kvm之获取虚拟机资源状况

#! /usr/bin/python
from re import T
import libvirt
import json
import sys
import time

# CPU memory data
def memory_usage(hname='host1',kvmname='vm1'):
    if hname=='host1':
        conn=libvirt.open("qemu+ssh://192.168.43.12/system")
    else:
        conn = libvirt.open("qemu:///system")
    info = {}
    dom = conn.lookupByName(kvmname)
    dom.setMemoryStatsPeriod(10)
    # memory usage
    meminfo = dom.memoryStats()
    free_mem = float(meminfo['unused'])
    total_mem = float(meminfo['available'])
    used_mem = total_mem-free_mem
    mem_usage = round(((total_mem-free_mem) / total_mem)*100, 2)
    info['mem_usage'] = mem_usage
    info['mem_used'] = round(used_mem/1024/1024, 2)
    info['mem_total'] = round(total_mem/1024/1024, 2)
    info['mem_free'] = round(free_mem/1024/1024, 2)
    return json.dumps(info['mem_usage'])
# while(True):
#     print(memory_usage())


# CPU memory data
def cpu_usage(hname='host1',kvmname='vm1'):
    if hname=='host1':
        conn=libvirt.open("qemu+ssh://192.168.43.12/system")
    else:
        conn = libvirt.open("qemu:///system")
    info = {}
    dom = conn.lookupByName(kvmname)
    dom.setMemoryStatsPeriod(10)
    # cpu usage
    t1 = time.time()
    c1 = int(dom.info()[4])
    time.sleep(0.1)
    t2 = time.time()
    c2 = int(dom.info()[4])
    c_nums = int(dom.info()[3])
    cpu_usage = round((c2 - c1) * 100 / ((t2 - t1) * c_nums * 1e9), 2)
    if cpu_usage>100:
        cpu_usage=100
    info['cpu_usage'] = cpu_usage
    print(info)
    return json.dumps(info['cpu_usage'])
# while(True):
#     print(cpu_usage())