Liux interrupts watcher and list top IRQs

irqtop.py

import time

__doc__ = """This script greps from /proc/interrupts and print the top interrupts of CPU cores and sources.
Super useful for 64+ cores machine, whose /proc/interrupts is totally unreadable.
"""

def get_interrupts_dict():
    cpu_count = 0
    result = {}
    with open('/proc/interrupts') as f:
        for line_num, line in enumerate(f):
            line = line.strip()
            arr = line.split(" ")
            arr = filter(lambda x : x, arr)
            arr = list(arr)
            if len(arr) < 4:
                continue
            if line_num == 0:
                cpu_count = len(arr)
                continue
            key_arr = arr[0:1] + arr[1 + cpu_count:]
            key = " ".join(key_arr)
            values = [int(x) for x in arr[1:1+cpu_count]]
            result[key] = values
    return result


def show_dict_diff_values(dict1, dict2):
    diff_array = []
    for key, value1 in dict1.items():
        if key not in dict2:
            continue
        value2 = dict2[key]
        for i in range(len(value1)):
            diff = value2[i] - value1[i]
            if diff > 0:
                title = "CPU" + str(i) + " - " + key
                diff_array.append((title, diff))
    diff_array = sorted(diff_array, key=lambda x: x[1], reverse=True)
    for title, value in diff_array[:30]:
        print(title, value)


if __name__ == "__main__":
    while True:
        d1 = get_interrupts_dict()
        time.sleep(2)
        d2 = get_interrupts_dict()
        print("=" * 100)
        show_dict_diff_values(d1, d2)