1#!/usr/bin/env python 2# 3# Tests for IO throttling 4# 5# Copyright (C) 2015 Red Hat, Inc. 6# Copyright (C) 2015-2016 Igalia, S.L. 7# 8# This program is free software; you can redistribute it and/or modify 9# it under the terms of the GNU General Public License as published by 10# the Free Software Foundation; either version 2 of the License, or 11# (at your option) any later version. 12# 13# This program is distributed in the hope that it will be useful, 14# but WITHOUT ANY WARRANTY; without even the implied warranty of 15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16# GNU General Public License for more details. 17# 18# You should have received a copy of the GNU General Public License 19# along with this program. If not, see <http://www.gnu.org/licenses/>. 20# 21 22import iotests 23 24nsec_per_sec = 1000000000 25 26class ThrottleTestCase(iotests.QMPTestCase): 27 test_img = "null-aio://" 28 max_drives = 3 29 30 def blockstats(self, device): 31 result = self.vm.qmp("query-blockstats") 32 for r in result['return']: 33 if r['device'] == device: 34 stat = r['stats'] 35 return stat['rd_bytes'], stat['rd_operations'], stat['wr_bytes'], stat['wr_operations'] 36 raise Exception("Device not found for blockstats: %s" % device) 37 38 def setUp(self): 39 self.vm = iotests.VM() 40 for i in range(0, self.max_drives): 41 self.vm.add_drive(self.test_img) 42 self.vm.launch() 43 44 def tearDown(self): 45 self.vm.shutdown() 46 47 def configure_throttle(self, ndrives, params): 48 params['group'] = 'test' 49 50 # Set the I/O throttling parameters to all drives 51 for i in range(0, ndrives): 52 params['device'] = 'drive%d' % i 53 result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params) 54 self.assert_qmp(result, 'return', {}) 55 56 def do_test_throttle(self, ndrives, seconds, params, first_drive = 0): 57 def check_limit(limit, num): 58 # IO throttling algorithm is discrete, allow 10% error so the test 59 # is more robust 60 return limit == 0 or \ 61 (num < seconds * limit * 1.1 / ndrives 62 and num > seconds * limit * 0.9 / ndrives) 63 64 # Set vm clock to a known value 65 ns = seconds * nsec_per_sec 66 self.vm.qtest("clock_step %d" % ns) 67 68 # Submit enough requests so the throttling mechanism kicks 69 # in. The throttled requests won't be executed until we 70 # advance the virtual clock. 71 rq_size = 512 72 rd_nr = max(params['bps'] / rq_size / 2, 73 params['bps_rd'] / rq_size, 74 params['iops'] / 2, 75 params['iops_rd']) 76 rd_nr *= seconds * 2 77 rd_nr /= ndrives 78 wr_nr = max(params['bps'] / rq_size / 2, 79 params['bps_wr'] / rq_size, 80 params['iops'] / 2, 81 params['iops_wr']) 82 wr_nr *= seconds * 2 83 wr_nr /= ndrives 84 85 # Send I/O requests to all drives 86 for i in range(rd_nr): 87 for drive in range(0, ndrives): 88 idx = first_drive + drive 89 self.vm.hmp_qemu_io("drive%d" % idx, "aio_read %d %d" % 90 (i * rq_size, rq_size)) 91 92 for i in range(wr_nr): 93 for drive in range(0, ndrives): 94 idx = first_drive + drive 95 self.vm.hmp_qemu_io("drive%d" % idx, "aio_write %d %d" % 96 (i * rq_size, rq_size)) 97 98 # We'll store the I/O stats for each drive in these arrays 99 start_rd_bytes = [0] * ndrives 100 start_rd_iops = [0] * ndrives 101 start_wr_bytes = [0] * ndrives 102 start_wr_iops = [0] * ndrives 103 end_rd_bytes = [0] * ndrives 104 end_rd_iops = [0] * ndrives 105 end_wr_bytes = [0] * ndrives 106 end_wr_iops = [0] * ndrives 107 108 # Read the stats before advancing the clock 109 for i in range(0, ndrives): 110 idx = first_drive + i 111 start_rd_bytes[i], start_rd_iops[i], start_wr_bytes[i], \ 112 start_wr_iops[i] = self.blockstats('drive%d' % idx) 113 114 self.vm.qtest("clock_step %d" % ns) 115 116 # Read the stats after advancing the clock 117 for i in range(0, ndrives): 118 idx = first_drive + i 119 end_rd_bytes[i], end_rd_iops[i], end_wr_bytes[i], \ 120 end_wr_iops[i] = self.blockstats('drive%d' % idx) 121 122 # Check that the I/O is within the limits and evenly distributed 123 for i in range(0, ndrives): 124 rd_bytes = end_rd_bytes[i] - start_rd_bytes[i] 125 rd_iops = end_rd_iops[i] - start_rd_iops[i] 126 wr_bytes = end_wr_bytes[i] - start_wr_bytes[i] 127 wr_iops = end_wr_iops[i] - start_wr_iops[i] 128 129 self.assertTrue(check_limit(params['bps'], rd_bytes + wr_bytes)) 130 self.assertTrue(check_limit(params['bps_rd'], rd_bytes)) 131 self.assertTrue(check_limit(params['bps_wr'], wr_bytes)) 132 self.assertTrue(check_limit(params['iops'], rd_iops + wr_iops)) 133 self.assertTrue(check_limit(params['iops_rd'], rd_iops)) 134 self.assertTrue(check_limit(params['iops_wr'], wr_iops)) 135 136 # Allow remaining requests to finish. We submitted twice as many to 137 # ensure the throttle limit is reached. 138 self.vm.qtest("clock_step %d" % ns) 139 140 # Connect N drives to a VM and test I/O in all of them 141 def test_all(self): 142 params = {"bps": 4096, 143 "bps_rd": 4096, 144 "bps_wr": 4096, 145 "iops": 10, 146 "iops_rd": 10, 147 "iops_wr": 10, 148 } 149 # Repeat the test with different numbers of drives 150 for ndrives in range(1, self.max_drives + 1): 151 # Pick each out of all possible params and test 152 for tk in params: 153 limits = dict([(k, 0) for k in params]) 154 limits[tk] = params[tk] * ndrives 155 self.configure_throttle(ndrives, limits) 156 self.do_test_throttle(ndrives, 5, limits) 157 158 # Connect N drives to a VM and test I/O in just one of them a time 159 def test_one(self): 160 params = {"bps": 4096, 161 "bps_rd": 4096, 162 "bps_wr": 4096, 163 "iops": 10, 164 "iops_rd": 10, 165 "iops_wr": 10, 166 } 167 # Repeat the test for each one of the drives 168 for drive in range(0, self.max_drives): 169 # Pick each out of all possible params and test 170 for tk in params: 171 limits = dict([(k, 0) for k in params]) 172 limits[tk] = params[tk] * self.max_drives 173 self.configure_throttle(self.max_drives, limits) 174 self.do_test_throttle(1, 5, limits, drive) 175 176 def test_burst(self): 177 params = {"bps": 4096, 178 "bps_rd": 4096, 179 "bps_wr": 4096, 180 "iops": 10, 181 "iops_rd": 10, 182 "iops_wr": 10, 183 } 184 ndrives = 1 185 # Pick each out of all possible params and test 186 for tk in params: 187 rate = params[tk] * ndrives 188 burst_rate = rate * 7 189 burst_length = 4 190 191 # Configure the throttling settings 192 settings = dict([(k, 0) for k in params]) 193 settings[tk] = rate 194 settings['%s_max' % tk] = burst_rate 195 settings['%s_max_length' % tk] = burst_length 196 self.configure_throttle(ndrives, settings) 197 198 # Wait for the bucket to empty so we can do bursts 199 wait_ns = nsec_per_sec * burst_length * burst_rate / rate 200 self.vm.qtest("clock_step %d" % wait_ns) 201 202 # Test I/O at the max burst rate 203 limits = dict([(k, 0) for k in params]) 204 limits[tk] = burst_rate 205 self.do_test_throttle(ndrives, burst_length, limits) 206 207 # Now test I/O at the normal rate 208 limits[tk] = rate 209 self.do_test_throttle(ndrives, 5, limits) 210 211class ThrottleTestCoroutine(ThrottleTestCase): 212 test_img = "null-co://" 213 214class ThrottleTestGroupNames(iotests.QMPTestCase): 215 test_img = "null-aio://" 216 max_drives = 3 217 218 def setUp(self): 219 self.vm = iotests.VM() 220 for i in range(0, self.max_drives): 221 self.vm.add_drive(self.test_img, "throttling.iops-total=100") 222 self.vm.launch() 223 224 def tearDown(self): 225 self.vm.shutdown() 226 227 def set_io_throttle(self, device, params): 228 params["device"] = device 229 result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params) 230 self.assert_qmp(result, 'return', {}) 231 232 def verify_name(self, device, name): 233 result = self.vm.qmp("query-block") 234 for r in result["return"]: 235 if r["device"] == device: 236 info = r["inserted"] 237 if name: 238 self.assertEqual(info["group"], name) 239 else: 240 self.assertFalse(info.has_key('group')) 241 return 242 243 raise Exception("No group information found for '%s'" % device) 244 245 def test_group_naming(self): 246 params = {"bps": 0, 247 "bps_rd": 0, 248 "bps_wr": 0, 249 "iops": 0, 250 "iops_rd": 0, 251 "iops_wr": 0} 252 253 # Check the drives added using the command line. 254 # The default throttling group name is the device name. 255 for i in range(self.max_drives): 256 devname = "drive%d" % i 257 self.verify_name(devname, devname) 258 259 # Clear throttling settings => the group name is gone. 260 for i in range(self.max_drives): 261 devname = "drive%d" % i 262 self.set_io_throttle(devname, params) 263 self.verify_name(devname, None) 264 265 # Set throttling settings using block_set_io_throttle and 266 # check the default group names. 267 params["iops"] = 10 268 for i in range(self.max_drives): 269 devname = "drive%d" % i 270 self.set_io_throttle(devname, params) 271 self.verify_name(devname, devname) 272 273 # Set a custom group name for each device 274 for i in range(3): 275 devname = "drive%d" % i 276 groupname = "group%d" % i 277 params['group'] = groupname 278 self.set_io_throttle(devname, params) 279 self.verify_name(devname, groupname) 280 281 # Put drive0 in group1 and check that all other devices remain 282 # unchanged 283 params['group'] = 'group1' 284 self.set_io_throttle('drive0', params) 285 self.verify_name('drive0', 'group1') 286 for i in range(1, self.max_drives): 287 devname = "drive%d" % i 288 groupname = "group%d" % i 289 self.verify_name(devname, groupname) 290 291 # Put drive0 in group2 and check that all other devices remain 292 # unchanged 293 params['group'] = 'group2' 294 self.set_io_throttle('drive0', params) 295 self.verify_name('drive0', 'group2') 296 for i in range(1, self.max_drives): 297 devname = "drive%d" % i 298 groupname = "group%d" % i 299 self.verify_name(devname, groupname) 300 301 # Clear throttling settings from drive0 check that all other 302 # devices remain unchanged 303 params["iops"] = 0 304 self.set_io_throttle('drive0', params) 305 self.verify_name('drive0', None) 306 for i in range(1, self.max_drives): 307 devname = "drive%d" % i 308 groupname = "group%d" % i 309 self.verify_name(devname, groupname) 310 311 312if __name__ == '__main__': 313 iotests.main(supported_fmts=["raw"]) 314