Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.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.Chillers.Validation.Carnot_TEva_reverseFlow,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow") translateModel(Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow") [/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 0.2016/0.2038, allocations: 80.83 MB / 0.6706 GB, free: 1.996 MB / 0.4981 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow): time 0.06637/0.2702, allocations: 60.25 MB / 0.7294 GB, free: 5.535 MB / 0.5606 GB Notification: Performance of NFInst.instExpressions: time 0.01718/0.2875, allocations: 10.99 MB / 0.7402 GB, free: 10.51 MB / 0.5762 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.003626/0.2912, allocations: 47.75 kB / 0.7402 GB, free: 10.46 MB / 0.5762 GB Notification: Performance of NFTyping.typeComponents: time 0.00399/0.2952, allocations: 0.7025 MB / 0.7409 GB, free: 9.758 MB / 0.5762 GB Notification: Performance of NFTyping.typeBindings: time 0.0127/0.308, allocations: 1.883 MB / 0.7428 GB, free: 7.867 MB / 0.5762 GB Notification: Performance of NFTyping.typeClassSections: time 0.00601/0.314, allocations: 1.111 MB / 0.7438 GB, free: 6.766 MB / 0.5762 GB Notification: Performance of NFFlatten.flatten: time 0.008039/0.3221, allocations: 3.025 MB / 0.7468 GB, free: 3.73 MB / 0.5762 GB Notification: Performance of NFFlatten.resolveConnections: time 0.00309/0.3252, allocations: 1.127 MB / 0.7479 GB, free: 2.57 MB / 0.5762 GB Notification: Performance of NFEvalConstants.evaluate: time 0.006619/0.3319, allocations: 1.47 MB / 0.7493 GB, free: 1.098 MB / 0.5762 GB Notification: Performance of NFSimplifyModel.simplify: time 0.003138/0.3351, allocations: 0.9802 MB / 0.7503 GB, free: 116 kB / 0.5762 GB Notification: Performance of NFPackage.collectConstants: time 0.5658/0.9009, allocations: 126 kB / 0.7504 GB, free: 22.36 MB / 0.5762 GB Notification: Performance of NFFlatten.collectFunctions: time 0.00333/0.9043, allocations: 1.089 MB / 0.7515 GB, free: 22.36 MB / 0.5762 GB Notification: Performance of NFScalarize.scalarize: time 0.0004514/0.9048, allocations: 312.9 kB / 0.7518 GB, free: 22.36 MB / 0.5762 GB Notification: Performance of NFVerifyModel.verify: time 0.001302/0.9061, allocations: 0.731 MB / 0.7525 GB, free: 22.36 MB / 0.5762 GB Notification: Performance of NFConvertDAE.convert: time 0.004069/0.9102, allocations: 2.198 MB / 0.7546 GB, free: 22.29 MB / 0.5762 GB Notification: Performance of FrontEnd - DAE generated: time 7.795e-06/0.9102, allocations: 5.297 kB / 0.7546 GB, free: 22.29 MB / 0.5762 GB Notification: Performance of FrontEnd: time 2.164e-06/0.9102, allocations: 0 / 0.7546 GB, free: 22.29 MB / 0.5762 GB Notification: Performance of Transformations before backend: time 2.531e-05/0.9102, allocations: 0 / 0.7546 GB, free: 22.29 MB / 0.5762 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 220 * Number of variables: 220 Notification: Performance of Generate backend data structure: time 0.003744/0.914, allocations: 1.733 MB / 0.7563 GB, free: 21.4 MB / 0.5762 GB Notification: Performance of prepare preOptimizeDAE: time 5.359e-05/0.914, allocations: 11.42 kB / 0.7563 GB, free: 21.4 MB / 0.5762 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.003284/0.9173, allocations: 0.493 MB / 0.7568 GB, free: 21.33 MB / 0.5762 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002607/0.92, allocations: 1.107 MB / 0.7579 GB, free: 20.98 MB / 0.5762 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 9.214e-05/0.9201, allocations: 68.25 kB / 0.758 GB, free: 20.98 MB / 0.5762 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001777/0.9202, allocations: 89.03 kB / 0.7581 GB, free: 20.98 MB / 0.5762 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003506/0.9238, allocations: 1.269 MB / 0.7593 GB, free: 20.71 MB / 0.5762 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.843e-05/0.9238, allocations: 1.75 kB / 0.7593 GB, free: 20.71 MB / 0.5762 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001088/0.9239, allocations: 42.56 kB / 0.7593 GB, free: 20.71 MB / 0.5762 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 6.856e-05/0.924, allocations: 29.16 kB / 0.7594 GB, free: 20.71 MB / 0.5762 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.00364/0.9276, allocations: 1.093 MB / 0.7604 GB, free: 20.68 MB / 0.5762 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 0.008519/0.9362, allocations: 6.222 MB / 0.7665 GB, free: 16.82 MB / 0.5762 GB Notification: Performance of preOpt comSubExp (simulation): time 0.00308/0.9393, allocations: 0.8635 MB / 0.7673 GB, free: 16.78 MB / 0.5762 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001063/0.9403, allocations: 368.9 kB / 0.7677 GB, free: 16.76 MB / 0.5762 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0002301/0.9406, allocations: 262.2 kB / 0.768 GB, free: 16.47 MB / 0.5762 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.635e-05/0.9406, allocations: 40.97 kB / 0.768 GB, free: 16.43 MB / 0.5762 GB Notification: Performance of pre-optimization done (n=43): time 2.394e-06/0.9406, allocations: 0 / 0.768 GB, free: 16.43 MB / 0.5762 GB Notification: Performance of matching and sorting (n=43): time 0.007998/0.9487, allocations: 1.913 MB / 0.7699 GB, free: 16.18 MB / 0.5762 GB Notification: Performance of inlineWhenForInitialization (initialization): time 5.343e-05/0.9487, allocations: 163.6 kB / 0.77 GB, free: 15.99 MB / 0.5762 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001438/0.9502, allocations: 1.027 MB / 0.771 GB, free: 15.84 MB / 0.5762 GB Notification: Performance of collectPreVariables (initialization): time 9.353e-05/0.9503, allocations: 36.17 kB / 0.7711 GB, free: 15.8 MB / 0.5762 GB Notification: Performance of collectInitialEqns (initialization): time 0.0003875/0.9507, allocations: 0.572 MB / 0.7716 GB, free: 15.57 MB / 0.5762 GB Notification: Performance of collectInitialBindings (initialization): time 0.0001448/0.9508, allocations: 157.1 kB / 0.7718 GB, free: 15.48 MB / 0.5762 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0002639/0.9511, allocations: 154.2 kB / 0.7719 GB, free: 15.45 MB / 0.5762 GB Notification: Performance of setup shared object (initialization): time 6.194e-05/0.9512, allocations: 332.6 kB / 0.7722 GB, free: 15.15 MB / 0.5762 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001123/0.9523, allocations: 382.3 kB / 0.7726 GB, free: 15.13 MB / 0.5762 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001348/0.9536, allocations: 0.6738 MB / 0.7732 GB, free: 14.79 MB / 0.5762 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.002291/0.956, allocations: 0.8967 MB / 0.7741 GB, free: 14.54 MB / 0.5762 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.431e-06/0.956, allocations: 1.156 kB / 0.7741 GB, free: 14.54 MB / 0.5762 GB Notification: Performance of matching and sorting (n=82) (initialization): time 0.00469/0.9607, allocations: 1.392 MB / 0.7755 GB, free: 14.39 MB / 0.5762 GB Notification: Performance of prepare postOptimizeDAE: time 2.377e-05/0.9607, allocations: 8.344 kB / 0.7755 GB, free: 14.39 MB / 0.5762 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.305e-05/0.9607, allocations: 6.781 kB / 0.7755 GB, free: 14.39 MB / 0.5762 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.001118/0.9618, allocations: 330.4 kB / 0.7758 GB, free: 14.37 MB / 0.5762 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007196/0.9626, allocations: 169 kB / 0.776 GB, free: 14.37 MB / 0.5762 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001462/0.9641, allocations: 0.9428 MB / 0.7769 GB, free: 13.83 MB / 0.5762 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001468/0.9655, allocations: 168.9 kB / 0.7771 GB, free: 13.78 MB / 0.5762 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.006e-05/0.9656, allocations: 30.78 kB / 0.7771 GB, free: 13.78 MB / 0.5762 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.00144/0.9671, allocations: 0.5626 MB / 0.7776 GB, free: 13.69 MB / 0.5762 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.001278/0.9684, allocations: 0.649 MB / 0.7783 GB, free: 13.34 MB / 0.5762 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.002081/0.9705, allocations: 0.8437 MB / 0.7791 GB, free: 13.09 MB / 0.5762 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.17e-06/0.9705, allocations: 2.625 kB / 0.7791 GB, free: 13.09 MB / 0.5762 GB Notification: Performance of matching and sorting (n=82) (initialization_lambda0): time 0.003882/0.9744, allocations: 1.255 MB / 0.7803 GB, free: 12.96 MB / 0.5762 GB Notification: Performance of prepare postOptimizeDAE: time 1.753e-05/0.9744, allocations: 10.84 kB / 0.7803 GB, free: 12.96 MB / 0.5762 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.219e-05/0.9744, allocations: 6.094 kB / 0.7803 GB, free: 12.96 MB / 0.5762 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0009776/0.9754, allocations: 297.4 kB / 0.7806 GB, free: 12.94 MB / 0.5762 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007088/0.9761, allocations: 160.4 kB / 0.7808 GB, free: 12.93 MB / 0.5762 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001331/0.9774, allocations: 0.8954 MB / 0.7816 GB, free: 12.4 MB / 0.5762 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001475/0.9789, allocations: 140.6 kB / 0.7818 GB, free: 12.37 MB / 0.5762 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.356e-05/0.979, allocations: 32.03 kB / 0.7818 GB, free: 12.37 MB / 0.5762 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 27 * 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 0.000303/0.9793, allocations: 228 kB / 0.782 GB, free: 12.18 MB / 0.5762 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002286/0.9796, allocations: 112 kB / 0.7821 GB, free: 12.12 MB / 0.5762 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0031/0.9827, allocations: 1.029 MB / 0.7831 GB, free: 12.03 MB / 0.5762 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 8.085e-06/0.9827, allocations: 3.906 kB / 0.7831 GB, free: 12.03 MB / 0.5762 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.935e-06/0.9827, allocations: 6.516 kB / 0.7831 GB, free: 12.03 MB / 0.5762 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 6.091e-06/0.9827, allocations: 1.375 kB / 0.7832 GB, free: 12.03 MB / 0.5762 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.006021/0.9887, allocations: 2.211 MB / 0.7853 GB, free: 11.61 MB / 0.5762 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 6.672e-06/0.9888, allocations: 1.094 kB / 0.7853 GB, free: 11.61 MB / 0.5762 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0005671/0.9893, allocations: 88.94 kB / 0.7854 GB, free: 11.61 MB / 0.5762 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.001123/0.9905, allocations: 329.8 kB / 0.7857 GB, free: 11.59 MB / 0.5762 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.892e-05/0.9906, allocations: 14.38 kB / 0.7857 GB, free: 11.59 MB / 0.5762 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.001577/0.9921, allocations: 0.9319 MB / 0.7866 GB, free: 11.05 MB / 0.5762 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 7.965e-06/0.9922, allocations: 2.5 kB / 0.7866 GB, free: 11.05 MB / 0.5762 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.00444/0.9966, allocations: 1.251 MB / 0.7879 GB, free: 10.77 MB / 0.5762 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0008664/0.9975, allocations: 281.3 kB / 0.7881 GB, free: 10.61 MB / 0.5762 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001835/0.9977, allocations: 14.97 kB / 0.7881 GB, free: 10.61 MB / 0.5762 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0009486/0.9986, allocations: 89.59 kB / 0.7882 GB, free: 10.6 MB / 0.5762 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001028/0.9988, allocations: 28.31 kB / 0.7883 GB, free: 10.6 MB / 0.5762 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.597e-05/0.9988, allocations: 24.92 kB / 0.7883 GB, free: 10.6 MB / 0.5762 GB Notification: Performance of sorting global known variables: time 0.001164/1, allocations: 0.7146 MB / 0.789 GB, free: 10.49 MB / 0.5762 GB Notification: Performance of sort global known variables: time 1.2e-07/1, allocations: 0 / 0.789 GB, free: 10.49 MB / 0.5762 GB Notification: Performance of remove unused functions: time 0.002239/1.002, allocations: 0.5643 MB / 0.7895 GB, free: 10.42 MB / 0.5762 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 8 * 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 (29): * Single equations (assignments): 28 * 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 Backend phase and start with SimCode phase: time 0.0007041/1.003, allocations: 270.8 kB / 0.7898 GB, free: 10.3 MB / 0.5762 GB Notification: Performance of simCode: created initialization part: time 0.004115/1.007, allocations: 1.371 MB / 0.7911 GB, free: 10.26 MB / 0.5762 GB Notification: Performance of simCode: created event and clocks part: time 5.44e-06/1.007, allocations: 2.844 kB / 0.7911 GB, free: 10.26 MB / 0.5762 GB Notification: Performance of simCode: created simulation system equations: time 0.001141/1.008, allocations: 417.1 kB / 0.7915 GB, free: 10.24 MB / 0.5762 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002405/1.011, allocations: 0.5286 MB / 0.792 GB, free: 10.16 MB / 0.5762 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.00353/1.014, allocations: 1.851 MB / 0.7938 GB, free: 9.398 MB / 0.5762 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0004383/1.015, allocations: 1.059 MB / 0.7949 GB, free: 8.68 MB / 0.5762 GB Notification: Performance of simCode: alias equations: time 0.001025/1.016, allocations: 245.3 kB / 0.7951 GB, free: 8.602 MB / 0.5762 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002293/1.016, allocations: 81.73 kB / 0.7952 GB, free: 8.594 MB / 0.5762 GB Notification: Performance of SimCode: time 7.42e-07/1.016, allocations: 4 kB / 0.7952 GB, free: 8.59 MB / 0.5762 GB Notification: Performance of Templates: time 0.03868/1.055, allocations: 26.04 MB / 0.8206 GB, free: 5.672 MB / 0.5919 GB make -j1 -f Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.makefile (rm -f Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.pipe ; mkfifo Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.pipe ; head -c 1048576 < Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.pipe >> ../files/Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.sim & ./Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_3.0.0_Buildings.Fluid.Chillers.Validation.Carnot_TEva_reverseFlow.pipe 2>&1)