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374 lines
13 KiB
374 lines
13 KiB
5 months ago
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import functools
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import re
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from collections import deque
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from dataclasses import dataclass
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from typing import Dict, List
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from torch.autograd import _KinetoEvent
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from torch.autograd.profiler import profile
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from torch.profiler import DeviceType
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def _traverse(tree, next_fn, children_fn=lambda x: x.children, reverse: bool = False):
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order = reversed if reverse else lambda x: x
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remaining = deque(order(tree))
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while remaining:
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curr_event = next_fn(remaining)
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yield curr_event
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for child_event in order(children_fn(curr_event)):
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remaining.append(child_event)
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traverse_dfs = functools.partial(_traverse, next_fn=lambda x: x.pop(), reverse=True)
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traverse_bfs = functools.partial(
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_traverse, next_fn=lambda x: x.popleft(), reverse=False
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)
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@dataclass
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class EventMetrics:
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duration_time_ns: int = 0
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self_time_ns: int = 0
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idle_time_ns: int = 0
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queue_depth: int = 0
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@property
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def fraction_idle_time(self):
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if self.duration_time_ns == 0:
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return 0.0
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return self.idle_time_ns / self.duration_time_ns
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@dataclass
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class Interval:
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start: int
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end: int
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queue_depth: int = 0
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class EventKey:
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def __init__(self, event):
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self.event = event
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def __hash__(self):
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return hash(self.event.id)
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def __eq__(self, other):
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return self.event.id == other.event.id
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def __repr__(self):
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return f"{self.event.name}"
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def intervals_overlap(self, intervals: List[Interval]):
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overlap_time = 0
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intervals = sorted(intervals, key=lambda x: x.start)
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if intervals:
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overlap_start = max(self.event.start_time_ns, intervals[0].start)
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overlap_end = min(self.event.end_time_ns, intervals[0].end)
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if overlap_start < overlap_end:
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overlap_time += overlap_end - overlap_start
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i, j = 0, 1
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while j < len(intervals):
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prev_interval = intervals[i]
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curr_interval = intervals[j]
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j += 1
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if prev_interval.end > curr_interval.start:
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# Completely subsumed by previous interval
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if prev_interval.end > curr_interval.end:
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j += 1
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continue
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else:
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curr_interval.start = prev_interval.end
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i = j
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overlap_start = max(self.event.start_time_ns, curr_interval.start)
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overlap_end = min(self.event.end_time_ns, curr_interval.end)
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if overlap_start < overlap_end:
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overlap_time += overlap_end - overlap_start
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return overlap_time
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class BasicEvaluation:
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def __init__(self, prof: profile):
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self.profile = prof
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self.metrics: Dict[EventKey, EventMetrics] = {}
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self.compute_self_time()
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self.event_keys = sorted(
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(e for e in self.metrics.keys()), key=lambda x: x.event.start_time_ns
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)
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self.events = [e.event for e in self.event_keys]
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self.cuda_events: List[_KinetoEvent] = []
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self.queue_depth_list = self.compute_queue_depth()
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self.compute_idle_time()
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def compute_self_time(self):
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"""
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Computes event's self time(total time - time in child ops).
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"""
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assert self.profile.kineto_results is not None
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stack = deque(self.profile.kineto_results.experimental_event_tree())
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# standard iterating dfs
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while stack:
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curr_event = stack.pop()
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self_time = curr_event.duration_time_ns
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for child_event in curr_event.children:
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self_time -= child_event.duration_time_ns
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stack.append(child_event)
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assert (
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EventKey(curr_event) not in self.metrics
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), f"Duplicate id: {curr_event.id}, {curr_event.name}"
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self.metrics[EventKey(curr_event)] = EventMetrics(self_time_ns=self_time)
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self.metrics[
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EventKey(curr_event)
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].duration_time_ns = curr_event.duration_time_ns
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def compute_queue_depth(self):
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"""
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Computes queue_depth at each event. This will calculate the queue depth data for
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All the events in the tree.
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This will return a list of Interval of queue depth data of cuda launch and kernels.
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"""
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assert self.profile.kineto_results is not None
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cuda_event_list = self.profile.kineto_results.events()
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def is_cuda_launch_kernel(e):
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# TODO: find a better way to identify cudaLaunchKernel
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return e.name == "cudaLaunchKernel"
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def is_cuda_kernel(e):
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# TODO: find a better way to identify CUDA Kernel
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return e.device_type() == DeviceType.CUDA and "mem" not in e.name.lower()
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cuda_launch_events = sorted(
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(e for e in cuda_event_list if is_cuda_launch_kernel(e)),
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key=lambda x: x.start_us(),
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)
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cuda_kernel_events = sorted(
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(e for e in cuda_event_list if is_cuda_kernel(e)),
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key=lambda x: x.start_us(),
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)
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self.cuda_events = sorted(
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cuda_launch_events + cuda_kernel_events, key=lambda x: x.start_us()
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)
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kernel_mapping: Dict[_KinetoEvent, int] = {}
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last_mapped_kernel = 0
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for cuda_launch_event in cuda_launch_events:
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index = index_of_first_match(
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cuda_kernel_events,
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lambda x: x.linked_correlation_id()
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== cuda_launch_event.linked_correlation_id(),
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start=last_mapped_kernel,
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)
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kernel_mapping[cuda_launch_event] = index
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last_mapped_kernel = index if index is not None else last_mapped_kernel
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current_kernel_index = 0
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spawned_kernel_index = -1
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all_events = cuda_launch_events + cuda_kernel_events + self.events
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def new_old_event_comparator(event):
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if hasattr(event, "start_us"):
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return event.start_us() * 1000
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if hasattr(event, "start_time_ns"):
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return event.start_time_ns
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raise Exception("Unknown Event Type")
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queue_depth_list: List[Interval] = []
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all_events.sort(key=new_old_event_comparator)
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for event in all_events:
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# Find latest cuda kernel event
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if hasattr(event, "start_us"):
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start_time = event.start_us() * 1000
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end_time = (event.start_us() + event.duration_us()) * 1000
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# Find current spawned cuda kernel event
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if event in kernel_mapping and kernel_mapping[event] is not None:
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spawned_kernel_index = kernel_mapping[event]
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elif hasattr(event, "start_time_ns"):
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start_time = event.start_time_ns # type: ignore[attr-defined]
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end_time = event.end_time_ns # type: ignore[attr-defined]
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while (
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current_kernel_index < len(cuda_kernel_events)
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and (cuda_kernel_events[current_kernel_index].start_us()) * 1000
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<= start_time # type: ignore[possibly-undefined]
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):
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current_kernel_index += 1
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current_queue_depth = spawned_kernel_index - current_kernel_index + 1
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current_queue_depth = max(current_queue_depth, 0)
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if hasattr(event, "start_us"):
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queue_depth_list.append(
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Interval(start_time, end_time, current_queue_depth) # type: ignore[possibly-undefined]
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)
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elif hasattr(event, "start_time_ns"):
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self.metrics[EventKey(event)].queue_depth = current_queue_depth
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return queue_depth_list
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def compute_idle_time(self):
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"""
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Computes idle time of the profile.
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"""
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# Based on queue_depth_list, we can calculate idle time for all the events
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idle = False
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idle_start = 0
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idle_intervals: List[Interval] = []
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if self.queue_depth_list and self.events:
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idle_intervals += [
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Interval(self.events[0].start_time_ns, self.queue_depth_list[0].start),
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Interval(self.queue_depth_list[-1].end, self.events[-1].end_time_ns),
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]
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for data_point in self.queue_depth_list:
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if data_point.queue_depth == 0 and not idle:
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idle_start = data_point.end
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idle = True
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if data_point.queue_depth > 0 and idle:
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idle_intervals.append(Interval(idle_start, data_point.start))
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idle = False
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event_list = [e.event for e in self.metrics.keys()]
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for event in event_list:
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self.metrics[EventKey(event)].idle_time_ns = EventKey(
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event
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).intervals_overlap(idle_intervals)
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def rank_events(self, length):
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"""
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Filter and Rank the events based on some heuristics:
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1) Events that are in the falling phase of the queue depth.
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2) Events that have a high idle_time, self_time difference.
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Parameters:
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length: The number of events to return.
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"""
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# Find the interval when qd is falling to 0
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import torch
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queue_depth_list = list(reversed(self.queue_depth_list))
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qd_values = [e.queue_depth for e in queue_depth_list]
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bottom_threashold = 0
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top_threashold = 4
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decrease_interval = []
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i = 0
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while i < len(qd_values):
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if qd_values[i] > bottom_threashold:
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i += 1
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continue
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for j in range(i + 1, len(qd_values)):
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# Find next zero and if the max value between them exceeds
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# the threshold, then we have a falling interval
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next_minimum_idx = index_of_first_match(
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qd_values, lambda x: x <= bottom_threashold, start=j
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)
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peak_idx = argmax(qd_values, start=j, end=next_minimum_idx)
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# if is a valid peak, we add to list and continue
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if peak_idx is not None and qd_values[peak_idx] >= top_threashold:
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decrease_interval.append(
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Interval(
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queue_depth_list[peak_idx].start, queue_depth_list[i].start
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)
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)
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i = next_minimum_idx if next_minimum_idx is not None else i
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break
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i += 1
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# Filter out events that are not in the decrease interval
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event_list = [
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event
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for event in self.metrics.keys()
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if event.intervals_overlap(decrease_interval)
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]
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if event_list:
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self_time = torch.tensor(
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[self.metrics[event].self_time_ns for event in event_list],
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dtype=torch.float32,
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)
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idle_time = torch.tensor(
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[self.metrics[event].fraction_idle_time for event in event_list],
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dtype=torch.float32,
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)
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normalized_gain = (idle_time - torch.mean(idle_time)) / torch.std(idle_time)
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normalized_self = (self_time - torch.mean(self_time)) / torch.std(self_time)
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heuristic_score_list = normalized_gain + 0.6 * normalized_self
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# Sort events by heuristic
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event_list = [
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event
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for _, event in sorted(
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zip(heuristic_score_list, event_list),
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key=lambda x: x[0],
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reverse=True,
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)
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]
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event_list = event_list[:length]
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return event_list
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def get_optimizable_events(self, length: int = 1, print_enable: bool = True):
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event_list = self.rank_events(length)
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if not print_enable:
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return event_list
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output = "Optimizable events:\n" if event_list else "No events to optimize\n"
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output += "\n".join(
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[
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f"""{'-'*80}
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Event: {event}
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Source code location: {source_code_location(event.event)}
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Percentage idle time: {self.metrics[event].fraction_idle_time * 100:.2f}%
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{'-'*80}"""
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for event in event_list
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]
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)
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if print_enable:
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print(output)
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return event_list
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def index_of_first_match(seq, predicate, start=0, end=None):
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if end is None or end >= len(seq):
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end = len(seq)
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for i in range(start, end):
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if predicate(seq[i]):
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return i
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return None
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def argmax(seq, key=lambda x: x, start=0, end=None):
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seq = seq[start:end]
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if len(seq) == 0:
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return None
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return seq.index(max(seq, key=key)) + start
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def source_code_location(event):
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while event is not None:
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match = re.search(r"\.py\(.*\)", event.name)
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if match is None:
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event = event.parent
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continue
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return event.name
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return "No source code location found"
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# Provide an OSS workaround for cudagraphs + CUPTI issue
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# https://github.com/pytorch/pytorch/issues/75504
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# TODO(dberard) - deprecate / remove workaround for CUDA >= 12, when
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# we stop supporting older CUDA versions.
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def _init_for_cuda_graphs():
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from torch.autograd.profiler import profile
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with profile():
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pass
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