Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8.0.0_Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+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/ModelicaServices 3.2.3+maint.om/package.mo", uses=false) Using package ModelicaServices with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/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 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo) Using package Buildings with version 8.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo) Running command: "" <> buildModelFMU(Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent,fileNamePrefix="Buildings_8_0_0_Buildings_Fluid_Actuators_Dampers_Validation_PressureIndependent",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent,fileNamePrefix="Buildings_8_0_0_Buildings_Fluid_Actuators_Dampers_Validation_PressureIndependent",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.0.0/package.mo): time 1.894/1.894, allocations: 287.4 MB / 302.5 MB, free: 8.242 MB / 234.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.001258/0.001259, allocations: 182.2 kB / 371.1 MB, free: 10.83 MB / 298.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.665/1.665, allocations: 205.4 MB / 0.6298 GB, free: 10.57 MB / 458.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.0008203/0.0008202, allocations: 94.3 kB / 0.7431 GB, free: 6.566 MB / 0.5573 GB Notification: Performance of FrontEnd - loaded program: time 0.0005868/0.0005869, allocations: 14.44 kB / 0.8662 GB, free: 140.5 MB / 0.6198 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2497/0.2503, allocations: 115.3 MB / 0.9787 GB, free: 28.11 MB / 0.6198 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent): time 0.6016/0.8519, allocations: 167.6 MB / 1.142 GB, free: 12.97 MB / 0.698 GB Notification: Performance of NFInst.instExpressions: time 0.01709/0.8691, allocations: 12.58 MB / 1.155 GB, free: 7.828 MB / 0.698 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.001854/0.871, allocations: 30.81 kB / 1.155 GB, free: 7.812 MB / 0.698 GB Notification: Performance of NFTyping.typeComponents: time 0.001367/0.8724, allocations: 304.9 kB / 1.155 GB, free: 7.629 MB / 0.698 GB Notification: Performance of NFTyping.typeBindings: time 0.003909/0.8763, allocations: 1.01 MB / 1.156 GB, free: 6.836 MB / 0.698 GB Notification: Performance of NFTyping.typeClassSections: time 0.004917/0.8813, allocations: 1.377 MB / 1.157 GB, free: 5.91 MB / 0.698 GB Notification: Performance of NFFlatten.flatten: time 0.004028/0.8853, allocations: 2.648 MB / 1.16 GB, free: 4.32 MB / 0.698 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001705/0.887, allocations: 0.8989 MB / 1.161 GB, free: 3.75 MB / 0.698 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002501/0.8896, allocations: 1.019 MB / 1.162 GB, free: 3.191 MB / 0.698 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001674/0.8913, allocations: 0.8404 MB / 1.163 GB, free: 2.676 MB / 0.698 GB Notification: Performance of NFPackage.collectConstants: time 0.0004332/0.8917, allocations: 63.3 kB / 1.163 GB, free: 2.672 MB / 0.698 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002969/0.8947, allocations: 1.119 MB / 1.164 GB, free: 2.082 MB / 0.698 GB Notification: Performance of NFScalarize.scalarize: time 0.0007095/0.8954, allocations: 437.2 kB / 1.164 GB, free: 1.785 MB / 0.698 GB Notification: Performance of NFVerifyModel.verify: time 0.0006585/0.8961, allocations: 260.8 kB / 1.164 GB, free: 1.633 MB / 0.698 GB Notification: Performance of NFConvertDAE.convert: time 0.00266/0.8988, allocations: 1.668 MB / 1.166 GB, free: 0.5352 MB / 0.698 GB Notification: Performance of FrontEnd - DAE generated: time 6.051e-06/0.8988, allocations: 3.938 kB / 1.166 GB, free: 0.5312 MB / 0.698 GB Notification: Performance of FrontEnd: time 1.913e-06/0.8988, allocations: 0 / 1.166 GB, free: 0.5312 MB / 0.698 GB Notification: Performance of Transformations before backend: time 7.216e-05/0.8989, allocations: 1.625 kB / 1.166 GB, free: 0.5312 MB / 0.698 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 174 * Number of variables: 174 Notification: Performance of Generate backend data structure: time 0.005222/0.9041, allocations: 1.837 MB / 1.168 GB, free: 15.18 MB / 0.7136 GB Notification: Performance of prepare preOptimizeDAE: time 4.655e-05/0.9042, allocations: 9.656 kB / 1.168 GB, free: 15.18 MB / 0.7136 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002519/0.9044, allocations: 116.4 kB / 1.168 GB, free: 15.08 MB / 0.7136 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.001407/0.9058, allocations: 268.7 kB / 1.168 GB, free: 14.96 MB / 0.7136 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002589/0.9085, allocations: 1.327 MB / 1.17 GB, free: 14.04 MB / 0.7136 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 6.357e-05/0.9085, allocations: 69.47 kB / 1.17 GB, free: 14.01 MB / 0.7136 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001468/0.9087, allocations: 87.28 kB / 1.17 GB, free: 13.98 MB / 0.7136 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001805/0.9105, allocations: 1.017 MB / 1.171 GB, free: 13.34 MB / 0.7136 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.034e-05/0.9105, allocations: 4.938 kB / 1.171 GB, free: 13.34 MB / 0.7136 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 6.763e-05/0.9106, allocations: 35.94 kB / 1.171 GB, free: 13.31 MB / 0.7136 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.884e-05/0.9106, allocations: 17.72 kB / 1.171 GB, free: 13.31 MB / 0.7136 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002155/0.9128, allocations: 0.9448 MB / 1.172 GB, free: 12.92 MB / 0.7136 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 0.005633/0.9184, allocations: 4.354 MB / 1.176 GB, free: 9.203 MB / 0.7136 GB Notification: Performance of preOpt comSubExp (simulation): time 0.001544/0.92, allocations: 0.7991 MB / 1.177 GB, free: 8.855 MB / 0.7136 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.000837/0.9209, allocations: 447.2 kB / 1.177 GB, free: 8.676 MB / 0.7136 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0003767/0.9213, allocations: 282.1 kB / 1.177 GB, free: 8.375 MB / 0.7136 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.609e-05/0.9213, allocations: 41.06 kB / 1.177 GB, free: 8.332 MB / 0.7136 GB Notification: Performance of pre-optimization done (n=50): time 2.465e-06/0.9213, allocations: 0 / 1.177 GB, free: 8.332 MB / 0.7136 GB Notification: Performance of matching and sorting (n=50): time 0.005049/0.9264, allocations: 1.663 MB / 1.179 GB, free: 7.547 MB / 0.7136 GB Notification: Performance of inlineWhenForInitialization (initialization): time 3.639e-05/0.9264, allocations: 56.69 kB / 1.179 GB, free: 7.484 MB / 0.7136 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.003102/0.9295, allocations: 1.816 MB / 1.181 GB, free: 6.551 MB / 0.7136 GB Notification: Performance of collectPreVariables (initialization): time 0.0001323/0.9297, allocations: 43.14 kB / 1.181 GB, free: 6.508 MB / 0.7136 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004968/0.9302, allocations: 0.5868 MB / 1.181 GB, free: 5.992 MB / 0.7136 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001676/0.9304, allocations: 176.4 kB / 1.182 GB, free: 5.836 MB / 0.7136 GB Notification: Performance of simplifyInitialFunctions (initialization): time 4.455e-05/0.9304, allocations: 14.84 kB / 1.182 GB, free: 5.824 MB / 0.7136 GB Notification: Performance of setup shared object (initialization): time 0.0001218/0.9306, allocations: 344.8 kB / 1.182 GB, free: 5.492 MB / 0.7136 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001197/0.9318, allocations: 0.8313 MB / 1.183 GB, free: 5.168 MB / 0.7136 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001454/0.9332, allocations: 1.168 MB / 1.184 GB, free: 4.426 MB / 0.7136 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.002253/0.9355, allocations: 1.639 MB / 1.186 GB, free: 3.621 MB / 0.7136 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.37e-06/0.9355, allocations: 0 / 1.186 GB, free: 3.621 MB / 0.7136 GB Notification: Performance of matching and sorting (n=121) (initialization): time 0.003533/0.939, allocations: 2.122 MB / 1.188 GB, free: 2.719 MB / 0.7136 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001564/0.9392, allocations: 236 kB / 1.188 GB, free: 2.434 MB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.263e-05/0.9393, allocations: 5.5 kB / 1.188 GB, free: 2.434 MB / 0.7136 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0009331/0.9402, allocations: 144.4 kB / 1.188 GB, free: 2.367 MB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0008884/0.9411, allocations: 186.2 kB / 1.188 GB, free: 2.316 MB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001223/0.9423, allocations: 1.32 MB / 1.189 GB, free: 1.078 MB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002022/0.9444, allocations: 245.1 kB / 1.19 GB, free: 0.9453 MB / 0.7136 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.091e-05/0.9445, allocations: 32.61 kB / 1.19 GB, free: 0.9375 MB / 0.7136 GB Notification: Performance of prepare postOptimizeDAE: time 1.013e-05/0.9445, allocations: 2.812 kB / 1.19 GB, free: 0.9375 MB / 0.7136 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.002811/0.9473, allocations: 1.904 MB / 1.192 GB, free: 172 kB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.543e-05/0.9473, allocations: 5.625 kB / 1.192 GB, free: 172 kB / 0.7136 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.497e-05/0.9474, allocations: 11.56 kB / 1.192 GB, free: 168 kB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0008134/0.9482, allocations: 195.3 kB / 1.192 GB, free: 116 kB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.643e-05/0.9482, allocations: 11.98 kB / 1.192 GB, free: 112 kB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001853/0.9501, allocations: 213.6 kB / 1.192 GB, free: 15.99 MB / 0.7292 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.005e-05/0.9502, allocations: 32.58 kB / 1.192 GB, free: 15.98 MB / 0.7292 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 21 * Number of states: 0 () * Number of discrete variables: 14 (damPreInd.idx_sorted[1],damPreInd.idx_sorted[2],damPreInd.idx_sorted[3],damPreInd.idx_sorted[4],damPreInd.idx_sorted[5],damPreInd.idx_sorted[6],damPreInd.idx_sorted[7],damPreInd.idx_sorted[8],damPreInd.idx_sorted[9],damPreInd.idx_sorted[10],damPreInd.idx_sorted[11],damPreInd.idx_sorted[12],damPreInd.idx_sorted[13],conPID.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (74): * Single equations (assignments): 70 * Array equations: 1 * Algorithm blocks: 0 * Record equations: 1 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 1 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details: * Constant Jacobian: 0 * Linear Jacobian (size,density): 0 * Non-linear Jacobian: 1 {1} * Without analytic Jacobian: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {1 10} Notification: Performance of prepare postOptimizeDAE: time 0.0006776/0.9508, allocations: 388 kB / 1.192 GB, free: 15.69 MB / 0.7292 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0004534/0.9513, allocations: 131.6 kB / 1.193 GB, free: 15.61 MB / 0.7292 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.002427/0.9537, allocations: 1.067 MB / 1.194 GB, free: 15.04 MB / 0.7292 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 8.376e-06/0.9538, allocations: 4 kB / 1.194 GB, free: 15.03 MB / 0.7292 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 8.325e-06/0.9538, allocations: 3.938 kB / 1.194 GB, free: 15.03 MB / 0.7292 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 8.426e-06/0.9538, allocations: 3.984 kB / 1.194 GB, free: 15.02 MB / 0.7292 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004852/0.9587, allocations: 2.304 MB / 1.196 GB, free: 12.64 MB / 0.7292 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.572e-06/0.9587, allocations: 4 kB / 1.196 GB, free: 12.63 MB / 0.7292 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0006233/0.9593, allocations: 140 kB / 1.196 GB, free: 12.5 MB / 0.7292 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0007321/0.9601, allocations: 140.7 kB / 1.196 GB, free: 12.36 MB / 0.7292 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.299e-05/0.9601, allocations: 19.98 kB / 1.196 GB, free: 12.34 MB / 0.7292 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0009819/0.9611, allocations: 1.31 MB / 1.197 GB, free: 10.98 MB / 0.7292 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 5.811e-06/0.9611, allocations: 7.969 kB / 1.197 GB, free: 10.97 MB / 0.7292 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.003187/0.9643, allocations: 1.673 MB / 1.199 GB, free: 9.25 MB / 0.7292 GB Notification: Performance of postOpt removeConstants (simulation): time 0.000777/0.9651, allocations: 311.2 kB / 1.199 GB, free: 8.926 MB / 0.7292 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000393/0.9655, allocations: 19.92 kB / 1.199 GB, free: 8.906 MB / 0.7292 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001296/0.9668, allocations: 103.9 kB / 1.199 GB, free: 8.805 MB / 0.7292 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.000114/0.967, allocations: 49.75 kB / 1.199 GB, free: 8.758 MB / 0.7292 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 4.972e-05/0.967, allocations: 19.98 kB / 1.2 GB, free: 8.738 MB / 0.7292 GB Notification: Performance of sorting global known variables: time 0.001932/0.969, allocations: 1.297 MB / 1.201 GB, free: 7.441 MB / 0.7292 GB Notification: Performance of sort global known variables: time 1.71e-07/0.969, allocations: 3.938 kB / 1.201 GB, free: 7.438 MB / 0.7292 GB Notification: Performance of remove unused functions: time 0.00186/0.9708, allocations: 0.6201 MB / 1.201 GB, free: 6.816 MB / 0.7292 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * Number of states: 2 (conPID.I.y,conPID.D.x) * 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 (44): * Single equations (assignments): 42 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 1 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details: * Constant Jacobian: 0 * Linear Jacobian (size,density): 0 * Non-linear Jacobian: 1 {1} * Without analytic Jacobian: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {1 11} Notification: Performance of Backend phase and start with SimCode phase: time 0.004134/0.975, allocations: 2.47 MB / 1.204 GB, free: 4.297 MB / 0.7292 GB Notification: Performance of simCode: created initialization part: time 0.004454/0.9794, allocations: 2.561 MB / 1.206 GB, free: 1.723 MB / 0.7292 GB Notification: Performance of simCode: created event and clocks part: time 5.28e-06/0.9795, allocations: 0 / 1.206 GB, free: 1.723 MB / 0.7292 GB Notification: Performance of simCode: created simulation system equations: time 0.001067/0.9806, allocations: 470.7 kB / 1.207 GB, free: 1.266 MB / 0.7292 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003352/0.9839, allocations: 448.9 kB / 1.207 GB, free: 0.832 MB / 0.7292 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.0187/1.003, allocations: 11.31 MB / 1.218 GB, free: 5.148 MB / 0.7448 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007831/1.003, allocations: 1.165 MB / 1.219 GB, free: 3.957 MB / 0.7448 GB Notification: Performance of simCode: alias equations: time 0.001605/1.005, allocations: 297 kB / 1.22 GB, free: 3.668 MB / 0.7448 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0007279/1.006, allocations: 0.4914 MB / 1.22 GB, free: 3.176 MB / 0.7448 GB Notification: Performance of SimCode: time 8.42e-07/1.006, allocations: 0 / 1.22 GB, free: 3.176 MB / 0.7448 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.06213/1.068, allocations: 35.81 MB / 1.255 GB, free: 15.8 MB / 0.7917 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0002418/1.068, allocations: 260.6 kB / 1.255 GB, free: 15.45 MB / 0.7917 GB Notification: Performance of buildModelFMU: Generate platform static: time 3.359/4.427, allocations: 0 / 1.255 GB, free: 15.45 MB / 0.7917 GB (rm -f Buildings_8.0.0_Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent.pipe ; mkfifo Buildings_8.0.0_Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent.pipe ; head -c 1048576 < Buildings_8.0.0_Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent.pipe >> ../files/Buildings_8.0.0_Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator --tempDir=temp_Buildings_8_0_0_Buildings_Fluid_Actuators_Dampers_Validation_PressureIndependent_fmu --startTime=0 --stopTime=1 --timeout=50 --tolerance=1e-06 Buildings_8_0_0_Buildings_Fluid_Actuators_Dampers_Validation_PressureIndependent.fmu > Buildings_8.0.0_Buildings.Fluid.Actuators.Dampers.Validation.PressureIndependent.pipe 2>&1)