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River Trail was announced at the Intel Developer Forum in September 2011, and demonstrated using a [[Firefox]] extension developed by Intel. [[Brendan Eich]], the original author of JavaScript, promised that he would promote River Trail within [[Ecma International]], saying "The demo shows a 15x speedup over serial JavaScript. It lights up the ridiculously parallel hardware in modern CPUs and GPUs, for audio, video, image processing, automated voice response, computer vision, 3D gaming, etc. – all written in memory-safe, clean, functional JavaScript, without threads and their data races and deadlocks."<ref>{{cite web | title = Intel extends JavaScript for parallel programming | author = Cade Metz | date = 17 September 2011 | url = http://www.theregister.co.uk/2011/09/17/intel_parallel_javascript/ | publisher = [[The Register]] | accessdate = 2013-04-10 }}</ref> Because River Trail leverages Intel's [[OpenCL]] SDK<ref>{{cite web|last=Hillar|first=Gaston|title=Introducing Intel Labs' River Trail|url=http://www.drdobbs.com/web-development/introducing-intel-labs-river-trail/231602396|work=Dr. Dobb's|date=29 September 2011|accessdate=29 January 2014}}</ref> it can exploit multiple CPU cores as well as [[Data parallelism|data parallel]] instructions (ex. [[Advanced_Vector_Extensions|AVX]], [[Streaming_SIMD_Extensions|SSE]]) and the speedup can be greater than the CPU core count would imply.
A native implementation of River Trail in Firefox's [[SpiderMonkey (JavaScript engine) |SpiderMonkey]] [[JavaScript engine]] was announced in September 2012<ref>{{cite web | title = Intel boosts JavaScript with River Trail release | author = Gareth Halfacree | url = http://www.bit-tech.net/news/bits/2012/09/13/intel-river-trail/1 | date = 13 September 2012 | publisher = [[bit-tech]] | accessdate = 2013-04-10 }}</ref> and was added to nightly Firefox builds in April 2013.<ref>{{cite web | url = https://bugzilla.mozilla.org/show_bug.cgi?id=829602 | title = Bug 829602 - ParallelDo intrinsic and self-hosted ParallelArray | publisher = [[Mozilla Foundation]] | accessdate = 2013-04-10 }}</ref> By January 2015, the code had been removed from Firefox.<ref>{{Cite web|url = https://bugzilla.mozilla.org/show_bug.cgi?id=801869|title = Bug 801869 - (PJS) PJS: Efficient threaded runtime for data-parallel JavaScript|date = 2015-01-19|accessdate = 2015-04-23|website = Bugzilla@Mozilla|publisher = Mozilla Foundation|last = |first = }}</ref><ref>{{Cite web|url=https://groups.google.com/forum/m/#!topic/mozilla.dev.tech.js-engine/H-YEsejE6DA}}</ref>
== Operation ==
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