GetPrimitiveArrayCritical vs GetByteArrayRegion: 140x slow-down using -Xcheck:jni and java.util.zip.DeflaterOutputStream (original) (raw)

Alan Bateman Alan.Bateman at oracle.com
Mon Mar 5 08:42:12 UTC 2018

On 05/03/2018 06:33, David Holmes wrote:

Hi Ian, Do you run with -Xcheck:jni in production mode because you load unknown native code libraries? It's mainly intended as a diagnostic option to turn on if you encounter a possible JNI problem. It does unusual to be running with -Xcheck:jni in a performance critical environment. I would expect to see-Xcheck:jni when developing or maintaining a library that uses JNI and drop the option the code has been fulling tested.

Lots of good work was done in JDK 9 to replace the ZipFile implementation with a Java implementation and it would be good to get some results with a re-write of Inflater and Deflater. It would need lots of testing, including startup. We would need have a dependency on libz of course as it is needed by the VM to deflate entries in the jimage container (when they are compressed) or access JAR files on the boot class path.

-Alan

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