Raspberry Pi & Other SBC Computers Discussion Thread :)

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Profile CyborgSam
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Message 2020732 - Posted: 27 Nov 2019, 8:19:51 UTC - in response to Message 2020618.  

LIke Martin pointed out, headers can be stacked and there are cables. Once I get the new RPi-4 setup I'll decide how to attach the SenseHAT.

On my RPi-3s, I had to use an extended header to get the SenseHATs high enough to clear the Miuzei case.
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Message 2021074 - Posted: 29 Nov 2019, 16:28:19 UTC

For literally a Raspberry Pi 4 update:


Thermal testing Raspberry Pi 4

Raspberry Pi 4 just got a lot cooler! The last four months of firmware updates have taken over half a watt out of idle power and nearly a watt out of fully loaded power...



At first glance, a half Watt or even a full one Watt of power saving doesn't sound like much, until you consider the very few Watts being used in the first place!

Good cool stuff. Time to do an update??!


Happy cool crunchin',
Martin
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Message 2021078 - Posted: 29 Nov 2019, 16:37:55 UTC - in response to Message 2021074.  

For literally a Raspberry Pi 4 update:


Thermal testing Raspberry Pi 4

Raspberry Pi 4 just got a lot cooler! The last four months of firmware updates have taken over half a watt out of idle power and nearly a watt out of fully loaded power...



At first glance, a half Watt or even a full one Watt of power saving doesn't sound like much, until you consider the very few Watts being used in the first place!

Good cool stuff. Time to do an update??!


Happy cool crunchin',
Martin


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Message 2021117 - Posted: 29 Nov 2019, 22:10:18 UTC - in response to Message 2020732.  

The new RPi4 is up & running. The ICE Tower really keeps it cool. At 100% load the CPU is at 40C. My RPi3s run about 60C and my overclocked RPi4 about 80C (all have fans).

I got the SenseHAT mounted using one small extender and three long ones. It looks odd sitting so high above the RPi. Since the SenseHAT uses all the GPIO pins, I chose to power the fan from USB. I cut up an old USB cable and add two pins from a cut-up header extender. One side-effect is that the fan doesn't turn on until Raspbian activates the USB ports.

I tried overclocking this RPi4 with the same settings as my other RPi4 but it hung on boot (typical symptom). I'll have to try smaller increments.
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Message 2021164 - Posted: 30 Nov 2019, 7:47:48 UTC - in response to Message 2021117.  

I played with overclocking my two Raspberry Pi 4s. So far the best stability I found are these settings (added to /boot/config.txt in the [pi4] section):
over_voltage=4
arm_freq=2000
gpu_freq_min=500
gpu_freq=500

I found setting over_voltage > 4 and/or arm_freq > 2000 caused the RPi4s to hang.

Both RPi4s were more stable after I left the gpu_freq at the default 500 and also set gpu_freq_min to 500. Since SETI doesn't use the RPi4's GPU I see no reason to speed up the GPU.

Without overclocking both RPi4s Geekbenched at about 4850. With the settings above the hotter RPi4 Geekbenched at 5900 and the one with the ICE Tower at 6100. That's a 22-26% increase. I have a second ICE Tower on order for the hot RPi4.

I got the ICE Tower RPi4 to run at 2140 MHz with over_voltage=6, it Geekbenched at 6570, a 35% increase. Unfortunately it hung too often. Such is life on the bleeding edge...

I'll make a throw-away MicroSD to see if I can't tweak a bit more speed out of the RPi4s.

FYI: for overclocking I strongly recommend setting up the MicroSD using NOOBS. This leaves a FAT32 partition containing /boot. When overclocking settings hang the RPi4, I pull the plug, put the MicroSD card in my Mac, edit /boot/config.txt, put the MicroSD card back in the RPi4, and try again.
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Message 2021173 - Posted: 30 Nov 2019, 11:28:47 UTC - in response to Message 2021164.  


I'll make a throw-away MicroSD to see if I can't tweak a bit more speed out of the RPi4s.

FYI: for overclocking I strongly recommend setting up the MicroSD using NOOBS. This leaves a FAT32 partition containing /boot. When overclocking settings hang the RPi4, I pull the plug, put the MicroSD card in my Mac, edit /boot/config.txt, put the MicroSD card back in the RPi4, and try again.


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Message 2021199 - Posted: 30 Nov 2019, 17:46:29 UTC

High-resolution display output or Wi-Fi: It seems you can only choose one on Raspberry Pi 4
Users of the Raspberry Pi 4 mini computer are puzzling over an issue where setting some display resolutions have the side-effect of killing the Wi-Fi connection.

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Message 2021230 - Posted: 30 Nov 2019, 23:10:13 UTC - in response to Message 2021199.  

The RPi 4s have a few hardware glitches, they're not rock solid like the 3s. I don't bother with WiFi since mine sit near my Ethernet switch. In addition, mine run headless at 1440x900 so I wouldn't run into the WiFi glitch.

One glitch that's disconcerting is when the RPi4 is powered on, the SenseHAT's LEDs shine so bright they look like a flash. The SenseHAT then displays its startup gradient, which goes black once the SenseHAT's driver loads.
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Message 2021287 - Posted: 1 Dec 2019, 6:00:07 UTC - in response to Message 2021230.  
Last modified: 1 Dec 2019, 6:03:29 UTC

Bottom line: My ICE Tower cooled RPi4 Geekbenches at a 33% increase over out-of-the-box! It's running with over_voltage=5 and arm_freq=2100.

I searched and found some commonality among Raspberry Pi 4 overclockers. The practical cpu limit is arm_freq=2000, anything over is silicon lottery. The same appears to be true for over_voltage=5 (6 is the limit without voiding the warranty).

Some people used decimal values for over_voltage, e.g. 4.5. My interpretation of RPi's Overclocking options in config.txt is that decimal values aren't significant.

My experience showed that the GUI hung more when I increased gpu_freq. As I mentioned, SETI doesn't use this GPU and I run headless at 1440x900, so the standard GPU speed is fine.

My other RPi4 is running rock solid for over a day with over_voltage=4 and arm_freq=2000. I'll try increasing it after I install its soon-to-arrive ICE Tower.

Here's an interesting quirk I haven't investigated. Doing an lscpu gives what appear to be non-deterministic results:
freq lscpu
---- ---------
2000 2000.0000
2050 2194.9670
2100 2294.9670
2147 2294.9670

My RPi4 hung at 2147 but not at 2100. My guess is there really is a difference despite what lscpu shows.
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Message 2022692 - Posted: 11 Dec 2019, 1:40:11 UTC
Last modified: 11 Dec 2019, 1:40:30 UTC

The RasPi gets another rapid respin for Ubuntu:


Ubuntu 19.10.1 Released For Raspberry Pi

Ubuntu 19.10.1 has been released as an unscheduled re-spin of Ubuntu 19.10 ... for Raspberry Pi 2 / 3 / 4 ARM single-board computers...



Includes OS images for all of the RasPi boards, plus 64-bit for the RasPi3 and RasPi4.

(Note, the usual OS for the RasPi is the Debian based Raspbian which is 32-bit only thus far.)


Happy cool crunchin',
Martin
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Message 2022755 - Posted: 11 Dec 2019, 13:02:45 UTC - in response to Message 2022692.  

The RasPi gets another rapid respin for Ubuntu:


Ubuntu 19.10.1 Released For Raspberry Pi

Ubuntu 19.10.1 has been released as an unscheduled re-spin of Ubuntu 19.10 ... for Raspberry Pi 2 / 3 / 4 ARM single-board computers...



Includes OS images for all of the RasPi boards, plus 64-bit for the RasPi3 and RasPi4.

(Note, the usual OS for the RasPi is the Debian based Raspbian which is 32-bit only thus far.)


Happy cool crunchin',
Martin


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Message 2023428 - Posted: 17 Dec 2019, 2:06:11 UTC

Another cool(ing) add-on for the RasPi4:


CooliPi 4B Is The Best Raspberry Pi 4 Heatsink We Have Tested Yet

While the Raspberry Pi folks have been making thermal/power improvements to the Raspberry Pi 4 firmware, running this budget-friendly ARM single board computer with a heatsink or some form of cooling is certainly recommended...



Good quietly cool colourful stuff!

(Shame about the price!!)


Happy cool crunchin',
Martin
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Message 2027869 - Posted: 16 Jan 2020, 2:52:52 UTC

A new case for the Raspberry Pi 4, it has both passive and active cooling, with a script to monitor CPU temps and spin up fan speed when needed.

The Argon 1:
https://www.youtube.com/watch?v=8VlE654abDo

I also like how all ports are on one side & the case has a power/reset button.
~Chris

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Message 2027919 - Posted: 16 Jan 2020, 13:14:47 UTC - in response to Message 2027869.  

A new case for the Raspberry Pi 4, it has both passive and active cooling, with a script to monitor CPU temps and spin up fan speed when needed.

The Argon 1:
https://www.youtube.com/watch?v=8VlE654abDo

I also like how all ports are on one side & the case has a power/reset button.



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Message 2029911 - Posted: 30 Jan 2020, 18:04:18 UTC

For a curiosity:


Dev Brings Windows 10 to Raspberry Pi 4


Enjoy!
Martin
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Message 2029935 - Posted: 30 Jan 2020, 18:57:45 UTC - in response to Message 2029911.  

For a curiosity:


Dev Brings Windows 10 to Raspberry Pi 4


Enjoy!
Martin

Hi Martin,

I would not contaminate or dishonor a Pi, whether 3 or 4, with anything from Micro$oft! ;) Those Micro$oft fanboys can ruin their Pis all they want. :)

Besides that, I don't know of a Winders version of BOINC for the Pi. Do You?

Have a great day! :)

Siran
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Message 2030319 - Posted: 1 Feb 2020, 15:30:35 UTC

Greetings,

I went into Remmina to check the uptime of my Pis. Everything gives me the following error: Failed to fork (Cannot allocate memory). Even Shutdown and Terminal gives the error. The only solution to this, that I can think of, is to just cut power to the Pis and reboot them. Only 2 of the 3 Pis gives this error.

Any ideas before I do the drastic?

Have a great day! :)

Siran
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Message 2030381 - Posted: 1 Feb 2020, 21:22:03 UTC - in response to Message 2030319.  
Last modified: 1 Feb 2020, 21:34:09 UTC

Some process is leaking memory and you ran out. Reboot the Pis and all will be well.
[Edit] Or you have run out of disk space.
[Edit 2] Try running
ulimit -a
to see if you have too low a limit on user processes or whatever.
Seti@Home classic workunits:20,676 CPU time:74,226 hours

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Message 2030384 - Posted: 1 Feb 2020, 22:14:48 UTC - in response to Message 2030381.  
Last modified: 1 Feb 2020, 22:20:50 UTC

Some process is leaking memory and you ran out. Reboot the Pis and all will be well.
[Edit] Or you have run out of disk space.
[Edit 2] Try running
ulimit -a
to see if you have too low a limit on user processes or whatever.

Hi Keith,

I'll have to do a hard reboot. Terminator... err, Terminal won't fire up, nothing will. I'll let you know what that command tells me. :)

Have a great day! :)

Siran

[edit] This is what it tells me. No clue...:
pi@Rasbpi-1:~ $ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 7345
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 7345
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
pi@Rasbpi-1:~ $

[/edit]
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Message 2030403 - Posted: 1 Feb 2020, 23:22:36 UTC
Last modified: 1 Feb 2020, 23:24:16 UTC

My Pi 3 gives
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 7314
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 65536
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 95
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 7314
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

Note the differences in, max locked memory, pending signals, open files, max user processes, real-time priority.
Might be different O/S, other than the max locked memory I don't really see anything, unless the system is having an issue with the priority of real time tasks and they can't get done and out of the way of normal tasks.
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Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :)


 
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