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from __future__ import annotations
import logging
from collections import deque
import dask
from dask.utils import format_time, key_split, parse_timedelta
from distributed.diagnostics.plugin import SchedulerPlugin
from distributed.diagnostics.progress_stream import color_of
from distributed.metrics import time
logger = logging.getLogger(__name__)
class TaskStreamPlugin(SchedulerPlugin):
name = "task-stream"
def __init__(self, scheduler, maxlen=None):
if maxlen is None:
maxlen = max(
dask.config.get(
"distributed.scheduler.dashboard.status.task-stream-length"
),
dask.config.get(
"distributed.scheduler.dashboard.tasks.task-stream-length"
),
)
self.buffer = deque(maxlen=maxlen)
self.scheduler = scheduler
self.index = 0
def transition(self, key, start, finish, *args, **kwargs):
if start == "processing":
if key not in self.scheduler.tasks:
return
if not kwargs.get("startstops"):
# Other methods require `kwargs` to have a non-empty list of `startstops`
return
kwargs["key"] = key
if finish == "memory" or finish == "erred":
self.buffer.append(kwargs)
self.index += 1
def collect(self, start=None, stop=None, count=None):
def bisect(target, left, right):
if left == right:
return left
mid = (left + right) // 2
value = max(
startstop["stop"] for startstop in self.buffer[mid]["startstops"]
)
if value < target:
return bisect(target, mid + 1, right)
else:
return bisect(target, left, mid)
if isinstance(start, str):
start = time() - parse_timedelta(start)
if start is not None:
start = bisect(start, 0, len(self.buffer))
if isinstance(stop, str):
stop = time() - parse_timedelta(stop)
if stop is not None:
stop = bisect(stop, 0, len(self.buffer))
if count is not None:
if start is None and stop is None:
stop = len(self.buffer)
start = stop - count
elif start is None and stop is not None:
start = stop - count
elif start is not None and stop is None:
stop = start + count
if stop is None:
stop = len(self.buffer)
if start is None:
start = 0
start = max(0, start)
stop = min(stop, len(self.buffer))
return [self.buffer[i] for i in range(start, stop)]
def rectangles(self, istart, istop=None, workers=None, start_boundary=0):
msgs = []
diff = self.index - len(self.buffer)
if istop is None:
istop = self.index
for i in range(max(0, (istart or 0) - diff), istop - diff if istop else istop):
msg = self.buffer[i]
msgs.append(msg)
return rectangles(msgs, workers=workers, start_boundary=start_boundary)
def rectangles(msgs, workers=None, start_boundary=0):
if workers is None:
workers = {}
L_start = []
L_duration = []
L_duration_text = []
L_key = []
L_name = []
L_color = []
L_alpha = []
L_worker = []
L_worker_thread = []
L_y = []
for msg in msgs:
key = msg["key"]
name = key_split(key)
startstops = msg.get("startstops", [])
try:
worker_thread = "%s-%d" % (msg["worker"], msg["thread"])
except Exception:
continue
logger.warning("Message contained bad information: %s", msg, exc_info=True)
worker_thread = ""
if worker_thread not in workers:
workers[worker_thread] = len(workers) / 2
for startstop in startstops:
if startstop["start"] < start_boundary:
continue
color = colors[startstop["action"]]
if type(color) is not str:
color = color(msg)
L_start.append((startstop["start"] + startstop["stop"]) / 2 * 1000)
L_duration.append(1000 * (startstop["stop"] - startstop["start"]))
L_duration_text.append(format_time(startstop["stop"] - startstop["start"]))
L_key.append(key)
L_name.append(prefix[startstop["action"]] + name)
L_color.append(color)
L_alpha.append(alphas[startstop["action"]])
L_worker.append(msg["worker"])
L_worker_thread.append(worker_thread)
L_y.append(workers[worker_thread])
return {
"start": L_start,
"duration": L_duration,
"duration_text": L_duration_text,
"key": L_key,
"name": L_name,
"color": L_color,
"alpha": L_alpha,
"worker": L_worker,
"worker_thread": L_worker_thread,
"y": L_y,
}
def color_of_message(msg):
if msg["status"] == "OK":
split = key_split(msg["key"])
return color_of(split)
else:
return "black"
colors = {
"transfer": "red",
"disk-write": "orange",
"disk-read": "orange",
"deserialize": "gray",
"compute": color_of_message,
}
alphas = {
"transfer": 0.4,
"compute": 1,
"deserialize": 0.4,
"disk-write": 0.4,
"disk-read": 0.4,
}
prefix = {
"transfer": "transfer-",
"disk-write": "disk-write-",
"disk-read": "disk-read-",
"deserialize": "deserialize-",
"compute": "",
}
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