smurphy
Full Member
Posts: 169
Raspberry Pi: Yes
Other Device: many ...
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Post by smurphy on Sept 23, 2020 0:56:54 GMT -8
hi all,
just a little report of my experience with the Raspberry PI Zero W as host for the Weather station, and overrall load and stuff.
So - in the beginning I had the SkyWeather.py send the data to a remote database, and had the PI send the cpatured image to my website for postprocessing befor publishing it. The result was that this induced a strain which cause issues. In the end, I added a small writeWeatherStatsCSV function into SkyWeather.py to dump all data into the SDL_*/static directory as CSV line. That's the directory the picture is dumped. What I did then, is make sure the skycam picture is updated all 15 Minutes only.
I then installed lighthttpd onto the PI, and poll the CSV file once every minute, and the camera picture once every 15minutes.
What this changed, is that the python script dumping megabytes of binary junk onto the console (nohup) logs are gone.
The transmission errors are gone too (realize that the camera picture alone caused 2 Gbytes transfered data/week) because sometimes one skycam transfer was not done when next was initiated.
The lighthttpd is configured to service static files only, and only from the static directory in http mode (Encryption not required). It is weather data only after all.
I'll check how that setup works, and will in future concentrate on the metric-over time display graphs a little more (when time permits).
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Post by Jason on Sept 24, 2020 7:02:19 GMT -8
This is a very timely posting so thank you in advance. If you don't mind me asking, how did you measure memory utilization on your RPi Zero W?
Thanks,
Jason
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smurphy
Full Member
Posts: 169
Raspberry Pi: Yes
Other Device: many ...
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Post by smurphy on Sept 25, 2020 5:16:11 GMT -8
Check out the Monitoring site: stargate.solsys.org/mod.php?mod=systat&op=list&host=11End of the page is the memory consumption. it is a bad timing, as I have added some patches to SkyWeather.py (for maintaining the Rain-status over reboot) I made a mistake and broke all reported data. So I wiped the rrd files holding the long-time data. Makes it impossible to see the the gain right now  What you can see though, is that the free memory is constantly "dropping", indicating that there is a memory leak. As the only services that are running right now, are the python SkyWeather script, and the lighthttpd service static pages with cache disabled (outside from the system tools like cron), changes to memory consumption are very easily visible. Note that I use a stripped down OS as describe here: stargate.solsys.org/dyntbl.php?mod=docs&upd_menu_id=53&op=View&id=3 |
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Post by Jason on Sept 28, 2020 6:00:33 GMT -8
Thanks for the link on opportunities to shut off unnecessary services. I applied several of those changes to my setup with positive results. More specifically, I'm interested in what library you are using to capture the utilization measurements for system resources. I had originally been using the gpiozero library but have recently switched to psutil and am much happier. Attached is a screenshot of my measurements in Blynk. Thanks, Jason Attachments:
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smurphy
Full Member
Posts: 169
Raspberry Pi: Yes
Other Device: many ...
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Post by smurphy on Sept 28, 2020 23:09:20 GMT -8
I have no library for system utilization resources. I'm using plain old snmpd running on the pi. It returns/extracts all that is required. pi@weatherpi:~ $ ps auxw | grep snmp
Debian-+ 378 0.2 2.9 26556 11292 ? Ss Sep25 13:18 /usr/sbin/snmpd -Lsd -Lf /dev/null -u Debian-snmp -g Debian-snmp -I -smux mteTrigger mteTriggerConf -f -p /run/snmpd.pidIt is very small, uses 11K or resident memory and can be polled by my server from the outside. Just install the "snmpd" and configure it accordingly.
PS: Nice screenshot. I just don't use services where I cannot control my data  So I host all myself  Results may look outdated, but data is there!
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So I host all myself 