Publishing speed slower with Java 17 than with Java 1.8 [Windows]

Expected Behavior

I publish on Windows a large (about 2000 topics) DITA Map to HTML5 with default settings: https://github.com/oxygenxml/userguide/blob/master/DITA/UserManual.ditamap With both Java 17 and 1.8 they should get published in about the same time.

This continues on this comment I added here some time ago: https://github.com/dita-ot/dita-ot/issues/3621#issuecomment-720276269

Actual Behavior

With Java 1.8 it gets published in about 253 seconds, with Java 17 it gets published in about 400 seconds.

Possible Solution

• Set the -Dsun.io.useCanonCaches=true system property in the dita script file which starts the Java process. There was a change in Java 12 which changed default for the cache to false. As the DITA OT works intensively with files, enabling this property seems to make a big difference and remove this large publishing time difference between Java 1.8 and 17…
• Setting store-type=memory as a parameter also helps as a workaround to reduce the publishing time with Java 17.

Steps to Reproduce

1. Download https://github.com/oxygenxml/userguide
2. Publish “DITA/UserManual.ditamap” to HTML5 using default params and Java 17
3. Publish “DITA/UserManual.ditamap” to HTML5 using default params and Java 8
4. Compare publishing times

Environment

Windows, Java 17 Eclipse Adoptium

• DITA-OT version: 3.7
• Operating system and version: Windows
• How did you run DITA-OT? (dita command)
• Transformation type: (HTML5.)

[raducoravu]

@chrispy-snps @jelovirt for consistency sake maybe we could add the flag in both dita scripts. Even if it just shaves off a few seconds on Linux it still makes the processing more efficient and consumes less CPU resources.

[raducoravu]

@chrispy-snps great thanks for taking the time to put this together.