How to get system iops in Python

iops introduction

iops is mainly used in data. This indicator is an important reference for database performance evaluation. Iops refers to reading and writing (I/O) per second. ) The number of operations mainly depends on the performance of random access. Generally, in order to increase IOPS, disk arrays must be relied on. The actual online databases are basically configured with raid10. Raid5 cannot withstand the pressure in the actual production environment. Of course, You also need to check the specific business pressure. If you are using a physical machine, you need to see how much IOPS can reach in practice. Clouds are now common. If you use an RDS cloud database, you can choose the IOPS according to your business situation. , basically a parameter, which can be modified as needed. Of course, the larger the value, the higher the cost.

Python obtains the system iops code as follows:

#!/usr/bin/python

import os, time, math

run_tests = 3

devices = os.listdir('/sys/block/')
check_devices = []

reads = {}
writes = {}

for dev in devices:
    if dev.startswith('md') or dev.startswith('sd') or dev.startswith('hd'):
        check_devices.append(dev)
        reads[dev] = []
        writes[dev] = []

check_devices = sorted(check_devices)

for t in range(run_tests + 1):
    for dev in check_devices:
        file_data = open('/sys/block/%s/stat' % dev).readline().strip().split(' ')
        clean = []
        for num in file_data:
            if num != '':
                clean.append(int(num))

        reads[dev].append(clean[0])
        writes[dev].append(clean[4])
    print reads[dev]
    print writes[dev]

    time.sleep(1)



print "Device    Read    Write"
print "--------------------------------------"
for dev in check_devices:
    clean_reads = []
    reads[dev].reverse()
    for test, result in enumerate(reads[dev]):
        if test > 0:
            clean_reads.append(float(reads[dev][test - 1] - result))

    rops = int(math.ceil(sum(clean_reads) / len(clean_reads)))

    clean_writes = []
    writes[dev].reverse()
    for test, result in enumerate(writes[dev]):
        if test > 0:
            clean_writes.append(float(writes[dev][test - 1] - result))

    wops = int(math.ceil(sum(clean_writes) / len(clean_writes)))

    print "%s %s %s" % (dev.ljust(13), repr(rops).ljust(11), repr(wops))

Summary

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