Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr BuildingSystems_BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance.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/NcDataReader2 2.5.1-master/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo", uses=false) Using package BuildingSystems with version 2.0.0-beta (/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo) Using package NcDataReader2 with version 2.5.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/NcDataReader2 2.5.1-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(BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance,fileNamePrefix="BuildingSystems_BuildingSystems_Fluid_MixingVolumes_Validation_MoistureMixingConservationDynamicBalance",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance,fileNamePrefix="BuildingSystems_BuildingSystems_Fluid_MixingVolumes_Validation_MoistureMixingConservationDynamicBalance",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 0.001028/0.001028, allocations: 111.3 kB / 15.23 MB, free: 0.6367 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001015/0.001015, allocations: 196.9 kB / 16.14 MB, free: 6.734 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.294/1.294, allocations: 222.9 MB / 239.8 MB, free: 4.613 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/NcDataReader2 2.5.1-master/package.mo): time 0.00285/0.00285, allocations: 274.7 kB / 290.2 MB, free: 2.227 MB / 238.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo): time 0.9123/0.9123, allocations: 169.2 MB / 0.4977 GB, free: 14.17 MB / 382.1 MB Notification: Performance of FrontEnd - loaded program: time 0.001624/0.001624, allocations: 92.47 kB / 0.5946 GB, free: 28.32 MB / 430.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1289/0.1305, allocations: 86.98 MB / 0.6795 GB, free: 1.086 MB / 478.1 MB Notification: Performance of NFInst.instantiate(BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance): time 0.4341/0.5646, allocations: 220.3 MB / 0.8947 GB, free: 8.379 MB / 0.6075 GB Notification: Performance of NFInst.instExpressions: time 0.01416/0.5788, allocations: 12.21 MB / 0.9066 GB, free: 14.5 MB / 0.6231 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001451/0.5803, allocations: 63.72 kB / 0.9067 GB, free: 14.48 MB / 0.6231 GB Notification: Performance of NFTyping.typeComponents: time 0.001625/0.5819, allocations: 0.7188 MB / 0.9074 GB, free: 13.88 MB / 0.6231 GB Notification: Performance of NFTyping.typeBindings: time 0.004939/0.5869, allocations: 2.694 MB / 0.91 GB, free: 11.8 MB / 0.6231 GB Notification: Performance of NFTyping.typeClassSections: time 0.002501/0.5894, allocations: 1.278 MB / 0.9113 GB, free: 10.57 MB / 0.6231 GB Notification: Performance of NFFlatten.flatten: time 0.004793/0.5942, allocations: 6.108 MB / 0.9172 GB, free: 4.449 MB / 0.6231 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001492/0.5957, allocations: 1.493 MB / 0.9187 GB, free: 2.918 MB / 0.6231 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003924/0.5996, allocations: 2.207 MB / 0.9208 GB, free: 0.707 MB / 0.6231 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002496/0.6021, allocations: 1.597 MB / 0.9224 GB, free: 15.12 MB / 0.6387 GB Notification: Performance of NFPackage.collectConstants: time 0.0002112/0.6024, allocations: 100 kB / 0.9225 GB, free: 15.02 MB / 0.6387 GB Notification: Performance of NFFlatten.collectFunctions: time 0.004066/0.6064, allocations: 2.482 MB / 0.9249 GB, free: 12.53 MB / 0.6387 GB Notification: Performance of NFScalarize.scalarize: time 0.0005274/0.607, allocations: 0.6309 MB / 0.9255 GB, free: 11.9 MB / 0.6387 GB Notification: Performance of NFVerifyModel.verify: time 0.000852/0.6078, allocations: 0.9639 MB / 0.9265 GB, free: 10.93 MB / 0.6387 GB Notification: Performance of NFConvertDAE.convert: time 0.00306/0.6109, allocations: 3.345 MB / 0.9297 GB, free: 7.574 MB / 0.6387 GB Notification: Performance of FrontEnd - DAE generated: time 3.557e-06/0.6109, allocations: 0 / 0.9297 GB, free: 7.574 MB / 0.6387 GB Notification: Performance of FrontEnd: time 6.82e-07/0.6109, allocations: 0 / 0.9297 GB, free: 7.574 MB / 0.6387 GB Notification: Performance of Transformations before backend: time 1.635e-05/0.6109, allocations: 4 kB / 0.9297 GB, free: 7.57 MB / 0.6387 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 351 * Number of variables: 351 Notification: Performance of Generate backend data structure: time 0.003195/0.6141, allocations: 2.273 MB / 0.932 GB, free: 5.242 MB / 0.6387 GB Notification: Performance of prepare preOptimizeDAE: time 3.431e-05/0.6142, allocations: 8.031 kB / 0.932 GB, free: 5.234 MB / 0.6387 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002321/0.6144, allocations: 210.8 kB / 0.9322 GB, free: 5.02 MB / 0.6387 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002872/0.6173, allocations: 0.4971 MB / 0.9327 GB, free: 4.52 MB / 0.6387 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001711/0.619, allocations: 1.263 MB / 0.9339 GB, free: 3.199 MB / 0.6387 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.072e-05/0.6191, allocations: 106.8 kB / 0.934 GB, free: 3.094 MB / 0.6387 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001971/0.6193, allocations: 151.9 kB / 0.9341 GB, free: 2.945 MB / 0.6387 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002379/0.6217, allocations: 1.764 MB / 0.9359 GB, free: 1.07 MB / 0.6387 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.83e-05/0.6217, allocations: 4 kB / 0.9359 GB, free: 1.066 MB / 0.6387 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001253/0.6219, allocations: 60 kB / 0.9359 GB, free: 1.008 MB / 0.6387 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.058e-05/0.6219, allocations: 54.53 kB / 0.936 GB, free: 0.9531 MB / 0.6387 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002018/0.6239, allocations: 1.399 MB / 0.9373 GB, free: 15.55 MB / 0.6544 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 0.007051/0.631, allocations: 7.297 MB / 0.9445 GB, free: 7.867 MB / 0.6544 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001471/0.6325, allocations: 1.055 MB / 0.9455 GB, free: 6.77 MB / 0.6544 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0008771/0.6334, allocations: 0.7022 MB / 0.9462 GB, free: 6.059 MB / 0.6544 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0001934/0.6336, allocations: 110.2 kB / 0.9463 GB, free: 5.934 MB / 0.6544 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.382e-05/0.6336, allocations: 55.55 kB / 0.9463 GB, free: 5.871 MB / 0.6544 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.000937/0.6346, allocations: 306.5 kB / 0.9466 GB, free: 5.57 MB / 0.6544 GB Notification: Performance of pre-optimization done (n=106): time 2.825e-06/0.6346, allocations: 0 / 0.9466 GB, free: 5.57 MB / 0.6544 GB Notification: Performance of matching and sorting (n=112): time 0.007314/0.6419, allocations: 4.415 MB / 0.9509 GB, free: 1.07 MB / 0.6544 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.007e-05/0.642, allocations: 171.2 kB / 0.9511 GB, free: 0.8672 MB / 0.6544 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001307/0.6433, allocations: 1.255 MB / 0.9523 GB, free: 15.6 MB / 0.67 GB Notification: Performance of collectPreVariables (initialization): time 8.116e-05/0.6434, allocations: 53.7 kB / 0.9524 GB, free: 15.54 MB / 0.67 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004943/0.6439, allocations: 0.7085 MB / 0.9531 GB, free: 14.83 MB / 0.67 GB Notification: Performance of collectInitialBindings (initialization): time 0.0003132/0.6442, allocations: 398.2 kB / 0.9535 GB, free: 14.43 MB / 0.67 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003495/0.6446, allocations: 259.4 kB / 0.9537 GB, free: 14.18 MB / 0.67 GB Notification: Performance of setup shared object (initialization): time 0.0001325/0.6447, allocations: 357.9 kB / 0.954 GB, free: 13.82 MB / 0.67 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.00079/0.6455, allocations: 0.5153 MB / 0.9545 GB, free: 13.3 MB / 0.67 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0009652/0.6465, allocations: 0.852 MB / 0.9554 GB, free: 12.33 MB / 0.67 GB Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: vol.dynBal.medium.p = vol.dynBal.p_start (sin.p = vol.dynBal.p_start) Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: vol1.dynBal.medium.p = vol1.dynBal.p_start (sin.p = vol1.dynBal.p_start) Warning: It was not possible to determine if the initialization problem is consistent, because of not evaluable parameters/start values during compile time: vol2.dynBal.medium.p = vol2.dynBal.p_start (sin.p = vol2.dynBal.p_start) Notification: Performance of analyzeInitialSystem (initialization): time 0.01068/0.6571, allocations: 4.757 MB / 0.96 GB, free: 7.418 MB / 0.67 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 9.718e-06/0.6572, allocations: 4 kB / 0.96 GB, free: 7.414 MB / 0.67 GB Notification: Performance of matching and sorting (n=169) (initialization): time 0.002189/0.6594, allocations: 1.596 MB / 0.9616 GB, free: 5.809 MB / 0.67 GB Notification: Performance of prepare postOptimizeDAE: time 1.962e-05/0.6594, allocations: 13.89 kB / 0.9616 GB, free: 5.797 MB / 0.67 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.141e-05/0.6594, allocations: 12 kB / 0.9616 GB, free: 5.785 MB / 0.67 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.063e-05/0.6594, allocations: 16 kB / 0.9616 GB, free: 5.77 MB / 0.67 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001061/0.6605, allocations: 283.5 kB / 0.9619 GB, free: 5.492 MB / 0.67 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 2.121e-05/0.6605, allocations: 23.92 kB / 0.9619 GB, free: 5.469 MB / 0.67 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001222/0.6618, allocations: 114 kB / 0.962 GB, free: 5.359 MB / 0.67 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.479e-05/0.6619, allocations: 59.98 kB / 0.9621 GB, free: 5.301 MB / 0.67 GB Warning: The initial conditions are over specified. The following 3 initial equations are redundant, so they are removed from the initialization system: vol.dynBal.medium.p = vol.dynBal.p_start vol1.dynBal.medium.p = vol1.dynBal.p_start vol2.dynBal.medium.p = vol2.dynBal.p_start. Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 37 * Number of states: 0 () * Number of discrete variables: 6 (intMasVapOut.local_reset,intEntIn.local_reset,intEntOut.local_reset,intMasFloIn.local_reset,intMasFloOut.local_reset,intMasFloVapIn.local_reset) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (169): * Single equations (assignments): 169 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.0005334/0.6624, allocations: 425.3 kB / 0.9625 GB, free: 4.875 MB / 0.67 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002823/0.6627, allocations: 162 kB / 0.9626 GB, free: 4.715 MB / 0.67 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.00189/0.6646, allocations: 1.271 MB / 0.9639 GB, free: 3.43 MB / 0.67 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.009e-05/0.6646, allocations: 12 kB / 0.9639 GB, free: 3.418 MB / 0.67 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 5.029e-06/0.6646, allocations: 0 / 0.9639 GB, free: 3.418 MB / 0.67 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001423/0.666, allocations: 1.24 MB / 0.9651 GB, free: 2.113 MB / 0.67 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.00493/0.671, allocations: 3.746 MB / 0.9688 GB, free: 14.17 MB / 0.6856 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.033e-05/0.671, allocations: 12 kB / 0.9688 GB, free: 14.16 MB / 0.6856 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.00106/0.6721, allocations: 247.6 kB / 0.969 GB, free: 13.91 MB / 0.6856 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.102e-05/0.6721, allocations: 12 kB / 0.969 GB, free: 13.9 MB / 0.6856 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 7.048e-05/0.6722, allocations: 43.94 kB / 0.9691 GB, free: 13.86 MB / 0.6856 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 1.485e-05/0.6722, allocations: 23.92 kB / 0.9691 GB, free: 13.84 MB / 0.6856 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 8.807e-06/0.6722, allocations: 16.42 kB / 0.9691 GB, free: 13.82 MB / 0.6856 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002425/0.6746, allocations: 2.097 MB / 0.9712 GB, free: 11.57 MB / 0.6856 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0004767/0.6751, allocations: 359 kB / 0.9715 GB, free: 11.2 MB / 0.6856 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001852/0.6753, allocations: 39.92 kB / 0.9715 GB, free: 11.16 MB / 0.6856 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001059/0.6764, allocations: 93.08 kB / 0.9716 GB, free: 11.07 MB / 0.6856 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001286/0.6765, allocations: 100.3 kB / 0.9717 GB, free: 10.97 MB / 0.6856 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 7.76e-05/0.6766, allocations: 51.98 kB / 0.9718 GB, free: 10.92 MB / 0.6856 GB Notification: Performance of sorting global known variables: time 0.0009459/0.6776, allocations: 0.8529 MB / 0.9726 GB, free: 10.07 MB / 0.6856 GB Notification: Performance of sort global known variables: time 1.21e-07/0.6776, allocations: 0 / 0.9726 GB, free: 10.07 MB / 0.6856 GB Notification: Performance of remove unused functions: time 0.001048/0.6786, allocations: 428 kB / 0.973 GB, free: 9.648 MB / 0.6856 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 44 * Number of states: 12 (vol.dynBal.medium.Xi[1],vol.dynBal.U,vol1.dynBal.medium.Xi[1],vol1.dynBal.U,vol2.dynBal.medium.Xi[1],vol2.dynBal.U,intMasFloVapIn.y,intMasFloOut.y,intMasFloIn.y,intEntOut.y,intEntIn.y,intMasVapOut.y) * 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 (115): * Single equations (assignments): 115 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.002943/0.6816, allocations: 2.788 MB / 0.9757 GB, free: 6.711 MB / 0.6856 GB Notification: Performance of simCode: created initialization part: time 0.001622/0.6832, allocations: 1.216 MB / 0.9769 GB, free: 5.5 MB / 0.6856 GB Notification: Performance of simCode: created event and clocks part: time 4.929e-06/0.6832, allocations: 7.938 kB / 0.9769 GB, free: 5.492 MB / 0.6856 GB Notification: Performance of simCode: created simulation system equations: time 0.0007/0.6839, allocations: 0.5408 MB / 0.9775 GB, free: 4.949 MB / 0.6856 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003564/0.6875, allocations: 0.885 MB / 0.9783 GB, free: 4.074 MB / 0.6856 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01665/0.7042, allocations: 14.25 MB / 0.9922 GB, free: 4.875 MB / 0.7012 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000817/0.705, allocations: 1.376 MB / 0.9936 GB, free: 3.465 MB / 0.7012 GB Notification: Performance of simCode: alias equations: time 0.001185/0.7062, allocations: 389.3 kB / 0.994 GB, free: 3.078 MB / 0.7012 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0007886/0.707, allocations: 0.6399 MB / 0.9946 GB, free: 2.438 MB / 0.7012 GB Notification: Performance of SimCode: time 2.11e-07/0.707, allocations: 0 / 0.9946 GB, free: 2.438 MB / 0.7012 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 2.954/3.661, allocations: 41.27 MB / 1.035 GB, free: 9.773 MB / 0.7481 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0002574/3.661, allocations: 301.5 kB / 1.035 GB, free: 9.387 MB / 0.7481 GB Notification: Performance of buildModelFMU: Generate platform static: time 3.765/7.425, allocations: 2.953 kB / 1.035 GB, free: 9.387 MB / 0.7481 GB (rm -f BuildingSystems_BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance.pipe ; mkfifo BuildingSystems_BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance.pipe ; head -c 1048576 < BuildingSystems_BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance.pipe >> ../files/BuildingSystems_BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator --tempDir=temp_BuildingSystems_BuildingSystems_Fluid_MixingVolumes_Validation_MoistureMixingConservationDynamicBalance_fmu --startTime=0 --stopTime=1 --timeout=50 --tolerance=1e-06 BuildingSystems_BuildingSystems_Fluid_MixingVolumes_Validation_MoistureMixingConservationDynamicBalance.fmu > BuildingSystems_BuildingSystems.Fluid.MixingVolumes.Validation.MoistureMixingConservationDynamicBalance.pipe 2>&1)