Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_StateGraph2 2.0.2/package.mo", uses=false) 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 3.0.0/package.mo", uses=false) Using package Buildings with version 3.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 3.0.0/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) Using package Modelica_StateGraph2 with version 2.0.2 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_StateGraph2 2.0.2/package.mo) Running command: translateModel(Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL") translateModel(Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL") [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_StateGraph2 2.0.2/package.mo:257:38-257:110:writable] Warning: The file was not encoded in UTF-8: "

An important practical aspect of state machines is the abilit...". Defaulting to 7-bit ASCII with unknown characters replaced by '?'. To change encoding when loading a file: loadFile(encoding="ISO-XXXX-YY"). To change it in a package: add a file package.encoding at the top-level. Note: The Modelica Language Specification only allows files encoded in UTF-8. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_StateGraph2 2.0.2/package.mo:761:36-761:108:writable] Warning: The file was not encoded in UTF-8: "

The Modelica_StateGraph2 library is described in detail in (O...". Defaulting to 7-bit ASCII with unknown characters replaced by '?'. To change encoding when loading a file: loadFile(encoding="ISO-XXXX-YY"). To change it in a package: add a file package.encoding at the top-level. Note: The Modelica Language Specification only allows files encoded in UTF-8. [/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_StateGraph2 2.0.2/package.mo:1435:36-1435:108:writable] Warning: The file was not encoded in UTF-8: "

Main Authors:

SCode: time 0.1924/0.1943, allocations: 80.83 MB / 0.5897 GB, free: 7.113 MB / 446.1 MB Notification: Performance of NFInst.instantiate(Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL): time 0.06174/0.2561, allocations: 59.91 MB / 0.6482 GB, free: 10.99 MB / 0.4981 GB Notification: Performance of NFInst.instExpressions: time 0.01797/0.2741, allocations: 11.05 MB / 0.659 GB, free: 15.91 MB / 0.5137 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00253/0.2767, allocations: 43.75 kB / 0.659 GB, free: 15.86 MB / 0.5137 GB Notification: Performance of NFTyping.typeComponents: time 0.003593/0.2804, allocations: 0.5711 MB / 0.6596 GB, free: 15.29 MB / 0.5137 GB Notification: Performance of NFTyping.typeBindings: time 0.006296/0.2867, allocations: 1.734 MB / 0.6613 GB, free: 13.55 MB / 0.5137 GB Notification: Performance of NFTyping.typeClassSections: time 0.003729/0.2905, allocations: 0.9799 MB / 0.6622 GB, free: 12.59 MB / 0.5137 GB Notification: Performance of NFFlatten.flatten: time 0.006263/0.2968, allocations: 3.962 MB / 0.6661 GB, free: 8.613 MB / 0.5137 GB Notification: Performance of NFFlatten.resolveConnections: time 0.002179/0.299, allocations: 0.9182 MB / 0.667 GB, free: 7.664 MB / 0.5137 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003821/0.3028, allocations: 1.272 MB / 0.6682 GB, free: 6.387 MB / 0.5137 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002843/0.3057, allocations: 0.9645 MB / 0.6692 GB, free: 5.418 MB / 0.5137 GB Notification: Performance of NFPackage.collectConstants: time 0.0003299/0.3061, allocations: 60 kB / 0.6692 GB, free: 5.359 MB / 0.5137 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003615/0.3097, allocations: 1.037 MB / 0.6702 GB, free: 4.32 MB / 0.5137 GB Notification: Performance of NFScalarize.scalarize: time 0.0003253/0.31, allocations: 250.9 kB / 0.6705 GB, free: 4.074 MB / 0.5137 GB Notification: Performance of NFVerifyModel.verify: time 0.001094/0.3112, allocations: 0.6684 MB / 0.6711 GB, free: 3.402 MB / 0.5137 GB Notification: Performance of NFConvertDAE.convert: time 0.004231/0.3154, allocations: 2.146 MB / 0.6732 GB, free: 1.25 MB / 0.5137 GB Notification: Performance of FrontEnd - DAE generated: time 1.314e-05/0.3155, allocations: 4 kB / 0.6732 GB, free: 1.246 MB / 0.5137 GB Notification: Performance of FrontEnd: time 2.284e-06/0.3155, allocations: 3.938 kB / 0.6732 GB, free: 1.242 MB / 0.5137 GB Notification: Performance of Transformations before backend: time 4.19e-05/0.3155, allocations: 0 / 0.6732 GB, free: 1.242 MB / 0.5137 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 218 * Number of variables: 218 Notification: Performance of Generate backend data structure: time 0.004109/0.3196, allocations: 1.726 MB / 0.6749 GB, free: 15.46 MB / 0.5294 GB Notification: Performance of prepare preOptimizeDAE: time 4.689e-05/0.3197, allocations: 12.03 kB / 0.6749 GB, free: 15.45 MB / 0.5294 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002599/0.3223, allocations: 458.8 kB / 0.6754 GB, free: 15 MB / 0.5294 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002648/0.325, allocations: 1.074 MB / 0.6764 GB, free: 13.88 MB / 0.5294 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.000354/0.3253, allocations: 133.9 kB / 0.6765 GB, free: 13.75 MB / 0.5294 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.000227/0.3256, allocations: 88 kB / 0.6766 GB, free: 13.66 MB / 0.5294 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002946/0.3285, allocations: 1.233 MB / 0.6778 GB, free: 12.34 MB / 0.5294 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.184e-05/0.3286, allocations: 4 kB / 0.6778 GB, free: 12.34 MB / 0.5294 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001052/0.3287, allocations: 36 kB / 0.6779 GB, free: 12.3 MB / 0.5294 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.321e-05/0.3287, allocations: 31.98 kB / 0.6779 GB, free: 12.27 MB / 0.5294 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002872/0.3316, allocations: 1.038 MB / 0.6789 GB, free: 11.23 MB / 0.5294 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 0.007773/0.3394, allocations: 5.983 MB / 0.6848 GB, free: 4.863 MB / 0.5294 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002352/0.3418, allocations: 0.6868 MB / 0.6854 GB, free: 4.168 MB / 0.5294 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0007038/0.3425, allocations: 285.3 kB / 0.6857 GB, free: 3.887 MB / 0.5294 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0002954/0.3428, allocations: 263.8 kB / 0.686 GB, free: 3.574 MB / 0.5294 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.847e-05/0.3429, allocations: 38.89 kB / 0.686 GB, free: 3.527 MB / 0.5294 GB Notification: Performance of pre-optimization done (n=40): time 3.115e-06/0.3429, allocations: 0 / 0.686 GB, free: 3.527 MB / 0.5294 GB Notification: Performance of matching and sorting (n=40): time 0.009493/0.3524, allocations: 2.07 MB / 0.688 GB, free: 1.43 MB / 0.5294 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001075/0.3525, allocations: 158.2 kB / 0.6882 GB, free: 1.238 MB / 0.5294 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001929/0.3545, allocations: 1.12 MB / 0.6893 GB, free: 108 kB / 0.5294 GB Notification: Performance of collectPreVariables (initialization): time 0.0001205/0.3546, allocations: 45.62 kB / 0.6893 GB, free: 56 kB / 0.5294 GB Notification: Performance of collectInitialEqns (initialization): time 0.4148/0.7694, allocations: 0.5684 MB / 0.6899 GB, free: 99.62 MB / 0.5294 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002404/0.7697, allocations: 149.9 kB / 0.69 GB, free: 99.57 MB / 0.5294 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003555/0.77, allocations: 153.2 kB / 0.6901 GB, free: 99.55 MB / 0.5294 GB Notification: Performance of setup shared object (initialization): time 8.118e-05/0.7701, allocations: 334 kB / 0.6905 GB, free: 99.25 MB / 0.5294 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001185/0.7713, allocations: 355.2 kB / 0.6908 GB, free: 99.24 MB / 0.5294 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001357/0.7727, allocations: 0.6694 MB / 0.6915 GB, free: 98.86 MB / 0.5294 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.002224/0.7749, allocations: 0.8248 MB / 0.6923 GB, free: 98.62 MB / 0.5294 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.136e-05/0.775, allocations: 2.625 kB / 0.6923 GB, free: 98.62 MB / 0.5294 GB Notification: Performance of matching and sorting (n=82) (initialization): time 0.003579/0.7785, allocations: 1.157 MB / 0.6934 GB, free: 98.52 MB / 0.5294 GB Notification: Performance of prepare postOptimizeDAE: time 4.604e-05/0.7786, allocations: 5.938 kB / 0.6934 GB, free: 98.52 MB / 0.5294 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.644e-05/0.7787, allocations: 11.69 kB / 0.6934 GB, free: 98.52 MB / 0.5294 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001247/0.7799, allocations: 345.3 kB / 0.6937 GB, free: 98.51 MB / 0.5294 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.000669/0.7806, allocations: 159.2 kB / 0.6939 GB, free: 98.51 MB / 0.5294 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001521/0.7821, allocations: 0.9533 MB / 0.6948 GB, free: 97.99 MB / 0.5294 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.00169/0.7838, allocations: 218 kB / 0.695 GB, free: 97.94 MB / 0.5294 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.8e-05/0.7839, allocations: 38.77 kB / 0.6951 GB, free: 97.94 MB / 0.5294 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.001302/0.7852, allocations: 0.5366 MB / 0.6956 GB, free: 97.86 MB / 0.5294 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.00111/0.7863, allocations: 0.6361 MB / 0.6962 GB, free: 97.5 MB / 0.5294 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.001669/0.788, allocations: 0.7863 MB / 0.697 GB, free: 97.25 MB / 0.5294 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.169e-06/0.788, allocations: 3.938 kB / 0.697 GB, free: 97.25 MB / 0.5294 GB Notification: Performance of matching and sorting (n=82) (initialization_lambda0): time 0.003098/0.7912, allocations: 1.097 MB / 0.6981 GB, free: 97.13 MB / 0.5294 GB Notification: Performance of prepare postOptimizeDAE: time 2.682e-05/0.7912, allocations: 6.078 kB / 0.6981 GB, free: 97.13 MB / 0.5294 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.417e-05/0.7912, allocations: 9.625 kB / 0.6981 GB, free: 97.13 MB / 0.5294 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001091/0.7923, allocations: 316 kB / 0.6984 GB, free: 97.11 MB / 0.5294 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0006626/0.793, allocations: 145.3 kB / 0.6985 GB, free: 97.11 MB / 0.5294 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.00145/0.7945, allocations: 0.9193 MB / 0.6994 GB, free: 96.57 MB / 0.5294 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001825/0.7963, allocations: 187.1 kB / 0.6996 GB, free: 96.53 MB / 0.5294 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.759e-05/0.7964, allocations: 37.7 kB / 0.6996 GB, free: 96.53 MB / 0.5294 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 30 * 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 (69): * Single equations (assignments): 68 * Array equations: 0 * Algorithm blocks: 0 * 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 {(1,13)} Notification: Performance of prepare postOptimizeDAE: time 0.0003351/0.7967, allocations: 230.2 kB / 0.6998 GB, free: 96.33 MB / 0.5294 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002246/0.797, allocations: 111.7 kB / 0.6999 GB, free: 96.28 MB / 0.5294 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004538/0.8015, allocations: 1.098 MB / 0.701 GB, free: 96.18 MB / 0.5294 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.338e-05/0.8016, allocations: 7.422 kB / 0.701 GB, free: 96.18 MB / 0.5294 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 9.237e-06/0.8016, allocations: 0 / 0.701 GB, free: 96.18 MB / 0.5294 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 9.829e-06/0.8016, allocations: 6.266 kB / 0.701 GB, free: 96.18 MB / 0.5294 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.005741/0.8073, allocations: 2.128 MB / 0.7031 GB, free: 95.66 MB / 0.5294 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 9.738e-06/0.8074, allocations: 7.797 kB / 0.7031 GB, free: 95.65 MB / 0.5294 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0003334/0.8077, allocations: 71.28 kB / 0.7032 GB, free: 95.64 MB / 0.5294 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.001107/0.8088, allocations: 340 kB / 0.7035 GB, free: 95.56 MB / 0.5294 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.361e-05/0.8089, allocations: 13.55 kB / 0.7035 GB, free: 95.55 MB / 0.5294 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001509/0.8104, allocations: 0.9564 MB / 0.7045 GB, free: 94.88 MB / 0.5294 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 6.292e-06/0.8104, allocations: 2.969 kB / 0.7045 GB, free: 94.88 MB / 0.5294 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.00282/0.8133, allocations: 1.018 MB / 0.7055 GB, free: 94.37 MB / 0.5294 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0005935/0.8139, allocations: 268.1 kB / 0.7057 GB, free: 94.16 MB / 0.5294 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001813/0.8141, allocations: 10.5 kB / 0.7057 GB, free: 94.16 MB / 0.5294 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001084/0.8152, allocations: 116.6 kB / 0.7058 GB, free: 94.13 MB / 0.5294 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001199/0.8153, allocations: 30.59 kB / 0.7059 GB, free: 94.13 MB / 0.5294 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.848e-05/0.8154, allocations: 35.11 kB / 0.7059 GB, free: 94.12 MB / 0.5294 GB Notification: Performance of sorting global known variables: time 0.001564/0.8169, allocations: 0.7642 MB / 0.7066 GB, free: 93.8 MB / 0.5294 GB Notification: Performance of sort global known variables: time 1.212e-06/0.817, allocations: 1.125 kB / 0.7066 GB, free: 93.8 MB / 0.5294 GB Notification: Performance of remove unused functions: time 0.002251/0.8192, allocations: 0.5631 MB / 0.7072 GB, free: 93.71 MB / 0.5294 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 11 * 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 simulation (28): * Single equations (assignments): 26 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 1 * 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 {(1,13)} Notification: Performance of Backend phase and start with SimCode phase: time 0.0007598/0.82, allocations: 267.8 kB / 0.7074 GB, free: 93.59 MB / 0.5294 GB Notification: Performance of simCode: created initialization part: time 0.003963/0.824, allocations: 1.238 MB / 0.7087 GB, free: 93.23 MB / 0.5294 GB Notification: Performance of simCode: created event and clocks part: time 1.634e-05/0.824, allocations: 1.375 kB / 0.7087 GB, free: 93.23 MB / 0.5294 GB Notification: Performance of simCode: created simulation system equations: time 0.00115/0.8252, allocations: 344.9 kB / 0.709 GB, free: 93.14 MB / 0.5294 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003363/0.8285, allocations: 0.5517 MB / 0.7095 GB, free: 93.01 MB / 0.5294 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.006504/0.8351, allocations: 2.408 MB / 0.7119 GB, free: 91.64 MB / 0.5294 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006507/0.8358, allocations: 1.059 MB / 0.7129 GB, free: 90.83 MB / 0.5294 GB Notification: Performance of simCode: alias equations: time 0.001585/0.8374, allocations: 245.4 kB / 0.7131 GB, free: 90.73 MB / 0.5294 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002585/0.8376, allocations: 84.16 kB / 0.7132 GB, free: 90.71 MB / 0.5294 GB Notification: Performance of SimCode: time 1.673e-06/0.8376, allocations: 0 / 0.7132 GB, free: 90.71 MB / 0.5294 GB Notification: Performance of Templates: time 0.03984/0.8775, allocations: 25.2 MB / 0.7378 GB, free: 70.58 MB / 0.5294 GB make -j1 -f Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.makefile (rm -f Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.pipe ; mkfifo Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.pipe ; head -c 1048576 < Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.pipe >> ../files/Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.sim & ./Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_3.0.0_Buildings.Fluid.HeatPumps.Validation.Carnot_TCon_etaPL.pipe 2>&1)