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Posted to commits@tvm.apache.org by GitBox <gi...@apache.org> on 2022/08/31 22:25:43 UTC
[GitHub] [tvm] nverke opened a new pull request, #12667: [Hexagon] Create tests to showcase vtcm loading capabilities on Hexagon.
nverke opened a new pull request, #12667:
URL: https://github.com/apache/tvm/pull/12667
Results from running a vrmpy operator that loads data onto vtcm before running.
Vec - Unroll(n // 8) and Vectorize(n // 64)
Para - Parallel(n // 4)
Pre - Preallocated VTCM buffers
Total Vrmpy Operations | Total Transfer (MB) | Without VTCM (Gops) | Basic VTCM Loads (Gops) | Vec Loads (Gops) | Vec + Para Loads (Gops) | Pre + Vec Loads (Gops) | Pre + Vec + Par Loads (Gops) | Single DMA Load (Gops) | Preloaded (Gops)
-- | -- | -- | -- | -- | -- | -- | -- | -- | --
1024 | 0.39 | 95.0256 | 0.345 | 0.5408 | 0.5905 | 44.4814 | 32.8886 | 15.0813 | 124.7117
2048 | 0.79 | 124.2389 | 0.4002 | 0.7063 | 0.8826 | 43.5238 | 47.2871 | 16.1339 | 209.2688
4096 | 1.57 | 41.5497 | 0.4215 | 0.8664 | 1.1977 | 10.9374 | 26.5749 | 18.1754 | 241.1628
10240 | 3.93 | 33.2139 | 0.4419 | 1.0506 | 1.7311 | 11.7886 | 34.0405 | 25.4214 | 370.2948
16384 | 6.29 | 20.7683 | 0.4195 | 1.0568 | 1.898 | 7.7292 | 22.5898 | 29.7011 | 397.4137
20480 | 7.86 | 20.2128 | 0.4406 | 1.069 | 1.9779 | 6.6829 | 17.7941 | 25.4929 | 338.294
Results from copying data to vtcm with various strategies
(Factors were Unroll(n // 2), Vectorize(n // 128), Parallel(n // 4))
Total Transfer (MB) | Base (GBps) | Unroll + Vectorize (GBps) | Unroll + Vectorize + Parallel (GBps) | Single DMA (GBps)
-- | -- | -- | -- | --
0.01 | 2.2122 | 15.9211 | 4.8287 | 2.2524
0.02 | 2.3207 | 26.1998 | 9.5082 | 4.6669
0.04 | 2.4425 | 38.1089 | 17.5147 | 6.4492
0.08 | 2.5067 | 48.5949 | 32.507 | 9.1469
0.16 | 2.5507 | 57.6021 | 55.1855 | 11.1598
0.31 | 2.7053 | 62.8063 | 83.4726 | 15.2878
0.62 | 2.9199 | 74.3696 | 114.7925 | 17.6438
1 | 2.2645 | 49.8653 | 63.8026 | 18.8814
2 | 1.1232 | 10.3933 | 29.1977 | 20.6719
4 | 1.0683 | 9.6105 | 26.5143 | 25.201
8 | 0.6814 | 6.1916 | 24.049 | 26.1883
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[GitHub] [tvm] csullivan commented on a diff in pull request #12667: [Hexagon] Create tests to showcase vtcm loading capabilities on Hexagon.
Posted by GitBox <gi...@apache.org>.
csullivan commented on code in PR #12667:
URL: https://github.com/apache/tvm/pull/12667#discussion_r961843767
##########
python/tvm/contrib/hexagon/session.py:
##########
@@ -58,7 +58,7 @@ def __init__(
remote_kw: dict,
session_name: str = "hexagon-rpc",
remote_stack_size_bytes: int = 256 * 1024, # Min size for main thread in QuRT/sim
- rpc_receive_buffer_size_bytes: int = 5 * 1024 * 1024, # Size for passing hexagon tests
+ rpc_receive_buffer_size_bytes: int = 1024 * 1024 * 1024, # Size for passing hexagon tests
Review Comment:
Left over from testing? A gigabyte for the rpc buffer can impact available memory for model execution
##########
tests/python/contrib/test_hexagon/test_vtcm_bandwidth.py:
##########
@@ -0,0 +1,169 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+"""Test theoretical bandwith for data transfers to VTCM for different strategies."""
+
+import numpy as np
+from tests.python.contrib.test_hexagon.infrastructure import allocate_hexagon_array
+import tvm
+
+from tvm.script import tir as T
+from numpy.random import default_rng
+
+MB = 1024**2
+KB = 1024
+TEST_OUTPUT_TEMPLATE = "Test bandwidth with buffer size {}MB... \n -Base: {} GBps \n -Vectorized: {} GBps\n -Vectorized and Parallelized: {} GBps\n -Single DMA Copy: {} GBps\n"
+
+
+def memcopy_operator(size):
+ @T.prim_func
+ def operator(a: T.handle, a_v: T.handle) -> None:
+ A = T.match_buffer(a, size, dtype="int8", align=128, scope="global")
+ A_global_vtcm = T.match_buffer(a_v, size, dtype="int8", align=128, scope="global.vtcm")
+ for ax0 in T.serial(size):
+ with T.block("A_global.vtcm"):
+ v0 = T.axis.spatial(size, ax0)
+ T.reads(A[v0])
+ T.writes(A_global_vtcm[v0])
+ A_global_vtcm[v0] = A[v0]
+
+ return operator
+
+
+def single_dma_operator(size):
+ @T.prim_func
+ def operator(a: T.handle, a_v: T.handle) -> None:
+ A = T.match_buffer(a, size, dtype="int8", align=128, scope="global")
+ A_global_vtcm = T.match_buffer(a_v, size, dtype="int8", align=128, scope="global.vtcm")
Review Comment:
A nice follow up would to support measuring the bandwidth in both directions (ddr->vtcm and vtcm->ddr) given that in tests we saw a significant perf asymmetry and making that easily reproducible can help the QC experts debug or provide us insights.
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[GitHub] [tvm] tmoreau89 merged pull request #12667: [Hexagon] Create tests to showcase vtcm loading capabilities on Hexagon.
Posted by GitBox <gi...@apache.org>.
tmoreau89 merged PR #12667:
URL: https://github.com/apache/tvm/pull/12667
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[GitHub] [tvm] tmoreau89 commented on pull request #12667: [Hexagon] Create tests to showcase vtcm loading capabilities on Hexagon.
Posted by GitBox <gi...@apache.org>.
tmoreau89 commented on PR #12667:
URL: https://github.com/apache/tvm/pull/12667#issuecomment-1233484224
Very neat work @nverke ! CC @masahi @kparzysz-quic
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[GitHub] [tvm] tmoreau89 commented on pull request #12667: [Hexagon] Create tests to showcase vtcm loading capabilities on Hexagon.
Posted by GitBox <gi...@apache.org>.
tmoreau89 commented on PR #12667:
URL: https://github.com/apache/tvm/pull/12667#issuecomment-1245968374
Thank you @csullivan and @nverke for the PR; it's been merged!
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