Rick Noel Systems Programmer | Westwood One rn...@westwoodone.com
-----Original Message----- From: Christopher Schultz <ch...@christopherschultz.net> Sent: Wednesday, March 27, 2024 8:24 AM To: Tomcat Users List <users@tomcat.apache.org>; Rick Noel <rn...@westwoodone.com.INVALID> Cc: Voodoo nmulcahy gmail <nmulc...@gmail.com>; David Jung <david.j...@cumulus.com> Subject: [EXT]Re: performance tunning of Tomcat 10 Rick, On 3/27/24 07:53, Rick Noel wrote: > I was wondering if the apache foundation has any tools we can use to > fine tune Tomcat 10. Tools to deteming how to set the best heap size > for Tomcat startup and the best connection attributes of > minSpareThreads and MaxThreads. What is your goal? Our application is a sip phone call handling application.(A voice response xml application) The goal is to not have call bottleneck at peak call volume. Sometimes too many folks call at one time hit our app and calls are not handle correctly. > I know my application at times will reach 100 concurrent connections > and some times goes has high as 500 connections. Okay. Well I do not have actual traffic info down to the sec, But from the application logs I know that that points in the day more than 300 calls can come in > Should I boost minSpareThreads and maxThread values of what I plan to > use below? > Or why would we not just set very high minSpareThreads > and maxThread values like minSpareThreads =300 and maxThread=1000 > > This is a snippet of my server.xml > > <Executor name="tomcatPhoneAppThreadPool" namePrefix="catalina-executor-" > minSpareThreads="50" > maxThreads="300" /> > > <Connector port="8585" > executor="tomcatPhoneAppThreadPool" > compression="on" > compressionMinSize="2048" > > compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,application/json,application/xml" > protocol="org.apache.coyote.http11.Http11NioProtocol" > redirectPort="8443"> > <UpgradeProtocol > className="org.apache.coyote.http2.Http2Protocol" /> > > </Connector> > > Also, am I good with setting > protocol="org.apache.coyote.http11.Http11NioProtocol" > And then setting <UpgradeProtocol > className="org.apache.coyote.http2.Http2Protocol" /> > > That will tell Tomcat to do HTTP2 Correct? That's the only way to enable h2. Well... you could use Http11Nio2Protocol, too. NIO is the default protocol so you don't even need to add that specifically if you don't want to. Back to threads. Each thread (unless you go virtual, but that's not really production-ready IMHO at this point unless you have very strict circumstances where it will work great for you) takes up a bunch of memory, so you can't just set maxThreads=1M. Threads take "time" to start, but it's not really that much. If starting and stopping threads is what is making your application slow, than you have a very high-performance application and environment indeed. Your question as stated is unanswerable. You say you are sometimes hitting 500 connections. The default maximum number of connections is 10000 and you are only using 500. That means you aren't being flooded, which is a Good Thing. (BTW: How are you measuring "how many connections" you have? Make sure you are measuring the right thing... I am estimating the actual connections just based on application call logs. Is your *current* maxThreads set to 500? If so, then your thread pool maximum is set to your high-water mark which seems like it should be fine. If you set your maxThreads to 1000 you won't get any benefit because only 500 requests are ever being sent at once, right? What else does your application do? Our application is a sip phone call handling application.(A voice response xml application) For example, if you have a thread-pool max-threads of 1000 and your application uses an RDBMS for every request but your db connection pool size is more like 10, then many threads waiting on a small number of connections gets you absolutely no benefit. You'd have to make changes elsewhere in your application in order to make use of those extra threads. Similarly, if you have a big thread pool and a big db connection pool, but your database performs slowly, then having all that power on the application server doesn't really help you. Yes our app is using a database (we use Postres) And yes I assume that is our bottleneck Our tomcat context.xml defines that database maxConnction to be only maxTotal="20" We have other apps and that hit this same database, so we define low maxTotal on each server so each server can have only limit connection access to the database I am thinkingit would be best to try and NOT optimize minSpareThreads and maxThreads but instead to determine what is the optimal Database connection maxTotal to set So anyone trying to answer "how big should be thread pool be" really needs to understand the nature of your application and the other things happening in your environment. Sometimes the answer is "just add more threads/CPUs/memory" and sometimes the answer is "re-think your application architecture". -chris --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you know the sender and you are sure the content is safe. Please report the message using the Report Message feature in your email client if you believe the email is suspicious.
