1',6379);$redis->set('test','testvalue');var_dump($redis->get('test'));$redis->delete('test');