X-Git-Url: https://git.realraum.at/?p=homepage.git;a=blobdiff_plain;f=src%2F_posts%2F2016-02-10-light-in-realraum-is-now-faster.md;fp=src%2F_posts%2F2016-02-10-light-in-realraum-is-now-faster.md;h=0ca8dd915bc8eccbcac2b8aa8a518e79ddbb9bb7;hp=0000000000000000000000000000000000000000;hb=afbb02fc33e2a7afc03c52d3293778510394b57e;hpb=8828a2e98fffe3a3e952d1841bbc0579710a269c

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+---
+id: 474
+title: Light in realraum is now faster
+date: 2016-02-10T06:28:54+00:00
+author: xro
+layout: post
+guid: http://wp.realraum.at/?p=474
+permalink: /2016/02/light-in-realraum-is-now-faster/
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+categories:
+  - english
+  - Projekte
+---
+[licht.realraum.at](http://licht.realraum.at "licht.realraum.at"), went FTLw today. That is… it became much Faster Than Last week. :-)
+
+Since the Raspbian image upgrade and move to a bigger (but slower) SDcard, licht.realraum.at had become truly sluggish. To the point that pressing a button to turn on the light or change the stereo volume could take up to 6 seconds until something happened. (Obviously we disabled the swap-file long ago.)
+
+The problem was quickly identified. Processes don’t load quickly enough.
+  
+The fact that the whole systems was a dunghill of bashscript cgi-scripts and python helper scripts also did not help. At all.
+
+**First attempt** to rectify this: rewrite the python helper rf433ctl.py. Formerly it was a simple script that would be called by the cgi-script and send the appropriate bytes down to the teensy.
+  
+Each call to it, however now took forever. So. I rewrote it as a daemon that would constantly stay in memory and be nudged by other instances of it via RPC. The idea being, if it’s already completely in memory, loading a second instance should be faster. Right? Wrong!. Unfortunately that did not work out at all.
+
+**Second attempt** to rectify this: Remove the kiosk functionality and thus memory-hog midori from licht. Thankfully a very nice person gifted us a RaspberryPi per (almost) anonymous letter, so we had the necessary hardware on-hand to split the functionality onto two separate boxes: [`licht.realraum.at`](http://licht.realraum.at "licht.realraum.at") and `smallkiosk.realraum.at`
+  
+Unfortunately, even freeing up 60% of memory did not even put a dent into the problem.
+
+So.. **third and last attempt**. Hit it with go ;-> In a 3 hour session, I rewrote the whole dunghill as a [monolithic golang daemon/webserver/tty-handler](https://github.com/realraum/deckenlichtschalter/tree/master/linux/golightctrl) which, once loaded, always stays in memory. Then I got rid of lighthttpd and the python scripts. Result&#8230; Speedup from 6s to <=0.05s !! Should have done this right away really&#8230;
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