关于apache自带的ab做并发测试的问题。
各位高手，大家好，我现在这边有个棘手的问题需要解决，需要大家慷慨解囊。
问题是这样的，我使用ab来做并发测试，看具体的并发数和相应时间。
当我使用ab-n 10000-c 2000 http://192.168.1.123:8080/test/test.html.
系统报错；
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 [ DISCUZ_CODE_10 ]gt; apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 1997-2005 The Apache Software Foundation, http://www.apache.org/
Benchmarking 192.168.1.123 (be patient)
apr_pollset_create failed: Invalid argument (22)经过测试系统-c并发数请求超过1024就会报以上的错误。
上网找过类似问题，说是配置一下操作系统的注册表，调整MaxUserPort十进制为32768，TcpTimedWaitDelay十进制为240
重启系统，经过测试还是报同样的错误。
类似的问题说apache 的httpd.conf，启用httpd-mpm.conf ,并配置httpd-mpm.conf 如下：
#
# Server-Pool Management (MPM specific)
#
#
# PidFile: The file in which the server should record its process
# identification number when it starts.
#
# Note that this is the default PidFile for most MPMs.
#
<IfModule !mpm_netware_module>
PidFile "logs/httpd.pid"
</IfModule>
#
# The accept serialization lock file MUST BE STORED ON A LOCAL DISK.
#
<IfModule !mpm_winnt_module>
<IfModule !mpm_netware_module>
LockFile "logs/accept.lock"
</IfModule>
</IfModule>
#
# Only one of the below sections will be relevant on your
# installed httpd.Use "apachectl -l" to find out the
# active mpm.
#
# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
ServerLimit 5500
MaxClients 5000
MaxRequestsPerChild 10000
</IfModule>
# worker MPM
# StartServers: initial number of server processes to start
# MaxClients: maximum number of simultaneous client connections
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule mpm_worker_module>
StartServers 3
ServerLimit 5500
MaxClients 5000
MinSpareThreads 50
MaxSpareThreads 200
ThreadLimit 200
ThreadsPerChild 100
MaxRequestsPerChild10000
</IfModule>
# BeOS MPM
# StartThreads: how many threads do we initially spawn?
# MaxClients: max number of threads we can have (1 thread == 1 client)
# MaxRequestsPerThread: maximum number of requests each thread will process
<IfModule mpm_beos_module>
StartThreads 10
MaxClients 5000
MaxRequestsPerThread 10000
</IfModule>
# NetWare MPM
# ThreadStackSize: Stack size allocated for each worker thread
# StartThreads: Number of worker threads launched at server startup
# MinSpareThreads: Minimum number of idle threads, to handle request spikes
# MaxSpareThreads: Maximum number of idle threads
# MaxThreads: Maximum number of worker threads alive at the same time
# MaxRequestsPerChild: Maximumnumber of requests a thread serves. It is
# recommended that the default value of 0 be set for this
# directive on NetWare.This will allow the thread to
# continue to service requests indefinitely.
<IfModule mpm_netware_module>
ThreadStackSize 65536
StartThreads 250
MinSpareThreads 25
MaxSpareThreads 250
MaxThreads 2000
MaxRequestsPerChild 0
MaxMemFree 100
</IfModule>
# OS/2 MPM
# StartServers: Number of server processes to maintain
# MinSpareThreads: Minimum number of idle threads per process,
# to handle request spikes
# MaxSpareThreads: Maximum number of idle threads per process
# MaxRequestsPerChild: Maximum number of connections per server process
<IfModule mpm_mpmt_os2_module>
StartServers 2
MinSpareThreads 5
MaxSpareThreads 10
MaxRequestsPerChild 0
</IfModule>
# WinNT MPM
# ThreadsPerChild: constant number of worker threads in the server process
# MaxRequestsPerChild: maximumnumber of requests a server process serves
<IfModule mpm_winnt_module>
ThreadsPerChild 2000
MaxRequestsPerChild10000
</IfModule>配置完，重启服务，经过测试，还是报一样的错误。
试配置一下在tomcat的server.xml 中，把maxThreads改为2000，具体配置如下：
<Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="2000" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true"URIEncoding="utf-8"/>还是报一样的错误。
我测试的客户端电脑的配置如下：
CPU T2130 1.86GHz 1.06Ghz ,内存2.49GB
测试系统部署tomcat服务器的配置分别如下：
cpu E3500 2.70GHz 2.70GHz 1.96GB
CPU T2130 1.86GHz 1.06Ghz ,内存2.49GB
请高手指点迷津，我实在是测不出来了，呵呵！
https://blog.csdn.net/janfly79/article/details/54093900参考下这个 ulimit -a 关注 :(了解学习
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