| #!/usr/bin/env python |
| # Copyright 2015 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """Adjust pool balances to cover DUT shortfalls. |
| |
| This command takes all broken DUTs in a specific pool for specific |
| boards and swaps them with working DUTs taken from a selected pool |
| of spares. The command is meant primarily for replacing broken DUTs |
| in critical pools like BVT or CQ, but it can also be used to adjust |
| pool sizes, or to create or remove pools. |
| |
| usage: balance_pool.py [ options ] POOL BOARD [ BOARD ... ] |
| |
| positional arguments: |
| POOL Name of the pool to balance |
| BOARD Names of boards to balance |
| |
| optional arguments: |
| -h, --help show this help message and exit |
| -t COUNT, --total COUNT |
| Set the number of DUTs in the pool to the specified |
| count for every BOARD |
| -a COUNT, --grow COUNT |
| Add the specified number of DUTs to the pool for every |
| BOARD |
| -d COUNT, --shrink COUNT |
| Remove the specified number of DUTs from the pool for |
| every BOARD |
| -s POOL, --spare POOL |
| Pool from which to draw replacement spares (default: |
| pool:suites) |
| -n, --dry-run Report actions to take in the form of shell commands |
| |
| |
| The command attempts to remove all broken DUTs from the target POOL |
| for every BOARD, and replace them with enough working DUTs taken |
| from the spare pool to bring the strength of POOL to the requested |
| total COUNT. |
| |
| If no COUNT options are supplied (i.e. there are no --total, --grow, |
| or --shrink options), the command will maintain the current totals of |
| DUTs for every BOARD in the target POOL. |
| |
| If not enough working spares are available, broken DUTs may be left |
| in the pool to keep the pool at the target COUNT. |
| |
| When reducing pool size, working DUTs will be returned after broken |
| DUTs, if it's necessary to achieve the target COUNT. |
| |
| """ |
| |
| |
| import argparse |
| import sys |
| import time |
| |
| import common |
| from autotest_lib.server import frontend |
| from autotest_lib.site_utils import status_history |
| from autotest_lib.site_utils.suite_scheduler import constants |
| |
| |
| _POOL_PREFIX = constants.Labels.POOL_PREFIX |
| |
| |
| def _log_message(message, *args): |
| """Log a message with optional format arguments to stdout. |
| |
| This function logs a single line to stdout, with formatting |
| if necessary, and without adornments. |
| |
| If `*args` are supplied, the message will be formatted using |
| the arguments. |
| |
| @param message Message to be logged, possibly after formatting. |
| @param args Format arguments. If empty, the message is logged |
| without formatting. |
| |
| """ |
| if args: |
| message = message % args |
| sys.stdout.write('%s\n' % message) |
| |
| |
| def _log_info(dry_run, message, *args): |
| """Log information in a dry-run dependent fashion. |
| |
| This function logs a single line to stdout, with formatting |
| if necessary. When logging for a dry run, the message is |
| printed as a shell comment, rather than as unadorned text. |
| |
| If `*args` are supplied, the message will be formatted using |
| the arguments. |
| |
| @param message Message to be logged, possibly after formatting. |
| @param args Format arguments. If empty, the message is logged |
| without formatting. |
| |
| """ |
| if dry_run: |
| message = '# ' + message |
| _log_message(message, *args) |
| |
| |
| def _log_error(message, *args): |
| """Log an error to stderr, with optional format arguments. |
| |
| This function logs a single line to stderr, prefixed to indicate |
| that it is an error message. |
| |
| If `*args` are supplied, the message will be formatted using |
| the arguments. |
| |
| @param message Message to be logged, possibly after formatting. |
| @param args Format arguments. If empty, the message is logged |
| without formatting. |
| |
| """ |
| if args: |
| message = message % args |
| sys.stderr.write('ERROR: %s\n' % message) |
| |
| |
| class _DUTPool(object): |
| """Information about a pool of DUTs for a given board. |
| |
| This class collects information about all DUTs for a given |
| board and pool pair, and divides them into three categories: |
| + Working - the DUT is working for testing, and not locked. |
| + Broken - the DUT is unable to run tests, or it is locked. |
| + Ineligible - the DUT is not available to be removed from |
| this pool. The DUT may be either working or broken. |
| |
| DUTs with more than one pool: label are ineligible for exchange |
| during balancing. This is done for the sake of chameleon hosts, |
| which must always be assigned to pool:suites. These DUTs are |
| always marked with pool:chameleon to prevent their reassignment. |
| |
| TODO(jrbarnette): The use of `pool:chamelon` (instead of just |
| the `chameleon` label is a hack that should be eliminated. |
| |
| _DUTPool instances are used to track both main pools that need |
| to be resupplied with working DUTs and spare pools that supply |
| those DUTs. |
| |
| @property board Name of the board associated with |
| this pool of DUTs. |
| @property pool Name of the pool associated with |
| this pool of DUTs. |
| @property _working_hosts The list of this pool's working |
| DUTs. |
| @property _broken_hosts The list of this pool's broken |
| DUTs. |
| @property _ineligible__hosts The list of this pool's ineligible |
| DUTs. |
| @property _labels A list of labels that identify a DUT |
| as part of this pool. |
| @property _total_hosts The total number of hosts in pool. |
| |
| """ |
| |
| |
| def __init__(self, afe, board, pool, start_time, end_time): |
| self.board = board |
| self.pool = pool |
| self._working_hosts = [] |
| self._broken_hosts = [] |
| self._ineligible_hosts = [] |
| self._labels = [_POOL_PREFIX + self.pool] |
| self._total_hosts = self._get_hosts(afe, start_time, end_time) |
| |
| |
| def _get_hosts(self, afe, start_time, end_time): |
| all_histories = ( |
| status_history.HostJobHistory.get_multiple_histories( |
| afe, start_time, end_time, |
| board=self.board, pool=self.pool)) |
| for h in all_histories: |
| host = h.host |
| host_pools = [l for l in host.labels |
| if l.startswith(_POOL_PREFIX)] |
| if len(host_pools) != 1: |
| self._ineligible_hosts.append(host) |
| else: |
| diag = h.last_diagnosis()[0] |
| if (diag == status_history.WORKING and |
| not host.locked): |
| self._working_hosts.append(host) |
| else: |
| self._broken_hosts.append(host) |
| return len(all_histories) |
| |
| |
| @property |
| def pool_labels(self): |
| """Return the AFE labels that identify this pool. |
| |
| The returned labels are the labels that must be removed |
| to remove a DUT from the pool, or added to add a DUT. |
| |
| @return A list of AFE labels suitable for AFE.add_labels() |
| or AFE.remove_labels(). |
| |
| """ |
| return self._labels |
| |
| |
| def calculate_inventory(self, dry_run): |
| """Calculate and log how many DUTs are in this pool. |
| |
| Return the total number of DUTs in the pool across all three |
| categories (working, broken, and ineligible). As a side |
| effect, log the totals. |
| |
| @param dry_run Whether the logging is for a dry run or for |
| actual execution. |
| |
| @return The total number of DUTs in this pool. |
| |
| """ |
| _log_info(dry_run, 'Balancing %s %s pool:', |
| self.board, self.pool) |
| _log_info(dry_run, |
| 'Total %d DUTs, %d working, %d broken, %d reserved.', |
| self._total_hosts, len(self._working_hosts), |
| len(self._broken_hosts), len(self._ineligible_hosts)) |
| return self._total_hosts |
| |
| |
| def calculate_spares_needed(self, dry_run, target_total): |
| """Calculate and log the spares needed to achieve a target. |
| |
| Return how many working spares are needed to achieve the |
| given `target_total` with all DUTs working. Log the |
| adjustments entailed. |
| |
| The spares count may be positive or negative. Positive |
| values indicate spares are needed to replace broken DUTs in |
| order to reach the target; negative numbers indicate that |
| no spares are needed, and that a corresponding number of |
| working devices can be returned. |
| |
| If the new target total would require returning ineligible |
| DUTs, an error is logged, and the target total is adjusted |
| so that those DUTs are not exchanged. |
| |
| @param dry_run Whether the logging is for a dry run or |
| for actual execution. |
| @param target_total The new target pool size. |
| |
| @return The number of spares needed. |
| |
| """ |
| num_ineligible = len(self._ineligible_hosts) |
| if target_total < num_ineligible: |
| _log_error('%s %s pool: Target of %d is below ' |
| 'minimum of %d DUTs.', |
| self.board, self.pool, |
| target_total, num_ineligible) |
| _log_error('Adjusting target to %d DUTs.', num_ineligible) |
| target_total = num_ineligible |
| adjustment = target_total - self._total_hosts |
| if adjustment > 0: |
| add_msg = 'grow pool by %d DUTs' % adjustment |
| elif adjustment < 0: |
| add_msg = 'shrink pool by %d DUTs' % -adjustment |
| else: |
| add_msg = 'no change to pool size' |
| _log_info(dry_run, 'Target is %d working DUTs; %s.', |
| target_total, add_msg) |
| return len(self._broken_hosts) + adjustment |
| |
| |
| def allocate_working_spares(self, dry_run, num_requested): |
| """Allocate and log a list DUTs that can be used as spares. |
| |
| Return a list of up to `num_requested` hosts from this |
| pool's list of working hosts. Log details about this pool's |
| working spares. |
| |
| If the requested number of DUTs exceeds the supply, log an |
| error, and return as many working devices as possible. |
| |
| @param dry_run Whether the logging is for a dry run or |
| for actual execution. |
| @param num_requested Total number of DUTs to allocate from |
| this pool's working DUTs. |
| |
| @return A list of spare DUTs. |
| |
| """ |
| _log_info(dry_run, |
| '%s %s pool has %d spares available.', |
| self.board, self.pool, len(self._working_hosts)) |
| if num_requested > len(self._working_hosts): |
| _log_error('Not enough spares: need %d, only have %d.', |
| num_requested, len(self._working_hosts)) |
| return self._working_hosts[:num_requested] |
| |
| |
| def allocate_surplus(self, dry_run, num_broken): |
| """Allocate and log a list DUTs that can returned as surplus. |
| |
| Return a list of devices that can be returned in order to |
| reduce this pool's supply. Broken DUTs will be preferred |
| over working ones. Log information about the DUTs to be |
| returned. |
| |
| The `num_broken` parameter indicates the number of broken |
| DUTs to be left in the pool. If this number exceeds the |
| number of broken DUTs actually in the pool, the returned |
| list will be empty. If this number is negative, it |
| indicates a number of working DUTs to be returned in |
| addition to all broken ones. |
| |
| @param dry_run Whether the logging is for a dry run or |
| for actual execution. |
| @param num_broken Total number of broken DUTs to be left in |
| this pool. |
| |
| @return A list of DUTs to be returned as surplus. |
| |
| """ |
| if num_broken >= 0: |
| surplus = self._broken_hosts[num_broken:] |
| _log_info(dry_run, |
| '%s %s pool will return %d broken DUTs, ' |
| 'leaving %d still in the pool.', |
| self.board, self.pool, |
| len(surplus), |
| len(self._broken_hosts) - len(surplus)) |
| return surplus |
| else: |
| _log_info(dry_run, |
| '%s %s pool will return %d surplus DUTs, ' |
| 'including %d working DUTs.', |
| self.board, self.pool, |
| len(self._broken_hosts) - num_broken, |
| -num_broken) |
| return (self._broken_hosts + |
| self._working_hosts[:-num_broken]) |
| |
| |
| def _exchange_labels(dry_run, hosts, target_pool, spare_pool): |
| """Reassign a list of DUTs from one pool to another. |
| |
| For all the given hosts, remove all labels associated with |
| `spare_pool`, and add the labels for `target_pool`. Log the |
| action. |
| |
| If `dry_run` is true, perform no changes, but log the `atest` |
| commands needed to accomplish the necessary label changes. |
| |
| @param dry_run Whether the logging is for a dry run or |
| for actual execution. |
| @param hosts List of DUTs (AFE hosts) to be reassigned. |
| @param target_pool The `_DUTPool` object from which the hosts |
| are drawn. |
| @param spare_pool The `_DUTPool` object to which the hosts |
| will be added. |
| |
| """ |
| if not hosts: |
| return |
| _log_info(dry_run, 'Transferring %d DUTs from %s to %s.', |
| len(hosts), spare_pool.pool, target_pool.pool) |
| additions = target_pool.pool_labels |
| removals = spare_pool.pool_labels |
| for host in hosts: |
| if not dry_run: |
| _log_message('Updating host: %s.', host.hostname) |
| host.remove_labels(removals) |
| host.add_labels(additions) |
| else: |
| _log_message('atest label remove -m %s %s', |
| host.hostname, ' '.join(removals)) |
| _log_message('atest label add -m %s %s', |
| host.hostname, ' '.join(additions)) |
| |
| |
| def _balance_board(arguments, afe, board, start_time, end_time): |
| """Balance one board as requested by command line arguments. |
| |
| @param arguments Parsed command line arguments. |
| @param dry_run Whether the logging is for a dry run or |
| for actual execution. |
| @param afe AFE object to be used for the changes. |
| @param board Board to be balanced. |
| @param start_time Start time for HostJobHistory objects in |
| the DUT pools. |
| @param end_time End time for HostJobHistory objects in the |
| DUT pools. |
| |
| """ |
| spare_pool = _DUTPool(afe, board, arguments.spare, |
| start_time, end_time) |
| main_pool = _DUTPool(afe, board, arguments.pool, |
| start_time, end_time) |
| |
| target_total = main_pool.calculate_inventory(arguments.dry_run) |
| if arguments.total is not None: |
| target_total = arguments.total |
| elif arguments.grow: |
| target_total += arguments.grow |
| elif arguments.shrink: |
| target_total -= arguments.shrink |
| |
| spares_needed = main_pool.calculate_spares_needed( |
| arguments.dry_run, target_total) |
| if spares_needed > 0: |
| spare_duts = spare_pool.allocate_working_spares( |
| arguments.dry_run, spares_needed) |
| shortfall = spares_needed - len(spare_duts) |
| else: |
| spare_duts = [] |
| shortfall = spares_needed |
| |
| surplus_duts = main_pool.allocate_surplus( |
| arguments.dry_run, shortfall) |
| if not spare_duts and not surplus_duts: |
| _log_info(arguments.dry_run, 'No exchange required.') |
| return |
| |
| _exchange_labels(arguments.dry_run, surplus_duts, |
| spare_pool, main_pool) |
| _exchange_labels(arguments.dry_run, spare_duts, |
| main_pool, spare_pool) |
| |
| |
| def _parse_command(argv): |
| """Parse the command line arguments. |
| |
| Create an argument parser for this command's syntax, parse the |
| command line, and return the result of the `ArgumentParser` |
| `parse_args()` method. |
| |
| @param argv Standard command line argument vector; `argv[0]` is |
| assumed to be the command name. |
| |
| @return Result returned by `ArgumentParser.parse_args()`. |
| |
| """ |
| parser = argparse.ArgumentParser( |
| prog=argv[0], |
| description='Balance pool shortages from spares on reserve') |
| |
| count_group = parser.add_mutually_exclusive_group() |
| count_group.add_argument('-t', '--total', type=int, |
| metavar='COUNT', default=None, |
| help='Set the number of DUTs in the ' |
| 'pool to the specified count for ' |
| 'every BOARD') |
| count_group.add_argument('-a', '--grow', type=int, |
| metavar='COUNT', default=None, |
| help='Add the specified number of DUTs ' |
| 'to the pool for every BOARD') |
| count_group.add_argument('-d', '--shrink', type=int, |
| metavar='COUNT', default=None, |
| help='Remove the specified number of DUTs ' |
| 'from the pool for every BOARD') |
| |
| parser.add_argument('-s', '--spare', default='suites', |
| metavar='POOL', |
| help='Pool from which to draw replacement ' |
| 'spares (default: pool:suites)') |
| parser.add_argument('-n', '--dry-run', action='store_true', |
| help='Report actions to take in the form of ' |
| 'shell commands') |
| |
| parser.add_argument('pool', |
| metavar='POOL', |
| help='Name of the pool to balance') |
| parser.add_argument('boards', nargs='+', |
| metavar='BOARD', |
| help='Names of boards to balance') |
| |
| arguments = parser.parse_args(argv[1:]) |
| return arguments |
| |
| |
| def main(argv): |
| """Standard main routine. |
| |
| @param argv Command line arguments including `sys.argv[0]`. |
| |
| """ |
| arguments = _parse_command(argv) |
| end_time = time.time() |
| start_time = end_time - 24 * 60 * 60 |
| |
| first_time = True |
| try: |
| afe = frontend.AFE(server=None) |
| for board in arguments.boards: |
| if not first_time: |
| _log_message('') |
| _balance_board(arguments, afe, board, start_time, end_time) |
| first_time = False |
| except KeyboardInterrupt: |
| pass |
| |
| |
| if __name__ == '__main__': |
| main(sys.argv) |
