OpenModelica v1.27-fmi-fmpy from 2026-07-25 22:47:24 to 2026-08-02 12:33:12

Summary

OMC Commits1
Libraries Changed1
Number of Improvements2
Number of Regressions2
Number of Performance Improvements7
Number of Performance Regressions11

OpenModelica Changes

CommitDateAuthorSummary
f0056680002026-07-28 16:52:49 +0200AndreasFix spatialDistribution for nonzero start value of x (#16138)

OpenModelicaLibraryTesting Changes

CommitDateAuthorSummary
6697fc02026-07-06 18:25:17 +0200linuslangenkamp[GBODE] set Radau IIA 3-stage, remove embedded error estimate (#288)
d357aff2026-06-12 13:26:07 +0200AndreasFix OMSimulator submodule update when directory layout changes (#287)

Library Changes

LibraryChange
Buildings_latestFrom version 14.0.0-master (https://github.com/lbl-srg/modelica-buildings/archive/c4117ccec1f288ee6bc7f0ee0cb40a45d6940b0c.zip) FMPy version 0.3.29 to 14.0.0-master (https://github.com/lbl-srg/modelica-buildings/archive/2fc8e1e4c0c4995f1cee56bb378e24aafe799159.zip) FMPy version 0.3.29

Models Affected

AixLibAixLib.Fluid.Geothermal.Borefields.Validation.ConstantHeatInjection_100Boreholes (sim)SimCode performance 8.29 → 29.68
AixLibAixLib.ThermalZones.HighOrder.Examples.OFD_1Jan (sim)SimCode performance 22.98 → 0:01:32
BuildSysProBuildSysPro.IBPSA.Fluid.Geothermal.Borefields.Validation.ConstantHeatInjection_100Boreholes (sim)
BuildingSystemsBuildingSystems.Fluid.Geothermal.Borefields.Validation.ConstantHeatInjection_100Boreholes (sim)SimCode performance 26.72 → 14.72
Buildings_11Buildings.Air.Systems.SingleZone.VAV.Examples.ChillerDXHeatingEconomizer (sim)SimCode performance 6.79 → 13.11
Buildings_11Buildings.DHC.ETS.Combined.Examples.ChillerBorefield (sim)SimCode performance 32.00 → 15.89
Buildings_11Buildings.DHC.ETS.Combined.Subsystems.Validation.Borefield (sim)SimCode performance 45.21 → 19.85
Buildings_11Buildings.ThermalZones.Detailed.Examples.FFD.Tutorial.MixedConvection (sim)Simulate performance 1.27 → 0:07:02
Buildings_11Buildings.ThermalZones.Detailed.Examples.MixedAirFreeResponse (sim)SimCode performance 17.57 → 31.23
Buildings_12Buildings.DHC.Plants.Combined.Validation.AllElectricCWStorage (sim)Compile → Failed
Buildings_latestBuildings.Examples.ScalableBenchmarks.BuildingVAV.Examples.OneFloor_OneZone (sim)SimCode performance 6.72 → 11.56
Buildings_latestBuildings.Fluid.Geothermal.Borefields.Validation.ConstantHeatInjection_100Boreholes (sim)SimCode performance 7.29 → 12.82
IBPSA_latestIBPSA.Fluid.Geothermal.Borefields.Validation.ConstantHeatInjection_100Boreholes (sim)SimCode performance 16.58 → 8.26
IDEAS_devIDEAS.Fluid.Geothermal.Borefields.Validation.ConstantHeatInjection_100Boreholes (sim)SimCode performance 7.84 → 21.35
Modelica_4.1.0Modelica.Electrical.PowerConverters.Examples.ACAC.SoftStarter (sim)Compile → Simulate
Modelica_trunkModelica.Electrical.PowerConverters.Examples.ACAC.SoftStarter (sim)Compile → Simulate
SOFCPoliMiSOFCPoliMi.Tests.BenchmarkCammarata (sim)SimCode performance 16.55 → 34.66
SOFCPoliMiSOFCPoliMi.Tests.BenchmarkNonLinConcLosses (sim)Compile → Failed
ScalableTestSuiteScalableTestSuite.Electrical.DistributionSystemAC.ScaledExperiments.DistributionSystemLinearIndividual_N_20_M_20 (sim)Compile performance 0:01:54 → 0:04:26
ScalableTestSuiteScalableTestSuite.Thermal.Advection.ScaledExperiments.SteamPipe_N_320 (sim)Compile performance 0:03:23 → 0:01:46
ScalableTestSuite_nooptScalableTestSuite.Electrical.DistributionSystemAC.ScaledExperiments.DistributionSystemLinearIndividual_N_28_M_28 (sim)BackEnd performance 19.61 → 11.28
ScalableTestSuite_nooptScalableTestSuite.Electrical.DistributionSystemDC.ScaledExperiments.DistributionSystemModelicaActiveLoads_N_56_M_56 (sim)Simulate performance 5.57 → 10.75
ScalableTestSuite_nooptScalableTestSuite.Elementary.SimpleODE.ScaledExperiments.CascadedFirstOrder_N_25600 (sim)Simulate performance 30.12 → 14.64