Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.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.MassExchangers.Examples.ConstantEffectiveness,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness") translateModel(Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness") [/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 0.1306/0.1326, allocations: 80.83 MB / 0.5899 GB, free: 6.977 MB / 446.1 MB Notification: Performance of NFInst.instantiate(Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness): time 0.5145/0.6471, allocations: 211.3 MB / 0.7962 GB, free: 6.754 MB / 0.5606 GB Notification: Performance of NFInst.instExpressions: time 0.01058/0.6577, allocations: 5.895 MB / 0.802 GB, free: 1.938 MB / 0.5606 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.002201/0.66, allocations: 38.88 kB / 0.802 GB, free: 1.922 MB / 0.5606 GB Notification: Performance of NFTyping.typeComponents: time 0.00252/0.6625, allocations: 0.7565 MB / 0.8028 GB, free: 1.309 MB / 0.5606 GB Notification: Performance of NFTyping.typeBindings: time 0.007321/0.6699, allocations: 1.942 MB / 0.8047 GB, free: 15.82 MB / 0.5762 GB Notification: Performance of NFTyping.typeClassSections: time 0.00442/0.6743, allocations: 1.326 MB / 0.806 GB, free: 14.85 MB / 0.5762 GB Notification: Performance of NFFlatten.flatten: time 0.005605/0.6799, allocations: 3.286 MB / 0.8092 GB, free: 12.96 MB / 0.5762 GB Notification: Performance of NFFlatten.resolveConnections: time 0.002208/0.6822, allocations: 1.201 MB / 0.8103 GB, free: 12.09 MB / 0.5762 GB Notification: Performance of NFEvalConstants.evaluate: time 0.005478/0.6877, allocations: 2.172 MB / 0.8125 GB, free: 9.914 MB / 0.5762 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002987/0.6907, allocations: 1.21 MB / 0.8136 GB, free: 8.707 MB / 0.5762 GB Notification: Performance of NFPackage.collectConstants: time 0.0003742/0.6911, allocations: 152 kB / 0.8138 GB, free: 8.559 MB / 0.5762 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003436/0.6945, allocations: 1.704 MB / 0.8155 GB, free: 6.852 MB / 0.5762 GB Notification: Performance of NFScalarize.scalarize: time 0.0006327/0.6952, allocations: 0.5532 MB / 0.816 GB, free: 6.297 MB / 0.5762 GB Notification: Performance of NFVerifyModel.verify: time 0.001238/0.6964, allocations: 0.844 MB / 0.8168 GB, free: 5.449 MB / 0.5762 GB Notification: Performance of NFConvertDAE.convert: time 0.004214/0.7007, allocations: 2.719 MB / 0.8195 GB, free: 2.723 MB / 0.5762 GB Notification: Performance of FrontEnd - DAE generated: time 8.466e-06/0.7007, allocations: 3.938 kB / 0.8195 GB, free: 2.719 MB / 0.5762 GB Notification: Performance of FrontEnd: time 2.605e-06/0.7007, allocations: 3.938 kB / 0.8195 GB, free: 2.715 MB / 0.5762 GB Notification: Performance of Transformations before backend: time 3.781e-05/0.7007, allocations: 0 / 0.8195 GB, free: 2.715 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: 276 * Number of variables: 276 Notification: Performance of Generate backend data structure: time 0.005405/0.7062, allocations: 2.023 MB / 0.8215 GB, free: 0.6328 MB / 0.5762 GB Notification: Performance of prepare preOptimizeDAE: time 4.754e-05/0.7062, allocations: 8.031 kB / 0.8215 GB, free: 0.625 MB / 0.5762 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002886/0.7091, allocations: 0.5173 MB / 0.822 GB, free: 108 kB / 0.5762 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.001496/0.7106, allocations: 0.9486 MB / 0.8229 GB, free: 15.11 MB / 0.5919 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.000598/0.7112, allocations: 198 kB / 0.8231 GB, free: 14.92 MB / 0.5919 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001641/0.7114, allocations: 104 kB / 0.8232 GB, free: 14.82 MB / 0.5919 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003503/0.7149, allocations: 1.551 MB / 0.8247 GB, free: 13.23 MB / 0.5919 GB Notification: Performance of preOpt findStateOrder (simulation): time 2.441e-05/0.715, allocations: 9.062 kB / 0.8247 GB, free: 13.23 MB / 0.5919 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001353/0.7151, allocations: 48 kB / 0.8248 GB, free: 13.18 MB / 0.5919 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 6.673e-05/0.7152, allocations: 50.16 kB / 0.8248 GB, free: 13.13 MB / 0.5919 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.004186/0.7194, allocations: 1.843 MB / 0.8266 GB, free: 11.28 MB / 0.5919 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 0.007708/0.7271, allocations: 4.979 MB / 0.8315 GB, free: 5.938 MB / 0.5919 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002999/0.7301, allocations: 1.107 MB / 0.8325 GB, free: 4.824 MB / 0.5919 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001515/0.7316, allocations: 0.663 MB / 0.8332 GB, free: 4.156 MB / 0.5919 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0007379/0.7324, allocations: 247.7 kB / 0.8334 GB, free: 3.879 MB / 0.5919 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.884e-05/0.7325, allocations: 47.22 kB / 0.8335 GB, free: 3.824 MB / 0.5919 GB Notification: Performance of pre-optimization done (n=79): time 3.557e-06/0.7325, allocations: 0 / 0.8335 GB, free: 3.824 MB / 0.5919 GB Notification: Performance of matching and sorting (n=79): time 0.005392/0.7379, allocations: 1.945 MB / 0.8354 GB, free: 1.871 MB / 0.5919 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.322e-05/0.7379, allocations: 60.06 kB / 0.8354 GB, free: 1.801 MB / 0.5919 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001453/0.7394, allocations: 0.9644 MB / 0.8364 GB, free: 0.8164 MB / 0.5919 GB Notification: Performance of collectPreVariables (initialization): time 0.0001445/0.7395, allocations: 49.7 kB / 0.8364 GB, free: 0.7617 MB / 0.5919 GB Notification: Performance of collectInitialEqns (initialization): time 0.0004242/0.74, allocations: 0.5154 MB / 0.8369 GB, free: 244 kB / 0.5919 GB Notification: Performance of collectInitialBindings (initialization): time 0.0002966/0.7403, allocations: 276.2 kB / 0.8372 GB, free: 15.96 MB / 0.6075 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0003348/0.7406, allocations: 182.4 kB / 0.8374 GB, free: 15.78 MB / 0.6075 GB Notification: Performance of setup shared object (initialization): time 0.0001206/0.7407, allocations: 341.9 kB / 0.8377 GB, free: 15.44 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001455/0.7422, allocations: 0.602 MB / 0.8383 GB, free: 14.83 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001593/0.7438, allocations: 0.7833 MB / 0.839 GB, free: 13.99 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.002954/0.7468, allocations: 1.306 MB / 0.8403 GB, free: 12.64 MB / 0.6075 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 6.212e-06/0.7468, allocations: 4 kB / 0.8403 GB, free: 12.64 MB / 0.6075 GB Notification: Performance of matching and sorting (n=105) (initialization): time 0.003708/0.7505, allocations: 1.552 MB / 0.8418 GB, free: 11.07 MB / 0.6075 GB Notification: Performance of prepare postOptimizeDAE: time 5.75e-05/0.7506, allocations: 39.11 kB / 0.8419 GB, free: 11.03 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.298e-06/0.7506, allocations: 4 kB / 0.8419 GB, free: 11.02 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (initialization): time 2e-05/0.7506, allocations: 8 kB / 0.8419 GB, free: 11.02 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.003822/0.7545, allocations: 0.593 MB / 0.8425 GB, free: 10.42 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.004698/0.7592, allocations: 3.411 MB / 0.8458 GB, free: 6.734 MB / 0.6075 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001793/0.761, allocations: 231.9 kB / 0.846 GB, free: 6.508 MB / 0.6075 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001022/0.7611, allocations: 43.97 kB / 0.8461 GB, free: 6.465 MB / 0.6075 GB Notification: Performance of preBalanceInitialSystem (initialization_lambda0): time 0.00181/0.7629, allocations: 0.8227 MB / 0.8469 GB, free: 5.637 MB / 0.6075 GB Notification: Performance of partitionIndependentBlocks (initialization_lambda0): time 0.001464/0.7644, allocations: 0.7612 MB / 0.8476 GB, free: 4.82 MB / 0.6075 GB Notification: Performance of analyzeInitialSystem (initialization_lambda0): time 0.002665/0.7671, allocations: 1.256 MB / 0.8488 GB, free: 3.527 MB / 0.6075 GB Notification: Performance of solveInitialSystemEqSystem (initialization_lambda0): time 5.01e-06/0.7671, allocations: 4 kB / 0.8488 GB, free: 3.523 MB / 0.6075 GB Notification: Performance of matching and sorting (n=105) (initialization_lambda0): time 0.003408/0.7705, allocations: 1.497 MB / 0.8503 GB, free: 2.012 MB / 0.6075 GB Notification: Performance of prepare postOptimizeDAE: time 4.7e-05/0.7706, allocations: 37.69 kB / 0.8503 GB, free: 1.969 MB / 0.6075 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.467e-06/0.7706, allocations: 7.938 kB / 0.8503 GB, free: 1.961 MB / 0.6075 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.344e-05/0.7706, allocations: 8.688 kB / 0.8503 GB, free: 1.953 MB / 0.6075 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001407/0.772, allocations: 283.7 kB / 0.8506 GB, free: 1.676 MB / 0.6075 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.381e-05/0.772, allocations: 9.797 kB / 0.8506 GB, free: 1.668 MB / 0.6075 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001522/0.7736, allocations: 198.2 kB / 0.8508 GB, free: 1.477 MB / 0.6075 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.363e-05/0.7737, allocations: 39.98 kB / 0.8509 GB, free: 1.438 MB / 0.6075 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 12 * Number of states: 0 () * Number of discrete variables: 2 (hex.i2_w,hex.i1_w) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (104): * Single equations (assignments): 101 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 2 * Torn equation systems: 0 * 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: Performance of prepare postOptimizeDAE: time 0.0003665/0.774, allocations: 232 kB / 0.8511 GB, free: 1.203 MB / 0.6075 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002292/0.7743, allocations: 118.6 kB / 0.8512 GB, free: 1.086 MB / 0.6075 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.003533/0.7778, allocations: 1.459 MB / 0.8526 GB, free: 15.62 MB / 0.6231 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 9.528e-06/0.7778, allocations: 8 kB / 0.8526 GB, free: 15.61 MB / 0.6231 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.356e-06/0.7778, allocations: 0 / 0.8526 GB, free: 15.61 MB / 0.6231 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 9.327e-06/0.7779, allocations: 3.984 kB / 0.8526 GB, free: 15.61 MB / 0.6231 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.005185/0.7831, allocations: 2.831 MB / 0.8554 GB, free: 12.68 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.725e-06/0.7831, allocations: 4 kB / 0.8554 GB, free: 12.68 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.003246/0.7863, allocations: 0.5309 MB / 0.8559 GB, free: 12.15 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (simulation): time 1.528e-05/0.7864, allocations: 11.98 kB / 0.8559 GB, free: 12.14 MB / 0.6231 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 7.712e-05/0.7865, allocations: 27.92 kB / 0.8559 GB, free: 12.11 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.0045/0.791, allocations: 3.352 MB / 0.8592 GB, free: 8.484 MB / 0.6231 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.045e-05/0.791, allocations: 7.938 kB / 0.8592 GB, free: 8.477 MB / 0.6231 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.003877/0.7949, allocations: 1.547 MB / 0.8607 GB, free: 6.871 MB / 0.6231 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0007425/0.7957, allocations: 339.5 kB / 0.8611 GB, free: 6.52 MB / 0.6231 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001531/0.7958, allocations: 12 kB / 0.8611 GB, free: 6.508 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001347/0.7972, allocations: 167.7 kB / 0.8612 GB, free: 6.344 MB / 0.6231 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.000187/0.7974, allocations: 68.36 kB / 0.8613 GB, free: 6.273 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001131/0.7975, allocations: 43.95 kB / 0.8613 GB, free: 6.23 MB / 0.6231 GB Notification: Performance of sorting global known variables: time 0.0008687/0.7984, allocations: 0.67 MB / 0.862 GB, free: 5.551 MB / 0.6231 GB Notification: Performance of sort global known variables: time 1.1e-07/0.7984, allocations: 0 / 0.862 GB, free: 5.551 MB / 0.6231 GB Notification: Performance of remove unused functions: time 0.001698/0.8001, allocations: 0.6549 MB / 0.8626 GB, free: 4.895 MB / 0.6231 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 14 * 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 (79): * Single equations (assignments): 77 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 2 * Torn equation systems: 0 * 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: Performance of Backend phase and start with SimCode phase: time 0.0006253/0.8007, allocations: 225.4 kB / 0.8629 GB, free: 4.68 MB / 0.6231 GB Notification: Performance of simCode: created initialization part: time 0.008014/0.8087, allocations: 2.647 MB / 0.8654 GB, free: 2.008 MB / 0.6231 GB Notification: Performance of simCode: created event and clocks part: time 8.606e-06/0.8088, allocations: 384 / 0.8654 GB, free: 2.008 MB / 0.6231 GB Notification: Performance of simCode: created simulation system equations: time 0.005977/0.8148, allocations: 1.284 MB / 0.8667 GB, free: 0.7227 MB / 0.6231 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002888/0.8177, allocations: 0.6101 MB / 0.8673 GB, free: 136 kB / 0.6231 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004545/0.8223, allocations: 2.761 MB / 0.87 GB, free: 13.3 MB / 0.6387 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006297/0.8229, allocations: 1.142 MB / 0.8711 GB, free: 12.14 MB / 0.6387 GB Notification: Performance of simCode: alias equations: time 0.001827/0.8247, allocations: 408.8 kB / 0.8715 GB, free: 11.73 MB / 0.6387 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003347/0.8251, allocations: 99.39 kB / 0.8716 GB, free: 11.64 MB / 0.6387 GB Notification: Performance of SimCode: time 9.12e-07/0.8251, allocations: 0 / 0.8716 GB, free: 11.64 MB / 0.6387 GB Notification: Performance of Templates: time 0.04085/0.8659, allocations: 24.75 MB / 0.8957 GB, free: 3.207 MB / 0.6544 GB make -j1 -f Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.makefile (rm -f Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.pipe ; mkfifo Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.pipe ; head -c 1048576 < Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.pipe >> ../files/Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.sim & ./Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_3.0.0_Buildings.Fluid.MassExchangers.Examples.ConstantEffectiveness.pipe 2>&1)