Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed.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.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_HeatPumps_Validation_ReciprocatingWaterToWater_VariableSpeed",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed,fileNamePrefix="IBPSA_latest_IBPSA_Fluid_HeatPumps_Validation_ReciprocatingWaterToWater_VariableSpeed",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 0.0008664/0.0008665, allocations: 98.66 kB / 16.02 MB, free: 80 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.0007778/0.0007778, allocations: 183.7 kB / 16.92 MB, free: 6.754 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.24/1.24, allocations: 223.3 MB / 241 MB, free: 5.34 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/IBPSA 4.0.0-master/package.mo): time 0.639/0.639, allocations: 115.5 MB / 407.6 MB, free: 2.699 MB / 334.1 MB Notification: Performance of FrontEnd - loaded program: time 0.0002986/0.0002986, allocations: 12 kB / 496 MB, free: 6.258 MB / 350.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1236/0.1239, allocations: 77.53 MB / 0.56 GB, free: 8.93 MB / 430.1 MB Notification: Performance of NFInst.instantiate(IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed): time 0.2836/0.4076, allocations: 68.24 MB / 0.6267 GB, free: 9.488 MB / 462.1 MB Notification: Performance of NFInst.instExpressions: time 0.0188/0.4264, allocations: 14.52 MB / 0.6409 GB, free: 14.88 MB / 478.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.002137/0.4286, allocations: 66.25 kB / 0.6409 GB, free: 14.85 MB / 478.1 MB Notification: Performance of NFTyping.typeComponents: time 0.002102/0.4307, allocations: 0.7466 MB / 0.6417 GB, free: 14.22 MB / 478.1 MB Notification: Performance of NFTyping.typeBindings: time 0.005986/0.4367, allocations: 2.356 MB / 0.644 GB, free: 12.34 MB / 478.1 MB Notification: Performance of NFTyping.typeClassSections: time 0.004264/0.441, allocations: 1.797 MB / 0.6457 GB, free: 11 MB / 478.1 MB Notification: Performance of NFFlatten.flatten: time 0.006008/0.447, allocations: 5.945 MB / 0.6515 GB, free: 7.695 MB / 478.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.001803/0.4488, allocations: 1.297 MB / 0.6528 GB, free: 6.887 MB / 478.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.002696/0.4515, allocations: 1.444 MB / 0.6542 GB, free: 6.094 MB / 478.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.001743/0.4533, allocations: 1.201 MB / 0.6554 GB, free: 5.129 MB / 478.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0002552/0.4535, allocations: 72 kB / 0.6554 GB, free: 5.059 MB / 478.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.003776/0.4573, allocations: 1.735 MB / 0.6571 GB, free: 3.32 MB / 478.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0004553/0.4578, allocations: 334.5 kB / 0.6574 GB, free: 2.992 MB / 478.1 MB Notification: Performance of NFVerifyModel.verify: time 0.001245/0.459, allocations: 0.9112 MB / 0.6583 GB, free: 2.07 MB / 478.1 MB Notification: Performance of NFConvertDAE.convert: time 0.004231/0.4633, allocations: 3.388 MB / 0.6616 GB, free: 14.67 MB / 494.1 MB Notification: Performance of FrontEnd - DAE generated: time 4.007e-06/0.4633, allocations: 0 / 0.6616 GB, free: 14.67 MB / 494.1 MB Notification: Performance of FrontEnd: time 1.522e-06/0.4633, allocations: 0 / 0.6616 GB, free: 14.67 MB / 494.1 MB Notification: Performance of Transformations before backend: time 1.636e-05/0.4633, allocations: 0 / 0.6616 GB, free: 14.67 MB / 494.1 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 296 * Number of variables: 296 Notification: Performance of Generate backend data structure: time 0.003275/0.4666, allocations: 1.996 MB / 0.6636 GB, free: 12.61 MB / 494.1 MB Notification: Performance of prepare preOptimizeDAE: time 3.634e-05/0.4666, allocations: 8.031 kB / 0.6636 GB, free: 12.6 MB / 494.1 MB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002133/0.4669, allocations: 177.6 kB / 0.6638 GB, free: 12.41 MB / 494.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004777/0.4716, allocations: 0.6895 MB / 0.6644 GB, free: 11.72 MB / 494.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002202/0.4739, allocations: 1.565 MB / 0.666 GB, free: 10.1 MB / 494.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001144/0.474, allocations: 136 kB / 0.6661 GB, free: 9.961 MB / 494.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001956/0.4742, allocations: 131.8 kB / 0.6662 GB, free: 9.832 MB / 494.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003604/0.4778, allocations: 1.66 MB / 0.6678 GB, free: 8.082 MB / 494.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 2.682e-05/0.4778, allocations: 3.938 kB / 0.6679 GB, free: 8.078 MB / 494.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.000134/0.478, allocations: 52 kB / 0.6679 GB, free: 8.027 MB / 494.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 3.653e-05/0.478, allocations: 32 kB / 0.6679 GB, free: 7.996 MB / 494.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.004456/0.4825, allocations: 1.503 MB / 0.6694 GB, free: 6.484 MB / 494.1 MB 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 0.008886/0.4914, allocations: 6.997 MB / 0.6762 GB, free: 15.14 MB / 0.4981 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002214/0.4936, allocations: 0.7802 MB / 0.677 GB, free: 14.36 MB / 0.4981 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001584/0.4952, allocations: 0.5061 MB / 0.6775 GB, free: 13.85 MB / 0.4981 GB Notification: Performance of preOpt evalFunc (simulation): time 0.00119/0.4964, allocations: 1.274 MB / 0.6787 GB, free: 12.3 MB / 0.4981 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001879/0.4983, allocations: 0.6675 MB / 0.6794 GB, free: 11.59 MB / 0.4981 GB Notification: Performance of pre-optimization done (n=69): time 2.295e-06/0.4983, allocations: 0 / 0.6794 GB, free: 11.59 MB / 0.4981 GB Notification: Performance of matching and sorting (n=69): time 0.01007/0.5084, allocations: 2.178 MB / 0.6815 GB, free: 9.387 MB / 0.4981 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001323/0.5086, allocations: 321 kB / 0.6818 GB, free: 9 MB / 0.4981 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.00221/0.5108, allocations: 1.391 MB / 0.6832 GB, free: 7.598 MB / 0.4981 GB Notification: Performance of collectPreVariables (initialization): time 0.0001377/0.5109, allocations: 45.7 kB / 0.6832 GB, free: 7.547 MB / 0.4981 GB Notification: Performance of collectInitialEqns (initialization): time 0.0006404/0.5116, allocations: 0.7075 MB / 0.6839 GB, free: 6.832 MB / 0.4981 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002538/0.5118, allocations: 236.6 kB / 0.6841 GB, free: 6.598 MB / 0.4981 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001469/0.512, allocations: 85.67 kB / 0.6842 GB, free: 6.508 MB / 0.4981 GB Notification: Performance of setup shared object (initialization): time 0.0001152/0.5121, allocations: 345.9 kB / 0.6845 GB, free: 6.164 MB / 0.4981 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.00199/0.5141, allocations: 0.5249 MB / 0.6851 GB, free: 5.637 MB / 0.4981 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.002143/0.5163, allocations: 0.8374 MB / 0.6859 GB, free: 4.676 MB / 0.4981 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.003658/0.5199, allocations: 1.213 MB / 0.6871 GB, free: 3.371 MB / 0.4981 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.601e-06/0.52, allocations: 0 / 0.6871 GB, free: 3.371 MB / 0.4981 GB Notification: Performance of matching and sorting (n=117) (initialization): time 0.006379/0.5263, allocations: 1.692 MB / 0.6887 GB, free: 1.66 MB / 0.4981 GB Notification: Performance of prepare postOptimizeDAE: time 0.0001879/0.5265, allocations: 304.3 kB / 0.689 GB, free: 1.273 MB / 0.4981 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.394e-05/0.5266, allocations: 15.94 kB / 0.689 GB, free: 1.258 MB / 0.4981 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001356/0.5279, allocations: 372.4 kB / 0.6894 GB, free: 0.8945 MB / 0.4981 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001441/0.5294, allocations: 283.5 kB / 0.6896 GB, free: 0.6172 MB / 0.4981 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001213/0.5306, allocations: 0.9054 MB / 0.6905 GB, free: 15.69 MB / 0.5137 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002456/0.5331, allocations: 287.3 kB / 0.6908 GB, free: 15.41 MB / 0.5137 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001233/0.5332, allocations: 59.94 kB / 0.6909 GB, free: 15.35 MB / 0.5137 GB Notification: Performance of prepare postOptimizeDAE: time 7.624e-06/0.5332, allocations: 0 / 0.6909 GB, free: 15.35 MB / 0.5137 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.006013/0.5393, allocations: 1.532 MB / 0.6924 GB, free: 13.8 MB / 0.5137 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.13e-05/0.5393, allocations: 4 kB / 0.6924 GB, free: 13.8 MB / 0.5137 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001231/0.5405, allocations: 374.6 kB / 0.6927 GB, free: 13.44 MB / 0.5137 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001424/0.542, allocations: 275.8 kB / 0.693 GB, free: 13.17 MB / 0.5137 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001131/0.5431, allocations: 0.9057 MB / 0.6939 GB, free: 12.24 MB / 0.5137 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002257/0.5454, allocations: 262.8 kB / 0.6941 GB, free: 11.98 MB / 0.5137 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001616/0.5455, allocations: 55.95 kB / 0.6942 GB, free: 11.93 MB / 0.5137 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 28 * Number of states: 0 () * Number of discrete variables: 7 (N.count,$PRE.N.count,N.T_start,$PRE.N.T_start,heaPum.com.isOn,$PRE.heaPum.com.isOn,$whenCondition1) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (98): * Single equations (assignments): 96 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 0 systems * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(2,17)} Notification: Performance of prepare postOptimizeDAE: time 0.0008302/0.5464, allocations: 464.7 kB / 0.6946 GB, free: 11.46 MB / 0.5137 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0003838/0.5468, allocations: 154.2 kB / 0.6948 GB, free: 11.31 MB / 0.5137 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004144/0.5509, allocations: 1.266 MB / 0.696 GB, free: 10.03 MB / 0.5137 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.722e-05/0.551, allocations: 12 kB / 0.696 GB, free: 10.02 MB / 0.5137 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.833e-06/0.551, allocations: 0 / 0.696 GB, free: 10.02 MB / 0.5137 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.003439/0.5544, allocations: 1.092 MB / 0.6971 GB, free: 8.891 MB / 0.5137 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.007644/0.5621, allocations: 3.334 MB / 0.7003 GB, free: 5.434 MB / 0.5137 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.531e-05/0.5621, allocations: 11.98 kB / 0.7003 GB, free: 5.422 MB / 0.5137 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0009837/0.5631, allocations: 164.1 kB / 0.7005 GB, free: 5.262 MB / 0.5137 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.001242/0.5644, allocations: 366 kB / 0.7008 GB, free: 4.906 MB / 0.5137 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 8.186e-05/0.5645, allocations: 27.91 kB / 0.7009 GB, free: 4.879 MB / 0.5137 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001201/0.5657, allocations: 0.8978 MB / 0.7018 GB, free: 3.957 MB / 0.5137 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 8.806e-06/0.5657, allocations: 7.938 kB / 0.7018 GB, free: 3.949 MB / 0.5137 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.005856/0.5716, allocations: 1.976 MB / 0.7037 GB, free: 1.895 MB / 0.5137 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0008544/0.5725, allocations: 394.9 kB / 0.7041 GB, free: 1.488 MB / 0.5137 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0003714/0.5728, allocations: 27.98 kB / 0.7041 GB, free: 1.461 MB / 0.5137 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001918/0.5748, allocations: 155.8 kB / 0.7042 GB, free: 1.309 MB / 0.5137 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001489/0.5749, allocations: 64.23 kB / 0.7043 GB, free: 1.246 MB / 0.5137 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 9.657e-05/0.575, allocations: 43.95 kB / 0.7043 GB, free: 1.203 MB / 0.5137 GB Notification: Performance of sorting global known variables: time 0.001735/0.5768, allocations: 0.9901 MB / 0.7053 GB, free: 220 kB / 0.5137 GB Notification: Performance of sort global known variables: time 1.9e-07/0.5768, allocations: 4 kB / 0.7053 GB, free: 216 kB / 0.5137 GB Notification: Performance of remove unused functions: time 0.002742/0.5795, allocations: 0.9007 MB / 0.7062 GB, free: 15.31 MB / 0.5294 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 19 * Number of states: 2 (heaPum.con.vol.dynBal.U,heaPum.eva.vol.dynBal.U) * Number of discrete variables: 4 ($whenCondition1,heaPum.com.isOn,N.T_start,N.count) * Number of discrete states: 2 (N.count,heaPum.com.isOn) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (51): * Single equations (assignments): 46 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 2 * When equations: 2 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 0 systems * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(2,17)} Notification: Performance of Backend phase and start with SimCode phase: time 0.007107/0.5867, allocations: 2.959 MB / 0.7091 GB, free: 12.28 MB / 0.5294 GB Notification: Performance of simCode: created initialization part: time 0.006477/0.5932, allocations: 2.019 MB / 0.7111 GB, free: 10.23 MB / 0.5294 GB Notification: Performance of simCode: created event and clocks part: time 8.546e-06/0.5932, allocations: 4 kB / 0.7111 GB, free: 10.23 MB / 0.5294 GB Notification: Performance of simCode: created simulation system equations: time 0.00192/0.5951, allocations: 0.576 MB / 0.7116 GB, free: 9.652 MB / 0.5294 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.00496/0.6001, allocations: 0.8105 MB / 0.7124 GB, free: 8.859 MB / 0.5294 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.03176/0.6319, allocations: 13.8 MB / 0.7259 GB, free: 10.4 MB / 0.545 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007975/0.6327, allocations: 1.219 MB / 0.7271 GB, free: 9.148 MB / 0.545 GB Notification: Performance of simCode: alias equations: time 0.001825/0.6345, allocations: 380.4 kB / 0.7274 GB, free: 8.785 MB / 0.545 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0008494/0.6354, allocations: 0.5851 MB / 0.728 GB, free: 8.199 MB / 0.545 GB Notification: Performance of SimCode: time 7.82e-07/0.6354, allocations: 0 / 0.728 GB, free: 8.199 MB / 0.545 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.07673/0.7121, allocations: 50.67 MB / 0.7775 GB, free: 6.184 MB / 0.5919 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0002102/0.7124, allocations: 300.4 kB / 0.7778 GB, free: 5.805 MB / 0.5919 GB Notification: Performance of buildModelFMU: Generate platform static: time 2.903/3.615, allocations: 3.625 kB / 0.7778 GB, free: 5.805 MB / 0.5919 GB (rm -f IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed.pipe ; mkfifo IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed.pipe ; head -c 1048576 < IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed.pipe >> ../files/IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator --tempDir=temp_IBPSA_latest_IBPSA_Fluid_HeatPumps_Validation_ReciprocatingWaterToWater_VariableSpeed_fmu --startTime=0 --stopTime=2000 --timeout=50 --tolerance=1e-06 IBPSA_latest_IBPSA_Fluid_HeatPumps_Validation_ReciprocatingWaterToWater_VariableSpeed.fmu > IBPSA_latest_IBPSA.Fluid.HeatPumps.Validation.ReciprocatingWaterToWater_VariableSpeed.pipe 2>&1)