How to improve connection server performance to reduce package lose rate

[#1]

• There is a test on connection server 7.2. With 4core CPU and 8GB memory, we sent 1000 http requests every second and there is 5% http request losted. After changing configuration for connection server, the lost rate drop to 0.86%.
• Here are some suggestions to improve connection server performance

1. Reset parameters in connection server configuration file cxserver.conf. (..\conf\cxserver.conf)
   • Adjust parameters max-connection-pool-size and max-wait-queue-size
   • 
2. Change the default JVM settings. (increase memory for JVM properly)
   • In this case, I created a new file named startMyConnectionServer.bat file with below code:

• SET CONNECTION_SERVER_HOME=C:\connection-server-7.2.0.2095

• SET JAVA_OPTS=-Xms2G -Xmx2G

• %CONNECTION_SERVER_HOME%\bin\connection-server.bat

3. Increase connection server's hardware (memory, CPU cores)
   • Minimum system requirement 16GB memory, 4 CPU cores.
     • Refer to ThingWorx Core 8.0 System Requirements for more hardware information

[cdovholuk]

Could you please specify which version of connection server? I thought I could figure it out from the linked pdf but that brings me to a ThingWorx Core pdf and it's not the same as the Connection Server. I'm pretty sure it's something > Connection Server 7.2 but I'm wondering which one exactly.

Do you have some supporting evidence as to why changing the max-connection-pool-size and max-wait-queue-size from the defaults made a tangible difference? Perhaps some data to share? I'd be very interested in your analysis and how you came to these conclusions.

I don't recommend changing the connection-server.bat file (or connection-server for linux). Instead I'd recommend you make a script that sets those variables in a shell and passes them into the Connection-Server by using the JAVA_OPTS path. If you modify the file you'll likely need to remember to make these changes every time you update the Connection Server code.

I oversee the product development team responsible for this product. I would appreciate any information you have to share Li Li Liu​.

[liliu]

Hi Clint,

Many thanks for your advice on my article. I've changed the location form Developer Community to ThingWorx Support Team Collaboration to validate. 

It's Connection Server 7.2. This article is a summary of my TS case. Customer doing pressure test on connection server. They sent 1000 http requests every second and there is 5% http request losted. After changing max-connection-pool-size and max-wait-queue-size and combine with increase JVM memory size, the lost rate drop to 0.86%. For your suggestion on JAVA_OPTS, I added it to the article and also give a more detail symptom.

If you have any furhter concern for this article, just feel free to let me know.

Again, I am really appreciated of your advices.

Best Regards,

Lily

[lindafrembes]

Hello,

Was this post moved? Clint Dovholuk reached out to me and let me know that he can no longer access this post and therefore cannot reply.

Best,

Linda

[cdovholuk]

Does this group think it would be useful for R&D to document our products with a "how to install the software as a service"? (i don't know if every product does this) I only ask because the proper way to do this is to make a script that calls the emessage.bat file. So i would make a "startMyConnectionServer.bat" and somehow make it a service (so that when the server restarts it starts) and I would specify it like:

{code}

SET CONNECTION_SERVER_HOME=c:\thingworx\connection-server

SET JAVA_OPTS="-Xms2G -Xmx2G"

%CONNECTION_SERVER_HOME%\bin\connection-server.bat

{code}

(something like that)

Editing the connection-server.bat is not recommended because you'll have to remember to update the file when you update the software.

[liliu]

Hi Clint,

Thanks. I updated your suggestion to my article.

BR,

Lily