Saurabh Verma
946385d0ff
Reverts #1379 and properly migrates the docs --------- Co-authored-by: Matt Williams <matt.williams@amd.com>
94 строки
3.5 KiB
ReStructuredText
94 строки
3.5 KiB
ReStructuredText
.. meta::
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:description: A typical workflow for collecting detailed instruction-level traces
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:keywords: AQLprofile, ROCm, API, how-to, SQTT
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***********************************************
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SQ Thread Trace (SQTT) workflow with AQLprofile
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***********************************************
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The SQ Thread Trace workflow focuses on collecting detailed instruction-level traces.
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This workflow relies on creating a profile object, generating command packets, and iterating over output buffers:
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1. **Intercept the kernel dispatch**: The SDK intercepts the kernel dispatch.
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2. **Create a SQTT profile object**: A profile object is created for SQTT, specifying trace parameters and output buffers.
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3. **Generate SQTT command packets**: Start, stop, and read packets for SQTT are generated and injected into the queue.
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4. **Submit packets and run the kernel**: The kernel and SQTT packets are submitted for execution.
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5. **Collect the trace buffer**: The trace output buffer is collected after execution.
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6. **Iterate and decode trace data**: The SDK iterates over the trace buffer and decodes the SQTT data for analysis.
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The SDK abstracts queue interception and packet management so tool developers can focus on results.
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Key API code snippets
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=====================
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These API snippets use the legacy interfaces from ``hsa_ven_amd_aqlprofile.h``. These are provided for understanding purposes only.
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For new development, refer to the updated APIs in ``aql_profile_v2.h``.
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In the `ROCprofiler-SDK <https://github.com/ROCm/rocprofiler-sdk>`__ codebase, these APIs are wrapped and orchestrated in the ``aql``, ``hsa``, and ``thread_trace`` folders for queue interception, packet construction, and result iteration.
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.. note::
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The`ROCprofiler-SDK is migrating to these newer interfaces in ``aql_profile_v2.h``. You should use the APIs in ``aql_profile_v2.h`` to stay up-to-date.
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Define parameters and profile
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------------------------------
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.. code:: cpp
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hsa_ven_amd_aqlprofile_parameter_t params[] = {
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{ HSA_VEN_AMD_AQLPROFILE_PARAMETER_NAME_ATT_BUFFER_SIZE, 0x1000000} // 16 MB buffer
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};
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hsa_ven_amd_aqlprofile_profile_t profile = {
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.agent = agent,
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.type = HSA_VEN_AMD_AQLPROFILE_EVENT_TYPE_TRACE,
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.events = nullptr,
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.event_count = 0,
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.parameters = params,
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.parameter_count = sizeof(params)/sizeof(params[0]),
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.output_buffer = {trace_ptr, trace_size},
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.command_buffer = {cmd_ptr, cmd_size}
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};
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Generate SQTT start/stop packets
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---------------------------------
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.. code:: cpp
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hsa_ext_amd_aql_pm4_packet_t sqtt_start_pkt, sqtt_stop_pkt;
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hsa_ven_amd_aqlprofile_start(&profile, &sqtt_start_pkt);
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hsa_ven_amd_aqlprofile_stop(&profile, &sqtt_stop_pkt);
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Submit packets and run the kernel
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---------------------------------
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.. code:: cpp
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queue->Submit(&sqtt_start_pkt);
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queue->Submit(&kernel_pkt);
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queue->Submit(&sqtt_stop_pkt);
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Iterate and decode trace data
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-----------------------------
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.. code:: cpp
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hsa_ven_amd_aqlprofile_iterate_data(
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&profile,
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[](hsa_ven_amd_aqlprofile_info_type_t info_type,
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hsa_ven_amd_aqlprofile_info_data_t* info_data,
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void* user_data) -> hsa_status_t {
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if (info_type == HSA_VEN_AMD_AQLPROFILE_INFO_TRACE_DATA) {
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// info_data->trace_data.ptr, info_data->trace_data.size
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decode_trace(info_data->trace_data.ptr, info_data->trace_data.size);
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}
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return HSA_STATUS_SUCCESS;
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},
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nullptr
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);
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