Switch to the new tracking baseline (single iteration, CA-extended Patatrack + LST, mkFit) as Phase 2 HLT default by VourMa · Pull Request #50040 · cms-sw/cmssw

VourMa · 2026-02-05T09:28:24Z

This PR switches the default tracking sequence for Phase 2 HLT from the current baseline (two iterations, Patatrack quads + legacy triplets for seeding, CKF for building) to a new baseline (single iteration, CA-extended Patatrack + LST for seeding, mkFit for building) proposed by the TRK POG, in coordination with HLT Upgrade.

Previous behavior (configs as defined above):

No procModifiers: Current baseline.
phase2LegacyPixelTracks: Current baseline but with legacy (instead of Patatrack) quads.
phase2CAExtension,singleIterPatatrack,trackingLST,seedingLST,trackingMkFitCommon,hltTrackingMkFitInitialStep: New baseline.

Behavior adter this PR (configs as defined above):

No procModifiers: New baseline.
hltPhase2LegacyTracking: Current baseline but with legacy (instead of Patatrack) quads.
hltPhase2LegacyTrackingPatatrackQuads: Current baseline.

By switching to the new baseline, a significant simplification of the tracking modules has been performed by removing all intermediate tracking configurations. Apart from the configurations discussed above, only the following configurations remain for Phase 2 HLT:

trackingLST: single iteration, CA-extended Patatrack, LST for building.
trackingMkFitFit: single iteration, CA-extended Patatrack + LST for seeding, mkFit for building, mkFit (instead of CKF) fitting.

As a result of the above, the workflows of intermediate configurations have been removed. Together with that, the updates of #49755 (and this PR is superseded by this one) have been included here, to avoid conflicts.

The NGT scouting configurations have been touched as apart of the aforementioned simplifications but all of the previous configurations are still supported.

The PR has been validated by running all the supported configuration and making sure that they produce exactly the same results as before the changes, i.e. this PR is purely technical for those configurations:

Current baseline (click me for validation plot)

Current baseline but with legacy (instead of Patatrack) quads (click me for validation plot)

New baseline (click me for validation plot)

`trackingLST` (click me for validation plot)

`trackingMkFitFit` (click me for validation plot)

`ngtScouting` (click me for validation plot)

`ngtScouting,trackingLST` (click me for validation plot)

FYI @rovere

cmsbuild · 2026-02-05T09:28:55Z

cms-bot internal usage

cmsbuild · 2026-02-05T09:29:55Z

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50040/47892

There are other open Pull requests which might conflict with changes you have proposed:
- File Configuration/PyReleaseValidation/README.md modified in PR(s): Remove alpaka procModfier from workflows in which it is no longer useful #49755, TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932, Updates to the offline CPU vs. GPU workflows for LST #49984
- File Configuration/PyReleaseValidation/python/relval_Run4.py modified in PR(s): Remove alpaka procModfier from workflows in which it is no longer useful #49755, TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932, Updates to the offline CPU vs. GPU workflows for LST #49984
- File Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py modified in PR(s): Remove alpaka procModfier from workflows in which it is no longer useful #49755, update phase-2 HLT timing script and use alpaka modifier in NGT workflows #49821, TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932, Updates to the offline CPU vs. GPU workflows for LST #49984
- File Configuration/PyReleaseValidation/scripts/runTheMatrix.py modified in PR(s): [Do not merge] For cms-bot PR testing #48637, Remove alpaka procModfier from workflows in which it is no longer useful #49755, TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932
- File HLTrigger/Configuration/python/HLT_75e33/modules/hltPhase2PixelTracksSoA_cfi.py modified in PR(s): [NGT] Extension of CA Pixel Tracking to Phase-2 Outer Tracker Disks (TID) #49346
- File HLTrigger/Configuration/python/HLT_75e33/test/runHLTTiming.sh modified in PR(s): update phase-2 HLT timing script and use alpaka modifier in NGT workflows #49821
- File Validation/RecoTrack/python/customiseTrackingNtuple.py modified in PR(s): Fix: remove dependencies of trackingNutple sequence for phase-2 HLT #49857

cmsbuild · 2026-02-05T09:30:22Z

A new Pull Request was created by @VourMa for master.

It involves the following packages:

Configuration/ProcessModifiers (operations)
Configuration/PyReleaseValidation (pdmv)
HLTrigger/Configuration (hlt)
HLTrigger/NGTScouting (hlt)
Validation/RecoTrack (dqm)
Validation/SiTrackerPhase2V (dqm)

@AdrianoDee, @DickyChant, @Martin-Grunewald, @antoniovagnerini, @cmsbuild, @ctarricone, @davidlange6, @fabiocos, @ftenchini, @gabrielmscampos, @mandrenguyen, @miquork, @mmusich, @nothingface0, @rseidita can you please review it and eventually sign? Thanks.
@GiacomoSguazzoni, @Martin-Grunewald, @SohamBhattacharya, @VinInn, @VourMa, @arossi83, @dgulhan, @elusian, @fabiocos, @felicepantaleo, @makortel, @missirol, @mmasciov, @mmusich, @mtosi, @richa2710, @rovere, @slomeo, @sroychow, @wmtford this is something you requested to watch as well.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.

cms-bot commands are listed here

mmusich · 2026-02-05T09:36:44Z

test parameters:

enable = hlt_p2_integration, hlt_p2_timing
workflows = ph2_hlt

mmusich · 2026-02-05T09:36:50Z

@cmsbuild, please test

VourMa · 2026-02-05T09:51:03Z

 )

-from Configuration.ProcessModifiers.phase2CAExtension_cff import phase2CAExtension


Previously, extended pixel tracks without the corresponding ID were used here, even though these are not used anywhere in the downstream code, except for pixel vertexing, for reasons that are not explained with a comment in the relevant module. This was in disagreement with the rest of the configurations, which were using here the pixel tracks that are used by downstream modules.

With the deletion of these lines in this PR, extended with the corresponding ID are used here, i.e. the one that are used by downstream code. This behavior is to me the "natural" one, in agreement with the rest of the configuration. However, if there is a strong preference that this is kept as different from the rest of the configurations, I will adjust accordingly.

Tagging @elenavernazza and @mmusich as the original authors of this code. FYI @rovere.

This also affects a couple of replacements in the following lines.

@VourMa, we are using e.g. the non-high purity pixel tracks to make track quality selection studies (Cc: @EmanueleCoradin). We would appreciate if you could keep sending those to nanoAOD until these studies are done. After we have a robust selection strategy for pixel tracks we can go back sending the HP collection.

Thanks for asking!

do I understand correctly that *pixelTrack* tables are not used in the default NANO (I was looking at an expanded config in 29834.772)? In this sense these are a POG/DPG NANO flavor. Is there a workflow that enables these?

Is there a workflow that enables these?

yes, actually multiple.

0.759: HLT phase-2 timing menu, with NANO:@Phase2HLT 0.772: HLT phase-2 NGT Scouting menu, with NANO:@NGTScouting 0.773: HLT phase-2 NGT Scouting menu, with NANO:@NGTScoutingVal

the are all included in the ph2_hlt matrix tested here:

cmssw/Configuration/PyReleaseValidation/scripts/runTheMatrix.py

Lines 178 to 182 in 19dbf0b

prefixDet+34.759, # HLT phase-2 timing menu, with NANO:@Phase2HLT

prefixDet+34.77, # HLT phase-2 NGT Scouting menu

prefixDet+34.771, # HLT phase-2 NGT Scouting menu, Alpaka, TICL-v5, TICL-Barrel, CA Extension

prefixDet+34.772, # HLT phase-2 NGT Scouting menu, with NANO:@NGTScouting

prefixDet+34.773, # HLT phase-2 NGT Scouting menu, with NANO:@NGTScoutingVal

ehm, I was looking at 772 and it is not using the pixelTrack table.
nanoAOD_step = cms.Path(dstNanoFlavour) doesn't have it.

There are sequences containing NanoPixelTables but are all unused

hltPixelOnlyNanoFlavour

dstValidationNanoFlavour

hltValidationNanoFlavour

this is CMSSW_16_1_0_pre1
Did I miss something?

try looking in .773 if you are referring specifically to the pixel tables. I thought you referred in general to the HLT nanoAOD-s not being in workflows.

cmsbuild · 2026-02-05T11:05:12Z

-1

Failed Tests: HLTP2Integration HLTP2Timing RelVals
Size: This PR adds an extra 112KB to repository
Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4bd0a4/51120/summary.html
COMMIT: 1cb2ecc
CMSSW: CMSSW_16_1_X_2026-02-04-2300/el8_amd64_gcc13
Additional Tests: HLT_P2_INTEGRATION,HLT_P2_TIMING
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmssw/50040/51120/install.sh to create a dev area with all the needed externals and cmssw changes.

Failed RelVals

34434.756

----- Begin Fatal Exception 05-Feb-2026 11:43:09 CET-----------------------
An exception of category 'ProductNotFound' occurred while
   [0] Processing  Event run: 1 lumi: 1 event: 1 stream: 0
   [1] Running path 'HLT_PFPuppiMETTypeOne140_PFPuppiMHT140'
   [2] Calling method for module CAHitNtupletAlpakaPhase2OT@alpaka/'hltPhase2PixelTracksSoA'
Exception Message:
Principal::getByToken: Found zero products matching all criteria
Looking for type: reco::TrackingRecHitHost
Looking for module label: hltPhase2PixelRecHitsExtendedSoA
Looking for productInstanceName: 

   Additional Info:
      [a] If you wish to continue processing events after a ProductNotFound exception,
add "TryToContinue = cms.untracked.vstring('ProductNotFound')" to the "options" PSet in the configuration.

----- End Fatal Exception -------------------------------------------------

cmsbuild · 2026-02-05T18:21:07Z

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-50040/47906

There are other open Pull requests which might conflict with changes you have proposed:
- File Configuration/PyReleaseValidation/README.md modified in PR(s): TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932, Updates to the offline CPU vs. GPU workflows for LST #49984
- File Configuration/PyReleaseValidation/python/relval_Run4.py modified in PR(s): TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932, Updates to the offline CPU vs. GPU workflows for LST #49984
- File Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py modified in PR(s): update phase-2 HLT timing script and use alpaka modifier in NGT workflows #49821, TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932, Updates to the offline CPU vs. GPU workflows for LST #49984
- File Configuration/PyReleaseValidation/scripts/runTheMatrix.py modified in PR(s): [Do not merge] For cms-bot PR testing #48637, TICL: Consolidate v5 as Default Configuration and Cleanup Legacy Code #49932
- File HLTrigger/Configuration/python/HLT_75e33/modules/hltPhase2PixelTracksSoA_cfi.py modified in PR(s): [NGT] Extension of CA Pixel Tracking to Phase-2 Outer Tracker Disks (TID) #49346
- File HLTrigger/Configuration/python/HLT_75e33/test/runHLTTiming.sh modified in PR(s): update phase-2 HLT timing script and use alpaka modifier in NGT workflows #49821
- File Validation/RecoTrack/python/customiseTrackingNtuple.py modified in PR(s): Fix: remove dependencies of trackingNutple sequence for phase-2 HLT #49857

mmusich · 2026-03-02T13:23:07Z

I found 14 workflow step(s) with memory usage exceeding the error threshold

Would it be possible to identify which is the source of the memory usage increase on CPU?

VourMa · 2026-03-02T13:32:33Z

I found 14 workflow step(s) with memory usage exceeding the error threshold

Would it be possible to identify which is the source of the memory usage increase on CPU?

I have made a report previously on this point:
#50040 (comment)

All in all, the new memory for the default baseline is consistent with the memory of the (now deleted, as it became the new baseline) 0.7571workflow (HLT75e33TimingAlpakaSingleIterLSTSeedingMkFitBuilding).

mmusich · 2026-03-02T13:34:02Z

I have made a report previously on this point:

is it possible instead to do a direct measurement of the workflow memory (and possibly profiling) instead of trying to infer from the bot results?

VourMa · 2026-03-02T13:48:51Z

is it possible instead to do a direct measurement of the workflow memory (and possibly profiling) instead of trying to infer from the bot results?

These bot measurements are pretty consistent across PRs (e.g. similar results can be inferred from the tests in #50283). What is the reason to mistrust them?

slava77 · 2026-03-02T15:41:06Z

is this CPU memory a blocking issue? Perhaps it's practical to make a github issue for a follow up.

mmusich · 2026-03-02T16:55:54Z

is this CPU memory a blocking issue? Perhaps it's practical to make a github issue for a follow up.

yes, let's follow-up in an issue. I created #50288

mmusich · 2026-03-02T17:00:57Z

+hlt

for SegmentLinking@247705b
PR according to description and follow-up review.
HLT Phase-2 timing test has been adapted in Update Phase 2 timing configuration #50278 to use a single socket together with two NVIDIA T4 GPUs in order to simulate a possible Run 4 node with a 50/50 split in CPU/GPU compute. With that configuration the timing on both CPU and GPU backends is sensibly reduced (see detailed analysis at Switch to the new tracking baseline (single iteration, CA-extended Patatrack + LST, mkFit) as Phase 2 HLT default #50040 (comment)).
The cost in terms of GPU memory consumption has been mitigated at Memory Improvements for LST #50157, see Memory Improvements for LST #50157 (comment) for an estimate.
The cost in terms of CPU memory consumption is yet not fully clear, but it will be followed upon in Understand increase of CPU memory usage in phase-2 HLT workflows after adoption of new Tracking Baseline #50288
The physics performance has also been thoroughly and carefully validated by the TRK POG, so any residual concerns in that direction can likely be considered already addressed.

rovere · 2026-03-02T17:12:36Z

is this CPU memory a blocking issue? Perhaps it's practical to make a github issue for a follow up.

In general nothing is a blocking issue. On the other hand, one of the outcome of this "strict" review is a considerable reduction of memory in the new tracking baseline from LST. While I agree we should try to have new developments integrated as soon as possible, we do also have to keep a constant eye on resource usage and act accordingly to reduce them, when and where feasible.

mmasciov · 2026-03-02T17:24:29Z

The physics performance has also been thoroughly and carefully validated by the TRK POG, so any residual concerns in that direction can likely be considered already addressed.

While the physics performance was thoroughly reviewed within the TRK POG (@cms-sw/tracking-pog-l2) (as well as within TSG/HLT upgrade), and that the TRK POG supports this PR, let me highlight for historical precision that there are improvements foreseen on top of the current PR, physics-wise; e.g., see presentations at TRK POG last week (Feb 23), or today (Mar 2).
It was agreed that these improvements shall build on top of this PR, as independent PRs that will be submitted as soon as ready.

slava77 · 2026-03-02T18:24:48Z

For the record, here are the changes in timing due to the PR:

are the circles links available for the timing/job reports?

mmusich · 2026-03-02T18:26:01Z

are the circles links available for the timing/job reports?

they are, follow the link at:

HLT P2 Timing: chart

VourMa · 2026-03-03T13:39:32Z

@cms-sw/dqm-l2 We have converged on this, could you take a look and let me know whether it looks OK from your side?

AdrianoDee · 2026-03-03T14:38:24Z

+pdmv
(wf wise, all good)

gabrielmscampos · 2026-03-03T15:49:47Z

+dqm

cmsbuild · 2026-03-03T15:50:14Z

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @mandrenguyen, @ftenchini (and backports should be raised in the release meeting by the corresponding L2)

mandrenguyen · 2026-03-03T19:41:07Z

+1

mmusich · 2026-03-05T18:31:01Z

For the record, in the IB CMSSW_16_1_X_2026-03-03-2300 after this PR was merged we started observing an higher than usual rate of failed workflows in the GPU matrix on the machines with GPUs, from about 1 per IB to about 20-30 per IBs:

The failures is more often than not a segmentation violation in the step2 in the HLT, example log file with the stack trace containing:

Thread 28 (Thread 0x14a8fb400700 (LWP 3630546) "cmsRun"):
#0  0x000014ab80732ae1 in poll () from /lib64/libc.so.6
#1  0x000014ab7924bace in edm::service::InitRootHandlers::stacktraceFromThread() () from /cvmfs/cms-ib.cern.ch/sw/x86_64/nweek-02931/el8_amd64_gcc13/cms/cmssw/CMSSW_16_1_X_2026-03-02-2300/lib/el8_amd64_gcc13/pluginFWCoreServicesPlugins.so
#2  0x000014ab7924bcd3 in sig_dostack_then_abort () from /cvmfs/cms-ib.cern.ch/sw/x86_64/nweek-02931/el8_amd64_gcc13/cms/cmssw/CMSSW_16_1_X_2026-03-02-2300/lib/el8_amd64_gcc13/pluginFWCoreServicesPlugins.so
#3  <signal handler called>
#4  0x000014ab806df37a in __memset_avx512_unaligned_erms () from /lib64/libc.so.6
#5  0x000014a8f5977ca1 in std::_Function_handler<std::any (edm::StreamID, edm::WrapperBase const&, edm::WaitingTaskWithArenaHolder), edm::stream::impl::Transformer::registerTransformAsync<reco::TrackingRecHitHost, alpaka_cuda_async::ProducerBase<edm::stream::EDProducer>::produces<reco::TrackingRecHitHost, (edm::Transition)0>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)::{lambda(edm::StreamID, reco::TrackingRecHitHost const&, edm::WaitingTaskWithArenaHolder)#1}, alpaka_cuda_async::ProducerBase<edm::stream::EDProducer>::produces<reco::TrackingRecHitHost, (edm::Transition)0>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)::{lambda(edm::StreamID, auto:1)#1}>(edm::EDPutTokenT<reco::TrackingRecHitHost>, alpaka_cuda_async::ProducerBase<edm::stream::EDProducer>::produces<reco::TrackingRecHitHost, (edm::Transition)0>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)::{lambda(edm::StreamID, reco::TrackingRecHitHost const&, edm::WaitingTaskWithArenaHolder)#1}, alpaka_cuda_async::ProducerBase<edm::stream::EDProducer>::produces<reco::TrackingRecHitHost, (edm::Transition)0>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)::{lambda(edm::StreamID, auto:1)#1}, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)::{lambda(edm::StreamID, edm::WrapperBase const&, edm::WaitingTaskWithArenaHolder)#1}>::_M_invoke(std::_Any_data const&, edm::StreamID&&, edm::WrapperBase const&, edm::WaitingTaskWithArenaHolder&&) () from /cvmfs/cms-ib.cern.ch/sw/x86_64/nweek-02931/el8_amd64_gcc13/cms/cmssw-patch/CMSSW_16_1_X_2026-03-03-2300/lib/el8_amd64_gcc13/pluginRecoLocalTrackerPhase2OTRecHitsSoAPluginsPortableCudaAsync.so

@JanGerritSchulz diagnosed and fixed this issue at #50318 (there might be other failures downstream).

cmsbuild added this to the CMSSW_16_1_X milestone Feb 5, 2026

cmsbuild added dqm-pending hlt-pending operations-pending pending-signatures tests-pending orp-pending pdmv-pending code-checks-pending tracking trk labels Feb 5, 2026

cmsbuild added code-checks-approved and removed code-checks-pending labels Feb 5, 2026

VourMa mentioned this pull request Feb 5, 2026

Remove alpaka procModfier from workflows in which it is no longer useful #49755

Closed

cmsbuild added tests-started and removed tests-pending labels Feb 5, 2026

VourMa commented Feb 5, 2026

View reviewed changes

cmsbuild added tests-rejected tests-pending code-checks-pending and removed tests-started tests-rejected code-checks-approved labels Feb 5, 2026

mmusich mentioned this pull request Mar 2, 2026

Understand increase of CPU memory usage in phase-2 HLT workflows after adoption of new Tracking Baseline #50288

Open

This was referenced Mar 2, 2026

update phase-2 HLT timing script and use alpaka modifier in NGT workflows #49821

Open

Particle Flow cluster validation in ECAL #50292

Open

Spring Cleaning of unused global PSets in Phase-2 HLT menus #50293

Merged

This was referenced Mar 5, 2026

[EVO] Moved muon digis to versioned namespace #50305

Merged

[EVO] Moved CTPPSDigi data products to versioned namespace #50308

Merged

		)

		from Configuration.ProcessModifiers.phase2CAExtension_cff import phase2CAExtension

	prefixDet+34.759, # HLT phase-2 timing menu, with NANO:@Phase2HLT
	prefixDet+34.77, # HLT phase-2 NGT Scouting menu
	prefixDet+34.771, # HLT phase-2 NGT Scouting menu, Alpaka, TICL-v5, TICL-Barrel, CA Extension
	prefixDet+34.772, # HLT phase-2 NGT Scouting menu, with NANO:@NGTScouting
	prefixDet+34.773, # HLT phase-2 NGT Scouting menu, with NANO:@NGTScoutingVal

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Failed RelVals

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