Thanks, Mark.
Here are some additional details.
I am using Apache JMeter to inject load. I am using a simple hello-world JSP.
The test JMX simulates 100 concurrent user threads with a ramp-up of 5 secs and
uses an HTTP Cookie Manager, that reuses cookies for each user thread.
I have disabled access log in tomcat. All the other server.xml settings are the
default.
The BIO with Executor configuration we are using is:
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
<Connector port="8080" protocol="org.apache.coyote.http11.Http11Protocol"
connectionTimeout="20000"
redirectPort="8443" />
It's the same for NIO. Just the protocol changes.
The client(jMeter) and server (Tomcat) are on 2 separate physical machines with
the same configuration:
RHEL 7.1 x64
16 core CPU;
32 GB RAM;
1Gbps NIC
------------------------------------------------------------- JSP test page
--------------------------------------------
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello World - JSP tomcat test</title>
</head>
<body>
<%= "Hello World! - JSP on Tomcat 8.15" %>
</body>
</html>
------------------------------------------------------------- JSP test page
-------------------------------------------------------------
Test result:
helloWorld.JSP
BIO
NIO
BIO w/ Exec
NIO w/ Exec
Throughput
ART
Throughput
ART
Throughput
ART
Throughput
ART
Tomcat 7.077
38600
2
42664
2
57104
1
43660
2
Tomcat 8.0.44
38585
2
44752
2
63000
1
44341
2
Tomcat 8.0.32
41211
Tomcat 8.5.14
N/A
45600
1.67
N/A
46000
1.67
Regards,
Piyush.
-----Original Message-----
From: Mark Thomas [mailto:ma...@apache.org]
Sent: Tuesday, June 06, 2017 12:50 PM
To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: Tomcat 8/NIO performance discrepancies
On 06/06/17 07:30, Piyush Kumar Nayak wrote:
> We have been testing different connectors of tomcat for performance.
> We have tested the following server versions:
>
> - Tomcat 7.077
>
> - Tomcat 8.0.44
>
> - Tomcat 8.0.32
>
> - Tomcat 8.5.14
>
> with the following HTTP connectors:
>
> - BIO
>
> - BIO with Executor
>
> - NIO
>
> - NIO with Executor
>
> Our observation is that NIO is up to 15% faster than BIO. But BIO with
> Executor is up to 65% faster than BIO. Using a shared executor thread pool
> with NIO does not improve the performance. We have tried some variations of
> connector attribute with Tomcat 8 (maxThreads, acceptorThreadCount), but
> nothing brings us close to the performance that we can get with BIO with
> Executor.
>
> We have upgraded to Tomcat 8.5, and can't seem to get it to perform as well
> as Tomcat 7 using BIO with Executor, which is what we were using earlier.
>
> I would appreciate any help with the following:
>
> - Why is the executor not boosting the performance for NIO, as it is
> for BIO?
Without knowing the details of your tests - no idea. The numbers are a long way
from what I'd expect.
>
> - BIO is not available as an option with Tomcat 8.5. Why has it been
> removed? Is there any way to get it back ?
Because it can't support the non-blocking requirements of the WebSocket API or
the Servlet API and while you can fake non-blocking support, the result is
liable to enter a deadlock.
> I'd be happy to share any other details from my testing for any clarification.
You'll need to explain your testing methodology - in detail - before anyone can
provide any useful input.
Mark
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