Hi Michel,
Thanks for the quick and easy github repository to reproduce this.
Looking at the code running with jvisualvm I can't see any excessive
memory usage. Both with JDK 8u60 and 9 heap usage is around 150 MB.
The fact that Java reserves a lot of memory on Linux is a well-known
fact. It's not related to Nashorn, but rather to how Java interacts with
the Linux memory system. It is a bit annoying, but usually it's not a
problem and does not reflect Java heap usage.
Hannes
Am 2015-10-05 um 20:02 schrieb Michel Krämer:
Hi!
I'm currently working on TypeScript support for Vert.x. I'm trying to
run the TypeScript compiler on Nashorn. It works well, but the process
uses a lot of memory. I'm wondering if there is a bug in Nashorn or if
I'm doing something wrong.
I uploaded a small example project demonstrating the issue:
https://github.com/michel-kraemer/nashorn-memory-test
I tested it under Ubuntu 14.04 with JDK 8u60. I run
javac Main.java && java -Xmx256M -cp . Main
and watch the process with top. The resident memory quickly goes up to
1 GB and after about 20 iterations grows even further to 1.2 GB. After
about 500 iterations it sometimes even goes up to 1.5 GB where it
stays until the end of the program. That's 1.3 GB more than I
specified with -Xmx. I know this is metaspace, but I wonder why
Nashorn needs so much of it. By the way, even if I do only 1 iteration
the process still goes up to 400-500 MB.
Any ideas?
Cheers,
Michel
