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chore: revise Faq.js (#114)
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@magnus-madsen
magnus-madsen authored Nov 27, 2023
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</Question>

<Answer>
No, but the compiler does have an interactive mode that can be started by passing
the <code>--interactive</code> argument.
Flix has a nascent REPL. It can be started with the <code>repl</code> command.
</Answer>
</QA>

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Why does Flix target the Java Virtual Machine (JVM)?
</Question>
<Answer>
The Java Virtual Machine is a state-of-the-art virtual machine that runs on virtually every
platform, comes with a huge ecosystem of libraries, and supports garbage collection. While not
the ideal target for functional programming languages, due to its absence of tail call
instructions, it is still a strong choice. Moreover, if <a
href="https://openjdk.java.net/projects/loom/">Project Loom</a> (or similar efforts) turn out
successful then the JVM will offer an unbeatable feature set.
The Java Virtual Machine has many attractive features not found on other VMs, including:
<ul>
<li>A state-of-the-art JIT compiler.</li>
<li>Multiple state-of-the-art garbage collectors.</li>
<li>Access to a huge ecosystem of libraries.</li>
<li>A multitude of concurrency primitives including light-weight threads.</li>
<li>Advanced introspection and debugging facilities.</li>
</ul>
</Answer>
</QA>

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elimination
which has some run-time performance cost.
</p>

<p>
Our goal to be faster than any interpreted language and within a few factors of
equivalent functional Scala code.
</p>
</Answer>
</QA>

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</p>

<p>
A simple experiment shows that the compiler runs about <code>20.0x</code> times faster
A simple experiment shows that the compiler runs about <code>4.0x</code> times faster
when warmed up compared to when cold. We estimate that Flix, when warmed up, compiles
around <code>20,000</code> lines of code per second, which we believe to be faster than the
around <code>50,000</code> lines of code per second, which we believe to be faster than the
Scala compiler, but slower than the Java compiler. We take compiler performance
seriously and continuously track the <a href="https://arewefast.flix.dev/">performance of
the compiler</a>.
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</Question>
<Answer>
<p>
Compiler throughput on an Intel i5-K8600k with 16GB of RAM.
Compiler throughput on an AMD Ryzen 9 5900x with 12 cores and 32GB memory.
</p>

<p>
Experimental results from the 30th of May 2020.
Experimental results from the 27th of November 2023.
</p>

<Table striped>
<thead>
<tr>
<th className="text-center" style={{"width": "20%"}}>Threads</th>
<th className="text-left" style={{"width": "20%"}}>What</th>
<th className="text-right">Threads</th>
<th className="text-right">Throughput (lines/sec)</th>
<th className="text-right">Ratio</th>
</tr>
</thead>
<tbody>
<tr>
<td className="text-center">1</td>
<td className="text-right">9,673</td>
<td className="text-left">Entire Compiler</td>
<td className="text-right">1</td>
<td className="text-right">12,062</td>
<td className="text-right">1.0x</td>
</tr>
<tr>
<td className="text-center">2</td>
<td className="text-right">14,482</td>
<td className="text-right">1.5x</td>
</tr>
<tr>
<td className="text-center">3</td>
<td className="text-right">17,100</td>
<td className="text-right">1.8x</td>
<td className="text-left">Entire Compiler</td>
<td className="text-right">24</td>
<td className="text-right">56,632</td>
<td className="text-right font-weight-bold">4.7x</td>
</tr>
<tr>
<td className="text-center">4</td>
<td className="text-right">18,722</td>
<td className="text-right">1.9x</td>
</tr>
<tr>
<td className="text-center">5</td>
<td className="text-right">20,118</td>
<td className="text-right">2.1x</td>
<td className="text-left">Compiler Frontend</td>
<td className="text-right">1</td>
<td className="text-right">19,191</td>
<td className="text-right">1.0x</td>
</tr>
<tr>
<td className="text-center">6</td>
<td className="text-right">21,052</td>
<td className="text-right">2.2x</td>
<td className="text-left">Compiler Frontend</td>
<td className="text-right">24</td>
<td className="text-right">112,898</td>
<td className="text-right font-weight-bold">5,9x</td>
</tr>
</tbody>
</Table>
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</Answer>
</QA>

<QA>
<Question>Wait, division by zero is zero, really?</Question>

<Answer>
Yes. But focusing on this is a bit like focusing on the color of the seats in a spacecraft.
</Answer>
</QA>

<QA>
<Question>
Who works on Flix? Is Flix a hobby project?
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</Answer>
</QA>

<QA>
<Question>Wait, division by zero is zero, really?</Question>

<Answer>
Yes. But focusing on this is a bit like focusing on the color of the seats in a spacecraft.
</Answer>
</QA>

<QA>
<Question>
You do not seem to understand parsing / type theory / code generation / computers!
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