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    <p>I admit that before today, I had never heard of Factor. I took the opportunity to play with it. It is looking nice (reminds me of squeak-vm and lisp at the same time). I'll cut the <em>smalltalk</em> (pun very much intended) and jump to your question.</p> <h3>Analysis</h3> <p>It appears that the way Factor works, results in loading vocabularies being slow. </p> <p>I compiled Factor on my 64 bit quadcore linux system (from git revision <a href="http://gitweb.factorcode.org/gitweb.cgi?p=factor;a=shortlog;h=60b11154526aa9bd2896808f2e19e30b50e44bb5" rel="noreferrer"><code>60b1115452</code></a>, Thu Oct 6). Putting everything on <a href="http://en.wikipedia.org/wiki/Tmpfs" rel="noreferrer">tmpfs</a> the build dir takes 641Mb, of which 2x114Mb is in the factor.image and it's backup (factor.image.fresh).</p> <p>When <a href="http://linux.die.net/man/1/strace" rel="noreferrer"><code>strace</code></a>-ing the calculator app loading, there is a huge list of factor files being loaded: </p> <ul> <li><strong>3175</strong> factor files are touched. </li> <li>compilation of these takes roughly <strong>30 seconds</strong> on my box</li> <li>the memory usage maxes out on just under <strong>500Mb</strong> (virtual) and 300Mb reserved set</li> </ul> <blockquote> <p><em>I'm strongly suspecting your box is low on memory, and might be getting very swappy</em> <br/><sub>This would definitely explain compilation taking 5 minutes</sub></p> </blockquote> <p>Can you confirm whether this is the case (likely if you are running some kind of shared host or VPS appliance). If you run a virtual machine, consider increasing the available system memory.</p> <hr> <h2>Saving Heap Images (snapshots)</h2> <p>I already mentioned the factor.image file (114Mb) before. It contains a 'precompiled' (bootstrapped, actually) <em>heap image</em> for the Factor VM. All operations in the VM (working on the UI listener or compiling <em>factor</em> files) affects the heap image.</p> <p>To avoid having to recompile your source files time and time again, you can save the end-result into a custom heap image:</p> <p><a href="http://docs.factorcode.org/content/article-images.html" rel="noreferrer">http://docs.factorcode.org/content/article-images.html</a></p> <blockquote> <h3>Images</h3> <p>To start Factor with a custom image, use the -i=image command line switch; see <a href="http://docs.factorcode.org/content/article-runtime-cli-args.html" rel="noreferrer">Command line switches for the VM</a>.</p> <p>One reason to save a custom image is if you find yourself loading the same libraries in every Factor session; some libraries take a little while to compile, so saving an image with those libraries loaded can save you a lot of time.</p> <p>For example, to save an image with the web framework loaded,</p> <pre><code>USE: furnace save </code></pre> </blockquote> <p>New images can be created from scratch: <a href="http://docs.factorcode.org/content/article-bootstrap.image.html" rel="noreferrer">Bootstrapping new images</a></p> <h2>Deploying applications</h2> <p>Saving heap images results in files that will (typically) be bigger than the original bootstrap image. </p> <p>The <a href="http://docs.factorcode.org/content/article-tools.deploy.html" rel="noreferrer">Application deployment tool</a> creates stripped-down images containing just enough code to run a single application</p> <blockquote> <p>The stand-alone application deployment tool, implemented in the <a href="http://docs.factorcode.org/content/vocab-tools.deploy.html" rel="noreferrer">tools.deploy</a> vocabulary, compiles a vocabulary down to a native executable which runs the vocabulary's <a href="http://docs.factorcode.org/content/word-MAIN__colon__,syntax.html" rel="noreferrer">MAIN:</a> hook. Deployed executables do not depend on Factor being installed, and do not expose any source code, and thus are suitable for delivering commercial end-user applications.</p> <p>Most of the time, the words in the <a href="http://docs.factorcode.org/content/vocab-tools.deploy.html" rel="noreferrer">tools.deploy</a> vocabulary should not be used directly; instead, use <a href="http://docs.factorcode.org/content/article-ui.tools.deploy.html" rel="noreferrer">Application deployment UI tool</a>.</p> <p>You must explicitly specify major subsystems which are required, as well as the level of reflection support needed. This is done by modifying the deployment configuration prior to deployment.</p> </blockquote> <h2>Concluding</h2> <p>I expect you'll benefit from (in order of quickest win):</p> <ul> <li>increasing available RAM <sub><sup>(only quick in virtual environments...)</sup></sub></li> <li>saving a heap image with <blockquote> <pre><code>USE: db.sqlite USE: furnace.alloy USE: namespaces USE: http.server save </code></pre> <p>This step brought the compilation on my system <strong>down from ~<code>30s</code> to <code>0.835s</code></strong></p> </blockquote></li> <li>deploying the calculator webapp to a stripped heap image (refer to the <a href="http://gitweb.factorcode.org/gitweb.cgi?p=factor;a=blob_plain;f=extra/webapps/calculator/calculator.factor;hb=HEAD" rel="noreferrer">source</a> for deployment hints)</li> </ul> <p>In short, thanks for bringing Factor to my attention, and I hope my findings will be of any help, Cheers</p>
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    1. COSwapping might just be the reason. Even when only running several pages in Google Chrome I'm already using up a few bytes of swap. Thanks a lot for the in-depth answer, it was a joy and and inspiration to read.
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    2. CO@YamMarcovic: thanks. Did you try the `save` image way? In retrospect _that_ is even easier than expanding memory (but you might still want to do that :)) _It brought down the compile time to 0.8s when I tried it_
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