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计算分配内存

计算分配内存#

import set_env

import tvm
from tvm import tir
from tvm.script import tir as T

@tvm.script.ir_module
class Module:
    @T.prim_func
    def scale_by_two(a: T.Buffer((128,), "int8"), c: T.Buffer((128,), "int8")):
        for i in T.serial(128):
            with T.block("C"):
                c[i] = a[i] * T.int8(2)


    @T.prim_func
    def scale_by_two_three(a: T.Buffer((128,), "int8"), c: T.Buffer((128,), "int8")):
        B = T.alloc_buffer([128], dtype="int8", scope="global.vtcm")
        for i in T.serial(128):
            with T.block("B"):
                B[i] = a[i] * T.int8(2)
        for i in T.serial(128):
            with T.block("C"):
                c[i] = B[i] * T.int8(3)

计算每个 scope 内存分配#

for primFunc, size in [(Module["scale_by_two"], 128), (Module["scale_by_two_three"], 256)]:
    mod = tvm.IRModule.from_expr(primFunc.with_attr("global_symbol", "main"))
    sch = tir.Schedule(mod, debug_mask="all")
    block_c = sch.get_block("C")
    (flat,) = sch.get_loops(block_c)
    cache_block = sch.cache_read(block_c, 0, storage_scope="global.vtcm")
    sch.compute_at(cache_block, flat)

    mod = sch.mod
    mod = tvm.tir.transform.ConvertBlocksToOpaque()(mod)
    mod = tvm.tir.transform.LowerOpaqueBlock()(mod)
    sizes = tvm.tir.analysis.calculate_allocated_bytes(mod["main"])
    assert "main" in sizes, 'Calls with PrimFunc is expected to return with function key as "main"'
    sizes = sizes["main"]
    assert sizes.get("global.vtcm", 0) == size

计算混合 scope 的内存分配#

test_scale_by

@T.prim_func
def matmul_mix_scope(a: T.handle, b: T.handle, c: T.handle) -> None:
    A = T.match_buffer(a, [128, 128], scope="global")
    B = T.match_buffer(b, [128, 128], scope="global")
    C = T.match_buffer(c, [128, 128], scope="global")
    A_allocated = T.alloc_buffer([128, 128], dtype="float32", scope="global.texture")
    B_allocated = T.alloc_buffer([128, 128], dtype="float32", scope="global.texture")
    C_allocated = T.alloc_buffer([128, 128], dtype="float32", scope="global")

    for i, j in T.grid(128, 128):
        with T.block("A.allocated"):
            A_allocated[i, j] = A[i, j]
    for i, j in T.grid(128, 128):
        with T.block("B.allocated"):
            B_allocated[i, j] = B[i, j]

    for i, j, k in T.grid(128, 128, 128):
        with T.block("update"):
            vi, vj, vk = T.axis.remap("SSR", [i, j, k])
            with T.init():
                C_allocated[vi, vj] = 0.0
            C_allocated[vi, vj] = C[vi, vj] + A_allocated[vi, vk] * B_allocated[vj, vk]

    for i, j in T.grid(128, 128):
        with T.block("C"):
            C[i, j] = C_allocated[i, j]

groups = [("global", 65536), ("global.texture", 131072), ("global.texture-nhwc", 0)]

for scope, size in groups:
    mod = tvm.IRModule({"main": matmul_mix_scope})
    mod = tvm.tir.transform.LowerInitBlock()(mod)
    mod = tvm.tir.transform.ConvertBlocksToOpaque()(mod)
    mod = tvm.tir.transform.LowerOpaqueBlock()(mod)
    sizes = tvm.tir.analysis.calculate_allocated_bytes(mod["main"])
    assert "main" in sizes, 'Calls with PrimFunc is expected to return with function key as "main"'
    sizes = sizes["main"]
    assert sizes.get(scope, 0) == size

full_mod_calculator#

def apply_schedule(sch, func_name):
    sch.work_on(func_name)
    block_c = sch.get_block("C")
    sch.cache_read(block_c, 0, storage_scope="global.vtcm")

sch = tvm.tir.Schedule(Module, debug_mask="all")
apply_schedule(sch, "scale_by_two")
apply_schedule(sch, "scale_by_two_three")
mod = tvm.tir.transform.ConvertBlocksToOpaque()(sch.mod)
mod = tvm.tir.transform.LowerOpaqueBlock()(mod)
sizes = tvm.tir.analysis.calculate_allocated_bytes(mod)
assert "scale_by_two" in sizes, "Values for scale_by_two not found"
scale_by_two_sizes = sizes["scale_by_two"]
assert (
    "global.vtcm" in scale_by_two_sizes
), "Expected global.vtcm allocation to be calculated scale_by_two"
assert scale_by_two_sizes["global.vtcm"] == 128, "Expected the calculated size to be 128"
scale_by_two_three_sizes = sizes["scale_by_two_three"]
assert (
    "global.vtcm" in scale_by_two_three_sizes
), "Expected global.vtcm allocation to be calculated scale_by_two_three"
assert scale_by_two_three_sizes["global.vtcm"] == 256, "Expected the calculated size to be 256"
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