… to correct myself, with code that contains closures, it’s probably global-per-thread on a single engine that remains as the least resource-consuming option (we were using a single global on single engine for all threads, in order to share expensively computed Javascript state between them).
From what I understand, global-per-thread could be implemented e.g. by having a ThreadLocal<ScriptContext> and always using that as the context in ScriptEngine.eval(script, context). It would be good to know then whether global-per-thread on single engine still allows for sharing Nashorn’s code optimization between threads? That would already be great (and as Nashorn *is* great, I’m positive here :) Regards, Jörg Am 19.02.2017 um 00:47 schrieb Frantzius, Jörg <joerg.frantz...@aperto.com<mailto:joerg.frantz...@aperto.com>>: Hi, it begins to dawn on me that closures aren’t thread-safe, at least that would explain crosstalk issues we’re seeing in JMeter tests (with a single engine for multiple threads). It would be good to know (and I guess for others as well) if somebody can confirm this? Perhaps thread-safety of closures was thinkable if Nashorn somehow stored closure state in ThreadLocals, but I guess that’s neither happening nor planned? From what I understand, closures are pervasive in Javascript code out there, and anybody using such code will currently be forced to use engine-per-thread. Thanks for any hints, Jörg --- Dipl. Inf. Jörg von Frantzius, Technical Director E-Mail joerg.frantz...@aperto.com<mailto:joerg.frantz...@aperto.com> Phone +49 30 283921-318 Fax +49 30 283921-29 Aperto GmbH – An IBM Company Chausseestraße 5, D-10115 Berlin http://www.aperto.com<http://www.aperto.de/> http://www.facebook.com/aperto https://www.xing.com/companies/apertoag HRB 77049 B, AG Berlin Charlottenburg Geschäftsführer: Dirk Buddensiek, Kai Großmann, Stephan Haagen, Daniel Simon --- Dipl. Inf. Jörg von Frantzius, Technical Director E-Mail joerg.frantz...@aperto.com Phone +49 30 283921-318 Fax +49 30 283921-29 Aperto GmbH – An IBM Company Chausseestraße 5, D-10115 Berlin http://www.aperto.com<http://www.aperto.de/> http://www.facebook.com/aperto https://www.xing.com/companies/apertoag HRB 77049 B, AG Berlin Charlottenburg Geschäftsführer: Dirk Buddensiek, Kai Großmann, Stephan Haagen, Daniel Simon
