These-knobs-turn-to-11

#!/usr/bin/env bash
RED="\033[0;31m"
BLUE="\033[0;34m"
PURPLE="\033[0;35m"
CYAN="\033[0;36m"
WHITE="\033[0m"
GREEN="\033[0;32m"
YELLOW="\033[0;33m"
DATESTRING=$(date +%m%d%y)&& export DATESTRING
_STARTTIME=$(/bin/date +%s) && export _STARTTIME
runningTime(){
  _NOW=$(/bin/date +%s)
  echo -e "$(( _NOW - _STARTTIME  ))"
}
convertsecs(){
 #take an int which is a number of seconds (IE:
 # now=$(date %s) ; sleep 30; newer_now=$(date %s); age=(${newer_now)-${now}) ; info "This took: $(convertsecs $age)"
 # ^^^^^---- untested example
 ((h=${1}/3600))
 ((m=(${1}%3600)/60))
 ((s=${1}%60))
 printf "%02d:%02d:%02d\n" ${h} ${m} ${s}
}
error(){
  MSG="$1"
  _time=$(convertsecs "$(runningTime)")
  echo -e "${RED}[${_time}] ERROR${WHITE}: ${MSG}${WHITE}" >>/dev/stderr
}

warn(){
  MSG=$1
  _time=$(convertsecs "$(runningTime)")
  echo -e "${YELLOW}[${_time}] WARN${WHITE}: ${MSG}${WHITE}" >>/dev/stderr
}
eveysays(){
  MSG=$1
  echo -e "🐶${PURPLE}. o 0 ${CYAN}(❤️🐾 ${WHITE}${MSG}${WHITE} 🐾❤️${CYAN})"
}
wolfsays(){
  MSG=$1
  echo -e "🐺${YELLOW} . o O (${WHITE}${MSG}${YELLOW})${WHITE}"
}
jackasssays(){
  MSG=$1
  echo -e "🤡${CYAN} . o O ( ${GREEN}${MSG}${CYAN} )${WHITE}"
}
info(){
  MSG=$1
  _time=$(convertsecs "$(runningTime)")
  echo -e "${WHITE}[${CYAN}${_time}${WHITE}]${GREEN} INFO${WHITE}: ${MSG}${WHITE}" >>/dev/stderr
}
isDarwin(){
  _HW=$(sysctl -n kern.ostype 2>/dev/null||echo not.a.mac)
  if  [[ "${_HW}" == "Darwin" ]]; then
    echo 0
  else
    echo -1
  fi
}
isAppleSilicon(){
  _AC="$(sysctl -n machdep.cpu.brand_string |sed  -e 's/[\)\(@ ._-]/_/g' -e 's/__/_/g' -e's/__/_/g'  2>/dev/null||echo no)"
  #shellcheck disable=SC2143
  if [[ $( grep -c "Apple_M" <<< "${_AC}" ) -gt 0  ]]; then
    #returncode is 1 if the output DOES NOT match 'Apple_M'
    echo 0
  else
    echo -1
  fi
}
totalRam(){
  #shellcheck disable=SC2005
  echo "$(sysctl -n hw.memsize 2>/dev/null||echo 0)"
}
hasMemToUse(){
  if [[ "$(totalRam)" -gt 1159049 ]]; then
    #1159049/1024/1024/32*29=1.001 we will come up with at LEAST a value of 1.
    echo 0
  else
   echo -1
  fi
}
divineGPURamLimit(){
  if [[ $(hasMemToUse) ]]; then
    
    echo $(( $(totalRam)*29/1024/1024/32 ))
  else
    error "Not enough memory in system. my math ain't mathin."
    return 1
  fi
}
if [[ $(isDarwin) == 0 ]]; then
  _Q=$(isAppleSilicon)
  if [[ $(isAppleSilicon) == 0 ]]; then
    _SYSCTLVAL="$(divineGPURamLimit)"
    _HUMAN_MAX="$(( $(totalRam)/1024/1024/1024))"
    _HUMAN_GPUVAL="$(( _SYSCTLVAL/1000 ))"
    info "Running on ${CYAN}$(sysctl -n machdep.cpu.brand_string)${WHITE} with ${GREEN}${_HUMAN_MAX}G${WHITE} unified ram."
    wolfsays "This is probably a ${RED}really${WHITE} bad idea."
    jackasssays "YOU'LL BE FINE!!! ${WHITE}He's just being melodramatic\r\n\t \
    Your system has ${_HUMAN_MAX}G of ram.\r\n\t \
    We ${YELLOW}should ${WHITE}be able to safely use ${GREEN}${_HUMAN_GPUVAL}${WHITE} for IOGPU memory."
    wolfsays "To do this, first enable dynamic lowwatermark by typing the following command and entering your password\r\n\t \
    ${YELLOW}This is necessary, as tweaking these knobs requires administrative privilege."
    sleep 1
    info  "[${YELLOW}TYPE THE FOLLOWING COMMAND IN A TERMINAL SESSION${WHITE}]\r\n\r\n${CYAN}sudo sysctl iogpu.dynamic_lwm=1\r\n"
    wolfsays "Then, adjust the following GPU-scoped system configuration knobs"
    info "[${YELLOW}TYPE THE FOLLOWING COMMAND IN A TERMINAL SESSION${WHITE}]\r\n\r\n${CYAN}for KEY in 'wired_limit_mb' 'rsrc_limit'; do SYSCTL=\"iogpu.\${KEY}\"; sudo sysctl \"\${SYSCTL}\"=${_SYSCTLVAL};done\r\n"
    wolfsays "You should be able to start your tool and enjoy a bit more usable space."
    jackasssays "you said ${BLUE}TOOL${GREEN}"
    wolfsays "**sigh**"
    eveysays "${YELLOW}CAUTION${WHITE}:\r\n\tYou ${RED}will${WHITE} want to kill everything other than the tool necessary\r\n\t${YELLOW}Tweaking these knobs with other programs running may crash your system.\r\n\t${BLUE}Good Luck!\r\n\t${PURPLE}Remember to be spontaneously nice to someone today, eh? I'm watching....\r\n"
  else
    eveysays "Sorry, friend... this 🍎 kluge is only relevant to Macs with Apple Silicon Hardware"
  fi
else
  error "This isn't a change that can be performed on non-apple hardware. Nothing to do"
fi