Best Python code snippet using locust
dispatch.py
Source: dispatch.py
...270 to keep the distribution during ramp-up and ramp-down. If we were to use a normal271 weighted round-robin algorithm, we'd get AAAAABAAAAAB which would make the distribution272 less accurate during ramp-up/down.273 """274 def infinite_cycle_gen(users: List[Tuple[Type[User], int]]) -> itertools.cycle:275 if not users:276 return itertools.cycle([None])277 # Normalize the weights so that the smallest weight will be equal to "target_min_weight".278 # The value "2" was experimentally determined because it gave a better distribution especially279 # when dealing with weights which are close to each others, e.g. 1.5, 2, 2.4, etc.280 target_min_weight = 2281 # 'Value' here means weight or fixed count282 normalized_values = [283 (284 user.__name__,285 round(target_min_weight * value / min(u[1] for u in users)),286 )287 for user, value in users288 ]289 generation_length_to_get_proper_distribution = sum(290 normalized_val[1] for normalized_val in normalized_values291 )292 gen = smooth(normalized_values)293 # Instead of calling `gen()` for each user, we cycle through a generator of fixed-length294 # `generation_length_to_get_proper_distribution`. Doing so greatly improves performance because295 # we only ever need to call `gen()` a relatively small number of times. The length of this generator296 # is chosen as the sum of the normalized weights. So, for users A, B, C of weights 2, 5, 6, the length is297 # 2 + 5 + 6 = 13 which would yield the distribution `CBACBCBCBCABC` that gets repeated over and over298 # until the target user count is reached.299 return itertools.cycle(gen() for _ in range(generation_length_to_get_proper_distribution))300 fixed_users = {u.__name__: u for u in self._user_classes if u.fixed_count}301 cycle_fixed_gen = infinite_cycle_gen([(u, u.fixed_count) for u in fixed_users.values()])302 cycle_weighted_gen = infinite_cycle_gen([(u, u.weight) for u in self._user_classes if not u.fixed_count])303 # Spawn users304 while True:305 if self._try_dispatch_fixed:306 self._try_dispatch_fixed = False307 current_fixed_users_count = {u: self._get_user_current_count(u) for u in fixed_users}308 spawned_classes: Set[str] = set()309 while len(spawned_classes) != len(fixed_users):310 user_name: Optional[str] = next(cycle_fixed_gen)311 if not user_name:312 break313 if current_fixed_users_count[user_name] < fixed_users[user_name].fixed_count:314 current_fixed_users_count[user_name] += 1315 if current_fixed_users_count[user_name] == fixed_users[user_name].fixed_count:316 spawned_classes.add(user_name)...
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