upgrade EvtGen interface for v03.00.00 by kawaho · Pull Request #51029 · cms-sw/cmssw

kawaho · 2026-05-25T15:59:56Z

PR description:

Resolves #50935

This commits upgrade EvtGen interface to v03.00.00 in CMSSW, which

is now thread-safe, allowing multithreading in production
adds new final state photon radiation models in Sherpa/Photon++ and Vincia
includes new physics models and decay table implemented by Belle 2

This commit depends on a new cmssw external build cms-sw/cmsdist#10580

PR validation:

Tested by producing a small TTTo2L2Nu Pythia+EvtGen sample locally with multiple threads, using a similar the same fragment as 1 but with PythiaConcurrentHadronizerFilter.

One remaining issue is that the EvtGen interface now calls ThreadHandoff implemented for GEANT4 to ensure a stream started in a certain thread stays in the same thread. Shall we move ThreadHandoff under FWCore/Concurrency instead, so packages with similar concurrency implementation (one instance per thread/use of thread_local) can use the same module? @makortel @Dr15Jones, please advise.

cmsbuild · 2026-05-25T16:00:24Z

cms-bot internal usage

cmsbuild · 2026-05-25T16:02:07Z

-code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/49473

ERROR: Build errors found during clang-tidy run.

src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:37:38: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   37 |   unsigned long int lastSeed() const override;
      |                                      ^~~~~~~~
Suppressed 441 warnings (441 in non-user code).
--
src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:35:40: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   35 |   void setSeed(unsigned long int seed) override;
      |                                        ^~~~~~~~
src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:37:38: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   37 |   unsigned long int lastSeed() const override;
      |                                      ^~~~~~~~
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:338:29: error: no member named 'getSherpaPhotonsModel' in 'EvtExternalGenList' [clang-diagnostic-error]
  338 |     radCorrEngine = genList.getSherpaPhotonsModel(1e-7, 1, 0);
      |                     ~~~~~~~ ^
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:340:29: error: no member named 'getVinciaQEDModel' in 'EvtExternalGenList' [clang-diagnostic-error]
  340 |     radCorrEngine = genList.getVinciaQEDModel(1.0e-7);
      |                     ~~~~~~~ ^
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:534:24: error: non-const lvalue reference to type 'EvtDecayTable' cannot bind to a temporary of type 'EvtDecayTable *' [clang-diagnostic-error]
  534 |         EvtDecayTable& evtDecayTable = EvtDecayTable::getInstance();
      |                        ^               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 1178 warnings (1174 in non-user code, 4 NOLINT).
--
gmake: *** [config/SCRAM/GMake/Makefile.coderules:129: code-checks] Error 2
gmake: *** [There are compilation/build errors. Please see the detail log above.] Error 2

makortel · 2026-05-26T17:35:40Z

 <use name="FWCore/Concurrency"/>
 <use name="FWCore/ParameterSet"/>
 <use name="FWCore/Framework"/>
+<use name="SimG4Core/Application"/>


(as I commented already in the earlier issue) I think this dependence on SimG4Core should be avoided. I opened #51041 to move the ThreadHandoff to FWCore/Utilities.

thanks, merged

cmsbuild · 2026-05-26T18:27:05Z

-code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/49482

ERROR: Build errors found during clang-tidy run.

src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:37:38: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   37 |   unsigned long int lastSeed() const override;
      |                                      ^~~~~~~~
Suppressed 441 warnings (441 in non-user code).
--
src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:35:40: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   35 |   void setSeed(unsigned long int seed) override;
      |                                        ^~~~~~~~
src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:37:38: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   37 |   unsigned long int lastSeed() const override;
      |                                      ^~~~~~~~
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:338:29: error: no member named 'getSherpaPhotonsModel' in 'EvtExternalGenList' [clang-diagnostic-error]
  338 |     radCorrEngine = genList.getSherpaPhotonsModel(1e-7, 1, 0);
      |                     ~~~~~~~ ^
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:340:29: error: no member named 'getVinciaQEDModel' in 'EvtExternalGenList' [clang-diagnostic-error]
  340 |     radCorrEngine = genList.getVinciaQEDModel(1.0e-7);
      |                     ~~~~~~~ ^
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:534:24: error: non-const lvalue reference to type 'EvtDecayTable' cannot bind to a temporary of type 'EvtDecayTable *' [clang-diagnostic-error]
  534 |         EvtDecayTable& evtDecayTable = EvtDecayTable::getInstance();
      |                        ^               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 1178 warnings (1174 in non-user code, 4 NOLINT).
--
gmake: *** [config/SCRAM/GMake/Makefile.coderules:129: code-checks] Error 2
gmake: *** [There are compilation/build errors. Please see the detail log above.] Error 2

cmsbuild · 2026-05-26T18:31:18Z

-code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/49483

ERROR: Build errors found during clang-tidy run.

src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:37:38: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   37 |   unsigned long int lastSeed() const override;
      |                                      ^~~~~~~~
Suppressed 441 warnings (441 in non-user code).
--
src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:35:40: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   35 |   void setSeed(unsigned long int seed) override;
      |                                        ^~~~~~~~
src/GeneratorInterface/EvtGenInterface/interface/myEvtRandomEngine.h:37:38: error: only virtual member functions can be marked 'override' [clang-diagnostic-error]
   37 |   unsigned long int lastSeed() const override;
      |                                      ^~~~~~~~
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:338:29: error: no member named 'getSherpaPhotonsModel' in 'EvtExternalGenList' [clang-diagnostic-error]
  338 |     radCorrEngine = genList.getSherpaPhotonsModel(1e-7, 1, 0);
      |                     ~~~~~~~ ^
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:340:29: error: no member named 'getVinciaQEDModel' in 'EvtExternalGenList' [clang-diagnostic-error]
  340 |     radCorrEngine = genList.getVinciaQEDModel(1.0e-7);
      |                     ~~~~~~~ ^
src/GeneratorInterface/EvtGenInterface/plugins/EvtGen/EvtGenInterface.cc:534:24: error: non-const lvalue reference to type 'EvtDecayTable' cannot bind to a temporary of type 'EvtDecayTable *' [clang-diagnostic-error]
  534 |         EvtDecayTable& evtDecayTable = EvtDecayTable::getInstance();
      |                        ^               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppressed 1178 warnings (1174 in non-user code, 4 NOLINT).
--
gmake: *** [config/SCRAM/GMake/Makefile.coderules:129: code-checks] Error 2
gmake: *** [There are compilation/build errors. Please see the detail log above.] Error 2

cmsbuild · 2026-06-15T11:16:43Z

-code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/49768

Found files with invalid states:
- GeneratorInterface/Pythia8Interface/interface/Pythia8EvtGenPatched.h:
  - Added: 5d91b5b
  - Modified: 8a34914
  - Deleted: a6dfc85

Code check has found code style and quality issues which could be resolved by applying following patch(s)

code-format:
https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/49768/code-format.patch
e.g. curl -k https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/49768/code-format.patch | patch -p1
You can also run scram build code-format to apply code format directly

lviliani · 2026-06-19T12:53:13Z

Hi @kawaho, I was wondering if this new interface would be still compatible with older EvtGen versions. I think we should not completely switch to the new version until it's fully validated, so back-compatibility is important.

If it's not, maybe we should consider having two different interfaces, such as EvtGenInterface and EvtGen3Interface as we did for HepMC.

kawaho · 2026-06-22T18:25:03Z

Hi @lviliani , indeed, this interface will not be compatible with older EvtGen versions. In principle, I can move things to EvtGen3Interface but the issue is the new EvtGen also requires a patch to the existing Pythia8 in cmssw (See cms-sw/cmsdist#10580). It might not be feasible to maintain both EvtGen v2 and EvtGen v3. Let me know what you think.

lviliani · 2026-06-23T08:38:43Z

Hi @lviliani , indeed, this interface will not be compatible with older EvtGen versions. In principle, I can move things to EvtGen3Interface but the issue is the new EvtGen also requires a patch to the existing Pythia8 in cmssw (See cms-sw/cmsdist#10580). It might not be feasible to maintain both EvtGen v2 and EvtGen v3. Let me know what you think.

Right, then we have to discuss how to move forward if we can't have both versions in the same release. EvtGen 3 should be carefully validated before it's used in production.

One possibility is to follow the same approach that was recently used for the Pythia8 update, which is including EvtGen 3 in the next CMSSW_17_0_X pre-release (I think it's going to be pre3) and validate it before CMSSW_17_0_0 is ready, which should happen in November 2026 according to the schedule. If we don't manage to do the validation, we revert back to EvtGen 2.

Tagging also @mandrenguyen and @ftenchini to hear their opinion, given that we discussed a similar approach for pythia.

kawaho · 2026-06-24T16:44:53Z

Hi @lviliani , indeed, this interface will not be compatible with older EvtGen versions. In principle, I can move things to EvtGen3Interface but the issue is the new EvtGen also requires a patch to the existing Pythia8 in cmssw (See cms-sw/cmsdist#10580). It might not be feasible to maintain both EvtGen v2 and EvtGen v3. Let me know what you think.

Right, then we have to discuss how to move forward if we can't have both versions in the same release. EvtGen 3 should be carefully validated before it's used in production.

One possibility is to follow the same approach that was recently used for the Pythia8 update, which is including EvtGen 3 in the next CMSSW_17_0_X pre-release (I think it's going to be pre3) and validate it before CMSSW_17_0_0 is ready, which should happen in November 2026 according to the schedule. If we don't manage to do the validation, we revert back to EvtGen 2.

Tagging also @mandrenguyen and @ftenchini to hear their opinion, given that we discussed a similar approach for pythia.

Hi @lviliani , is there a standard checklist of things I need to do for the validation? I imagine on the physics side, we should check the differences between v2 and v3 to be expected in maybe a selected list of Rivet routines. Are there other checks needed in addition? I would like to understand the amount of work needed and to allocate my time accordingly. Thanks!

lviliani · 2026-06-26T11:50:15Z

Hi @lviliani , indeed, this interface will not be compatible with older EvtGen versions. In principle, I can move things to EvtGen3Interface but the issue is the new EvtGen also requires a patch to the existing Pythia8 in cmssw (See cms-sw/cmsdist#10580). It might not be feasible to maintain both EvtGen v2 and EvtGen v3. Let me know what you think.

Right, then we have to discuss how to move forward if we can't have both versions in the same release. EvtGen 3 should be carefully validated before it's used in production.
One possibility is to follow the same approach that was recently used for the Pythia8 update, which is including EvtGen 3 in the next CMSSW_17_0_X pre-release (I think it's going to be pre3) and validate it before CMSSW_17_0_0 is ready, which should happen in November 2026 according to the schedule. If we don't manage to do the validation, we revert back to EvtGen 2.
Tagging also @mandrenguyen and @ftenchini to hear their opinion, given that we discussed a similar approach for pythia.

Hi @lviliani , is there a standard checklist of things I need to do for the validation? I imagine on the physics side, we should check the differences between v2 and v3 to be expected in maybe a selected list of Rivet routines. Are there other checks needed in addition? I would like to understand the amount of work needed and to allocate my time accordingly. Thanks!

Hi @kawaho, in addition to the physics validation that you mentioned, we should make sure that workflows with EvtGen v3 can run successfully in central production up to NanoAOD.
And regarding the physics validation, I would recommend to get in touch with BPH, as they are the main customers of EvtGen in CMS.

kawaho · 2026-06-26T14:19:40Z

Hi @lviliani , indeed, this interface will not be compatible with older EvtGen versions. In principle, I can move things to EvtGen3Interface but the issue is the new EvtGen also requires a patch to the existing Pythia8 in cmssw (See cms-sw/cmsdist#10580). It might not be feasible to maintain both EvtGen v2 and EvtGen v3. Let me know what you think.

Right, then we have to discuss how to move forward if we can't have both versions in the same release. EvtGen 3 should be carefully validated before it's used in production.
One possibility is to follow the same approach that was recently used for the Pythia8 update, which is including EvtGen 3 in the next CMSSW_17_0_X pre-release (I think it's going to be pre3) and validate it before CMSSW_17_0_0 is ready, which should happen in November 2026 according to the schedule. If we don't manage to do the validation, we revert back to EvtGen 2.
Tagging also @mandrenguyen and @ftenchini to hear their opinion, given that we discussed a similar approach for pythia.

Hi @lviliani , is there a standard checklist of things I need to do for the validation? I imagine on the physics side, we should check the differences between v2 and v3 to be expected in maybe a selected list of Rivet routines. Are there other checks needed in addition? I would like to understand the amount of work needed and to allocate my time accordingly. Thanks!

Hi @kawaho, in addition to the physics validation that you mentioned, we should make sure that workflows with EvtGen v3 can run successfully in central production up to NanoAOD. And regarding the physics validation, I would recommend to get in touch with BPH, as they are the main customers of EvtGen in CMS.

I have started a thread on cms-talk: https://cms-talk.web.cern.ch/t/upgrading-evtgen-in-central-production/146386

Kiarendil · 2026-06-26T14:34:37Z

Hi

First, I am not sure I understand the current plan for the EvtGen 3 usage in terms of CMSSW releases and MC production campaigns. Are we going to do some backports to older versions, such as 15_0_X at least ? If not, which can be MC conditions and campaigns which target CMSSW_17? I mean, which GT, which Mini / Nano versions, etc?
Only some abstract Run-3 Ultra-Legacy, which is very unknown when and how to happen?

What about CMSSW_20 for Phase-2?

Regarding the physics validation from BPH POV – how can one test some private production with this EvtGen 3? If the way is to pull this PR to a custom CMSSW under lxplus etc, then again – which cmsDriver should be used ?

Dr15Jones · 2026-06-26T14:39:44Z

If useful, it is possible to request a special integration build that contains EvtGen 3 plus all necessary CMSSW changes.

kawaho · 2026-06-26T14:43:18Z

Hi @Dr15Jones I think that would be useful!

Kiarendil · 2026-06-26T14:46:14Z

If useful, it is possible to request a special integration build that contains EvtGen 3 plus all necessary CMSSW changes.

This is indeed a way, which I understand; though my question is more PPD-related about the matching of EvtGen 3 with some production campaign.

Well, I agree these questions can be separated , and one can do some more abstract tests / comparison of EvtGen 2 vs 3 performance under this IB release with cmsDriver for e.g. Summer 24 campaign.
But then the question of how to really use EvtGen 3 in production stands valid, and I think it is important to answer as well before doing IBs, as this determines CMSSW releases and back ports.
Sorry if I understand smth wrong.

lviliani · 2026-06-26T14:47:55Z

@Kiarendil first we need to validate it, then we can discuss if we want to use it already in production or not, and in that case in which release.

@Dr15Jones we discussed that also for Pythia but then decided to not have a special build. But in this case, being a major upgrade, it might be useful indeed.

Dr15Jones · 2026-06-26T14:50:16Z

@smuzaffar would be the one to ask to get an EvtGen3 IB. I'd suggest doing it in CMSSW_20_1.

smuzaffar · 2026-07-01T11:23:41Z

@lviliani , we can setup a dedicated IB for EvtGen3 if that helps with the integration/testing.
For externals, its is easy to setup a dedicated branch. For cmssw, is it possible to get EvtGen3 related changes in master branch with some configuration flag and/or ifdef to selected old evtgen and new evtgen3 ? Otherwise we have to maintain a separate cmssw branch for EvtGen3 and deal with merge conflicts ( which for cmssw happens alot).

Dr15Jones · 2026-07-01T13:23:53Z

maintain a separate cmssw branch for EvtGen3 and deal with merge conflicts ( which for cmssw happens alot).

But the merge conflicts would probably only happen if code in master was touching EvtGen related items, which seems unlikely.

smuzaffar · 2026-07-01T13:30:58Z

maintain a separate cmssw branch for EvtGen3 and deal with merge conflicts ( which for cmssw happens alot).

But the merge conflicts would probably only happen if code in master was touching EvtGen related items, which seems unlikely.

yes that is true

smuzaffar · 2026-07-01T14:06:39Z

code-checks with cms.week0.PR_7633f646/100.0-1bcf27b469f48c8773c80cbe8786c1d1

cmsbuild · 2026-07-01T14:14:13Z

-code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/50049

Found files with invalid states:
- GeneratorInterface/Pythia8Interface/interface/Pythia8EvtGenPatched.h:
  - Added: 5d91b5b
  - Modified: 8a34914
  - Deleted: a6dfc85

Code check has found code style and quality issues which could be resolved by applying following patch(s)

code-format:
https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/50049/code-format.patch
e.g. curl -k https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-51029/50049/code-format.patch | patch -p1
You can also run scram build code-format to apply code format directly

kawaho · 2026-07-09T14:36:48Z

Hi @smuzaffar , are there any updates on the special build for EvtGen? Do I need to do anything on my end? Thank you.

smuzaffar · 2026-07-14T10:32:04Z

@kawaho , this should also go in 20.1.X release cycles ... right? If yes then I suggest that we first setup CMSSW_20_1_EVTGEN3_X IBs and test these changes there

kawaho · 2026-07-14T14:43:45Z

@kawaho , this should also go in 20.1.X release cycles ... right? If yes then I suggest that we first setup CMSSW_20_1_EVTGEN3_X IBs and test these changes there

Hi @smuzaffar is there a guide on how to port these changes to another release? I have an old 17_0_X IB locally that does not exist anymore. Do I setup a newer 17_0_X IB locally or what should I do?

Kiarendil · 2026-07-14T14:49:20Z

Could anyone please suggest, If it would be straightforward to produce and validate the private MC in CMSSW_20_X ? Will all cmsDriver steps which work in current CMSSW, be working there ? E.g. SIM step, HLT step etc? My naive feeling that maybe 17_0_X build could be easier to produce private MC and play with it.

smuzaffar · 2026-07-14T15:24:50Z

@kawaho , I have setup a CMSSW_20_1_EVTGEN3_X IB and I will include cms-sw/cmsdist#10580 for that IB. Once evtgent3 external is available in the CMSSW_20_1_EVTGEN3_X then you can just use that IB to do the local tests

Ka Wa Ho added 5 commits May 15, 2026 16:46

minimal changes to make it compile

5d91b5b

move to thread_local

8a34914

Apply ThreadHandoff to ConcurrentExternalDecayDriver

72ed0d7

move pythia patch to cmsdist

a6dfc85

bump to EvtGen v3.0.0; enable fsr options

4dcf499

cmsbuild added this to the CMSSW_17_0_X milestone May 25, 2026

cmsbuild added generators-pending pending-signatures tests-pending orp-pending code-checks-pending labels May 25, 2026

kawaho mentioned this pull request May 25, 2026

Testing thread-safe EvtGen v3.0.0-beta1 in CMSSW #50935

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akritkbehera mentioned this pull request May 25, 2026

Upgrade EvtGen to v03.00.00 cms-sw/cmsdist#10580

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makortel reviewed May 26, 2026

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smuzaffar mentioned this pull request Jun 16, 2026

Belle2 decay table for EvtGen v3 cms-data/GeneratorInterface-EvtGenInterface#29

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