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nerves_bootstrap

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Nerves mix integration bootstrap and new project generator

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nerves_bootstrap templates new rel vm.args.eex
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templates/new/rel/vm.args.eex 

## Customize flags given to the VM: https://www.erlang.org/doc/apps/erts/erl_cmd.html



## Do not set -name or -sname here. Prefer configuring them at runtime

## Configure -setcookie in the mix.exs release section or at runtime



## Number of dirty schedulers doing IO work (file, sockets, and others)

##+SDio 5



## Increase number of concurrent ports/sockets

##+Q 65536



## Tweak GC to run more often

##-env ERL_FULLSWEEP_AFTER 10



## Use Ctrl-C to interrupt the current shell rather than invoking the emulator's

## break handler and possibly exiting the VM.

+Bc



## Require an initialization handshake within 10 minutes from the startup guard

## See https://hexdocs.pm/nerves_runtime/readme.html#assisted-firmware-validation-and-automatic-revert

-env HEART_INIT_TIMEOUT 600



# Allow time warps so that the Erlang system time can more closely match the

# OS system time.

+C multi_time_warp



## Choose whether to load all code at system startup

## See https://www.erlang.org/doc/system/system_principles.html#code-loading-strategy

## Slow devices sometimes benefit from choosing embedded mode

##-mode interactive



# Load code as per the boot script since not using archives

# See https://www.erlang.org/doc/man/init.html#command-line-flags

-code_path_choice strict



## Disable scheduler busy wait to reduce idle CPU usage and avoid delaying

## other OS processes. See https://www.erlang.org/doc/apps/erts/erl_cmd.html#+sbwt

+sbwt none

+sbwtdcpu none

+sbwtdio none



## Save the shell history between reboots

## See https://www.erlang.org/doc/apps/kernel/kernel_app for additional options

-kernel shell_history enabled



## Enable heartbeat monitoring of the Erlang runtime system

-heart -env HEART_BEAT_TIMEOUT 30



## Start the Elixir shell



-noshell<%= if Version.match?(System.version(), ">= 1.15.0") do %>

-user elixir

-run elixir <%= if Version.match?(System.version(), ">= 1.17.0"), do: "start_cli", else: "start_iex" %>

<% else %>

-user Elixir.IEx.CLI

<% end %>

## Enable colors in the shell

-elixir ansi_enabled true



## Options added after -extra are interpreted as plain arguments and can be

## retrieved using :init.get_plain_arguments(). Options before the "--" are

## interpreted by Elixir and anything afterwards is left around for other IEx

## and user applications.

-extra --no-halt

--

--dot-iex /etc/iex.exs