java graal.js interop
adam at cs.miami.edu
Sun Dec 10 21:21:41 UTC 2017
 Yes, you are completely correct and that is what I observed with regard
to performance. Though in my silly little micro test, Nashorn (warmed up)
beat both graal-SVM and graal-JVM. Now I think I have a better idea how
Graal.js works inside or outside of JVM.
 User group? Do you think there is enough interest in GraalVM to
create a user group (perhaps a goolge group?) I would enjoy discussing
GraalVM: pros/cons and use cases, but do not want to clutter the dev group.
On Sun, Dec 10, 2017 at 4:39 AM, boris.spasojevic <
boris.spasojevic at oracle.com> wrote:
> Hey Adam,
> Running with --jvm means that the js code is also executed on the JVM.
> Running js on the JVM requires substantially longer warm-up time than
> running on SVM but yields better peek performance. I'm assuming that your
> example just isn't running long enough to get the full benefits of the JVM.
> Sent from my Samsung Galaxy smartphone.
> -------- Original message --------
> From: Adam McMahon <adam at cs.miami.edu>
> Date: 12/10/17 09:46 (GMT+01:00)
> To: "boris.spasojevic" <boris.spasojevic at oracle.com>
> Cc: graal-dev at openjdk.java.net
> Subject: Re: java graal.js interop
> Hi Boris,
> Thanks for the heads-up, that works well with the --jvm option.
> However, when I add the --jvm option, I noticed that pure JS code ran much
> slower (not just a slower startup, which was expected, but slower execution
> of pure JS). I can provide an example, if needed, but this was unexpected
> to me as an end user. --polyglot did not slow down the JS execution.
> it seems odd to me that just including the JVM as an option would slow
> down the Graal.js execution of pure JS.
> On Sun, Dec 10, 2017 at 2:24 AM, boris.spasojevic <
> boris.spasojevic at oracle.com> wrote:
>> Hey Adam,
>> I am also unsure if this is the best place to answer user questions about
>> Graal.js but here goes :)
>> Without going into to much detail, js executes on SVM by default. You
>> need to run js with --jvm in order to execute on the JVM and have access to
>> So: "js --jvm myscript.js"
>> If you need access to the other truffle languages add --polyglot.
>> "js --polyglot myscript.js" which will run on SVM with polyglot enabled.
>> If you want Java + other languages just add both:
>> "js --jvm --polyglot myscript.js"
>> Hope that helps.
>> Sent from my Samsung Galaxy smartphone.
>> -------- Original message --------
>> From: Adam McMahon <adam at cs.miami.edu>
>> Date: 12/10/17 02:27 (GMT+01:00)
>> To: graal-dev at openjdk.java.net
>> Subject: java graal.js interop
>> I am unsure if this is the best place to post user questions about
>> I am not able to get the JS examples working that use Java. I get the
>> following error:
>> ReferenceError: Java is not defined
>> It seems that Java.type(String), is not defined. I am running Graal.js by
>> using "js myscript.js" on Ubuntu 16, graalvm-0.30.
>> -Adam M.
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