Find processes with large heap regions

find_large_heap.sh

#!/bin/bash

get_heap_size() {
    local pid=$1
    local heap_size=0

    # Read the /proc/[pid]/maps file
    while read -r line; do
        if [[ "$line" == *"heap"* ]]; then
            local start_addr=$(echo "$line" | awk '{print $1}' | cut -d'-' -f1)
            local end_addr=$(echo "$line" | awk '{print $1}' | cut -d'-' -f2)
            local start_dec=$((0x$start_addr))
            local end_dec=$((0x$end_addr))
            local size=$((end_dec - start_dec))
            heap_size=$((heap_size + size))
        fi
    done < "/proc/$pid/maps"

    echo "$heap_size"
}

# threshold in bytes
THRESHOLD=$((100 * 1024 * 1024))  # 100 MB

echo "PID   HEAP SIZE (MB)   COMMAND"
echo "--------------------------------"

for pid in /proc/[0-9]*; do
    pid=$(basename "$pid")
    if [[ -f "/proc/$pid/maps" ]]; then
        heap_size=$(get_heap_size "$pid")
        if [[ "$heap_size" -gt "$THRESHOLD" ]]; then
            # Get the command name
            command=$(cat "/proc/$pid/comm")
            heap_size_mb=$((heap_size / 1024 / 1024))
            printf "%-5s %-15s %s\n" "$pid" "$heap_size_mb" "$command"
        fi
    fi
done