a26ddb4396
iotest 093 contains a test that creates a throttling group with
several drives and performs I/O in all of them. This patch adds a new
test that creates a similar setup but only performs I/O in one of the
drives at the same time.
This is useful to test that the round robin algorithm is behaving
properly in these scenarios, and is specifically written using the
regression introduced in 27ccdd5259 as an example.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
310 lines
11 KiB
Python
Executable file
310 lines
11 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Tests for IO throttling
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#
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# Copyright (C) 2015 Red Hat, Inc.
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# Copyright (C) 2015-2016 Igalia, S.L.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import iotests
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nsec_per_sec = 1000000000
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class ThrottleTestCase(iotests.QMPTestCase):
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test_img = "null-aio://"
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max_drives = 3
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def blockstats(self, device):
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result = self.vm.qmp("query-blockstats")
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for r in result['return']:
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if r['device'] == device:
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stat = r['stats']
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return stat['rd_bytes'], stat['rd_operations'], stat['wr_bytes'], stat['wr_operations']
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raise Exception("Device not found for blockstats: %s" % device)
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def setUp(self):
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self.vm = iotests.VM()
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for i in range(0, self.max_drives):
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self.vm.add_drive(self.test_img)
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self.vm.launch()
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def tearDown(self):
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self.vm.shutdown()
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def configure_throttle(self, ndrives, params):
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params['group'] = 'test'
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# Set the I/O throttling parameters to all drives
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for i in range(0, ndrives):
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params['device'] = 'drive%d' % i
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result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params)
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self.assert_qmp(result, 'return', {})
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def do_test_throttle(self, ndrives, seconds, params, first_drive = 0):
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def check_limit(limit, num):
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# IO throttling algorithm is discrete, allow 10% error so the test
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# is more robust
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return limit == 0 or \
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(num < seconds * limit * 1.1 / ndrives
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and num > seconds * limit * 0.9 / ndrives)
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# Set vm clock to a known value
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ns = seconds * nsec_per_sec
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self.vm.qtest("clock_step %d" % ns)
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# Submit enough requests so the throttling mechanism kicks
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# in. The throttled requests won't be executed until we
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# advance the virtual clock.
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rq_size = 512
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rd_nr = max(params['bps'] / rq_size / 2,
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params['bps_rd'] / rq_size,
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params['iops'] / 2,
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params['iops_rd'])
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rd_nr *= seconds * 2
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rd_nr /= ndrives
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wr_nr = max(params['bps'] / rq_size / 2,
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params['bps_wr'] / rq_size,
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params['iops'] / 2,
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params['iops_wr'])
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wr_nr *= seconds * 2
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wr_nr /= ndrives
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# Send I/O requests to all drives
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for i in range(rd_nr):
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for drive in range(0, ndrives):
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idx = first_drive + drive
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self.vm.hmp_qemu_io("drive%d" % idx, "aio_read %d %d" %
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(i * rq_size, rq_size))
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for i in range(wr_nr):
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for drive in range(0, ndrives):
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idx = first_drive + drive
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self.vm.hmp_qemu_io("drive%d" % idx, "aio_write %d %d" %
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(i * rq_size, rq_size))
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# We'll store the I/O stats for each drive in these arrays
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start_rd_bytes = [0] * ndrives
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start_rd_iops = [0] * ndrives
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start_wr_bytes = [0] * ndrives
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start_wr_iops = [0] * ndrives
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end_rd_bytes = [0] * ndrives
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end_rd_iops = [0] * ndrives
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end_wr_bytes = [0] * ndrives
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end_wr_iops = [0] * ndrives
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# Read the stats before advancing the clock
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for i in range(0, ndrives):
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idx = first_drive + i
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start_rd_bytes[i], start_rd_iops[i], start_wr_bytes[i], \
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start_wr_iops[i] = self.blockstats('drive%d' % idx)
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self.vm.qtest("clock_step %d" % ns)
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# Read the stats after advancing the clock
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for i in range(0, ndrives):
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idx = first_drive + i
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end_rd_bytes[i], end_rd_iops[i], end_wr_bytes[i], \
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end_wr_iops[i] = self.blockstats('drive%d' % idx)
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# Check that the I/O is within the limits and evenly distributed
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for i in range(0, ndrives):
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rd_bytes = end_rd_bytes[i] - start_rd_bytes[i]
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rd_iops = end_rd_iops[i] - start_rd_iops[i]
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wr_bytes = end_wr_bytes[i] - start_wr_bytes[i]
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wr_iops = end_wr_iops[i] - start_wr_iops[i]
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self.assertTrue(check_limit(params['bps'], rd_bytes + wr_bytes))
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self.assertTrue(check_limit(params['bps_rd'], rd_bytes))
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self.assertTrue(check_limit(params['bps_wr'], wr_bytes))
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self.assertTrue(check_limit(params['iops'], rd_iops + wr_iops))
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self.assertTrue(check_limit(params['iops_rd'], rd_iops))
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self.assertTrue(check_limit(params['iops_wr'], wr_iops))
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# Connect N drives to a VM and test I/O in all of them
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def test_all(self):
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params = {"bps": 4096,
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"bps_rd": 4096,
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"bps_wr": 4096,
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"iops": 10,
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"iops_rd": 10,
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"iops_wr": 10,
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}
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# Repeat the test with different numbers of drives
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for ndrives in range(1, self.max_drives + 1):
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# Pick each out of all possible params and test
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for tk in params:
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limits = dict([(k, 0) for k in params])
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limits[tk] = params[tk] * ndrives
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self.configure_throttle(ndrives, limits)
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self.do_test_throttle(ndrives, 5, limits)
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# Connect N drives to a VM and test I/O in just one of them a time
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def test_one(self):
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params = {"bps": 4096,
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"bps_rd": 4096,
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"bps_wr": 4096,
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"iops": 10,
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"iops_rd": 10,
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"iops_wr": 10,
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}
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# Repeat the test for each one of the drives
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for drive in range(0, self.max_drives):
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# Pick each out of all possible params and test
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for tk in params:
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limits = dict([(k, 0) for k in params])
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limits[tk] = params[tk] * self.max_drives
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self.configure_throttle(self.max_drives, limits)
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self.do_test_throttle(1, 5, limits, drive)
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def test_burst(self):
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params = {"bps": 4096,
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"bps_rd": 4096,
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"bps_wr": 4096,
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"iops": 10,
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"iops_rd": 10,
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"iops_wr": 10,
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}
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ndrives = 1
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# Pick each out of all possible params and test
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for tk in params:
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rate = params[tk] * ndrives
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burst_rate = rate * 7
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burst_length = 4
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# Configure the throttling settings
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settings = dict([(k, 0) for k in params])
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settings[tk] = rate
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settings['%s_max' % tk] = burst_rate
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settings['%s_max_length' % tk] = burst_length
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self.configure_throttle(ndrives, settings)
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# Wait for the bucket to empty so we can do bursts
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wait_ns = nsec_per_sec * burst_length * burst_rate / rate
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self.vm.qtest("clock_step %d" % wait_ns)
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# Test I/O at the max burst rate
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limits = dict([(k, 0) for k in params])
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limits[tk] = burst_rate
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self.do_test_throttle(ndrives, burst_length, limits)
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# Now test I/O at the normal rate
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limits[tk] = rate
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self.do_test_throttle(ndrives, 5, limits)
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class ThrottleTestCoroutine(ThrottleTestCase):
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test_img = "null-co://"
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class ThrottleTestGroupNames(iotests.QMPTestCase):
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test_img = "null-aio://"
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max_drives = 3
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def setUp(self):
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self.vm = iotests.VM()
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for i in range(0, self.max_drives):
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self.vm.add_drive(self.test_img, "throttling.iops-total=100")
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self.vm.launch()
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def tearDown(self):
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self.vm.shutdown()
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def set_io_throttle(self, device, params):
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params["device"] = device
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result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params)
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self.assert_qmp(result, 'return', {})
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def verify_name(self, device, name):
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result = self.vm.qmp("query-block")
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for r in result["return"]:
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if r["device"] == device:
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info = r["inserted"]
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if name:
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self.assertEqual(info["group"], name)
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else:
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self.assertFalse(info.has_key('group'))
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return
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raise Exception("No group information found for '%s'" % device)
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def test_group_naming(self):
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params = {"bps": 0,
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"bps_rd": 0,
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"bps_wr": 0,
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"iops": 0,
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"iops_rd": 0,
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"iops_wr": 0}
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# Check the drives added using the command line.
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# The default throttling group name is the device name.
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for i in range(self.max_drives):
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devname = "drive%d" % i
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self.verify_name(devname, devname)
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# Clear throttling settings => the group name is gone.
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for i in range(self.max_drives):
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devname = "drive%d" % i
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self.set_io_throttle(devname, params)
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self.verify_name(devname, None)
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# Set throttling settings using block_set_io_throttle and
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# check the default group names.
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params["iops"] = 10
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for i in range(self.max_drives):
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devname = "drive%d" % i
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self.set_io_throttle(devname, params)
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self.verify_name(devname, devname)
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# Set a custom group name for each device
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for i in range(3):
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devname = "drive%d" % i
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groupname = "group%d" % i
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params['group'] = groupname
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self.set_io_throttle(devname, params)
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self.verify_name(devname, groupname)
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# Put drive0 in group1 and check that all other devices remain
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# unchanged
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params['group'] = 'group1'
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self.set_io_throttle('drive0', params)
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self.verify_name('drive0', 'group1')
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for i in range(1, self.max_drives):
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devname = "drive%d" % i
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groupname = "group%d" % i
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self.verify_name(devname, groupname)
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# Put drive0 in group2 and check that all other devices remain
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# unchanged
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params['group'] = 'group2'
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self.set_io_throttle('drive0', params)
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self.verify_name('drive0', 'group2')
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for i in range(1, self.max_drives):
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devname = "drive%d" % i
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groupname = "group%d" % i
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self.verify_name(devname, groupname)
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# Clear throttling settings from drive0 check that all other
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# devices remain unchanged
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params["iops"] = 0
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self.set_io_throttle('drive0', params)
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self.verify_name('drive0', None)
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for i in range(1, self.max_drives):
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devname = "drive%d" % i
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groupname = "group%d" % i
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self.verify_name(devname, groupname)
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if __name__ == '__main__':
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iotests.main(supported_fmts=["raw"])
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