Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.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/NcDataReader2 2.5.1-master/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo", uses=false) Using package BuildingSystems with version 2.0.0-beta (/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo) Using package NcDataReader2 with version 2.5.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/NcDataReader2 2.5.1-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: translateModel(BuildingSystems.Fluid.Chillers.Examples.Carnot_y,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y") translateModel(BuildingSystems.Fluid.Chillers.Examples.Carnot_y,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001728/0.001728, allocations: 110.5 kB / 16.41 MB, free: 6.508 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001594/0.001594, allocations: 181.2 kB / 17.34 MB, free: 5.738 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.443/1.443, allocations: 222.9 MB / 241 MB, free: 15.13 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/NcDataReader2 2.5.1-master/package.mo): time 0.002523/0.002523, allocations: 294.7 kB / 291.5 MB, free: 14.43 MB / 238.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/BuildingSystems 2.0.0-master/package.mo): time 1.045/1.045, allocations: 169.3 MB / 0.499 GB, free: 4.414 MB / 382.1 MB Notification: Performance of FrontEnd - loaded program: time 0.002732/0.002732, allocations: 99.83 kB / 0.6821 GB, free: 6.965 MB / 494.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.4973/0.5001, allocations: 86.97 MB / 0.767 GB, free: 3.934 MB / 0.5294 GB Notification: Performance of NFInst.instantiate(BuildingSystems.Fluid.Chillers.Examples.Carnot_y): time 0.07957/0.5796, allocations: 75.26 MB / 0.8405 GB, free: 8.41 MB / 0.6075 GB Notification: Performance of NFInst.instExpressions: time 0.02076/0.6004, allocations: 12.77 MB / 0.853 GB, free: 11.61 MB / 0.6231 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.002446/0.6028, allocations: 63.62 kB / 0.8531 GB, free: 11.55 MB / 0.6231 GB Notification: Performance of NFTyping.typeComponents: time 0.002332/0.6052, allocations: 0.8734 MB / 0.8539 GB, free: 10.67 MB / 0.6231 GB Notification: Performance of NFTyping.typeBindings: time 0.007034/0.6122, allocations: 2.59 MB / 0.8564 GB, free: 8.066 MB / 0.6231 GB Notification: Performance of NFTyping.typeClassSections: time 0.00362/0.6158, allocations: 1.394 MB / 0.8578 GB, free: 6.684 MB / 0.6231 GB Notification: Performance of NFFlatten.flatten: time 0.00645/0.6223, allocations: 4.386 MB / 0.8621 GB, free: 2.289 MB / 0.6231 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001872/0.6241, allocations: 1.183 MB / 0.8632 GB, free: 1.066 MB / 0.6231 GB Notification: Performance of NFEvalConstants.evaluate: time 0.003693/0.6278, allocations: 1.66 MB / 0.8649 GB, free: 15.41 MB / 0.6387 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002078/0.6299, allocations: 1.194 MB / 0.866 GB, free: 14.21 MB / 0.6387 GB Notification: Performance of NFPackage.collectConstants: time 0.00027/0.6302, allocations: 168 kB / 0.8662 GB, free: 14.04 MB / 0.6387 GB Notification: Performance of NFFlatten.collectFunctions: time 0.002955/0.6331, allocations: 1.4 MB / 0.8676 GB, free: 12.64 MB / 0.6387 GB Notification: Performance of NFScalarize.scalarize: time 0.0004332/0.6336, allocations: 422.3 kB / 0.868 GB, free: 12.23 MB / 0.6387 GB Notification: Performance of NFVerifyModel.verify: time 0.001117/0.6347, allocations: 0.9021 MB / 0.8688 GB, free: 11.32 MB / 0.6387 GB Notification: Performance of NFConvertDAE.convert: time 0.004474/0.6392, allocations: 2.883 MB / 0.8717 GB, free: 8.434 MB / 0.6387 GB Notification: Performance of FrontEnd - DAE generated: time 4.609e-06/0.6392, allocations: 0 / 0.8717 GB, free: 8.434 MB / 0.6387 GB Notification: Performance of FrontEnd: time 1.292e-06/0.6392, allocations: 0 / 0.8717 GB, free: 8.434 MB / 0.6387 GB Notification: Performance of Transformations before backend: time 2.761e-05/0.6392, allocations: 0 / 0.8717 GB, free: 8.434 MB / 0.6387 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 240 * Number of variables: 240 Notification: Performance of Generate backend data structure: time 0.00414/0.6433, allocations: 2.135 MB / 0.8737 GB, free: 6.227 MB / 0.6387 GB Notification: Performance of prepare preOptimizeDAE: time 3.667e-05/0.6434, allocations: 12.03 kB / 0.8738 GB, free: 6.215 MB / 0.6387 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0009402/0.6443, allocations: 239.8 kB / 0.874 GB, free: 5.98 MB / 0.6387 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002773/0.6471, allocations: 1.537 MB / 0.8755 GB, free: 4.391 MB / 0.6387 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 7.04e-05/0.6472, allocations: 74 kB / 0.8756 GB, free: 4.316 MB / 0.6387 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001796/0.6473, allocations: 104 kB / 0.8757 GB, free: 4.215 MB / 0.6387 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.002185/0.6495, allocations: 1.104 MB / 0.8767 GB, free: 3.078 MB / 0.6387 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.661e-05/0.6495, allocations: 0 / 0.8767 GB, free: 3.078 MB / 0.6387 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 9.987e-05/0.6496, allocations: 36 kB / 0.8768 GB, free: 3.043 MB / 0.6387 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 4.173e-05/0.6497, allocations: 28 kB / 0.8768 GB, free: 3.016 MB / 0.6387 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002057/0.6517, allocations: 0.8822 MB / 0.8777 GB, free: 2.129 MB / 0.6387 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 0.006739/0.6585, allocations: 4.912 MB / 0.8825 GB, free: 12.93 MB / 0.6544 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0015/0.66, allocations: 0.5883 MB / 0.883 GB, free: 12.34 MB / 0.6544 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0008012/0.6608, allocations: 322.8 kB / 0.8833 GB, free: 12.02 MB / 0.6544 GB Notification: Performance of preOpt evalFunc (simulation): time 0.000779/0.6616, allocations: 0.8316 MB / 0.8841 GB, free: 11.01 MB / 0.6544 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.324e-05/0.6616, allocations: 43.12 kB / 0.8842 GB, free: 10.95 MB / 0.6544 GB Notification: Performance of pre-optimization done (n=61): time 2.465e-06/0.6616, allocations: 0 / 0.8842 GB, free: 10.95 MB / 0.6544 GB Notification: Performance of matching and sorting (n=61): time 0.00798/0.6696, allocations: 1.682 MB / 0.8858 GB, free: 9.246 MB / 0.6544 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.736e-05/0.6696, allocations: 59.91 kB / 0.8859 GB, free: 9.176 MB / 0.6544 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001984/0.6716, allocations: 1.229 MB / 0.8871 GB, free: 7.93 MB / 0.6544 GB Notification: Performance of collectPreVariables (initialization): time 0.0001082/0.6717, allocations: 37.7 kB / 0.8871 GB, free: 7.887 MB / 0.6544 GB Notification: Performance of collectInitialEqns (initialization): time 0.0006652/0.6724, allocations: 0.619 MB / 0.8877 GB, free: 7.262 MB / 0.6544 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002459/0.6726, allocations: 226 kB / 0.8879 GB, free: 7.039 MB / 0.6544 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0002448/0.6729, allocations: 158.6 kB / 0.8881 GB, free: 6.879 MB / 0.6544 GB Notification: Performance of setup shared object (initialization): time 0.0001671/0.6731, allocations: 330 kB / 0.8884 GB, free: 6.551 MB / 0.6544 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.0007422/0.6738, allocations: 292.7 kB / 0.8887 GB, free: 6.262 MB / 0.6544 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001008/0.6748, allocations: 498.2 kB / 0.8892 GB, free: 5.707 MB / 0.6544 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001623/0.6764, allocations: 0.7166 MB / 0.8899 GB, free: 4.941 MB / 0.6544 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.698e-06/0.6764, allocations: 0 / 0.8899 GB, free: 4.941 MB / 0.6544 GB Notification: Performance of matching and sorting (n=88) (initialization): time 0.005235/0.6817, allocations: 1.274 MB / 0.8911 GB, free: 3.656 MB / 0.6544 GB Notification: Performance of prepare postOptimizeDAE: time 2.38e-05/0.6817, allocations: 8 kB / 0.8911 GB, free: 3.648 MB / 0.6544 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.282e-05/0.6817, allocations: 7.984 kB / 0.8911 GB, free: 3.641 MB / 0.6544 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0006559/0.6824, allocations: 137 kB / 0.8913 GB, free: 3.504 MB / 0.6544 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007009/0.6831, allocations: 163.8 kB / 0.8914 GB, free: 3.344 MB / 0.6544 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0009661/0.684, allocations: 0.6967 MB / 0.8921 GB, free: 2.621 MB / 0.6544 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001155/0.6852, allocations: 119.3 kB / 0.8922 GB, free: 2.504 MB / 0.6544 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.436e-05/0.6853, allocations: 31.98 kB / 0.8922 GB, free: 2.473 MB / 0.6544 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.001228/0.6865, allocations: 0.5487 MB / 0.8928 GB, free: 1.922 MB / 0.6544 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.00092/0.6874, allocations: 495.9 kB / 0.8932 GB, free: 1.363 MB / 0.6544 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.00154/0.6889, allocations: 0.705 MB / 0.8939 GB, free: 0.6094 MB / 0.6544 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 2.725e-06/0.689, allocations: 0 / 0.8939 GB, free: 0.6094 MB / 0.6544 GB Notification: Performance of matching and sorting (n=88) (initialization_lambda0): time 0.005135/0.6941, allocations: 1.27 MB / 0.8952 GB, free: 15.33 MB / 0.67 GB Notification: Performance of prepare postOptimizeDAE: time 6.442e-05/0.6942, allocations: 11.98 kB / 0.8952 GB, free: 15.32 MB / 0.67 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 8.616e-06/0.6942, allocations: 4 kB / 0.8952 GB, free: 15.31 MB / 0.67 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0005241/0.6947, allocations: 132.9 kB / 0.8953 GB, free: 15.18 MB / 0.67 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0006329/0.6953, allocations: 159.7 kB / 0.8955 GB, free: 15.02 MB / 0.67 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.001042/0.6964, allocations: 0.7006 MB / 0.8962 GB, free: 14.3 MB / 0.67 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001088/0.6974, allocations: 103.6 kB / 0.8963 GB, free: 14.2 MB / 0.67 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 6.457e-05/0.6975, allocations: 24 kB / 0.8963 GB, free: 14.17 MB / 0.67 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 16 * 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 (79): * Single equations (assignments): 78 * 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 {(1,9)} Notification: Performance of prepare postOptimizeDAE: time 0.0002831/0.6978, allocations: 232 kB / 0.8965 GB, free: 13.94 MB / 0.67 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002805/0.6981, allocations: 147 kB / 0.8966 GB, free: 13.79 MB / 0.67 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.005085/0.7032, allocations: 1.256 MB / 0.8979 GB, free: 12.52 MB / 0.67 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.308e-05/0.7032, allocations: 4 kB / 0.8979 GB, free: 12.52 MB / 0.67 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 6.993e-06/0.7032, allocations: 4 kB / 0.8979 GB, free: 12.51 MB / 0.67 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.004419/0.7076, allocations: 1.099 MB / 0.8989 GB, free: 11.38 MB / 0.67 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.007056/0.7147, allocations: 2.614 MB / 0.9015 GB, free: 8.652 MB / 0.67 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.844e-06/0.7147, allocations: 4 kB / 0.9015 GB, free: 8.648 MB / 0.67 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.000502/0.7152, allocations: 112.3 kB / 0.9016 GB, free: 8.539 MB / 0.67 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0005067/0.7157, allocations: 132.7 kB / 0.9017 GB, free: 8.406 MB / 0.67 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.208e-05/0.7157, allocations: 23.92 kB / 0.9018 GB, free: 8.383 MB / 0.67 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.005921/0.7216, allocations: 2.583 MB / 0.9043 GB, free: 5.645 MB / 0.67 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.5e-05/0.7217, allocations: 19.88 kB / 0.9043 GB, free: 5.625 MB / 0.67 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.006517/0.7282, allocations: 1.692 MB / 0.9059 GB, free: 3.863 MB / 0.67 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0007487/0.7289, allocations: 319.9 kB / 0.9063 GB, free: 3.531 MB / 0.67 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000183/0.7291, allocations: 16 kB / 0.9063 GB, free: 3.516 MB / 0.67 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0008336/0.7299, allocations: 47.94 kB / 0.9063 GB, free: 3.469 MB / 0.67 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001431/0.7301, allocations: 64.3 kB / 0.9064 GB, free: 3.406 MB / 0.67 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.57e-05/0.7301, allocations: 35.98 kB / 0.9064 GB, free: 3.371 MB / 0.67 GB Notification: Performance of sorting global known variables: time 0.001511/0.7317, allocations: 0.8816 MB / 0.9073 GB, free: 2.488 MB / 0.67 GB Notification: Performance of sort global known variables: time 1e-07/0.7317, allocations: 0 / 0.9073 GB, free: 2.488 MB / 0.67 GB Notification: Performance of remove unused functions: time 0.00196/0.7336, allocations: 0.7251 MB / 0.908 GB, free: 1.762 MB / 0.67 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 15 * Number of states: 2 (chi.con.vol.dynBal.U,chi.eva.vol.dynBal.U) * 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 (56): * Single equations (assignments): 51 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 4 * 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 {(1,9)} Notification: Performance of Backend phase and start with SimCode phase: time 0.001004/0.7346, allocations: 462.6 kB / 0.9084 GB, free: 1.309 MB / 0.67 GB Notification: Performance of simCode: created initialization part: time 0.002863/0.7375, allocations: 1.058 MB / 0.9095 GB, free: 260 kB / 0.67 GB Notification: Performance of simCode: created event and clocks part: time 4.768e-06/0.7375, allocations: 0 / 0.9095 GB, free: 260 kB / 0.67 GB Notification: Performance of simCode: created simulation system equations: time 0.00169/0.7392, allocations: 0.5454 MB / 0.91 GB, free: 15.7 MB / 0.6856 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003838/0.743, allocations: 0.8034 MB / 0.9108 GB, free: 14.92 MB / 0.6856 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004234/0.7473, allocations: 2.301 MB / 0.913 GB, free: 12.54 MB / 0.6856 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0009032/0.7482, allocations: 1.176 MB / 0.9142 GB, free: 11.33 MB / 0.6856 GB Notification: Performance of simCode: alias equations: time 0.001155/0.7493, allocations: 307 kB / 0.9145 GB, free: 11.03 MB / 0.6856 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.000276/0.7496, allocations: 107.4 kB / 0.9146 GB, free: 10.92 MB / 0.6856 GB Notification: Performance of SimCode: time 1.392e-06/0.7496, allocations: 4 kB / 0.9146 GB, free: 10.92 MB / 0.6856 GB Notification: Performance of Templates: time 0.05726/0.8069, allocations: 32.47 MB / 0.9463 GB, free: 10.85 MB / 0.7169 GB make -j1 -f BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.makefile (rm -f BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.pipe ; mkfifo BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.pipe ; head -c 1048576 < BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.pipe >> ../files/BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.sim & ./BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y -abortSlowSimulation -alarm=480 -s cvode -lv LOG_STATS > BuildingSystems_BuildingSystems.Fluid.Chillers.Examples.Carnot_y.pipe 2>&1)