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List:       openjdk-nashorn-dev
Subject:    Re: Efficiency of context-per-thread on shared engine vs. engine + context per thread?
From:       "Jim Laskey (Oracle)" <james.laskey () oracle ! com>
Date:       2017-02-27 12:14:30
Message-ID: DEF531D3-56E8-4E9D-9347-7B7C9B121D86 () oracle ! com
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From basic experience I found that using a single engine, using JavaScript code to \
create the new threads and using loadWithNewGlobal to start each thread gave the best \
overall performance.

- Jim


> On Feb 27, 2017, at 7:58 AM, Frantzius, Jörg <Joerg.Frantzius@aperto.com> wrote:
> 
> Hi,
> 
> for our application we're about to implement a global-per-thread on single engine \
> approach, and I'd be very thankful if someone in the know could share some insights \
> on whether this is worth the effort when compared to engine-per thread (as the \
> latter seems much more easy to implement for us). 
> More precisely the question is whether a single engine with multiple ScriptContexts \
> is substantially more resource-efficient than multiple engines (each with their own \
> ScriptContext)? Does Nashorn e.g. share code-optimization between engines? Or does \
> it share code-optimization between ScriptContexts on a single engine in the first \
> place? 
> Also it would be great to know about the memory-footprint of the engine, e.g. \
> http://stackoverflow.com/questions/24116672/how-much-memory-does-a-nashorn-scriptengine-use \
> seems to say that an empty engine is ~324KB, but I'd expect that to be higher when \
> it is actually executing code. 
> Thanks for any insights + regards,
> Jörg
> 
> 
> ---
> 
> Dipl. Inf. Jörg von Frantzius, Technical Director
> 
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