Patching Marlin on Windows Server

Derek Watling

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Jan 6, 2021, 10:03:07 AM1/6/21

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I come from a Windows background and have limited knowledge of Java. I have recently setup a new server running:

Windows Server 2019 Standard
AdoptOpenJDK: 11.0.9.1 (Hotspot)
Tomcat 9.0.40
Geoserver 2.18.1

When Geoserver is generating new tiles the CPU usage goes over 90% and the system becomes very sluggish. (My previous setup with Java 8 / Tomcat 8 / Marlin performed much better). I suspect that not having Marlin properly enabled is the cause, but have been unable to apply the module patch.

OpenJDK is installed in: C:\Program Files\AdoptOpenJDK\jdk-11.0.9.101-hotspot\

I have downloaded and saved the marlin jar in: C:\Program Files\AdoptOpenJDK\Marlin\marlin-0.9.4.2-Unsafe-OpenJDK9.jar

The usage is given as:

java --patch-module java.desktop=<path>/marlin-0.9.4.2-Unsafe-OpenJDK9.jar ...

but I am unsure how to hanle the directory name containg a space and what needs to come at the end where the ellipsies are. I have tried various things and Googleling with no success.

Also a unsure as to if the patch is only applied once or added to Tomcat's Java options, and what else should be included in the Java Options?

Thank you

Laurent Bourgès

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Jan 6, 2021, 12:56:55 PM1/6/21

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Hi,

OpenJDK11 already includes the Marlin renderer v0.9.1.3 (enabled by default) so performance should be good enough. More recent versions should not make a huge difference.

Maybe your tomcat, JVM settings (memory, tuning) or GeoServer configuration are not good.

PS: for latest patch release, you could move your marlin patch file in C:/marlin/ so the path will be easier (fucking windows path syntax !!):

java --patch-module java.desktop=C:/marlin/marlin-0.9.4.2-Unsafe-OpenJDK9.jar ...

Cheers,

Laurent

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Laurent Bourgès

Derek Watling

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Jan 7, 2021, 2:04:51 AM1/7/21

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Hi Laurent

Thank you for the feed back. When I try that patch I then get

Error: Could not find or load main class ...
Caused by: java.lang.ClassNotFoundException: ///

Laurent Bourgès

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Jan 7, 2021, 3:14:33 AM1/7/21

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Please be more concrete:

What are your tomcat settings, java command... logs ?

This mailing list is not a support plan for tomcat or java 11...

I just do my best to understand your issue, but without any details, I can't help.

Laurent

The single maintainer of Marlin's projects.

To view this discussion on the web visit https://groups.google.com/d/msgid/marlin-renderer/2d9f2dae-8cfd-4d26-bd10-9653219f67e7n%40googlegroups.com.

Derek Watling

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Jan 7, 2021, 4:07:28 AM1/7/21

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Hi Laurent

Thanks for your help.

After removing the extra java options tht I had documented from my previous installation the performance has improved significantly even when Geoserver is caching tiles in the background.

I had assumed (based on outdated setup guides) that not having the latest Marlin was the bottleneak.