Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8_Buildings.Fluid.MixingVolumes.Validation.MixingVolume.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 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo", uses=false) Using package Buildings with version 8.1.4 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo) Using package Modelica with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+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(Buildings.Fluid.MixingVolumes.Validation.MixingVolume,fileNamePrefix="Buildings_8_Buildings_Fluid_MixingVolumes_Validation_MixingVolume",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.MixingVolumes.Validation.MixingVolume,fileNamePrefix="Buildings_8_Buildings_Fluid_MixingVolumes_Validation_MixingVolume",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 0.001188/0.001188, allocations: 111.3 kB / 15.23 MB, free: 0.6602 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001281/0.001281, allocations: 192.7 kB / 16.13 MB, free: 6.707 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.151/1.151, allocations: 205.1 MB / 222 MB, free: 4.742 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo): time 1.568/1.568, allocations: 292.3 MB / 0.5484 GB, free: 13.7 MB / 462.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.00128/0.00128, allocations: 64.34 kB / 0.6709 GB, free: 26.53 MB / 0.5294 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1685/0.1698, allocations: 114.5 MB / 0.7828 GB, free: 13.94 MB / 0.6075 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.MixingVolumes.Validation.MixingVolume): time 0.496/0.6659, allocations: 240.5 MB / 1.018 GB, free: 1.633 MB / 0.7325 GB Notification: Performance of NFInst.instExpressions: time 0.01719/0.6831, allocations: 15.99 MB / 1.033 GB, free: 7.715 MB / 0.7481 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001672/0.6848, allocations: 71.31 kB / 1.033 GB, free: 7.684 MB / 0.7481 GB Notification: Performance of NFTyping.typeComponents: time 0.002277/0.6871, allocations: 1.017 MB / 1.034 GB, free: 6.926 MB / 0.7481 GB Notification: Performance of NFTyping.typeBindings: time 0.006633/0.6938, allocations: 3.596 MB / 1.038 GB, free: 4.176 MB / 0.7481 GB Notification: Performance of NFTyping.typeClassSections: time 0.00326/0.697, allocations: 1.601 MB / 1.039 GB, free: 3 MB / 0.7481 GB Notification: Performance of NFFlatten.flatten: time 0.005291/0.7023, allocations: 7.398 MB / 1.047 GB, free: 15.01 MB / 0.7637 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001373/0.7037, allocations: 1.418 MB / 1.048 GB, free: 14.12 MB / 0.7637 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003446/0.7072, allocations: 2.332 MB / 1.05 GB, free: 12.8 MB / 0.7637 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002261/0.7094, allocations: 1.776 MB / 1.052 GB, free: 11.81 MB / 0.7637 GB Notification: Performance of NFPackage.collectConstants: time 0.0002007/0.7096, allocations: 100.9 kB / 1.052 GB, free: 11.81 MB / 0.7637 GB Notification: Performance of NFFlatten.collectFunctions: time 0.004312/0.714, allocations: 3.156 MB / 1.055 GB, free: 9.996 MB / 0.7637 GB Notification: Performance of NFScalarize.scalarize: time 0.0005589/0.7145, allocations: 0.6959 MB / 1.056 GB, free: 9.543 MB / 0.7637 GB Notification: Performance of NFVerifyModel.verify: time 0.0009086/0.7155, allocations: 1.065 MB / 1.057 GB, free: 8.902 MB / 0.7637 GB Notification: Performance of NFConvertDAE.convert: time 0.003712/0.7192, allocations: 3.636 MB / 1.06 GB, free: 6.191 MB / 0.7637 GB Notification: Performance of FrontEnd - DAE generated: time 3.857e-06/0.7192, allocations: 4 kB / 1.06 GB, free: 6.188 MB / 0.7637 GB Notification: Performance of FrontEnd: time 7.51e-07/0.7192, allocations: 0 / 1.06 GB, free: 6.188 MB / 0.7637 GB Notification: Performance of Transformations before backend: time 1.701e-05/0.7192, allocations: 0 / 1.06 GB, free: 6.188 MB / 0.7637 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 363 * Number of variables: 363 Notification: Performance of Generate backend data structure: time 0.003563/0.7228, allocations: 2.483 MB / 1.063 GB, free: 3.648 MB / 0.7637 GB Notification: Performance of prepare preOptimizeDAE: time 3.238e-05/0.7228, allocations: 8.031 kB / 1.063 GB, free: 3.641 MB / 0.7637 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002189/0.723, allocations: 215.1 kB / 1.063 GB, free: 3.422 MB / 0.7637 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002698/0.7258, allocations: 0.5125 MB / 1.064 GB, free: 2.906 MB / 0.7637 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001644/0.7274, allocations: 1.257 MB / 1.065 GB, free: 1.594 MB / 0.7637 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.000128/0.7275, allocations: 178.2 kB / 1.065 GB, free: 1.406 MB / 0.7637 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001822/0.7277, allocations: 152 kB / 1.065 GB, free: 1.258 MB / 0.7637 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002436/0.7302, allocations: 1.737 MB / 1.067 GB, free: 15.45 MB / 0.7794 GB Notification: Performance of preOpt findStateOrder (simulation): time 3.023e-05/0.7302, allocations: 4 kB / 1.067 GB, free: 15.44 MB / 0.7794 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001242/0.7303, allocations: 67.92 kB / 1.067 GB, free: 15.38 MB / 0.7794 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.509e-05/0.7304, allocations: 62.69 kB / 1.067 GB, free: 15.31 MB / 0.7794 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002181/0.7326, allocations: 1.365 MB / 1.068 GB, free: 13.94 MB / 0.7794 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 0.007276/0.7399, allocations: 8.171 MB / 1.076 GB, free: 5.066 MB / 0.7794 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001301/0.7412, allocations: 0.9084 MB / 1.077 GB, free: 4.148 MB / 0.7794 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0007693/0.742, allocations: 0.5341 MB / 1.078 GB, free: 3.613 MB / 0.7794 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0005365/0.7425, allocations: 316.5 kB / 1.078 GB, free: 3.25 MB / 0.7794 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.329e-05/0.7426, allocations: 59.44 kB / 1.078 GB, free: 3.184 MB / 0.7794 GB Notification: Performance of pre-optimization done (n=96): time 1.883e-06/0.7426, allocations: 0 / 1.078 GB, free: 3.184 MB / 0.7794 GB Notification: Performance of matching and sorting (n=102): time 0.005805/0.7484, allocations: 3.101 MB / 1.081 GB, free: 24 kB / 0.7794 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.728e-05/0.7484, allocations: 64.41 kB / 1.081 GB, free: 15.95 MB / 0.795 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001285/0.7497, allocations: 1.254 MB / 1.082 GB, free: 14.69 MB / 0.795 GB Notification: Performance of collectPreVariables (initialization): time 7.524e-05/0.7498, allocations: 49.7 kB / 1.082 GB, free: 14.63 MB / 0.795 GB Notification: Performance of collectInitialEqns (initialization): time 0.0005187/0.7503, allocations: 0.8092 MB / 1.083 GB, free: 13.82 MB / 0.795 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002551/0.7506, allocations: 362.7 kB / 1.084 GB, free: 13.46 MB / 0.795 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003081/0.7509, allocations: 226.8 kB / 1.084 GB, free: 13.23 MB / 0.795 GB Notification: Performance of setup shared object (initialization): time 0.0001209/0.751, allocations: 357.9 kB / 1.084 GB, free: 12.88 MB / 0.795 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.000754/0.7518, allocations: 449.8 kB / 1.085 GB, free: 12.43 MB / 0.795 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0009622/0.7528, allocations: 0.8235 MB / 1.085 GB, free: 11.44 MB / 0.795 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001666/0.7544, allocations: 1.256 MB / 1.087 GB, free: 10.06 MB / 0.795 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 7.624e-06/0.7545, allocations: 4 kB / 1.087 GB, free: 10.05 MB / 0.795 GB Notification: Performance of matching and sorting (n=150) (initialization): time 0.002076/0.7565, allocations: 1.394 MB / 1.088 GB, free: 8.656 MB / 0.795 GB Notification: Performance of prepare postOptimizeDAE: time 1.606e-05/0.7566, allocations: 11.94 kB / 1.088 GB, free: 8.645 MB / 0.795 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.038e-05/0.7566, allocations: 8 kB / 1.088 GB, free: 8.637 MB / 0.795 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.004e-05/0.7566, allocations: 16 kB / 1.088 GB, free: 8.621 MB / 0.795 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001026/0.7576, allocations: 275.6 kB / 1.088 GB, free: 8.352 MB / 0.795 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.862e-05/0.7577, allocations: 24.31 kB / 1.088 GB, free: 8.328 MB / 0.795 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001248/0.7589, allocations: 168.9 kB / 1.088 GB, free: 8.168 MB / 0.795 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.9e-05/0.759, allocations: 57.7 kB / 1.088 GB, free: 8.113 MB / 0.795 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.001089/0.7601, allocations: 0.764 MB / 1.089 GB, free: 7.348 MB / 0.795 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.0009308/0.761, allocations: 0.8234 MB / 1.09 GB, free: 6.348 MB / 0.795 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.001601/0.7627, allocations: 1.233 MB / 1.091 GB, free: 4.988 MB / 0.795 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 4.839e-06/0.7627, allocations: 3.938 kB / 1.091 GB, free: 4.984 MB / 0.795 GB Notification: Performance of matching and sorting (n=150) (initialization_lambda0): time 0.001993/0.7647, allocations: 1.39 MB / 1.093 GB, free: 3.586 MB / 0.795 GB Notification: Performance of prepare postOptimizeDAE: time 1.032e-05/0.7647, allocations: 8 kB / 1.093 GB, free: 3.578 MB / 0.795 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 8.005e-06/0.7647, allocations: 8 kB / 1.093 GB, free: 3.57 MB / 0.795 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.278e-05/0.7647, allocations: 16 kB / 1.093 GB, free: 3.555 MB / 0.795 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0009846/0.7657, allocations: 275.5 kB / 1.093 GB, free: 3.285 MB / 0.795 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.85e-05/0.7657, allocations: 23.92 kB / 1.093 GB, free: 3.262 MB / 0.795 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.00122/0.767, allocations: 164 kB / 1.093 GB, free: 3.102 MB / 0.795 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.174e-05/0.767, allocations: 52 kB / 1.093 GB, free: 3.051 MB / 0.795 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 41 * Number of states: 0 () * Number of discrete variables: 4 (vol.regularFlow[1],vol.regularFlow[2],vol.inFlow[2],vol.inFlow[1]) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (150): * Single equations (assignments): 150 * 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 0.0002101/0.7673, allocations: 266.7 kB / 1.093 GB, free: 2.785 MB / 0.795 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002045/0.7675, allocations: 174 kB / 1.094 GB, free: 2.613 MB / 0.795 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001854/0.7693, allocations: 1.146 MB / 1.095 GB, free: 1.461 MB / 0.795 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 7.764e-06/0.7693, allocations: 8 kB / 1.095 GB, free: 1.453 MB / 0.795 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 4.608e-06/0.7693, allocations: 0 / 1.095 GB, free: 1.453 MB / 0.795 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001481/0.7708, allocations: 1.079 MB / 1.096 GB, free: 328 kB / 0.795 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.003742/0.7746, allocations: 2.774 MB / 1.098 GB, free: 13.46 MB / 0.8106 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 3.266e-06/0.7746, allocations: 0 / 1.098 GB, free: 13.46 MB / 0.8106 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001121/0.7757, allocations: 255.8 kB / 1.099 GB, free: 13.21 MB / 0.8106 GB Notification: Performance of postOpt tearingSystem (simulation): time 7.715e-06/0.7757, allocations: 8 kB / 1.099 GB, free: 13.21 MB / 0.8106 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 6.027e-05/0.7758, allocations: 27.98 kB / 1.099 GB, free: 13.18 MB / 0.8106 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 5.059e-06/0.7758, allocations: 4 kB / 1.099 GB, free: 13.18 MB / 0.8106 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.773e-06/0.7758, allocations: 4 kB / 1.099 GB, free: 13.17 MB / 0.8106 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002478/0.7783, allocations: 1.805 MB / 1.1 GB, free: 11.33 MB / 0.8106 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0004454/0.7788, allocations: 342.9 kB / 1.101 GB, free: 10.97 MB / 0.8106 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.00017/0.7789, allocations: 24 kB / 1.101 GB, free: 10.95 MB / 0.8106 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001082/0.78, allocations: 131.7 kB / 1.101 GB, free: 10.82 MB / 0.8106 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001272/0.7802, allocations: 72.94 kB / 1.101 GB, free: 10.75 MB / 0.8106 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.691e-05/0.7802, allocations: 39.98 kB / 1.101 GB, free: 10.71 MB / 0.8106 GB Notification: Performance of sorting global known variables: time 0.0008708/0.7811, allocations: 0.8306 MB / 1.102 GB, free: 9.883 MB / 0.8106 GB Notification: Performance of sort global known variables: time 1.9e-07/0.7811, allocations: 4 kB / 1.102 GB, free: 9.879 MB / 0.8106 GB Notification: Performance of remove unused functions: time 0.001514/0.7826, allocations: 0.7696 MB / 1.103 GB, free: 9.109 MB / 0.8106 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * Number of states: 9 (vol1.dynBal.U,vol1.dynBal.m,vol1.dynBal.mXi[1],vol.medium.Xi[1],vol.medium.T,vol.m,vol2.dynBal.U,vol2.dynBal.m,vol2.dynBal.mXi[1]) * 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 (102): * Single equations (assignments): 102 * 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 0.003057/0.7857, allocations: 2.526 MB / 1.105 GB, free: 6.543 MB / 0.8106 GB Notification: Performance of simCode: created initialization part: time 0.002533/0.7883, allocations: 1.725 MB / 1.107 GB, free: 4.824 MB / 0.8106 GB Notification: Performance of simCode: created event and clocks part: time 3.697e-06/0.7883, allocations: 4 kB / 1.107 GB, free: 4.82 MB / 0.8106 GB Notification: Performance of simCode: created simulation system equations: time 0.0007679/0.789, allocations: 0.5175 MB / 1.107 GB, free: 4.305 MB / 0.8106 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003688/0.7927, allocations: 0.9786 MB / 1.108 GB, free: 3.332 MB / 0.8106 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01606/0.8088, allocations: 13.63 MB / 1.122 GB, free: 4.957 MB / 0.8262 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0008131/0.8096, allocations: 1.438 MB / 1.123 GB, free: 3.484 MB / 0.8262 GB Notification: Performance of simCode: alias equations: time 0.001641/0.8113, allocations: 0.5563 MB / 1.123 GB, free: 2.922 MB / 0.8262 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000736/0.812, allocations: 0.6789 MB / 1.124 GB, free: 2.242 MB / 0.8262 GB Notification: Performance of SimCode: time 3.01e-07/0.812, allocations: 3.938 kB / 1.124 GB, free: 2.238 MB / 0.8262 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 3.169/3.981, allocations: 43.66 MB / 1.167 GB, free: 7.156 MB / 0.8731 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.02721/4.008, allocations: 244.2 kB / 1.167 GB, free: 6.898 MB / 0.8731 GB Notification: Performance of buildModelFMU: Generate platform static: time 3.725/7.733, allocations: 3.938 kB / 1.167 GB, free: 6.895 MB / 0.8731 GB (rm -f Buildings_8_Buildings.Fluid.MixingVolumes.Validation.MixingVolume.pipe ; mkfifo Buildings_8_Buildings.Fluid.MixingVolumes.Validation.MixingVolume.pipe ; head -c 1048576 < Buildings_8_Buildings.Fluid.MixingVolumes.Validation.MixingVolume.pipe >> ../files/Buildings_8_Buildings.Fluid.MixingVolumes.Validation.MixingVolume.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator --tempDir=temp_Buildings_8_Buildings_Fluid_MixingVolumes_Validation_MixingVolume_fmu --startTime=0 --stopTime=2 --timeout=50 --tolerance=1e-09 Buildings_8_Buildings_Fluid_MixingVolumes_Validation_MixingVolume.fmu > Buildings_8_Buildings.Fluid.MixingVolumes.Validation.MixingVolume.pipe 2>&1)