I expect it to only have minor effects. A checkpoint file takes about 20kB over here, although it may need a little computation to produce.

At the same time, if you increased the target cpu time, it would need to copy & decompress the gigantic zip file less often. But again, the amortized cost of this should be low.

I wouldn't be surprised if you saved more energy with mount options like `noatime,lazytime,commit=60,max_batch_time=50000` or tweaking the block device, and/or with lzo-compressing btrfs.

Do share your benchmark results with us if you find anything.

thanks good hint, i think i'd add that no atime in the mounts (in fstab) it would significantly reduce writes to sd card
oh ok it seemed noatime is default in Raspbian distribution from www.raspberrypi.org

i'm also getting 4.20 WU, in 4.20 one of the large database files is now made shared in the project directory, that may have an improvement on its own. it is more likely that disk reads will simply become cache hits in memory

There is this system to run 64-bit Debian Buster inside Raspbian Buster 32-bit: https://github.com/sakaki-/raspbian-nspawn-64

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install -y raspbian-nspawn-64
$ sudo reboot
...
...
$ ds64-shell   
pi@debian-buster-64:~ $ sudo apt update
pi@debian-buster-64:~ $ sudo apt upgrade
pi@debian-buster-64:~ $ sudo apt install boinc boinc-client boinc-manager boinctui
pi@debian-buster-64:~ $ sudo service boinc-client start
pi@debian-buster-64:~ $ boinctui

In boinctui you can add projects.

You can also start GUI boincmgr from a Terminal 32-bit using:

$ ds64-runner boincmgr

I couldn't start boincmgr from the start menu. I got Error: Failed to change to directory "/var/lib/boinc-client" (No such file or directory)

This is an improvement of:
https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=271456&hilit=covid&start=25#p1649357

This works to get tasks from Rosetta@home on Pi 4 B 4 GB, but for Pi 3 one might need to do tricks to get more memory:
https://www.reddit.com/r/BOINC/comments/g0r0wa/running_rosetta_covid19_workunits_on_raspberry_pi/

I've not tried BOINC on Raspberry Pi 3.

---

Thanks for the nspawn trick. We've developed the Raspberry Pi 3B+ trick right here on this forum:

- https://boinc.bakerlab.org/rosetta/forum_thread.php?id=13795

reposting here just in case it helps

for Pi4 and the recent Raspbian Buster images, nspawn isn't needed really to run rosatta@home, i ran 'native' it is probably more efficient and saves sd space

i got my clues from here
http://marksrpicluster.blogspot.com/2020/04/do-something-useful-with-your-pi4.html

basically

• install boinc
  

  sudo apt-get install boinc-client

  
  
  
• set 64 bits kernel
  edit /boot/config.txt at end add
  

  arm_64bit=1

  
  
  
• tell boinc-client to use the app for aarch64
  edit /etc/boinc-client/cc_config.xml
  

  <cc_config>
    <options>
      <alt_platform>aarch64-unknown-linux-gnu</alt_platform>
    </options>
  </cc_config>
  

reboot

sudo reboot

and normally things should be started. check with

systemctl status boinc-client.service

of course install either boinc-manager graphical gui

apt-get install boinc-manager

or boinctui

apt-get install boinctui 

to manage the runs. one can also use boinccmd from the command line which doesn't need additional manager gui

ideally take additional steps to get sshd up and running.
i did in addition to get avahi (zeroconf, MDNS) up and running so that i can 'find' it on the lan when it is booted up
one may want to add in cc_config.xml

<options>
  <allow_remote_gui_rpc>1</allow_remote_gui_rpc>
</options>

set the password in /var/lib/boinc/gui_rpc_auth.cfg
install rpi-monitor
https://rpi-experiences.blogspot.com/

apt-get install rpimonitor

and one can run pretty much run 'headless' connect remotely to manage the boinc-client instance and monitor cpu loads and temperature on the web at port 8888 (rpi-monitor). running headless is really conveinent, there is only one cable usb C for power that's all. you can place the pi in a good location with wifi access and well ventilated (it needs a good heat sink or sink fan as well) to dissipate the heat

I don’t know about the rest of you but I control my Pi’s using BOINCtasks where I can see all of the cluster at once. BOINCtasks (BT) is a Windows app, but will run under wine. One of the things BT can show, which BOINC Manager doesn’t easily show, is how much memory each task is using.

I have some instructions I posted on my blog in 2013, but it might be worthwhile updating them, although not much has changed.

---

MarksRpiCluster

reposting here just in case it helps
basically

[list]
* install boinc

sudo apt-get install boinc-client

* set 64 bits kernel
edit /boot/config.txt at end add

arm_64bit=1

*snip*

This is basically my setup as well. However, I also reduce the video memory and set a 2GB Zram swap space and set Boinc to use the extra memory as even the 4GB Pi occasionally runs short of memory with 4 Rosetta processes:

#Reduce memory assigned to GPU:
sudo raspi-config - Advanced Options - Memory split - 16MB

Setup zram:
sudo apt-get install zram-tools
sudo vi /etc/default/zramswap
PERCENTAGE=50 (275 for Pi 3B+)
sudo zramswap stop
sudo zramswap start

#increase swap as a last resort so we don't run out of memory
sudo dphys-swapfile swapoff
sudo vi /etc/dphys-swapfile
CONF_SWAPSIZE=1024
sudo dphys-swapfile swapon

#Edit the Boinc global preferences to use more than 100% of system memory:
sudo vi /etc/boinc-client/global_prefs_override.xml

update xml to:
<global_preferences>
<max_ncpus_pct>100.000000</max_ncpus_pct>
<vm_max_used_pct>90.000000</vm_max_used_pct>
<ram_max_used_busy_pct>175.000000</ram_max_used_busy_pct>
<ram_max_used_idle_pct>175.000000</ram_max_used_idle_pct>
<cpu_usage_limit>100.000000</cpu_usage_limit>
</global_preferences>

boinccmd --read_global_prefs_override

https://rpi-experiences.blogspot.com/

apt-get install rpimonitor

and one can run pretty much run 'headless' connect remotely to manage the boinc-client instance and monitor cpu loads and temperature on the web at port 8888 (rpi-monitor). running headless is really conveinent, there is only one cable usb C for power that's all. you can place the pi in a good location with wifi access and well ventilated (it needs a good heat sink or sink fan as well) to dissipate the heat

I haven't been been using rpi monitor. How much CPU does it have?

I'm currently doing the following to save power on my pi:

Disable HDMI:
sudo tvservice --off

Disable Wifi
echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt

Disable Bluetooth and bluetooth services
sudo systemctl disable hciuart
echo "dtoverlay=disable-bt" | sudo tee -a /boot/config.txt

Turn off Power LED:
echo 0 | sudo tee /sys/class/leds/led1/brightness

Have you done any power testing with Ethernet vs Wifi?

Also, which Heatsink are you using? I've been running passive with the Flirc Aluminum case - it works quite well, but I've found that its VERY easy to give the case a shock and lock up the Pi.

I don’t know about the rest of you but I control my Pi’s using BOINCtasks where I can see all of the cluster at once. BOINCtasks (BT) is a Windows app, but will run under wine. One of the things BT can show, which BOINC Manager doesn’t easily show, is how much memory each task is using.

I have some instructions I posted on my blog in 2013, but it might be worthwhile updating them, although not much has changed.

I've been managing all of my computers individually. I would be very interested to read about some management tools to handle everything from one place.

This is a general problem with the PI4 if you put any load on it, you need to install active cooling. B.t.w. the device will not get killed so easily, when the temperature gets over 80 degrees Celsius, a throttling mechanism comes into play, but running the thing at 80 degrees all the time may adversely affect its longevity, so try to shave off some degrees with a cooler or there's also massive cooling blocks that cover the whole little board.

reposting here just in case it helps
basically
[list]
* install boinc

sudo apt-get install boinc-client

* set 64 bits kernel
edit /boot/config.txt at end add

arm_64bit=1

*snip*

This is basically my setup as well. However, I also reduce the video memory and set a 2GB Zram swap space and set Boinc to use the extra memory as even the 4GB Pi occasionally runs short of memory with 4 Rosetta processes:

#Reduce memory assigned to GPU:
sudo raspi-config - Advanced Options - Memory split - 16MB

thanks for the hint just did that, every byte matters

Setup zram:
sudo apt-get install zram-tools
sudo vi /etc/default/zramswap
PERCENTAGE=50 (275 for Pi 3B+)
sudo zramswap stop
sudo zramswap start

#increase swap as a last resort so we don't run out of memory

i think i'd try zram at a different attempt, i've that nagging feeling that zram would after all 'steal cycles' from the main threads running the wus.
i did have a pretty large swap that is *unused* (very little of it tends to be used), i actually set boinc memory use to 100% both in use and busy.
this over commits some ram into swap. i'm wary of exceeding 100% as the spec as it may imply the actual wu memory blocks being swapped out.

the notion about swap is *unused memory*, i'd imagine that there are various tmpfs mounts and various daemons. if those blocks aren't in use, i'm happy for them to sit in swap.

and i found running 3 threads in 4GB memory leaves some needed margins, large wu runs pretty much at full speeds at 1.75ghz and i tend to get better credits per task returns for similar wu vs 4 tasks concurrently. i reasoned that to be related to cache contention, for 4 threads there may be more cache misses resulting in the threads hitting memory and hence doing wait states for dram access, that slows things down overall. and in addition, i observed, temperature spikes occasionally and cpu loads run high more so than do 3 threads at once. i'd think it is partly happening when transiting between task uploads and setting up and running new tasks.

https://rpi-experiences.blogspot.com/

I haven't been been using rpi monitor. How much CPU does it have?

Rpi-monitor
https://github.com/XavierBerger/RPi-Monitor
basically provides a nice web interface to monitor the system statistics, core temperature, cpu load, memory used
and it draws nice temperature graphs. the temperature graphs has helped me decide on the preferred operating points, e.g. i'd prefer to run at a lower temperature and to get a max credits per task per run period. temperature together with memory and credit considerations is partly how i decided to run just 3 threads instead of 4. i tend to see more credit per task per run period (and more models completed too) running 3 tasks than 4 and there are less temperature spikes running 3.
bigger (memory) tasks tend to simply run quietly without adverse incidences e.g. waiting for memory etc

I'm currently doing the following to save power on my pi:
Disable HDMI:
sudo tvservice --off
Disable Wifi
echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt
Disable Bluetooth and bluetooth services
sudo systemctl disable hciuart
echo "dtoverlay=disable-bt" | sudo tee -a /boot/config.txt
Turn off Power LED:
echo 0 | sudo tee /sys/class/leds/led1/brightness
Have you done any power testing with Ethernet vs Wifi?

oh wow, i did trying tvservice -off, it didn't seem to make much difference (on the temperature graph). Hence, i left that alone.
i'm running on a single cable i.e. power (from usb C), it simply works over wifi, no ethernet.
i've not made power measurements but i'd guess this setup is probably ok for the lower power draw.
i read some forum posts that ethernet can draw quite some currents (like 100ma) if the cable is connected and live.

Also, which Heatsink are you using? I've been running passive with the Flirc Aluminum case - it works quite well, but I've found that its VERY easy to give the case a shock and lock up the Pi.

well here is my setup:
https://boinc.bakerlab.org/rosetta/forum_thread.php?id=13732&postid=95585
that temperature graph there is from rpi-monitor

I have a question for you, according to you, with a Raspberry Pi 4 4GB that works with 3 tasks, what would be the best settings for spot storage? Raspberry Pi no OC which runs 24/7

Here are the settings I put :

Other
           Store at least 0.50    days of work
Store up to an additional 0.10 days of work

i did 0.1 / 0 i.e. don't cache tasks, not so much for storage but so that it won't download a large cache of wu. This helps in case i'd want to shutdown, so that i won't need to cancel lots of tasks. in fact even with near zero cache, i tend to see at least 1 task cached ahead, that's ok at least it isn't a large number of them.

A few more pieces of data.

I used uhubctl to power off the usb on my pi 4 and wired networking continued to work. The Ethernet is not connected to usb in the pi 4 - see this thread:
https://www.raspberrypi.org/forums/viewtopic.php?t=244673

Continuing network power testing, I created a 10 GB file and copied it across the network to my freenas.

Wired: copy took 10 minutes 17 seconds. The network copy took <1watt (my ups did not read a power difference while running the copy. It also does not read different power values with the cable unplugged)

Wireless: when Placed appx 19 inches away from my router, the copy took 17 minutes 53 seconds via my TP Link Archer ac router. Power used was <1watt (my ups did not read different power usage during the copy)

When placed in my office (across my house on a different floor... maybe 50 feet through a wall in addition to the floor), copy used 2w power (measured from a different ups, power measurement is not exact and not completely comparable). Copy took >20 minutes... I forgot to use “time” with the copy command. I can rerun if anyone cares about the time taken for copy.

I now have my newest Pi 4 4GB online. This one seems to be stable at the maximum overclock with these settings:

arm_frequency=2147
over_volt=6

With USB, HDMI, Bluetooth, Wifi, and Power LED turned off, the system is consuming 6W as read from my UPS.

This Pi 4 is in a Flirc case, and is the top of a stack of 3 Pi 4s. A single fan is blowing on the stack. Maximum temp seen so far is 54 C

Host details:
https://boinc.bakerlab.org/rosetta/show_host_detail.php?hostid=4453627

hi, Pi4 has got a new 8GB version, and more importantly 64 bit OS ;)
https://www.raspberrypi.org/blog/8gb-raspberry-pi-4-on-sale-now-at-75/
https://www.raspberrypi.org/forums/viewtopic.php?f=117&t=275370
https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=275372

it seem to be something to try out, it is Beta though,
this is really on the bleeding edge lol

hi, Pi4 has got a new 8GB version, and more importantly 64 bit OS ;)
https://www.raspberrypi.org/blog/8gb-raspberry-pi-4-on-sale-now-at-75/
https://www.raspberrypi.org/forums/viewtopic.php?f=117&t=275370
https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=275372

it seem to be something to try out, it is Beta though,
this is really on the bleeding edge lol

I'll be ordering one today! I don't expect dramatically different performance from the 4GB model, but every once in a while I need more than 4GB of ram for Rosetta.

Does anyone know if there is planned long term support for ARM in Rosetta? I would hate to buy 3 8GB Pis and have support dropped in a few months.

I'll be ordering one today! I don't expect dramatically different performance from the 4GB model, but every once in a while I need more than 4GB of ram for Rosetta.

Does anyone know if there is planned long term support for ARM in Rosetta? I would hate to buy 3 8GB Pis and have support dropped in a few months.

it seemed to be an instant sold out on launch, Pi4s are getting too hot lol
https://shop.pimoroni.com/products/raspberry-pi-4?variant=29157087412307

I'm currently doing the following to save power on my pi:
Disable HDMI:
sudo tvservice --off
Disable Wifi
echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt
Disable Bluetooth and bluetooth services
sudo systemctl disable hciuart
echo "dtoverlay=disable-bt" | sudo tee -a /boot/config.txt
Turn off Power LED:
echo 0 | sudo tee /sys/class/leds/led1/brightness
Have you done any power testing with Ethernet vs Wifi?

I usually blacklist the WiFi and Bluetooth. Not to save power. I have 20 Pi's and I would rather they not use WiFi at all, there wouldn't be much bandwidth left for the other devices. Most of them are Pi3's so are running Einstein work.

cd /etc/modprobe.d
sudo nano raspi-blacklist.conf and add the following
# wifi
blacklist brcmfmac
blacklist brcmutil
# bluetooth
blacklist btbcm

Not sure if they are still correct, I got this from forum posts on raspberrypi.org some years ago. I also remove the pi-bluetooth package.

---

MarksRpiCluster

I'm currently doing the following to save power on my pi:
Disable HDMI:
sudo tvservice --off
Disable Wifi
echo "dtoverlay=disable-wifi" | sudo tee -a /boot/config.txt
Disable Bluetooth and bluetooth services
sudo systemctl disable hciuart
echo "dtoverlay=disable-bt" | sudo tee -a /boot/config.txt
Turn off Power LED:
echo 0 | sudo tee /sys/class/leds/led1/brightness
Have you done any power testing with Ethernet vs Wifi?

I usually blacklist the WiFi and Bluetooth. Not to save power. I have 20 Pi's and I would rather they not use WiFi at all, there wouldn't be much bandwidth left for the other devices. Most of them are Pi3's so are running Einstein work.

cd /etc/modprobe.d
sudo nano raspi-blacklist.conf and add the following
# wifi
blacklist brcmfmac
blacklist brcmutil
# bluetooth
blacklist btbcm

Not sure if they are still correct, I got this from forum posts on raspberrypi.org some years ago. I also remove the pi-bluetooth package.

What is the difference between blacklisting and disabling like in the quoted text?

What is the difference between blacklisting and disabling like in the quoted text?

As far as I know they both do the same thing,

---

MarksRpiCluster