My ARM fleet

[Dirk Broer]

For those of us that have 64-bit Linux/ARM systems and that want to crunch 32-bit apps here as reminder

Your 64-bit OS has standard no 32-bit libraries! ARMv8.0-A and ARMv8.2-A systems -and quite likely any other ARMv8.x-A- can be 'tricked' into accepting 32-bit work though by this command-line 'hacking' (debian-style):

sudo dpkg --add-architecture armhf
sudo apt update --fix-missing
sudo apt dist-upgrade
sudo apt install libc6:armhf libstdc++6:armhf zlib1g:armhf libfuse2:armhf libgomp1:armhf libboinc7:armhf

to be sure you get all, edit your cc_config.xml to have these lines on a ARMv8 system:

<cc_config>
    <options>
        <alt_platform>arm-unknown-linux-gnueabihf</alt_platform>
        <alt_platform>armv7l-unknown-linux-gnueabihf</alt_platform>
    </options>
</cc_config>

Mind you: with the newest and latest upcoming ARMv9 SOCs running 32-bit taks will no longer be possible! (only applies when you are crunching on the very latest high-end smartphones: Cortex-A510, Cortex-A710, Cortex-A715, Cortex-X2, Cortex-X3, Neoverse N2, Neoverse V2)

If you run a 64-bit OS on a Raspberry Pi 3, or a 4 with 1 or 2 GB of RAM (perhaps even with 4GB), be sure to install ZRAM as well:
add the following lines to /etc/sysctl.conf (and then enable in real-time with the appropriate commands.)

vm.vfs_cache_pressure=500
vm.swappiness=100
vm.dirty_background_ratio=1
vm.dirty_ratio=50

To enable these settings temporarily without rebooting, use the following commands:

sudo sysctl -w vm.swappiness=100
sudo sysctl -w vm.vfs_cache_pressure=500