Add week 4 materials
This commit is contained in:
@@ -0,0 +1,42 @@
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import random
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from anysystem import Context, Message, Process
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class Peer(Process):
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def __init__(self, proc_id: int, proc_count: int, fanout: int):
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self._id = proc_id
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self._proc_count = proc_count
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self._peers = [id for id in range(0, self._proc_count) if id != self._id]
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self._fanout = fanout
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self._info = None
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def on_local_message(self, msg: Message, ctx: Context):
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if msg.type == 'START':
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ctx.set_timer("gossip", 1)
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elif msg.type == 'BROADCAST':
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self.got_info(msg['info'], ctx)
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def on_start(self, ctx: Context):
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pass
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def on_message(self, msg: Message, sender: str, ctx: Context):
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if msg.type == 'GOSSIP_REQ' and self._info is not None:
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ctx.send(Message('GOSSIP_RESP', {'info': self._info}), sender)
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elif msg.type == 'GOSSIP_RESP' and self._info is None:
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self.got_info(msg['info'], ctx)
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def on_timer(self, timer_name: str, ctx: Context):
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if self._info is None:
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self.gossip(ctx)
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ctx.set_timer("gossip", 1)
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def got_info(self, info, ctx):
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self._info = info
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ctx.send_local(Message('DELIVER', {'info': self._info}))
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ctx.cancel_timer("gossip")
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ctx.send_local(Message('STOPPED', {}))
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def gossip(self, ctx):
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for peer in random.sample(self._peers, self._fanout):
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ctx.send(Message('GOSSIP_REQ', {}), str(peer))
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@@ -0,0 +1,38 @@
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import random
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from anysystem import Context, Message, Process
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class Peer(Process):
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def __init__(self, proc_id: int, proc_count: int, fanout: int):
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self._id = proc_id
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self._proc_count = proc_count
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self._peers = [id for id in range(0, self._proc_count) if id != self._id]
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self._fanout = fanout
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self._info = None
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def on_local_message(self, msg: Message, ctx: Context):
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if msg.type == 'START':
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ctx.set_timer("gossip", 1)
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elif msg.type == 'BROADCAST':
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self.got_info(msg['info'], ctx)
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def on_start(self, ctx: Context):
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pass
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def on_message(self, msg: Message, sender: str, ctx: Context):
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if msg.type == 'GOSSIP' and self._info is None:
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self.got_info(msg['info'], ctx)
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def on_timer(self, timer_name: str, ctx: Context):
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if self._info is not None:
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self.gossip(ctx)
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ctx.set_timer("gossip", 1)
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def got_info(self, info, ctx):
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self._info = info
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ctx.send_local(Message('DELIVER', {'info': self._info}))
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def gossip(self, ctx):
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for peer in random.sample(self._peers, self._fanout):
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ctx.send(Message('GOSSIP', {'info': self._info}), str(peer))
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@@ -0,0 +1,43 @@
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import random
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from anysystem import Context, Message, Process
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class Peer(Process):
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def __init__(self, proc_id: int, proc_count: int, fanout: int):
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self._id = proc_id
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self._proc_count = proc_count
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self._peers = [id for id in range(0, self._proc_count) if id != self._id]
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self._fanout = fanout
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self._info = None
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def on_local_message(self, msg: Message, ctx: Context):
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if msg.type == 'START':
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ctx.set_timer("gossip", 1)
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elif msg.type == 'BROADCAST':
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self.got_info(msg['info'], ctx)
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def on_start(self, ctx: Context):
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pass
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def on_message(self, msg: Message, sender: str, ctx: Context):
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if msg.type == 'GOSSIP_REQ':
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if self._info is not None:
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ctx.send(Message('GOSSIP_RESP', {'info': self._info}), sender)
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else:
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if msg['info'] is not None:
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self.got_info(msg['info'], ctx)
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elif msg.type == 'GOSSIP_RESP' and self._info is None:
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self.got_info(msg['info'], ctx)
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def on_timer(self, timer_name: str, ctx: Context):
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self.gossip(ctx)
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ctx.set_timer("gossip", 1)
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def got_info(self, info, ctx):
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self._info = info
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ctx.send_local(Message('DELIVER', {'info': self._info}))
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def gossip(self, ctx):
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for peer in random.sample(self._peers, self._fanout):
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ctx.send(Message('GOSSIP_REQ', {'info': self._info}), str(peer))
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@@ -0,0 +1,54 @@
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import random
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from anysystem import Context, Message, Process
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class Peer(Process):
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def __init__(self, proc_id: int, proc_count: int, fanout: int):
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self._id = proc_id
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self._proc_count = proc_count
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self._peers = [id for id in range(0, self._proc_count) if id != self._id]
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self._fanout = fanout
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self._info = None
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self._stop_prob = 0.8
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self._stopped = False
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def on_local_message(self, msg: Message, ctx: Context):
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if msg.type == 'START':
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ctx.set_timer("gossip", 1)
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elif msg.type == 'BROADCAST':
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self.got_info(msg['info'], ctx)
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def on_start(self, ctx: Context):
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pass
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def on_message(self, msg: Message, sender: str, ctx: Context):
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if msg.type == 'GOSSIP_REQ':
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if self._info is not None:
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ctx.send(Message('GOSSIP_RESP', {'info': self._info}), sender)
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elif msg['info'] is not None:
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self.got_info(msg['info'], ctx)
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elif msg.type == 'GOSSIP_RESP':
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self.got_info(msg['info'], ctx)
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def on_timer(self, timer_name: str, ctx: Context):
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self.gossip(ctx)
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ctx.set_timer("gossip", 1)
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def got_info(self, info, ctx):
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if self._info is None:
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self._info = info
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ctx.send_local(Message('DELIVER', {'info': self._info}))
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else:
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self.try_stop(ctx)
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def gossip(self, ctx):
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for peer in random.sample(self._peers, self._fanout):
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ctx.send(Message('GOSSIP_REQ', {'info': self._info}), str(peer))
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def try_stop(self, ctx):
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if not self._stopped and random.uniform(0, 1) < self._stop_prob:
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self._stopped = True
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# Stop initiating exchanges; keep answering incoming requests.
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ctx.cancel_timer("gossip")
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ctx.send_local(Message('STOPPED', {}))
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@@ -0,0 +1,129 @@
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# Знакомство с gossip
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В этой работе сравним push, pull и push-pull в симуляторе на [AnySystem](https://github.com/systems-group/anysystem). Перед каждым экспериментом запишите прогноз, затем сравните его с результатом и объясните различия.
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## Подготовка
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Откройте корень репозитория курса в IDE. Для VS Code с Pylance [стаб AnySystem](../../../../typings/anysystem/__init__.pyi) подключается через [настройки проекта](../../../../pyrightconfig.json). Для другой IDE укажите папку `typings` в корне репозитория как каталог стабов. Стаб содержит объявления и документацию API; реализация доступна в [исходнике AnySystem 0.3.0](https://github.com/osukhoroslov/anysystem/blob/v0.3.0/python/anysystem.py).
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При запуске симулятора локально или в Docker Python-модуль встроен в AnySystem. Отдельный `anysystem.py` и настройка `PYTHONPATH` не нужны.
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Из корня репозитория перейдите в каталог лабораторной:
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```sh
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cd materials/04-group-comm/seminar/gossip
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```
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Если установлен Rust, соберите текущую версию симулятора:
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```sh
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cargo install --locked --path simulator
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distsys-gossip -h
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```
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Для запуска в Docker соберите образ из текущего кода:
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```sh
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docker build -t distsys-gossip-seminar simulator
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docker run --rm -t -v ./:/impl distsys-gossip-seminar -h
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```
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Далее заменяйте `distsys-gossip` на `docker run --rm -t -v ./:/impl distsys-gossip-seminar`. Команды выполняются из каталога `gossip`. Если оболочка не передаёт относительный путь монтирования, в PowerShell используйте `--mount "type=bind,source=$($PWD.Path),target=/impl"` вместо `-v ./:/impl`.
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## Модель и метрики
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Распространяется одно сообщение, изначально известное процессу `0`. Все узлы знают состав группы и выбирают случайных соседей, исключая себя. Сетевая задержка равна 0,1 единицы модельного времени, периодический таймер срабатывает через 1. В этих экспериментах узлы не отказывают; можно задавать вероятность потери сетевого сообщения.
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Основные параметры:
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| Параметр | Значение |
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| --- | --- |
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| `-i` | Файл реализации |
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| `-n` | Число узлов, не меньше 2 |
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| `-f` | Число соседей для одного обмена, от 1 до `n - 1` |
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| `-d` | Вероятность потери сообщения, от 0 до 1 |
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| `-s` | Seed для воспроизведения запуска |
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| `-t` | Положительный лимит модельного времени |
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| `-q` | Завершить симуляцию при обнаружении полного охвата |
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В таблице вывода `time` — модельное время, `delivered` — число узлов, доставивших сообщение приложению, `stopped` — число узлов, прекративших периодические инициативные обмены, `messages` — накопленное число сетевых отправлений, включая запросы и ответы. `STOPPED` не означает выключение узла: он сохраняет информацию и может отвечать на входящие запросы.
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Симулятор выводит статистику после продвижения времени интервалами по 1. В итоговой строке `First full-coverage sample` указаны время первой напечатанной строки с `delivered = n` и число отправлений к ней. Обозначим их `t_all` и `M_all`. Это показатели с дискретностью вывода, а не точные мгновение последней доставки и число отправлений в это мгновение.
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Строка `Finished` объясняет завершение:
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- `full coverage (--quick-mode)` — сработало условие `-q`;
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- `no pending events` — в симуляции не осталось событий;
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- `time limit reached` — достигнут лимит времени.
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Если условия совпали, отсутствие событий проверяется первым, затем полный охват с `-q`, затем лимит. Строка `Final state` всегда показывает фактический охват и трафик к завершению. Если полного охвата не было, выводится `Full coverage: not reached`. Завершение по лимиту не означает, что алгоритм сам остановился.
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## 1. Сравнение push, pull и push-pull
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Изучите [push.py](push.py), [pull.py](pull.py) и [push_pull.py](push_pull.py). В push информированный узел посылает данные соседям. В pull неинформированный узел запрашивает их; после получения перестаёт инициировать запросы, но продолжает отвечать другим. В push-pull запрос сам может нести информацию, а информированный получатель отвечает своими данными.
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До запуска ответьте:
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1. Какой подход быстрее распространит информацию в начале, когда источник один?
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2. Какой подход быстрее найдёт последних неинформированных участников?
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3. Должен ли самый быстрый вариант отправить меньше всего сообщений?
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Запустите алгоритмы с одинаковыми параметрами:
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```sh
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distsys-gossip -i push.py -n 1000 -f 2 -s 123 -d 0 -t 60 -q
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distsys-gossip -i pull.py -n 1000 -f 2 -s 123 -d 0 -t 60 -q
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distsys-gossip -i push_pull.py -n 1000 -f 2 -s 123 -d 0 -t 60 -q
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```
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Заполните таблицу. Если полного охвата нет, укажите достигнутый охват и число отправлений к лимиту вместо `t_all` и `M_all`.
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| Алгоритм | `n` | `f` | `d` | seed | `t_all` | `M_all` | Причина завершения |
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| --- | --- | --- | --- | --- | --- | --- | --- |
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| push | 1000 | 2 | 0 | 123 | | | |
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| pull | 1000 | 2 | 0 | 123 | | | |
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| push-pull | 1000 | 2 | 0 | 123 | | | |
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Сравните начальный рост и доставку последним узлам. Объясните результат через действия отправителей. Флаг `-q` использует глобальную статистику симулятора: сами процессы не узнают, что сообщение уже получили все. В push и push-pull периодические обмены без этого ограничения продолжаются.
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## 2. Изменение одного параметра
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Выберите один алгоритм и сравните каждый следующий запуск с его базовым результатом. В командах замените `push.py` на выбранный файл.
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Сначала увеличьте fanout с 2 до 4:
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```sh
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distsys-gossip -i push.py -n 1000 -f 4 -s 123 -d 0 -t 60 -q
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```
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Затем верните fanout 2 и добавьте вероятность потери 0,2:
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```sh
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distsys-gossip -i push.py -n 1000 -f 2 -s 123 -d 0.2 -t 60 -q
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||||
```
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||||
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Для каждого запуска сначала запишите прогноз, затем добавьте строку результатов в таблицу. Как изменились время и цена охвата? Почему больше контактов за раунд не обязательно означает пропорционально меньшую задержку? Что можно заключить, если охват не достигнут за 60 единиц времени?
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||||
|
||||
Один запуск показывает конкретное выполнение. При наличии времени повторите сравнение на seed `124` и `125`. Одинаковый seed воспроизводит запуск данной реализации; разные алгоритмы расходуют случайные числа по-разному, поэтому их контакты и потери не обязаны совпадать. Если меняете лимит времени, используйте один лимит для сопоставляемых запусков.
|
||||
|
||||
## 3. Полный охват и прекращение обменов
|
||||
|
||||
Изучите [push_pull_stop.py](push_pull_stop.py) и запустите его без `-q`:
|
||||
|
||||
```sh
|
||||
distsys-gossip -i push_pull_stop.py -n 1000 -f 2 -s 123 -d 0 -t 60
|
||||
```
|
||||
|
||||
При повторном получении информации через `got_info` узел с вероятностью 0,8 отменяет свой таймер и выдаёт `STOPPED`. Он продолжает отвечать на запросы. Неинформированные узлы продолжают искать данные; остановка таймера у держателя не удаляет доступную копию.
|
||||
|
||||
Выпишите показатели первой строки с полным охватом и показатели завершения. Совпадают ли они? Какой трафик возникает между ними? Подтвердите по `Finished`, что запуск завершился из-за отсутствия событий, а не по лимиту.
|
||||
|
||||
Для сравнения стоимости распространения используйте `M_all` всех четырёх вариантов. Число отправлений к концу запуска с остановкой — другая метрика. Итоговые `max/min/mean` отправлений по узлам также относятся к концу запуска, который может наступить позже полного охвата.
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||||
|
||||
## Обсуждение
|
||||
|
||||
- Какие оптимизации могут уменьшить число повторных передач?
|
||||
- Почему успешный запуск при потерях не доказывает Uniform Agreement при отказах процессов?
|
||||
- Какая дополнительная информация и логика понадобятся для нескольких сообщений и причинного порядка доставки?
|
||||
|
||||
Сформулируйте вывод о скорости распространения, сетевых затратах и прекращении активности отдельно. Свяжите каждый вывод с наблюдением из таблицы и предположениями модели.
|
||||
@@ -0,0 +1,5 @@
|
||||
target
|
||||
**/target
|
||||
**/__pycache__
|
||||
**/.pytest_cache
|
||||
*.pyc
|
||||
@@ -0,0 +1,960 @@
|
||||
# This file is automatically @generated by Cargo.
|
||||
# It is not intended for manual editing.
|
||||
version = 4
|
||||
|
||||
[[package]]
|
||||
name = "aho-corasick"
|
||||
version = "1.1.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
|
||||
dependencies = [
|
||||
"memchr",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "anysystem"
|
||||
version = "0.3.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "45e46c0661abb7180e7b9c281db115305d49ca1709ab8242adf09666d2173c65"
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.59.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
|
||||
dependencies = [
|
||||
"windows-targets",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.61.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e201184e40b2ede64bc2ea34968b28e33622acdbbf37104f0e4a33f7abe657aa"
|
||||
dependencies = [
|
||||
"windows-link",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm",
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
|
||||
[[package]]
|
||||
name = "winnow"
|
||||
version = "0.7.13"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "21a0236b59786fed61e2a80582dd500fe61f18b5dca67a4a067d0bc9039339cf"
|
||||
dependencies = [
|
||||
"memchr",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "zerocopy"
|
||||
version = "0.8.27"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0894878a5fa3edfd6da3f88c4805f4c8558e2b996227a3d864f47fe11e38282c"
|
||||
dependencies = [
|
||||
"zerocopy-derive",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "zerocopy-derive"
|
||||
version = "0.8.27"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "88d2b8d9c68ad2b9e4340d7832716a4d21a22a1154777ad56ea55c51a9cf3831"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn 2.0.106",
|
||||
]
|
||||
@@ -0,0 +1,12 @@
|
||||
[package]
|
||||
name = "distsys-gossip"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
resolver = "3"
|
||||
|
||||
[dependencies]
|
||||
anysystem = "=0.3.0"
|
||||
clap = { version = "3.1.17", features = ["cargo", "derive"] }
|
||||
serde = { version = "1.0", features = ["derive"] }
|
||||
serde_json = "1.0"
|
||||
sugars = "3"
|
||||
@@ -0,0 +1,19 @@
|
||||
# syntax=docker/dockerfile:1
|
||||
FROM rust:1.97.1-bookworm@sha256:0e2bcaef56d041a486784e54104a81aebe0da44bd03019bd70bc0401e42e4a97 AS builder
|
||||
|
||||
RUN apt-get update && apt-get install -y build-essential python3-dev
|
||||
|
||||
WORKDIR /simulator
|
||||
COPY . .
|
||||
RUN --mount=type=cache,id=distsys-course-cargo-registry,target=/usr/local/cargo/registry,sharing=locked \
|
||||
--mount=type=cache,id=distsys-course-cargo-target-rust-1-97-1,target=/simulator/target,sharing=locked \
|
||||
cargo install --locked --path . --root /opt/course
|
||||
|
||||
FROM debian:bookworm-slim
|
||||
|
||||
RUN apt-get update && apt-get install -y python3-dev && rm -rf /var/lib/apt/lists/*
|
||||
|
||||
COPY --from=builder /opt/course/bin/distsys-gossip /usr/local/bin/distsys-gossip
|
||||
|
||||
WORKDIR /impl
|
||||
ENTRYPOINT ["distsys-gossip"]
|
||||
@@ -0,0 +1,204 @@
|
||||
use std::env;
|
||||
|
||||
use clap::{CommandFactory, ErrorKind, Parser};
|
||||
use serde::Serialize;
|
||||
use sugars::boxed;
|
||||
|
||||
use anysystem::python::PyProcessFactory;
|
||||
use anysystem::{Message, System};
|
||||
|
||||
// CLI -----------------------------------------------------------------------------------------------------------------
|
||||
|
||||
/// Gossip simulator.
|
||||
#[derive(Parser, Debug)]
|
||||
#[clap(about, long_about = None)]
|
||||
struct Args {
|
||||
/// Path to Python file with process implementations.
|
||||
#[clap(long = "impl", short)]
|
||||
impl_path: String,
|
||||
|
||||
/// Number of nodes.
|
||||
#[clap(long, short, default_value = "10")]
|
||||
nodes: u32,
|
||||
|
||||
/// Network drop rate.
|
||||
#[clap(long, short, default_value = "0")]
|
||||
drop_rate: f64,
|
||||
|
||||
/// Fan-out (how many peers to contact on each round).
|
||||
#[clap(long, short, default_value = "1")]
|
||||
fanout: u32,
|
||||
|
||||
/// Stop simulation when all nodes delivered info.
|
||||
#[clap(long, short)]
|
||||
quick_mode: bool,
|
||||
|
||||
/// Time limit in simulation.
|
||||
#[clap(long, short, default_value = "60")]
|
||||
time_limit: u32,
|
||||
|
||||
/// Random seed.
|
||||
#[clap(long, short, default_value = "123")]
|
||||
seed: u64,
|
||||
}
|
||||
|
||||
impl Args {
|
||||
fn validate(&self) -> Result<(), &'static str> {
|
||||
if self.nodes < 2 {
|
||||
return Err("--nodes must be at least 2");
|
||||
}
|
||||
if self.fanout == 0 || self.fanout >= self.nodes {
|
||||
return Err("--fanout must be between 1 and nodes - 1");
|
||||
}
|
||||
if !(0.0..=1.0).contains(&self.drop_rate) {
|
||||
return Err("--drop-rate must be a finite number between 0 and 1");
|
||||
}
|
||||
if self.time_limit == 0 {
|
||||
return Err("--time-limit must be positive");
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
// MAIN ----------------------------------------------------------------------------------------------------------------
|
||||
|
||||
fn main() {
|
||||
let args = Args::parse();
|
||||
if let Err(message) = args.validate() {
|
||||
Args::command()
|
||||
.error(ErrorKind::ValueValidation, message)
|
||||
.exit();
|
||||
}
|
||||
env::set_var("PYTHONHASHSEED", args.seed.to_string());
|
||||
let proc_factory = PyProcessFactory::new(&args.impl_path, "Peer");
|
||||
println!("Nodes: {}", args.nodes);
|
||||
println!("Fanout: {}", args.fanout);
|
||||
println!("Network drop rate: {}", args.drop_rate);
|
||||
println!("Implementation: {}", args.impl_path);
|
||||
println!("Seed: {}", args.seed);
|
||||
println!("Time limit: {}", args.time_limit);
|
||||
println!("Quick mode: {}", args.quick_mode);
|
||||
|
||||
let mut sys = build_system(
|
||||
proc_factory,
|
||||
args.nodes,
|
||||
args.drop_rate,
|
||||
args.fanout,
|
||||
args.seed,
|
||||
);
|
||||
sys.send_local_message(
|
||||
"0",
|
||||
Message::json(
|
||||
"BROADCAST",
|
||||
&BroadcastMessage {
|
||||
info: "Some very important information to propagate to all nodes",
|
||||
},
|
||||
),
|
||||
);
|
||||
println!(
|
||||
"\n{:<10} {:<12} {:<12} {:<12}",
|
||||
"time", "delivered", "stopped", "messages"
|
||||
);
|
||||
let mut first_full_coverage = None;
|
||||
let (reason, delivered, stopped) = loop {
|
||||
let more_events = sys.step_for_duration(1.);
|
||||
let (delivered, stopped) = get_stats(&sys);
|
||||
println!(
|
||||
"{:<10} {:<12} {:<12} {:<12}",
|
||||
sys.time(),
|
||||
delivered,
|
||||
stopped,
|
||||
sys.network().network_message_count()
|
||||
);
|
||||
// Capture the first printed full-coverage sample, before any later traffic.
|
||||
if delivered == args.nodes && first_full_coverage.is_none() {
|
||||
first_full_coverage = Some((sys.time(), sys.network().network_message_count()));
|
||||
}
|
||||
if !more_events {
|
||||
break ("no pending events", delivered, stopped);
|
||||
}
|
||||
if args.quick_mode && delivered == args.nodes {
|
||||
break ("full coverage (--quick-mode)", delivered, stopped);
|
||||
}
|
||||
if sys.time() >= args.time_limit as f64 {
|
||||
break ("time limit reached", delivered, stopped);
|
||||
}
|
||||
};
|
||||
println!("\nFinished: {}", reason);
|
||||
println!(
|
||||
"Final state: time={}, delivered={}/{}, stopped={}, messages={}",
|
||||
sys.time(),
|
||||
delivered,
|
||||
args.nodes,
|
||||
stopped,
|
||||
sys.network().network_message_count()
|
||||
);
|
||||
match first_full_coverage {
|
||||
Some((time, messages)) => println!(
|
||||
"First full-coverage sample: time={}, messages={} (sampled every 1 time unit)",
|
||||
time, messages
|
||||
),
|
||||
None => println!("Full coverage: not reached"),
|
||||
}
|
||||
let sent_counts: Vec<u64> = sys
|
||||
.process_names()
|
||||
.iter()
|
||||
.map(|p| sys.sent_message_count(p))
|
||||
.collect();
|
||||
println!(
|
||||
"\nMessages sent by each node: max={}, min={}, mean={:.2}",
|
||||
sent_counts.iter().max().unwrap(),
|
||||
sent_counts.iter().min().unwrap(),
|
||||
sent_counts.iter().sum::<u64>() as f64 / sent_counts.len() as f64
|
||||
)
|
||||
}
|
||||
|
||||
// UTILS ---------------------------------------------------------------------------------------------------------------
|
||||
|
||||
#[derive(Serialize)]
|
||||
struct StartMessage {}
|
||||
|
||||
#[derive(Serialize)]
|
||||
struct BroadcastMessage<'a> {
|
||||
info: &'a str,
|
||||
}
|
||||
|
||||
fn build_system(
|
||||
proc_factory: PyProcessFactory,
|
||||
nodes: u32,
|
||||
drop_rate: f64,
|
||||
fanout: u32,
|
||||
seed: u64,
|
||||
) -> System {
|
||||
let mut sys = System::new(seed);
|
||||
sys.network().set_delay(0.1);
|
||||
sys.network().set_drop_rate(drop_rate);
|
||||
for proc_id in 0..nodes {
|
||||
// process and node on which it runs have the same name
|
||||
let name = proc_id.to_string();
|
||||
sys.add_node(&name);
|
||||
let proc = proc_factory.build((proc_id, nodes, fanout), seed);
|
||||
sys.add_process(&name, boxed!(proc), &name);
|
||||
sys.send_local_message(&name, Message::json("START", &StartMessage {}))
|
||||
}
|
||||
sys
|
||||
}
|
||||
|
||||
fn get_stats(sys: &System) -> (u32, u32) {
|
||||
let mut delivered_count = 0;
|
||||
let mut stopped_count = 0;
|
||||
for proc in sys.process_names() {
|
||||
let outbox = sys.local_outbox(&proc);
|
||||
let msg_count = outbox.len();
|
||||
if msg_count > 0 {
|
||||
assert_eq!(outbox.first().unwrap().tip, "DELIVER");
|
||||
delivered_count += 1;
|
||||
}
|
||||
if msg_count == 2 {
|
||||
assert_eq!(outbox.get(1).unwrap().tip, "STOPPED");
|
||||
stopped_count += 1;
|
||||
}
|
||||
assert!(msg_count <= 2);
|
||||
}
|
||||
(delivered_count, stopped_count)
|
||||
}
|
||||
Reference in New Issue
Block a user