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Only output bo needs to be synced from device after result is available #849

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Only output bo needs to be synced from device after result is available #849

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1228cf7
Split the big building script into multiple stages: configure/build/i…
dezhiAmd Sep 20, 2024
9003f1f
small change
dezhiAmd Oct 15, 2024
ae3024c
Merge branch 'main' into buildDebug
Oct 18, 2024
c47b1c6
Sync only ofm bo
Oct 18, 2024
1fd9113
Remove unrelated build scripts
Oct 18, 2024
336c485
Fix a typo (copy & paste error)
Oct 19, 2024
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,7 @@ artifacts/

# Local cache files
llvm-external-projects/iree-dialects/.cache
.build-cache

# pkgci artifacts
artifacts/
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12 changes: 7 additions & 5 deletions runtime/src/iree-amd-aie/driver/xrt/direct_command_buffer.cc
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Expand Up @@ -333,11 +333,10 @@ static iree_status_t iree_hal_xrt_direct_command_buffer_dispatch(
// Third argument is the number of LX6 instructions.
run.set_arg(arg_index++, kernel_params.num_instr);

xrt::bo ofm_bo;

// Copy descriptors from all sets to the end of the current segment for later
// access.
// TODO(jornt): hack to ensure that the output buffer is synced by syncing all
// buffers after the run.
std::vector<xrt::bo> bos;
// TODO(max): do we need multiple descriptor sets ever for AIE?
uint32_t set = 0;
IREE_RETURN_AND_END_ZONE_IF_ERROR(
Expand All @@ -348,8 +347,11 @@ static iree_status_t iree_hal_xrt_direct_command_buffer_dispatch(
xrt::bo(*command_buffer->descriptor_sets[set].bindings[j],
command_buffer->descriptor_sets[set].lengths[j],
command_buffer->descriptor_sets[set].offsets[j]);
bos.push_back(arg_buffer);
run.set_arg(arg_index + j, arg_buffer);
bool not_ofm = (bindings.values[j].buffer->memory_type & IREE_HAL_MEMORY_TYPE_HOST_VISIBLE) &&
(bindings.values[j].buffer->allowed_usage & IREE_HAL_BUFFER_USAGE_MAPPING);
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IREE_HAL_BUFFER_USAGE_MAPPING is also not the correct flag:

  // WARNING: mapping can be extremely expensive, use limited hardware
  // resources, introduce data hazards, and synchronize host and device
  // execution. Unless an application knows that such issues will not arise
  // (as in tests where there's never concurrent usage) mapping should be used
  // judiciously: do not assume mapping is a high-performance technique!

https://github.com/iree-org/iree/blob/66342abbfaaee707e27ecc7d8151ad9e357ca0da/runtime/src/iree/hal/buffer.h#L389

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Please refer to this comment:
#849 (comment)

if (!not_ofm)
ofm_bo = arg_buffer;
}

run.start();
Expand All @@ -360,7 +362,7 @@ static iree_status_t iree_hal_xrt_direct_command_buffer_dispatch(
return iree_make_status(IREE_STATUS_UNKNOWN, e.what());
}

for (xrt::bo& bo : bos) bo.sync(XCL_BO_SYNC_BO_FROM_DEVICE);
ofm_bo.sync(XCL_BO_SYNC_BO_FROM_DEVICE);
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Just because today we only have one output, doesn't mean tomorrow we will only have one output.

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So far all NPU products only use one output buffer.

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This has absolutely nothing to do with NPU and everything to do with the model.

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This has absolutely nothing to do with NPU and everything to do with the model.

Do we have a model running on NPU with multiple output bo?

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This indeed doesn't have anything to do with NPU and whether we currently have a model like this or not. We shouldn't make the assumption that there is a single output buffer.


IREE_TRACE_ZONE_END(z0);
return iree_ok_status();
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