Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo", uses=false) Using package IBPSA with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo) Using package Modelica with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo) Using package Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package ModelicaServices with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Running command: "" <> buildModelFMU(IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_Interfaces_Examples_ReverseFlowMassExchanger",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_Interfaces_Examples_ReverseFlowMassExchanger",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.00174/0.00174, allocations: 110.5 kB / 16.41 MB, free: 5.984 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001425/0.001425, allocations: 191 kB / 17.34 MB, free: 5.602 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.445/1.445, allocations: 222.9 MB / 241 MB, free: 15.16 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo): time 0.8235/0.8235, allocations: 126.7 MB / 417.9 MB, free: 12.29 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.00214/0.002141, allocations: 71.08 kB / 0.5736 GB, free: 27.18 MB / 446.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1505/0.1527, allocations: 78.87 MB / 0.6506 GB, free: 3.57 MB / 494.1 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger): time 0.7223/0.8751, allocations: 328.5 MB / 0.9713 GB, free: 10.32 MB / 0.7325 GB Notification: Performance of NFInst.instExpressions: time 0.04547/0.9206, allocations: 30.05 MB / 1.001 GB, free: 12.18 MB / 0.7637 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.004495/0.9251, allocations: 103.4 kB / 1.001 GB, free: 12.08 MB / 0.7637 GB Notification: Performance of NFTyping.typeComponents: time 0.006306/0.9314, allocations: 2.089 MB / 1.003 GB, free: 9.98 MB / 0.7637 GB Notification: Performance of NFTyping.typeBindings: time 0.01445/0.9459, allocations: 4.954 MB / 1.008 GB, free: 5.008 MB / 0.7637 GB Notification: Performance of NFTyping.typeClassSections: time 0.01054/0.9565, allocations: 3.642 MB / 1.011 GB, free: 1.387 MB / 0.7637 GB Notification: Performance of NFFlatten.flatten: time 0.01177/0.9683, allocations: 6.906 MB / 1.018 GB, free: 10.46 MB / 0.7794 GB Notification: Performance of NFFlatten.resolveConnections: time 0.004918/0.9732, allocations: 2.875 MB / 1.021 GB, free: 7.527 MB / 0.7794 GB Notification: Performance of NFEvalConstants.evaluate: time 0.01431/0.9876, allocations: 5.399 MB / 1.026 GB, free: 2.133 MB / 0.7794 GB Notification: Performance of NFSimplifyModel.simplify: time 0.005258/0.9929, allocations: 2.377 MB / 1.028 GB, free: 15.75 MB / 0.795 GB Notification: Performance of NFPackage.collectConstants: time 0.0009333/0.9938, allocations: 296 kB / 1.029 GB, free: 15.46 MB / 0.795 GB Notification: Performance of NFFlatten.collectFunctions: time 0.01017/1.004, allocations: 4.809 MB / 1.033 GB, free: 10.65 MB / 0.795 GB Notification: Performance of NFScalarize.scalarize: time 0.002053/1.006, allocations: 1.063 MB / 1.034 GB, free: 9.582 MB / 0.795 GB Notification: Performance of NFVerifyModel.verify: time 0.003186/1.009, allocations: 1.73 MB / 1.036 GB, free: 7.844 MB / 0.795 GB Notification: Performance of NFConvertDAE.convert: time 0.01198/1.021, allocations: 5.77 MB / 1.042 GB, free: 2.055 MB / 0.795 GB Notification: Performance of FrontEnd - DAE generated: time 7.294e-06/1.021, allocations: 0 / 1.042 GB, free: 2.055 MB / 0.795 GB Notification: Performance of FrontEnd: time 1.754e-06/1.021, allocations: 3.938 kB / 1.042 GB, free: 2.051 MB / 0.795 GB Notification: Performance of Transformations before backend: time 0.0001159/1.021, allocations: 0 / 1.042 GB, free: 2.051 MB / 0.795 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 536 * Number of variables: 536 Notification: Performance of Generate backend data structure: time 0.008957/1.03, allocations: 3.796 MB / 1.045 GB, free: 14.16 MB / 0.8106 GB Notification: Performance of prepare preOptimizeDAE: time 5.054e-05/1.03, allocations: 12.03 kB / 1.045 GB, free: 14.15 MB / 0.8106 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0004315/1.031, allocations: 303.6 kB / 1.046 GB, free: 13.84 MB / 0.8106 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.009694/1.041, allocations: 1.481 MB / 1.047 GB, free: 12.36 MB / 0.8106 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.005173/1.046, allocations: 2.098 MB / 1.049 GB, free: 10.18 MB / 0.8106 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0002182/1.046, allocations: 168.1 kB / 1.049 GB, free: 10.02 MB / 0.8106 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0006383/1.047, allocations: 220 kB / 1.05 GB, free: 9.801 MB / 0.8106 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.006659/1.053, allocations: 3.039 MB / 1.053 GB, free: 6.625 MB / 0.8106 GB Notification: Performance of preOpt findStateOrder (simulation): time 4.209e-05/1.053, allocations: 3.938 kB / 1.053 GB, free: 6.621 MB / 0.8106 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0002869/1.054, allocations: 92 kB / 1.053 GB, free: 6.531 MB / 0.8106 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 9.926e-05/1.054, allocations: 88 kB / 1.053 GB, free: 6.441 MB / 0.8106 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.007834/1.062, allocations: 3.103 MB / 1.056 GB, free: 3.32 MB / 0.8106 GB Warning: The model contains alias variables with redundant start and/or conflicting nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts. Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.3218/1.384, allocations: 14.03 MB / 1.069 GB, free: 317.1 MB / 0.8106 GB Notification: Performance of preOpt comSubExp (simulation): time 0.004361/1.388, allocations: 1.664 MB / 1.071 GB, free: 316.6 MB / 0.8106 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001874/1.39, allocations: 0.7682 MB / 1.072 GB, free: 316.3 MB / 0.8106 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0006034/1.39, allocations: 326.8 kB / 1.072 GB, free: 316 MB / 0.8106 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.04e-05/1.39, allocations: 53.41 kB / 1.072 GB, free: 316 MB / 0.8106 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.001295/1.392, allocations: 202.6 kB / 1.072 GB, free: 316 MB / 0.8106 GB Notification: Performance of pre-optimization done (n=110): time 5.15e-06/1.392, allocations: 0 / 1.072 GB, free: 316 MB / 0.8106 GB Notification: Performance of matching and sorting (n=110): time 0.006059/1.398, allocations: 2.368 MB / 1.075 GB, free: 315.2 MB / 0.8106 GB Notification: Performance of inlineWhenForInitialization (initialization): time 3.982e-05/1.398, allocations: 65.98 kB / 1.075 GB, free: 315.1 MB / 0.8106 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.004045/1.402, allocations: 2.514 MB / 1.077 GB, free: 314.2 MB / 0.8106 GB Notification: Performance of collectPreVariables (initialization): time 0.0002262/1.402, allocations: 59.59 kB / 1.077 GB, free: 314.2 MB / 0.8106 GB Notification: Performance of collectInitialEqns (initialization): time 0.0008343/1.403, allocations: 1.285 MB / 1.079 GB, free: 313.2 MB / 0.8106 GB Notification: Performance of collectInitialBindings (initialization): time 0.0003062/1.403, allocations: 413.6 kB / 1.079 GB, free: 313 MB / 0.8106 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0007715/1.404, allocations: 387.6 kB / 1.079 GB, free: 312.8 MB / 0.8106 GB Notification: Performance of setup shared object (initialization): time 4.607e-05/1.404, allocations: 306.1 kB / 1.08 GB, free: 312.5 MB / 0.8106 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.002673/1.407, allocations: 0.9467 MB / 1.081 GB, free: 312.2 MB / 0.8106 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.002754/1.41, allocations: 1.568 MB / 1.082 GB, free: 311.2 MB / 0.8106 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.004313/1.414, allocations: 2.231 MB / 1.084 GB, free: 310 MB / 0.8106 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.543e-05/1.414, allocations: 3.375 kB / 1.084 GB, free: 310 MB / 0.8106 GB Notification: Performance of matching and sorting (n=210) (initialization): time 0.006515/1.421, allocations: 2.762 MB / 1.087 GB, free: 309.1 MB / 0.8106 GB Notification: Performance of prepare postOptimizeDAE: time 7.283e-05/1.421, allocations: 74.14 kB / 1.087 GB, free: 309 MB / 0.8106 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.555e-05/1.421, allocations: 14.28 kB / 1.087 GB, free: 309 MB / 0.8106 GB Notification: Performance of postOpt tearingSystem (initialization): time 3.559e-05/1.421, allocations: 21.59 kB / 1.087 GB, free: 309 MB / 0.8106 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002827/1.424, allocations: 0.5449 MB / 1.088 GB, free: 309 MB / 0.8106 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0009919/1.425, allocations: 2.396 MB / 1.09 GB, free: 306.6 MB / 0.8106 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.003586/1.428, allocations: 277.4 kB / 1.09 GB, free: 306.6 MB / 0.8106 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002396/1.428, allocations: 95.64 kB / 1.09 GB, free: 306.6 MB / 0.8106 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.003373/1.432, allocations: 1.377 MB / 1.092 GB, free: 306 MB / 0.8106 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.00249/1.434, allocations: 1.571 MB / 1.093 GB, free: 304.8 MB / 0.8106 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.00406/1.438, allocations: 2.218 MB / 1.095 GB, free: 303.3 MB / 0.8106 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 1.399e-05/1.438, allocations: 3.938 kB / 1.095 GB, free: 303.3 MB / 0.8106 GB Notification: Performance of matching and sorting (n=210) (initialization_lambda0): time 0.006087/1.445, allocations: 2.758 MB / 1.098 GB, free: 302 MB / 0.8106 GB Notification: Performance of prepare postOptimizeDAE: time 5.624e-05/1.445, allocations: 80.95 kB / 1.098 GB, free: 301.9 MB / 0.8106 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.784e-05/1.445, allocations: 15.81 kB / 1.098 GB, free: 301.9 MB / 0.8106 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.973e-05/1.445, allocations: 19.59 kB / 1.098 GB, free: 301.9 MB / 0.8106 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.002256/1.447, allocations: 0.4923 MB / 1.099 GB, free: 301.7 MB / 0.8106 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 2.418e-05/1.447, allocations: 31.55 kB / 1.099 GB, free: 301.7 MB / 0.8106 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.003308/1.45, allocations: 289.6 kB / 1.099 GB, free: 301.6 MB / 0.8106 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001764/1.45, allocations: 101.4 kB / 1.099 GB, free: 301.6 MB / 0.8106 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 59 * Number of states: 0 () * Number of discrete variables: 4 (masExcRev.i2_w,masExcRev.i1_w,masExcFor.i2_w,masExcFor.i1_w) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (208): * Single equations (assignments): 202 * Array equations: 0 * Algorithm blocks: 2 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 4 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details (not torn): * Constant Jacobian (size): 0 systems * Linear Jacobian (size,density): 0 systems * Non-linear Jacobian (size): 4 systems {1, 1, 1, 1} * Without analytic Jacobian (size): 0 systems Notification: Performance of prepare postOptimizeDAE: time 0.00057/1.451, allocations: 287.8 kB / 1.099 GB, free: 301.3 MB / 0.8106 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0005723/1.452, allocations: 276.6 kB / 1.1 GB, free: 301.2 MB / 0.8106 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004038/1.456, allocations: 1.836 MB / 1.101 GB, free: 300.2 MB / 0.8106 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.135e-05/1.456, allocations: 10.91 kB / 1.101 GB, free: 300.2 MB / 0.8106 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.572e-06/1.456, allocations: 4.25 kB / 1.101 GB, free: 300.2 MB / 0.8106 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.1e-05/1.456, allocations: 11.97 kB / 1.101 GB, free: 300.2 MB / 0.8106 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.007393/1.463, allocations: 4.503 MB / 1.106 GB, free: 297.3 MB / 0.8106 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 9.998e-06/1.463, allocations: 6.594 kB / 1.106 GB, free: 297.3 MB / 0.8106 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001552/1.465, allocations: 299.8 kB / 1.106 GB, free: 297.2 MB / 0.8106 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.356e-05/1.465, allocations: 10.47 kB / 1.106 GB, free: 297.2 MB / 0.8106 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 8.765e-05/1.465, allocations: 34.83 kB / 1.106 GB, free: 297.2 MB / 0.8106 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0006661/1.466, allocations: 2.368 MB / 1.108 GB, free: 294.8 MB / 0.8106 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.92e-06/1.466, allocations: 10.84 kB / 1.108 GB, free: 294.8 MB / 0.8106 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.003724/1.469, allocations: 1.987 MB / 1.11 GB, free: 293.1 MB / 0.8106 GB Notification: Performance of postOpt removeConstants (simulation): time 0.001155/1.47, allocations: 0.5342 MB / 1.111 GB, free: 292.6 MB / 0.8106 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0003831/1.471, allocations: 39.92 kB / 1.111 GB, free: 292.5 MB / 0.8106 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002122/1.473, allocations: 176.3 kB / 1.111 GB, free: 292.3 MB / 0.8106 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001236/1.473, allocations: 80.78 kB / 1.111 GB, free: 292.3 MB / 0.8106 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001332/1.473, allocations: 66.7 kB / 1.111 GB, free: 292.2 MB / 0.8106 GB Notification: Performance of sorting global known variables: time 0.002302/1.476, allocations: 1.735 MB / 1.113 GB, free: 290.5 MB / 0.8106 GB Notification: Performance of sort global known variables: time 2.3e-07/1.476, allocations: 0 / 1.113 GB, free: 290.5 MB / 0.8106 GB Notification: Performance of remove unused functions: time 0.003043/1.479, allocations: 1.293 MB / 1.114 GB, free: 289.2 MB / 0.8106 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 25 * Number of states: 0 () * Number of discrete variables: 0 () * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (110): * Single equations (assignments): 106 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 4 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details (not torn): * Constant Jacobian (size): 0 systems * Linear Jacobian (size,density): 0 systems * Non-linear Jacobian (size): 4 systems {1, 1, 1, 1} * Without analytic Jacobian (size): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.004128/1.483, allocations: 2.812 MB / 1.117 GB, free: 286.4 MB / 0.8106 GB Notification: Performance of simCode: created initialization part: time 0.007563/1.49, allocations: 3.563 MB / 1.12 GB, free: 282.8 MB / 0.8106 GB Notification: Performance of simCode: created event and clocks part: time 9.197e-06/1.49, allocations: 7.859 kB / 1.12 GB, free: 282.8 MB / 0.8106 GB Notification: Performance of simCode: created simulation system equations: time 0.00169/1.492, allocations: 0.8038 MB / 1.121 GB, free: 282 MB / 0.8106 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.005599/1.498, allocations: 1.2 MB / 1.122 GB, free: 280.8 MB / 0.8106 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.02708/1.525, allocations: 18.81 MB / 1.141 GB, free: 261.3 MB / 0.8106 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0008355/1.526, allocations: 1.701 MB / 1.142 GB, free: 259.6 MB / 0.8106 GB Notification: Performance of simCode: alias equations: time 0.002743/1.528, allocations: 0.7755 MB / 1.143 GB, free: 258.8 MB / 0.8106 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0012/1.53, allocations: 1.015 MB / 1.144 GB, free: 257.8 MB / 0.8106 GB Notification: Performance of SimCode: time 7.72e-07/1.53, allocations: 0 / 1.144 GB, free: 257.8 MB / 0.8106 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.09704/1.627, allocations: 65.1 MB / 1.208 GB, free: 193.4 MB / 0.8106 GB Notification: Performance of buildModelFMU: Generate platform static: time 17.18/18.81, allocations: 10.09 kB / 1.208 GB, free: 193.4 MB / 0.8106 GB (rm -f IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger.sim & python3 -m fmpy simulate --output-file IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger_res.csv --start-time 0 --stop-time 1 --timeout 50 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 0.0004 IBPSA_latest_IBPSA_Fluid_Interfaces_Examples_ReverseFlowMassExchanger.fmu > IBPSA_latest_IBPSA.Fluid.Interfaces.Examples.ReverseFlowMassExchanger.pipe 2>&1)