[SYCL][XPTI] Performance improvements for performance oriented toolchains #19953

tovinkere · 2025-09-02T23:20:25Z

Implementation of XPTI within SYCL combined debug and performance streams over time and this PR improves the performance by 15-20% for toolschains by separating the debug data from performance streams.

Limits the amount of debug information that is attached to the default "sycl" performance stream.
If addition metadata is needed, toolchains will have to subscribe to "sycl.debug" stream
Unified runtime created a new trace event for each function call which adds significant overhead to each call when a collector is enabled. This is now minimized by using a global event for all of UR API calls.
CUDA plugin implementation of XPTI events enabled both performance and debug streams all the time, irrespective of where there was a tool subscribing to the data.
If tools want good performance then they need to subscribe to "sycl" stream. If they want full information and performance is not as important then subscribing to "sycl.debug" stream is the right choice.

+ Improves the performance of collectors and downstream collectors by limiting the amount of metada that is attached to SYCL events + To get additional metadata, toolchains will have to also subscribe to the stream "sycl.debug" and the additional metadata will be sent in the orginal stream + Replaced all xptiMakeEvent() calls with the new xptiCreateTracepoint() function Signed-off-by: Vasanth Tovinkere <[email protected]>

Signed-off-by: Vasanth Tovinkere <[email protected]>

sycl/source/detail/global_handler.cpp

sycl/source/detail/queue_impl.cpp

unified-runtime/source/adapters/cuda/tracing.cpp

unified-runtime/source/loader/layers/tracing/ur_tracing_layer.cpp

Signed-off-by: Vasanth Tovinkere <[email protected]>

againull · 2025-09-03T21:42:26Z

These failures are unrelated:

/__w/llvm/llvm/build/test/conformance/device/device-test --gtest_filter=urDeviceGetGlobalTimestampTest.SuccessSynchronizedTime/UR_BACKEND_HIP__AMD_HIP_BACKEND__AMD_Radeon_RX_6800_XT_ID0ID_5d5f47c5a7185748____
--
/__w/llvm/llvm/unified-runtime/test/conformance/device/urDeviceGetGlobalTimestamps.cpp:93: Failure
Expected: (observedDiff) <= (allowedDiff), actual: 254563 vs 81685

/__w/llvm/llvm/unified-runtime/test/conformance/device/urDeviceGetGlobalTimestamps.cpp:93
Expected: (observedDiff) <= (allowedDiff), actual: 254563 vs 81685

#18763

CMake Error: install(EXPORT "unified-runtime-targets" ...) includes target "xptifw" which requires target "emhash" that is not in any export set.
#19944

bratpiorka

CUDA LGTM

unified-runtime/source/loader/layers/tracing/ur_tracing_layer.cpp

againull · 2025-09-09T22:55:52Z

Jenkins failure is unrelated, see #19929 (comment)

pbalcer · 2025-09-11T13:17:50Z

sycl/doc/design/SYCLInstrumentationUsingXPTI.md


+- To support performance and debug streams, subscribing to the stream **"sycl.debug"**
+  allows the default streams to contain additional metadata when keeping overheads
+  to a minimum is not important


Suggested change

to a minimum is not important

to a minimum is not important.

sycl/doc/design/SYCLInstrumentationUsingXPTI.md

unified-runtime/source/loader/layers/tracing/ur_tracing_layer.cpp

pbalcer

UR lgtm.

mmichel11

Graph changes LGTM

againull · 2025-09-16T17:11:57Z

@sergey-semenov Could you please review this PR on behalf of @intel/llvm-reviewers-runtime. @maarquitos14 and @KseniyaTikhomirova are both on vacation at the moment.

tovinkere added 3 commits September 2, 2025 15:29

[SYCL][XPTI] Updated documentation and tests

77657de

Signed-off-by: Vasanth Tovinkere <[email protected]>

Merge remote-tracking branch 'origin' into xpti_overheads

1b8337a

tovinkere requested review from a team as code owners September 2, 2025 23:20

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[SYCL][XPTI] Ensure all tests subscribe to debug stream

15a3e7b

Signed-off-by: Vasanth Tovinkere <[email protected]>

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maarquitos14 reviewed Sep 3, 2025

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[SYCL][XPTI] Addressed reviewer-1 comments

604459f

Signed-off-by: Vasanth Tovinkere <[email protected]>

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bratpiorka approved these changes Sep 4, 2025

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againull added 3 commits September 5, 2025 10:35

Merge remote-tracking branch 'origin/sycl' into xpti_overheads_local

556f03a

Fix unused variable error

ff02fce

Use kernel name is function name is not available

e6e88cb

againull had a problem deploying to WindowsCILock September 5, 2025 19:39 — with GitHub Actions Error

Avoid duplicate code

a1b2718

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againull requested a review from pbalcer September 9, 2025 15:59

againull had a problem deploying to WindowsCILock September 9, 2025 16:32 — with GitHub Actions Failure

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Merge remote-tracking branch 'origin/sycl' into wip/xpti_overheads

e0f56b0

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pbalcer reviewed Sep 11, 2025

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againull added 3 commits September 15, 2025 21:12

Merge remote-tracking branch 'origin/sycl' into wip/xpti_overheads

1faf588

Make sycl.debug a normal stream

9cf8476

Update documentation

a4de171

againull requested a review from a team as a code owner September 16, 2025 06:47

againull requested a review from mmichel11 September 16, 2025 06:47

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mmichel11 approved these changes Sep 16, 2025

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againull added 2 commits September 16, 2025 09:02

Register all callbacks for debug stream as it is a normal stream now

f4b11b8

Merge remote-tracking branch 'origin/sycl' into wip/xpti_overheads

d0ee4a5

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maarquitos14 approved these changes Sep 22, 2025

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againull merged commit 1ebd224 into intel:sycl Sep 22, 2025
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[SYCL][XPTI] Performance improvements for performance oriented toolchains #19953

[SYCL][XPTI] Performance improvements for performance oriented toolchains #19953

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tovinkere commented Sep 2, 2025 •

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