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calculate_concurrency() {

MEMORY_AVAILABLE=${MEMORY_AVAILABLE-$(detect_memory 512)}

WEB_MEMORY=${WEB_MEMORY-512}

WEB_CONCURRENCY=${WEB_CONCURRENCY-$((MEMORY_AVAILABLE/WEB_MEMORY))}

if (( WEB_CONCURRENCY < 1 )); then

WEB_CONCURRENCY=1

elif (( WEB_CONCURRENCY > 32 )); then

WEB_CONCURRENCY=32

fi

WEB_CONCURRENCY=$WEB_CONCURRENCY

}

log_concurrency() {

echo "Detected $MEMORY_AVAILABLE MB available memory, $WEB_MEMORY MB limit per process (WEB_MEMORY)"

echo "Recommending WEB_CONCURRENCY=$WEB_CONCURRENCY"

}

detect_memory() {

local default=$1

local limit=$(ulimit -u)

case $limit in

256) echo "512";; # Standard-1X

512) echo "1024";; # Standard-2X

16384) echo "2560";; # Performance-M

32768) echo "14336";; # Performance-L

*) echo "$default";;

esac

}

export PATH="$HOME/.heroku/node/bin:$PATH:$HOME/bin:$HOME/node_modules/.bin"

export NODE_HOME="$HOME/.heroku/node"

export NODE_ENV=${NODE_ENV:-production}

calculate_concurrency

export MEMORY_AVAILABLE=$MEMORY_AVAILABLE

export WEB_MEMORY=$WEB_MEMORY

export WEB_CONCURRENCY=$WEB_CONCURRENCY

if [ "$LOG_CONCURRENCY" = "true" ]; then

log_concurrency

fi