java graal.js interop

[boris.spasojevic]

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. 


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-------- 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.

-Adam



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 Java.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 
Hi,

I am unsure if this is the best place to post user questions about Graal.js,

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.

Best,

-Adam M.