Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.conf.json
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/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 7.0.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo)
Running command: translateModel(Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir")
translateModel(Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir")
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo): time 1.388/1.388, allocations: 252 MB / 268 MB, free: 10.86 MB / 218.7 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.001005/0.001005, allocations: 174.6 kB / 327.6 MB, free: 2.117 MB / 250.7 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.778/1.778, allocations: 205.4 MB / 0.5786 GB, free: 20.13 MB / 426.7 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.0009099/0.0009099, allocations: 78.44 kB / 0.6832 GB, free: 12.77 MB / 0.5105 GB
Notification: Performance of FrontEnd - loaded program: time 0.0003363/0.0003364, allocations: 13.97 kB / 0.7976 GB, free: 135.2 MB / 0.6042 GB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.238/0.2384, allocations: 106.3 MB / 0.9014 GB, free: 63.55 MB / 0.6042 GB
Notification: Performance of NFInst.instantiate(Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir): time 0.6972/0.9357, allocations: 178.7 MB / 1.076 GB, free: 1.754 MB / 0.698 GB
Notification: Performance of NFInst.instExpressions: time 0.01139/0.9471, allocations: 6.725 MB / 1.083 GB, free: 1.594 MB / 0.698 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.001692/0.9488, allocations: 24.84 kB / 1.083 GB, free: 1.594 MB / 0.698 GB
Notification: Performance of NFTyping.typeComponents: time 0.001627/0.9505, allocations: 370 kB / 1.083 GB, free: 1.59 MB / 0.698 GB
Notification: Performance of NFTyping.typeBindings: time 0.00555/0.9561, allocations: 1.326 MB / 1.084 GB, free: 1.516 MB / 0.698 GB
Notification: Performance of NFTyping.typeClassSections: time 0.003204/0.9593, allocations: 0.7138 MB / 1.085 GB, free: 1.488 MB / 0.698 GB
Notification: Performance of NFFlatten.flatten: time 0.009182/0.9685, allocations: 5.689 MB / 1.09 GB, free: 1.48 MB / 0.698 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.002696/0.9712, allocations: 1.291 MB / 1.092 GB, free: 1.23 MB / 0.698 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.004458/0.9757, allocations: 1.321 MB / 1.093 GB, free: 1.223 MB / 0.698 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.004644/0.9804, allocations: 1.21 MB / 1.094 GB, free: 1.207 MB / 0.698 GB
Notification: Performance of NFPackage.collectConstants: time 0.0006143/0.981, allocations: 51.69 kB / 1.094 GB, free: 1.207 MB / 0.698 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.004875/0.9859, allocations: 1.637 MB / 1.096 GB, free: 1.191 MB / 0.698 GB
Notification: Performance of NFScalarize.scalarize: time 0.001272/0.9872, allocations: 0.4942 MB / 1.096 GB, free: 1.184 MB / 0.698 GB
Notification: Performance of NFVerifyModel.verify: time 0.002804/0.9901, allocations: 0.7682 MB / 1.097 GB, free: 17.15 MB / 0.7136 GB
Notification: Performance of NFConvertDAE.convert: time 0.003925/0.994, allocations: 2.171 MB / 1.099 GB, free: 17.01 MB / 0.7136 GB
Notification: Performance of FrontEnd - DAE generated: time 6.673e-06/0.994, allocations: 0 / 1.099 GB, free: 17.01 MB / 0.7136 GB
Notification: Performance of FrontEnd: time 2.234e-06/0.994, allocations: 0 / 1.099 GB, free: 17.01 MB / 0.7136 GB
Notification: Performance of Transformations before backend: time 6.169e-05/0.9941, allocations: 0 / 1.099 GB, free: 17.01 MB / 0.7136 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 253
 * Number of variables: 253
Notification: Performance of Generate backend data structure: time 0.003615/0.9977, allocations: 1.616 MB / 1.101 GB, free: 16.13 MB / 0.7136 GB
Notification: Performance of prepare preOptimizeDAE: time 6.041e-05/0.9978, allocations: 8.844 kB / 1.101 GB, free: 16.13 MB / 0.7136 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.003181/1.001, allocations: 0.4907 MB / 1.101 GB, free: 16.04 MB / 0.7136 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.002233/1.003, allocations: 1.2 MB / 1.102 GB, free: 15.67 MB / 0.7136 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 6.705e-05/1.003, allocations: 76.19 kB / 1.102 GB, free: 15.67 MB / 0.7136 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001814/1.004, allocations: 114.2 kB / 1.103 GB, free: 15.66 MB / 0.7136 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.002159/1.006, allocations: 1.372 MB / 1.104 GB, free: 15.6 MB / 0.7136 GB
Notification: Performance of preOpt findStateOrder (simulation): time 2.593e-05/1.006, allocations: 2.906 kB / 1.104 GB, free: 15.6 MB / 0.7136 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001082/1.006, allocations: 48.67 kB / 1.104 GB, free: 15.6 MB / 0.7136 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.372e-05/1.006, allocations: 37.53 kB / 1.104 GB, free: 15.6 MB / 0.7136 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001766/1.008, allocations: 1.3 MB / 1.105 GB, free: 15.59 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 0.006262/1.014, allocations: 4.96 MB / 1.11 GB, free: 13.37 MB / 0.7136 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.001145/1.015, allocations: 0.987 MB / 1.111 GB, free: 13.33 MB / 0.7136 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0006395/1.016, allocations: 0.5745 MB / 1.112 GB, free: 13.31 MB / 0.7136 GB
Notification: Performance of preOpt evalFunc (simulation): time 0.0003181/1.016, allocations: 193.3 kB / 1.112 GB, free: 13.12 MB / 0.7136 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.954e-05/1.016, allocations: 43.66 kB / 1.112 GB, free: 13.08 MB / 0.7136 GB
Notification: Performance of pre-optimization done (n=78): time 3.357e-06/1.016, allocations: 0 / 1.112 GB, free: 13.08 MB / 0.7136 GB
Notification: Performance of matching and sorting (n=81): time 0.005538/1.022, allocations: 3.101 MB / 1.115 GB, free: 12.43 MB / 0.7136 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 5.079e-05/1.022, allocations: 60.28 kB / 1.115 GB, free: 12.37 MB / 0.7136 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001215/1.023, allocations: 0.983 MB / 1.116 GB, free: 12.22 MB / 0.7136 GB
Notification: Performance of collectPreVariables (initialization): time 9.996e-05/1.023, allocations: 42.11 kB / 1.116 GB, free: 12.19 MB / 0.7136 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0004552/1.024, allocations: 0.5405 MB / 1.116 GB, free: 11.97 MB / 0.7136 GB
Notification: Performance of collectInitialBindings (initialization): time 0.0003123/1.024, allocations: 290.4 kB / 1.117 GB, free: 11.79 MB / 0.7136 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 5.419e-05/1.024, allocations: 15.56 kB / 1.117 GB, free: 11.79 MB / 0.7136 GB
Notification: Performance of setup shared object (initialization): time 0.0001684/1.024, allocations: 343.2 kB / 1.117 GB, free: 11.48 MB / 0.7136 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0006565/1.025, allocations: 431.2 kB / 1.118 GB, free: 11.48 MB / 0.7136 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0008286/1.026, allocations: 0.6048 MB / 1.118 GB, free: 11.31 MB / 0.7136 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.001799/1.027, allocations: 1.062 MB / 1.119 GB, free: 11.2 MB / 0.7136 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.447e-06/1.027, allocations: 4.531 kB / 1.119 GB, free: 11.2 MB / 0.7136 GB
Notification: Performance of matching and sorting (n=97) (initialization): time 0.002367/1.03, allocations: 1.236 MB / 1.12 GB, free: 11.07 MB / 0.7136 GB
Notification: Performance of prepare postOptimizeDAE: time 0.0001273/1.03, allocations: 173.5 kB / 1.121 GB, free: 10.89 MB / 0.7136 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.089e-05/1.03, allocations: 2.969 kB / 1.121 GB, free: 10.89 MB / 0.7136 GB
Notification: Performance of postOpt tearingSystem (initialization): time 0.0002424/1.03, allocations: 72.39 kB / 1.121 GB, free: 10.88 MB / 0.7136 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001048/1.031, allocations: 200.8 kB / 1.121 GB, free: 10.88 MB / 0.7136 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002281/1.034, allocations: 3.003 MB / 1.124 GB, free: 8.355 MB / 0.7136 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001558/1.035, allocations: 149.2 kB / 1.124 GB, free: 8.332 MB / 0.7136 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.595e-05/1.035, allocations: 28.78 kB / 1.124 GB, free: 8.332 MB / 0.7136 GB
Notification: Performance of prepare postOptimizeDAE: time 8.597e-06/1.035, allocations: 5.188 kB / 1.124 GB, free: 8.332 MB / 0.7136 GB
Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.001464/1.037, allocations: 1.11 MB / 1.125 GB, free: 8.297 MB / 0.7136 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.4e-06/1.037, allocations: 3.125 kB / 1.125 GB, free: 8.297 MB / 0.7136 GB
Notification: Performance of postOpt tearingSystem (initialization): time 0.0001737/1.037, allocations: 74.97 kB / 1.125 GB, free: 8.285 MB / 0.7136 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0006221/1.038, allocations: 174.6 kB / 1.125 GB, free: 8.285 MB / 0.7136 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001515/1.039, allocations: 1.815 MB / 1.127 GB, free: 6.941 MB / 0.7136 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001466/1.041, allocations: 143.2 kB / 1.127 GB, free: 6.918 MB / 0.7136 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.204e-05/1.041, allocations: 30.5 kB / 1.127 GB, free: 6.918 MB / 0.7136 GB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 12
 * Number of states: 0 ()
 * Number of discrete variables: 0 ()
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for initialization (92):
 * Single equations (assignments): 89
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (not torn): 2
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Equation system details (not torn):
 * Constant Jacobian (size): 0 systems
 * Linear Jacobian (size,density): 0 systems
 * Non-linear Jacobian (size): 2 systems
   {1, 1}
 * Without analytic Jacobian (size): 0 systems
Notification: Torn system details for strict tearing set:
 * Linear torn systems (#iteration vars, #inner vars, density): 1 system
   {(1,5,100.0%)}
 * Non-linear torn systems (#iteration vars, #inner vars): 0 systems
Notification: Performance of prepare postOptimizeDAE: time 0.001034/1.042, allocations: 0.6141 MB / 1.128 GB, free: 6.66 MB / 0.7136 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001889/1.042, allocations: 109.7 kB / 1.128 GB, free: 6.605 MB / 0.7136 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.00167/1.044, allocations: 1.175 MB / 1.129 GB, free: 6.316 MB / 0.7136 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 7.995e-06/1.044, allocations: 10.94 kB / 1.129 GB, free: 6.316 MB / 0.7136 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 3.867e-06/1.044, allocations: 0 / 1.129 GB, free: 6.316 MB / 0.7136 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001407/1.045, allocations: 1.233 MB / 1.13 GB, free: 5.781 MB / 0.7136 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004086/1.049, allocations: 2.801 MB / 1.133 GB, free: 4.828 MB / 0.7136 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 8.336e-06/1.049, allocations: 6.844 kB / 1.133 GB, free: 4.824 MB / 0.7136 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001018/1.05, allocations: 240.8 kB / 1.133 GB, free: 4.777 MB / 0.7136 GB
Notification: Performance of postOpt tearingSystem (simulation): time 0.000202/1.05, allocations: 66.78 kB / 1.133 GB, free: 4.758 MB / 0.7136 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 6.612e-05/1.05, allocations: 30.67 kB / 1.133 GB, free: 4.75 MB / 0.7136 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.002322/1.053, allocations: 2.985 MB / 1.136 GB, free: 2.121 MB / 0.7136 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.749e-06/1.053, allocations: 3.219 kB / 1.136 GB, free: 2.121 MB / 0.7136 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002756/1.056, allocations: 1.925 MB / 1.138 GB, free: 1.535 MB / 0.7136 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0008627/1.056, allocations: 343.5 kB / 1.138 GB, free: 1.352 MB / 0.7136 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001414/1.057, allocations: 24.45 kB / 1.138 GB, free: 1.348 MB / 0.7136 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001093/1.058, allocations: 123 kB / 1.139 GB, free: 1.297 MB / 0.7136 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001357/1.058, allocations: 58.86 kB / 1.139 GB, free: 1.277 MB / 0.7136 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.708e-05/1.058, allocations: 32.33 kB / 1.139 GB, free: 1.273 MB / 0.7136 GB
Notification: Performance of sorting global known variables: time 0.0009744/1.059, allocations: 0.7019 MB / 1.139 GB, free: 1.035 MB / 0.7136 GB
Notification: Performance of sort global known variables: time 4.01e-07/1.059, allocations: 0 / 1.139 GB, free: 1.035 MB / 0.7136 GB
Notification: Performance of remove unused functions: time 0.002006/1.061, allocations: 0.6645 MB / 1.14 GB, free: 1.031 MB / 0.7136 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 9
 * Number of states: 7 (vol[1].dynBal.U,vol[1].dynBal.mXi[1],vol[2].dynBal.U,vol[2].dynBal.mXi[1],vol[3].dynBal.U,vol[3].dynBal.m,vol[3].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 (76):
 * Single equations (assignments): 73
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (not torn): 2
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Equation system details (not torn):
 * Constant Jacobian (size): 0 systems
 * Linear Jacobian (size,density): 0 systems
 * Non-linear Jacobian (size): 2 systems
   {1, 1}
 * Without analytic Jacobian (size): 0 systems
Notification: Torn system details for strict tearing set:
 * Linear torn systems (#iteration vars, #inner vars, density): 1 system
   {(1,5,100.0%)}
 * Non-linear torn systems (#iteration vars, #inner vars): 0 systems
Notification: Performance of Backend phase and start with SimCode phase: time 0.0006254/1.062, allocations: 231.2 kB / 1.14 GB, free: 0.8984 MB / 0.7136 GB
Notification: Performance of simCode: created initialization part: time 0.003221/1.065, allocations: 1.875 MB / 1.142 GB, free: 364 kB / 0.7136 GB
Notification: Performance of simCode: created event and clocks part: time 7.504e-06/1.065, allocations: 5.812 kB / 1.142 GB, free: 364 kB / 0.7136 GB
Notification: Performance of simCode: created simulation system equations: time 0.0008632/1.066, allocations: 0.674 MB / 1.143 GB, free: 136 kB / 0.7136 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.004122/1.07, allocations: 0.7992 MB / 1.143 GB, free: 15.87 MB / 0.7292 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.005622/1.075, allocations: 3.747 MB / 1.147 GB, free: 13.71 MB / 0.7292 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001138/1.077, allocations: 1.422 MB / 1.149 GB, free: 12.77 MB / 0.7292 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0004336/1.077, allocations: 94.53 kB / 1.149 GB, free: 12.76 MB / 0.7292 GB
Notification: Performance of SimCode: time 1.002e-06/1.077, allocations: 4 kB / 1.149 GB, free: 12.76 MB / 0.7292 GB
Notification: Performance of Templates: time 0.0575/1.135, allocations: 43.31 MB / 1.191 GB, free: 3.363 MB / 0.7605 GB
make -j1 -f Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.makefile
(rm -f Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.pipe >> ../files/Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.sim & ./Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_maint.7.0.x_Buildings.Fluid.MixingVolumes.BaseClasses.Validation.MixingVolumeHeatPortAir.pipe 2>&1)