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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: a question about tomcat thread
Date Thu, 24 Aug 2017 20:39:38 GMT
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Mark,

On 8/23/17 4:26 PM, Mark Thomas wrote:
> On 23/08/17 21:17, Christopher Schultz wrote:
>> To whom it may concern,
>> 
>> On 8/22/17 10:28 PM, ophusky wrote:
>>> Server version: Apache Tomcat/8.0.35 Server built:   May 11
>>> 2016 21:57:08 UTC Server number:  8.0.35.0 OS Name:
>>> Linux OS Version:     3.2.35 Architecture:   amd64 JVM
>>> Version: 1.8.0_45-b14 JVM Vendor:     Oracle Corporation
>> 
>> Thanks!
>> 
>>> 1. [root@app41 manager]# curl -s
>>> http://127.0.0.1/manager/status |grep -P -o 'Max
>>> threads:.*?<br> ' Max threads: 700 Current thread count: 478
>>> Current thread busy: 17 Keeped alive sockets count: 5<br> 2.
>>> [root@app41 manager]# pgrep jsvc 25446 25447 [root@app41 
>>> manager]# ps -Lf 25447 | wc -l 541
>> 
>> Okay.
>> 
>>> I want to figure out the meaning of "Current thread count" 
>>> "Current thread busy" "Keeped alive sockets count" and
>>> relationship between 1 and 2.
>> 
>> Max threads >= current thread count Current thread count >=
>> current thread busy Current thread count >= Keeped alive sockets
>> count
> 
> That is true for BIO, but not for any of the other connections
> which are all non-blocking between requests. With those connectors
> you can have up to maxConnections open sockets in HTTP keep-alive
> waiting for data to arrive.

Yes, but the keep-alive connections are not using a thread from any
pool. It's not clear to me whether "keeped alive sockets count"
actually counts the sockets or the threads. I don't use the manager
application for anything other than JMX :)

- -chris
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