Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u.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/Buildings 11.1.0-maint.11.x/package.mo", uses=false) Using package Buildings with version 11.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.1.0-maint.11.x/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(Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u,fileNamePrefix="Buildings_11_Buildings_Fluid_HeatExchangers_Examples_WaterHeater_u",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u,fileNamePrefix="Buildings_11_Buildings_Fluid_HeatExchangers_Examples_WaterHeater_u",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 0.001722/0.001722, allocations: 108 kB / 15.6 MB, free: 132 kB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.002082/0.002082, allocations: 197 kB / 16.54 MB, free: 6.672 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.398/1.398, allocations: 222.9 MB / 240.2 MB, free: 4.395 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.1.0-maint.11.x/package.mo): time 2.468/2.468, allocations: 469.8 MB / 0.7424 GB, free: 7.434 MB / 0.5919 GB Notification: Performance of FrontEnd - loaded program: time 0.003357/0.003357, allocations: 71.39 kB / 0.9087 GB, free: 34.35 MB / 0.7169 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2414/0.2448, allocations: 159.2 MB / 1.064 GB, free: 14.21 MB / 0.8262 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u): time 0.0655/0.3104, allocations: 67.46 MB / 1.13 GB, free: 10.52 MB / 0.8887 GB Notification: Performance of NFInst.instExpressions: time 0.02514/0.3355, allocations: 18.59 MB / 1.148 GB, free: 7.879 MB / 0.9044 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00211/0.3377, allocations: 95.5 kB / 1.148 GB, free: 7.785 MB / 0.9044 GB Notification: Performance of NFTyping.typeComponents: time 0.007536/0.3453, allocations: 4.412 MB / 1.153 GB, free: 3.363 MB / 0.9044 GB Notification: Performance of NFTyping.typeBindings: time 0.005691/0.351, allocations: 2.718 MB / 1.155 GB, free: 0.6328 MB / 0.9044 GB Notification: Performance of NFTyping.typeClassSections: time 0.004754/0.3557, allocations: 2.367 MB / 1.157 GB, free: 14.28 MB / 0.92 GB Notification: Performance of NFFlatten.flatten: time 0.009653/0.3654, allocations: 8.15 MB / 1.165 GB, free: 6.113 MB / 0.92 GB Notification: Performance of NFFlatten.resolveConnections: time 0.002355/0.3678, allocations: 1.919 MB / 1.167 GB, free: 4.141 MB / 0.92 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003591/0.3714, allocations: 2.061 MB / 1.169 GB, free: 2.078 MB / 0.92 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001671/0.373, allocations: 1.532 MB / 1.171 GB, free: 0.5391 MB / 0.92 GB Notification: Performance of NFPackage.collectConstants: time 0.0002875/0.3733, allocations: 192 kB / 1.171 GB, free: 360 kB / 0.92 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003611/0.377, allocations: 2.141 MB / 1.173 GB, free: 14.21 MB / 0.9356 GB Notification: Performance of NFScalarize.scalarize: time 0.0006212/0.3776, allocations: 0.6891 MB / 1.174 GB, free: 13.52 MB / 0.9356 GB Notification: Performance of NFVerifyModel.verify: time 0.001254/0.3788, allocations: 1.318 MB / 1.175 GB, free: 12.19 MB / 0.9356 GB Notification: Performance of NFConvertDAE.convert: time 0.004577/0.3834, allocations: 4.152 MB / 1.179 GB, free: 8.027 MB / 0.9356 GB Notification: Performance of FrontEnd - DAE generated: time 2.715e-06/0.3834, allocations: 0 / 1.179 GB, free: 8.027 MB / 0.9356 GB Notification: Performance of FrontEnd: time 1.072e-06/0.3835, allocations: 4 kB / 1.179 GB, free: 8.023 MB / 0.9356 GB Notification: Performance of Transformations before backend: time 2.143e-05/0.3835, allocations: 0 / 1.179 GB, free: 8.023 MB / 0.9356 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 314 * Number of variables: 314 Notification: Performance of Generate backend data structure: time 0.004449/0.3879, allocations: 3.072 MB / 1.182 GB, free: 4.867 MB / 0.9356 GB Notification: Performance of prepare preOptimizeDAE: time 3.554e-05/0.388, allocations: 12.03 kB / 1.182 GB, free: 4.855 MB / 0.9356 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0002218/0.3882, allocations: 193.8 kB / 1.182 GB, free: 4.656 MB / 0.9356 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.00181/0.39, allocations: 480.4 kB / 1.183 GB, free: 4.184 MB / 0.9356 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.004087/0.3941, allocations: 2.747 MB / 1.185 GB, free: 1.363 MB / 0.9356 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0003989/0.3945, allocations: 162.5 kB / 1.186 GB, free: 1.203 MB / 0.9356 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001958/0.3947, allocations: 143.9 kB / 1.186 GB, free: 1.062 MB / 0.9356 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002523/0.3973, allocations: 1.448 MB / 1.187 GB, free: 15.52 MB / 0.9512 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.462e-05/0.3973, allocations: 0 / 1.187 GB, free: 15.52 MB / 0.9512 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.000113/0.3974, allocations: 52 kB / 1.187 GB, free: 15.47 MB / 0.9512 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.71e-05/0.3975, allocations: 54.25 kB / 1.187 GB, free: 15.41 MB / 0.9512 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002511/0.4, allocations: 1.133 MB / 1.188 GB, free: 14.27 MB / 0.9512 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 0.00935/0.4093, allocations: 7.785 MB / 1.196 GB, free: 5.914 MB / 0.9512 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002185/0.4115, allocations: 1.296 MB / 1.197 GB, free: 4.504 MB / 0.9512 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0009965/0.4125, allocations: 463.8 kB / 1.198 GB, free: 4.051 MB / 0.9512 GB Notification: Performance of preOpt evalFunc (simulation): time 0.004345/0.4169, allocations: 2.704 MB / 1.2 GB, free: 1.117 MB / 0.9512 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001024/0.4179, allocations: 482.5 kB / 1.201 GB, free: 0.625 MB / 0.9512 GB Notification: Performance of pre-optimization done (n=62): time 3.547e-06/0.418, allocations: 3.984 kB / 1.201 GB, free: 0.6211 MB / 0.9512 GB Notification: Performance of matching and sorting (n=62): time 0.003007/0.421, allocations: 1.268 MB / 1.202 GB, free: 15.32 MB / 0.9669 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.083e-05/0.421, allocations: 115.4 kB / 1.202 GB, free: 15.19 MB / 0.9669 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002462/0.4235, allocations: 2.052 MB / 1.204 GB, free: 13.11 MB / 0.9669 GB Notification: Performance of collectPreVariables (initialization): time 7.248e-05/0.4236, allocations: 49.7 kB / 1.204 GB, free: 13.05 MB / 0.9669 GB Notification: Performance of collectInitialEqns (initialization): time 0.0008834/0.4245, allocations: 1.034 MB / 1.205 GB, free: 12.01 MB / 0.9669 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002029/0.4247, allocations: 224.8 kB / 1.205 GB, free: 11.79 MB / 0.9669 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003985/0.4251, allocations: 314.5 kB / 1.206 GB, free: 11.48 MB / 0.9669 GB Notification: Performance of setup shared object (initialization): time 0.0001193/0.4252, allocations: 309.1 kB / 1.206 GB, free: 11.17 MB / 0.9669 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001116/0.4264, allocations: 0.5493 MB / 1.207 GB, free: 10.62 MB / 0.9669 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001469/0.4278, allocations: 0.9736 MB / 1.207 GB, free: 9.465 MB / 0.9669 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.00238/0.4302, allocations: 1.442 MB / 1.209 GB, free: 7.867 MB / 0.9669 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.21e-06/0.4302, allocations: 0 / 1.209 GB, free: 7.867 MB / 0.9669 GB Notification: Performance of matching and sorting (n=188) (initialization): time 0.003108/0.4333, allocations: 1.769 MB / 1.211 GB, free: 6.082 MB / 0.9669 GB Notification: Performance of prepare postOptimizeDAE: time 3.707e-05/0.4334, allocations: 37.7 kB / 1.211 GB, free: 6.039 MB / 0.9669 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.698e-05/0.4334, allocations: 12 kB / 1.211 GB, free: 6.027 MB / 0.9669 GB Notification: Performance of postOpt tearingSystem (initialization): time 2.496e-05/0.4334, allocations: 16 kB / 1.211 GB, free: 6.012 MB / 0.9669 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001045/0.4345, allocations: 307.6 kB / 1.211 GB, free: 5.711 MB / 0.9669 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 2.476e-05/0.4345, allocations: 23.92 kB / 1.211 GB, free: 5.688 MB / 0.9669 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001069/0.4356, allocations: 184.7 kB / 1.211 GB, free: 5.508 MB / 0.9669 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001039/0.4357, allocations: 59.98 kB / 1.211 GB, free: 5.449 MB / 0.9669 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.001648/0.4374, allocations: 0.9834 MB / 1.212 GB, free: 4.465 MB / 0.9669 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.001456/0.4388, allocations: 0.9813 MB / 1.213 GB, free: 3.312 MB / 0.9669 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.002359/0.4412, allocations: 1.438 MB / 1.215 GB, free: 1.723 MB / 0.9669 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.821e-06/0.4412, allocations: 8 kB / 1.215 GB, free: 1.715 MB / 0.9669 GB Notification: Performance of matching and sorting (n=188) (initialization_lambda0): time 0.003096/0.4443, allocations: 1.756 MB / 1.216 GB, free: 15.94 MB / 0.9825 GB Notification: Performance of prepare postOptimizeDAE: time 3.039e-05/0.4444, allocations: 38.36 kB / 1.216 GB, free: 15.9 MB / 0.9825 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.168e-05/0.4444, allocations: 12 kB / 1.216 GB, free: 15.89 MB / 0.9825 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.677e-05/0.4444, allocations: 20 kB / 1.216 GB, free: 15.87 MB / 0.9825 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001023/0.4454, allocations: 303.5 kB / 1.217 GB, free: 15.57 MB / 0.9825 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 2.026e-05/0.4455, allocations: 23.92 kB / 1.217 GB, free: 15.55 MB / 0.9825 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001068/0.4465, allocations: 159.4 kB / 1.217 GB, free: 15.39 MB / 0.9825 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 9.852e-05/0.4466, allocations: 63.98 kB / 1.217 GB, free: 15.33 MB / 0.9825 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 49 * Number of states: 0 () * Number of discrete variables: 6 (TSet.count,$PRE.TSet.count,TSet.T_start,$PRE.TSet.T_start,$whenCondition1,conPI.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (154): * Single equations (assignments): 151 * Array equations: 1 * Algorithm blocks: 1 * Record equations: 1 * 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 0.0002427/0.4469, allocations: 252.4 kB / 1.217 GB, free: 15.07 MB / 0.9825 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002712/0.4472, allocations: 205.3 kB / 1.217 GB, free: 14.87 MB / 0.9825 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.002443/0.4496, allocations: 1.096 MB / 1.218 GB, free: 13.77 MB / 0.9825 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.393e-05/0.4496, allocations: 12.08 kB / 1.218 GB, free: 13.75 MB / 0.9825 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.674e-05/0.4497, allocations: 7.984 kB / 1.218 GB, free: 13.75 MB / 0.9825 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001821/0.4515, allocations: 0.7842 MB / 1.219 GB, free: 12.95 MB / 0.9825 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004705/0.4562, allocations: 2.896 MB / 1.222 GB, free: 9.957 MB / 0.9825 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.173e-06/0.4562, allocations: 4 kB / 1.222 GB, free: 9.953 MB / 0.9825 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0007236/0.457, allocations: 160 kB / 1.222 GB, free: 9.797 MB / 0.9825 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0001309/0.4571, allocations: 28.84 kB / 1.222 GB, free: 9.766 MB / 0.9825 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 4.873e-05/0.4572, allocations: 27.98 kB / 1.222 GB, free: 9.738 MB / 0.9825 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001121/0.4583, allocations: 1.421 MB / 1.224 GB, free: 8.176 MB / 0.9825 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.477e-06/0.4583, allocations: 3.938 kB / 1.224 GB, free: 8.172 MB / 0.9825 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.003191/0.4615, allocations: 1.618 MB / 1.225 GB, free: 6.516 MB / 0.9825 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005515/0.4621, allocations: 402.1 kB / 1.226 GB, free: 6.102 MB / 0.9825 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002212/0.4623, allocations: 31.92 kB / 1.226 GB, free: 6.07 MB / 0.9825 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0009027/0.4632, allocations: 63.94 kB / 1.226 GB, free: 6.008 MB / 0.9825 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001108/0.4633, allocations: 60.42 kB / 1.226 GB, free: 5.949 MB / 0.9825 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.732e-05/0.4634, allocations: 35.97 kB / 1.226 GB, free: 5.914 MB / 0.9825 GB Notification: Performance of sorting global known variables: time 0.001851/0.4652, allocations: 1.442 MB / 1.227 GB, free: 4.461 MB / 0.9825 GB Notification: Performance of sort global known variables: time 1.6e-07/0.4653, allocations: 3.938 kB / 1.227 GB, free: 4.457 MB / 0.9825 GB Notification: Performance of remove unused functions: time 0.002349/0.4676, allocations: 1.107 MB / 1.228 GB, free: 3.348 MB / 0.9825 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * Number of states: 6 (vol.dynBal.U,mov.filter.s[1],mov.filter.s[2],conPI.I.y,THeaOut.T,hea.vol.dynBal.U) * Number of discrete variables: 3 ($whenCondition1,TSet.T_start,TSet.count) * Number of discrete states: 1 (TSet.count) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (74): * Single equations (assignments): 66 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 5 * 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): 1 system {(1,1,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of Backend phase and start with SimCode phase: time 0.00468/0.4723, allocations: 2.749 MB / 1.231 GB, free: 0.5547 MB / 0.9825 GB Notification: Performance of simCode: created initialization part: time 0.004167/0.4765, allocations: 2.167 MB / 1.233 GB, free: 14.36 MB / 0.9981 GB Notification: Performance of simCode: created event and clocks part: time 4.258e-06/0.4765, allocations: 4 kB / 1.233 GB, free: 14.36 MB / 0.9981 GB Notification: Performance of simCode: created simulation system equations: time 0.001153/0.4776, allocations: 0.5543 MB / 1.234 GB, free: 13.79 MB / 0.9981 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003833/0.4815, allocations: 1.092 MB / 1.235 GB, free: 12.73 MB / 0.9981 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.3905/0.872, allocations: 16.46 MB / 1.251 GB, free: 172.3 MB / 0.9981 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0009339/0.8729, allocations: 1.577 MB / 1.252 GB, free: 171.6 MB / 0.9981 GB Notification: Performance of simCode: alias equations: time 0.001887/0.8748, allocations: 0.5293 MB / 1.253 GB, free: 171.5 MB / 0.9981 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000854/0.8757, allocations: 0.8961 MB / 1.254 GB, free: 171.5 MB / 0.9981 GB Notification: Performance of SimCode: time 5.21e-07/0.8757, allocations: 0 / 1.254 GB, free: 171.5 MB / 0.9981 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.8925/1.768, allocations: 59.09 MB / 1.311 GB, free: 142.9 MB / 0.9981 GB Notification: Performance of buildModelFMU: Generate platform static: time 13.28/15.05, allocations: 11.67 kB / 1.311 GB, free: 142.9 MB / 0.9981 GB (rm -f Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u.pipe ; mkfifo Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u.pipe ; head -c 1048576 < Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u.pipe >> ../files/Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator -r=Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u_res.mat --tempDir=temp_Buildings_11_Buildings_Fluid_HeatExchangers_Examples_WaterHeater_u_fmu --startTime=0 --stopTime=172800 --timeout=400 --tolerance=1e-06 Buildings_11_Buildings_Fluid_HeatExchangers_Examples_WaterHeater_u.fmu > Buildings_11_Buildings.Fluid.HeatExchangers.Examples.WaterHeater_u.pipe 2>&1)