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From o haya <oh...@yahoo.com.INVALID>
Subject Re: [users@httpd] Getting "connection refused" Apache 2.4
Date Mon, 16 Nov 2015 20:44:22 GMT
Hi Daniel,
Unfortunately, the Apache I'm working with is part of a product, so I won't be able to change
to a different MPM type.
I've been trying what you suggested (increasing MinSpareServers) but I still get tons of connections
refused, even when I can confirm that, for example, I get 500+ httpd instances at startup
(e.g., ps -ef shows 500 instances).  Is it possible that something else (e.g., the Redhat
OS itself) is limiting the number of connections?
Thanks,Jim

      From: Daniel <dferradal@gmail.com>
 To: users@httpd.apache.org; o haya <ohaya@yahoo.com> 
 Sent: Monday, November 16, 2015 3:07 PM
 Subject: Re: [users@httpd] Getting "connection refused" Apache 2.4
   
migrate to worker or event...if you have to stick with prefork mpm, increase the number of
MinSpareServers to a very high number, prefork is very slow spawning new children since it
is not threaded, so better spawn most when apache starts.


El lun., 16 nov. 2015 a las 20:58, o haya (<ohaya@yahoo.com.invalid>) escribió:

Hi,

I am trying to do some load testing of Apache 2.4 on Redhat.

Configuration displayed when I run "httpd -V" shows:

Server MPM: prefork
threaded: no
forked: yes (variable process count)

I am using Jmeter to test, and when I increase the number of simultaneous threads to >
200, I am seeing increasing number of errors, with a lot of "connection refused" errors, e.g.:

org.apache.http.conn.HttpHostConnectException: Connection to http://10.0.3.10:80 refused
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:190)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:294)
        at org.apache.jmeter.protocol.http.sampler.MeasuringConnectionManager$MeasuredConnection.open(MeasuringConnectionManager.java:107)
        at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:643)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:479)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
        at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:517)
        at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:331)
        at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
        at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1146)
        at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1135)
        at org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:434)
        at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection timed out: connect
        at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
        at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:127)
        at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)
        ... 14 more


I've been trying to re-configure the Apache to avoid these errors, e.g., increasing "MaxClients",
and I've also increased the amount of memory for the machine (to 4GB) but so far, nothing
I have done has improved the situation.

Is there something else that I can do to try to get the Apache so that it can accept the larger
number of connections?

Thanks,
Jim



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