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8ab33669e2
This avoids a bunch of list bookkeeping in cases where we are iterating only for a side effect and do not care about the results. I would have named this iter() to match OCaml's list.iter(), but unfortunately iter() is a Python builtin. PiperOrigin-RevId: 736859418
355 lines
10 KiB
Python
355 lines
10 KiB
Python
# Copyright 2024 The JAX Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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from dataclasses import dataclass, field
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from typing import Any, Callable, Protocol, Sequence
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import numpy as np
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import jax.numpy as jnp
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from jax.sharding import NamedSharding
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from jax._src import api
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from jax._src import core
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from jax._src import source_info_util
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from jax._src import traceback_util
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from jax._src import util
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from jax._src.api import make_jaxpr
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from jax._src.interpreters.partial_eval import dce_jaxpr
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from jax._src.mesh import AbstractMesh, Mesh
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from jax._src.tree_util import broadcast_prefix, tree_flatten, tree_unflatten, tree_map
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from jax._src.util import foreach
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from jax.experimental import shard_map
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ShapeDtypeStructTree = Any
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map = util.safe_map
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@dataclass(frozen=True, slots=True, kw_only=True)
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class RooflineRuleContext:
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name_stack: source_info_util.NameStack
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primitive: core.Primitive
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avals_in: Sequence[core.AbstractValue]
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avals_out: Sequence[core.AbstractValue]
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jaxpr_eqn_ctx: core.JaxprEqnContext
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mesh: Mesh | AbstractMesh | None
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pin_lhs_in_vmem: bool
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pin_rhs_in_vmem: bool
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@dataclass(frozen=True, slots=True, kw_only=True)
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class RooflineShape:
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shape: tuple[int, ...]
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dtype: np.dtype
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@classmethod
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def from_aval(cls, aval: core.AbstractValue) -> "RooflineShape":
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if not isinstance(aval, core.ShapedArray):
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raise TypeError(f"Expected ShapedArray, got {type(aval)}.")
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if not isinstance(aval.dtype, np.dtype):
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raise TypeError(f"Expected numpy dtype, got {type(aval.dtype)}.")
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return cls(shape=aval.shape, dtype=aval.dtype)
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@property
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def size(self) -> int:
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return int(np.prod(self.shape))
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@property
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def bytes(self) -> int:
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return int(self.size * self.dtype.itemsize)
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@classmethod
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def total_bytes(cls, avals: Sequence[core.AbstractValue]) -> int:
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return sum(cls.from_aval(aval).bytes for aval in avals)
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@dataclass(frozen=True, slots=True, kw_only=True)
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class RooflineResult:
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flops: int = 0
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unfused_flops: int = 0
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ici_bytes: dict[str, int] = field(default_factory=dict)
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ici_latency: dict[str, int] = field(default_factory=dict)
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hbm_bytes: int = 0
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peak_hbm_bytes: int = 0
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unfused_hbm_bytes: int = 0
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@classmethod
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def zeros(cls) -> "RooflineResult":
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return cls()
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def __add__(self, other: "RooflineResult") -> "RooflineResult":
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def merge_ici_dicts(d1: dict[str, int], d2: dict[str, int]) -> dict[str, int]:
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return {k: d1.get(k, 0) + d2.get(k, 0) for k in set(d1) | set(d2)}
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return RooflineResult(
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flops=self.flops + other.flops,
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unfused_flops=self.unfused_flops + other.unfused_flops,
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ici_bytes=merge_ici_dicts(self.ici_bytes, other.ici_bytes),
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ici_latency=merge_ici_dicts(self.ici_latency, other.ici_latency),
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hbm_bytes=self.hbm_bytes + other.hbm_bytes,
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peak_hbm_bytes=max(self.peak_hbm_bytes, other.peak_hbm_bytes),
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unfused_hbm_bytes=self.unfused_hbm_bytes + other.unfused_hbm_bytes,
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)
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def __mul__(self, constant: int | float) -> "RooflineResult":
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return RooflineResult(
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flops=int(self.flops * constant),
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unfused_flops=int(self.unfused_flops * constant),
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ici_bytes={k: int(v * constant) for k, v in self.ici_bytes.items()},
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ici_latency={k: int(v * constant) for k, v in self.ici_latency.items()},
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hbm_bytes=int(self.hbm_bytes * constant),
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peak_hbm_bytes=int(self.peak_hbm_bytes * constant),
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unfused_hbm_bytes=int(self.unfused_hbm_bytes * constant),
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)
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def __rmul__(self, constant: int | float) -> "RooflineResult":
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return self.__mul__(constant)
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class _RooflineRule(Protocol):
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def __call__(
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self, ctx: RooflineRuleContext, *args: RooflineShape, **kw
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) -> RooflineResult: ...
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_rooflines: dict[core.Primitive, _RooflineRule] = {}
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def _roofline_interpreter(
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f_name: str,
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jaxpr: core.Jaxpr,
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mesh: Mesh | AbstractMesh,
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*,
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pin_lhs_in_vmem: bool = False,
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pin_rhs_in_vmem: bool = False,
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) -> RooflineResult:
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name_stack = source_info_util.new_name_stack(util.wrap_name(f_name, "roofline"))
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result = RooflineResult.zeros()
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env: dict[core.Var, RooflineShape] = {}
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def write(v: core.Var, node: RooflineShape):
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assert node is not None
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env[v] = node
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def read(v: core.Atom) -> RooflineShape:
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if type(v) is core.Literal:
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return RooflineShape.from_aval(core.abstractify(v.val))
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else:
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assert isinstance(v, core.Var)
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return env[v]
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def aval(v: core.Atom) -> core.AbstractValue:
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if type(v) is core.Literal:
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return core.abstractify(v.val)
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else:
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return v.aval
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def calculate_peak_hbm_bytes() -> int:
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return int(
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sum(np.prod(shape.shape) * shape.dtype.itemsize for shape in env.values())
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)
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jaxpr = jaxpr.jaxpr if isinstance(jaxpr, core.ClosedJaxpr) else jaxpr
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make_roofline_shape = lambda x: RooflineShape.from_aval(aval(x))
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foreach(
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write,
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jaxpr.constvars,
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map(make_roofline_shape, jaxpr.constvars),
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)
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foreach(write, jaxpr.invars, map(make_roofline_shape, jaxpr.invars))
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last_used = core.last_used(jaxpr)
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for eqn in jaxpr.eqns:
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source_info = eqn.source_info.replace(
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name_stack=name_stack + eqn.source_info.name_stack
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)
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with source_info_util.user_context(
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eqn.source_info.traceback, name_stack=source_info.name_stack
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):
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if "jaxpr" in eqn.params:
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result += _roofline_interpreter(
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util.wrap_name(f_name, eqn.primitive.name),
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eqn.params["jaxpr"],
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mesh,
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pin_lhs_in_vmem=pin_lhs_in_vmem,
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pin_rhs_in_vmem=pin_rhs_in_vmem,
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)
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else:
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if eqn.primitive not in _rooflines:
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msg = f"No roofline rule for {eqn.primitive}."
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for attr in dir(eqn):
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if not attr.startswith("_"):
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msg += f"\n{attr}: {getattr(eqn, attr)}"
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raise NotImplementedError(msg)
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rule = _rooflines[eqn.primitive]
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result += rule(
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RooflineRuleContext(
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name_stack=source_info.name_stack,
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primitive=eqn.primitive,
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avals_in=map(aval, eqn.invars),
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avals_out=map(aval, eqn.outvars),
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jaxpr_eqn_ctx=eqn.ctx,
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mesh=mesh,
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pin_lhs_in_vmem=pin_lhs_in_vmem,
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pin_rhs_in_vmem=pin_rhs_in_vmem,
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),
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*map(read, eqn.invars),
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**eqn.params,
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)
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foreach(write, eqn.outvars, map(make_roofline_shape, eqn.outvars))
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core.clean_up_dead_vars(eqn, env, last_used)
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result += RooflineResult(peak_hbm_bytes=calculate_peak_hbm_bytes())
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return result
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def _f_with_vjp(f: Callable):
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@util.wraps(f)
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def wrapped(*args):
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primals, f_vjp = api.vjp(f, *args)
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return f_vjp(tree_map(jnp.bfloat16, primals))
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return wrapped
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def roofline(
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f: Callable,
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mesh: Mesh | AbstractMesh | None = None,
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in_specs: shard_map.Specs | None = None,
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out_specs: shard_map.Specs | None = None,
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*,
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pin_lhs_in_vmem: bool = False,
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pin_rhs_in_vmem: bool = False,
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vjp: bool = False,
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print_jaxpr: bool = False,
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) -> Callable[..., tuple[ShapeDtypeStructTree, RooflineResult]]:
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@util.wraps(f)
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@traceback_util.api_boundary
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def wrapped(*args):
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wrapped_f = f
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if in_specs is not None and out_specs is not None and mesh is not None:
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wrapped_f = shard_map.shard_map(wrapped_f, mesh, in_specs, out_specs)
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if vjp:
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wrapped_f = _f_with_vjp(wrapped_f)
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jaxpr, out_shapes = make_jaxpr(wrapped_f, return_shape=True)(*args)
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def make_sharded_shape_dtype_struct(
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shape: api.ShapeDtypeStruct, out_spec: shard_map.Specs
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) -> api.ShapeDtypeStruct:
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return api.ShapeDtypeStruct(
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shape.shape, shape.dtype, sharding=NamedSharding(mesh, out_spec) # type: ignore
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)
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if out_specs is not None and mesh is not None:
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out_specs_flat = broadcast_prefix(out_specs, out_shapes)
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flat_out_shapes, treedef = tree_flatten(out_shapes)
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flat_out_shapes = map(
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make_sharded_shape_dtype_struct, flat_out_shapes, out_specs_flat
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)
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out_shapes = tree_unflatten(treedef, flat_out_shapes)
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used_outputs = (True,) * len(jaxpr.jaxpr.outvars)
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jaxpr, _ = dce_jaxpr(jaxpr.jaxpr, used_outputs)
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shard_map_eqns = [
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e for e in jaxpr.eqns if e.primitive == shard_map.shard_map_p
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]
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if shard_map_eqns:
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try:
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jaxpr = shard_map_eqns[-1].params["jaxpr"]
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except KeyError:
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raise ValueError(f"Missing shard_map jaxpr in {jaxpr}.")
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if print_jaxpr:
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print(jaxpr)
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return out_shapes, _roofline_interpreter(
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util.fun_qual_name(f),
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jaxpr,
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mesh,
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pin_lhs_in_vmem=pin_lhs_in_vmem,
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pin_rhs_in_vmem=pin_rhs_in_vmem,
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)
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return wrapped
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def register_roofline(prim: core.Primitive):
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def register(rule: _RooflineRule):
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_rooflines[prim] = rule
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return rule
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return register
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def register_standard_roofline(prim: core.Primitive):
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def standard_rule(ctx: RooflineRuleContext, *args, **kwargs):
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return RooflineResult.zeros()
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_rooflines[prim] = standard_rule
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def roofline_and_grad(
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f: Callable,
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mesh: Mesh | AbstractMesh,
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in_specs: shard_map.Specs,
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out_specs: shard_map.Specs,
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*,
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pin_lhs_in_vmem: bool = False,
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pin_rhs_in_vmem: bool = False,
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print_jaxpr: bool = False,
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) -> Callable[..., tuple[ShapeDtypeStructTree, RooflineResult, RooflineResult]]:
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@util.wraps(f)
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@traceback_util.api_boundary
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def wrapped(*args):
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primal_shapes, fwd_result = roofline(
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f,
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mesh,
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in_specs,
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out_specs,
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pin_lhs_in_vmem=pin_lhs_in_vmem,
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pin_rhs_in_vmem=pin_rhs_in_vmem,
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print_jaxpr=print_jaxpr,
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)(*args)
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return (
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primal_shapes,
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fwd_result,
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roofline(
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f,
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mesh,
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in_specs,
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out_specs,
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pin_lhs_in_vmem=pin_lhs_in_vmem,
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pin_rhs_in_vmem=pin_rhs_in_vmem,
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vjp=True,
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print_jaxpr=print_jaxpr,
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)(
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*tree_map(
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lambda x: api.ShapeDtypeStruct(
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x.shape,
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jnp.int32 if x.dtype == jnp.int32 else jnp.bfloat16,
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sharding=x.sharding,
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),
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args,
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)
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)[1],
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)
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return wrapped
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