Dear community, I want to share with you an expereince which I made and how I solved it. I am using openhab since some years now. With openhab 2.0 and 2.5 on raspberry pi 3 and 4 I noticed very often a delay of several second (4-6s) whan I call a rule. I searched since a long time for a solution. …

After the hard discussion which I forced with this thread about log2ram and zram I switched to a cheap 120GB SSD to replace my SD card. Its running for a few weeks now and the delays are also gone… Very nice solution and small investment. I don’t use log2ram and zram anymore to lower the risk of co…

i use 2.5.x on rpib3+ (many..) run fast even with 100+ rules but the swapfree is near 0% ! memory free is arround 30%, i’m worrie about the sd cart fail … zarm is really a way to go ?

This is interesting. I also see delay in rule triggering. Do you simply install the zram-swap-config as explained on github or are there additional steps?

Yes @SpaceGlider , first I installed log2ram (I assume this has no big influence) than zram like discribed on GitHub. I think main step was to disable swaping at the end of the description: sudo systemctl disable dphys-swapfile But I did not experiment arround which step finally made the difference…

@isoparme : If you don’t have an issue at all I would not change something. I installed log2ram to protect my SD card. zram does not help here, I think.

Another option, if you have concerns about the SD card, is to use an SSD. The price for a small SSD and case is cheap enough that I can never see me going back to using an SD card. :grinning: I use a 120GB SSD that my Rpi 3 B+ boots from and have the SD card removed. OH works great on this and if i…

Sorry guys I started this thread because of 4-5s delays in rule excecution. Not because of fear about my SD card… :slight_smile:

[image] olialb: I started this thread because of 4-5s delays in rule excecution. Forgot to mention SSD helped with this also. :wink:

@H102 , Yes I agree! Did this on my second raspberry with nextcloud on it and its much faster now. But on my openhab I don’t see a need for a SSD. The CPU is ideling arround most of the time. So why spending that effort.

[image] olialb: With this project comes also the recommedation to install GitHub - StuartIanNaylor/zram-swap-config: Replacement for broken zram-config-0.5 package and disable raspbian file swap services . ZRAM is already a feature of openHABian, why don’t you just use it ?

@mstormi Just because, I did not know. Thanks for the hint! Is there any reason why its not active by default?

Delay in openhab reaction time with openhabian on PI3/4 caused by file swap service?

Hardware Server

mstormi (Markus Storm) April 25, 2020, 6:29pm 10

ZRAM is already a feature of openHABian, why don’t you just use it ?