Running: ./testmodel.py --libraries=/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.conf.json loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.1.1-maint.8.1.x/package.mo", uses=false) loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo", uses=false) loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) Using package ModelicaServices with version 4.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Using package Modelica with version 4.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo) Using package Complex with version 4.0.0 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package Buildings with version 8.1.1 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.1.1-maint.8.1.x/package.mo) Running command: translateModel(Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos,tolerance=1e-08,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos") translateModel(Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos,tolerance=1e-08,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos") Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 8.1.1-maint.8.1.x/package.mo): time 1.629/1.629, allocations: 297.4 MB / 312.6 MB, free: 2.941 MB / 234.7 MB Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.0009998/0.001, allocations: 185.5 kB / 382.3 MB, free: 14.84 MB / 314.7 MB Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.483/1.483, allocations: 225.7 MB / 0.6617 GB, free: 7.219 MB / 490.7 MB Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0007338/0.0007338, allocations: 94.7 kB / 0.7789 GB, free: 46.75 MB / 0.5417 GB Notification: Performance of FrontEnd - loaded program: time 0.0003243/0.0003244, allocations: 12 kB / 0.9058 GB, free: 4.93 MB / 0.6198 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.6335/0.6338, allocations: 119.2 MB / 1.022 GB, free: 57.47 MB / 0.698 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos): time 0.1787/0.8126, allocations: 207.3 MB / 1.225 GB, free: 13.07 MB / 0.8073 GB Notification: Performance of NFInst.instExpressions: time 0.1055/0.9182, allocations: 87.44 MB / 1.31 GB, free: 3.273 MB / 0.8855 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.01589/0.9341, allocations: 290 kB / 1.31 GB, free: 2.988 MB / 0.8855 GB Notification: Performance of NFTyping.typeComponents: time 0.01397/0.9481, allocations: 3.866 MB / 1.314 GB, free: 15.1 MB / 0.9011 GB Notification: Performance of NFTyping.typeBindings: time 0.03307/0.9812, allocations: 9.409 MB / 1.323 GB, free: 5.656 MB / 0.9011 GB Notification: Performance of NFTyping.typeClassSections: time 0.6048/1.586, allocations: 9.929 MB / 1.333 GB, free: 62.36 MB / 0.9011 GB Notification: Performance of NFFlatten.flatten: time 0.03871/1.625, allocations: 28.78 MB / 1.361 GB, free: 62.27 MB / 0.9011 GB Notification: Performance of NFFlatten.resolveConnections: time 0.01315/1.638, allocations: 6.963 MB / 1.368 GB, free: 61.32 MB / 0.9011 GB Notification: Performance of NFEvalConstants.evaluate: time 0.01945/1.657, allocations: 7.83 MB / 1.376 GB, free: 61.28 MB / 0.9011 GB Notification: Performance of NFSimplifyModel.simplify: time 0.01461/1.672, allocations: 6.625 MB / 1.382 GB, free: 60.63 MB / 0.9011 GB Notification: Performance of NFPackage.collectConstants: time 0.004335/1.677, allocations: 401.1 kB / 1.382 GB, free: 60.63 MB / 0.9011 GB Notification: Performance of NFFlatten.collectFunctions: time 0.01579/1.692, allocations: 3.273 MB / 1.386 GB, free: 60.62 MB / 0.9011 GB Notification: Performance of NFScalarize.scalarize: time 0.008767/1.701, allocations: 3.224 MB / 1.389 GB, free: 60.18 MB / 0.9011 GB Notification: Performance of NFVerifyModel.verify: time 0.01909/1.72, allocations: 5.341 MB / 1.394 GB, free: 58.38 MB / 0.9011 GB Notification: Performance of NFConvertDAE.convert: time 0.03248/1.753, allocations: 16.3 MB / 1.41 GB, free: 53.73 MB / 0.9011 GB Notification: Performance of FrontEnd - DAE generated: time 6.221e-06/1.753, allocations: 3.281 kB / 1.41 GB, free: 53.73 MB / 0.9011 GB Notification: Performance of FrontEnd: time 2.244e-06/1.753, allocations: 0 / 1.41 GB, free: 53.73 MB / 0.9011 GB Notification: Performance of Transformations before backend: time 0.0007183/1.754, allocations: 0 / 1.41 GB, free: 53.73 MB / 0.9011 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 1234 * Number of variables: 1234 Notification: Performance of Generate backend data structure: time 0.02552/1.779, allocations: 11.13 MB / 1.421 GB, free: 47.2 MB / 0.9011 GB Notification: Performance of prepare preOptimizeDAE: time 3.967e-05/1.779, allocations: 7.031 kB / 1.421 GB, free: 47.2 MB / 0.9011 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0155/1.795, allocations: 3.218 MB / 1.424 GB, free: 45.78 MB / 0.9011 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.02512/1.82, allocations: 10.78 MB / 1.434 GB, free: 41.93 MB / 0.9011 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.003271/1.823, allocations: 1.073 MB / 1.436 GB, free: 41.69 MB / 0.9011 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.002524/1.826, allocations: 0.5583 MB / 1.436 GB, free: 41.62 MB / 0.9011 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.02141/1.847, allocations: 7.603 MB / 1.444 GB, free: 35.99 MB / 0.9011 GB Notification: Performance of preOpt findStateOrder (simulation): time 0.0002748/1.847, allocations: 6.906 kB / 1.444 GB, free: 35.98 MB / 0.9011 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.002085/1.85, allocations: 207.8 kB / 1.444 GB, free: 35.94 MB / 0.9011 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 0.0001295/1.85, allocations: 120 kB / 1.444 GB, free: 35.82 MB / 0.9011 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.02119/1.871, allocations: 6.265 MB / 1.45 GB, free: 31.37 MB / 0.9011 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 0.06104/1.932, allocations: 31.75 MB / 1.481 GB, free: 5.57 MB / 0.9011 GB Notification: Performance of preOpt comSubExp (simulation): time 0.01486/1.947, allocations: 5.547 MB / 1.486 GB, free: 1.59 MB / 0.9011 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.006509/1.954, allocations: 2.561 MB / 1.489 GB, free: 15.76 MB / 0.9167 GB Notification: Performance of preOpt evalFunc (simulation): time 0.02487/1.978, allocations: 10.64 MB / 1.499 GB, free: 7.621 MB / 0.9167 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 7.899e-05/1.979, allocations: 64.81 kB / 1.499 GB, free: 7.566 MB / 0.9167 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.004804/1.983, allocations: 0.594 MB / 1.5 GB, free: 7.035 MB / 0.9167 GB Notification: Performance of pre-optimization done (n=247): time 1.511e-05/1.983, allocations: 0 / 1.5 GB, free: 7.035 MB / 0.9167 GB Notification: Performance of matching and sorting (n=247): time 0.02398/2.007, allocations: 7.923 MB / 1.508 GB, free: 0.875 MB / 0.9167 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0004043/2.008, allocations: 0.8385 MB / 1.508 GB, free: 15.85 MB / 0.9323 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.02243/2.03, allocations: 10.55 MB / 1.519 GB, free: 8.379 MB / 0.9323 GB Notification: Performance of collectPreVariables (initialization): time 0.001295/2.032, allocations: 112.1 kB / 1.519 GB, free: 8.324 MB / 0.9323 GB Notification: Performance of collectInitialEqns (initialization): time 0.005247/2.037, allocations: 4.911 MB / 1.524 GB, free: 6.219 MB / 0.9323 GB Notification: Performance of collectInitialBindings (initialization): time 0.001699/2.039, allocations: 0.8674 MB / 1.525 GB, free: 5.48 MB / 0.9323 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.001035/2.04, allocations: 91.67 kB / 1.525 GB, free: 5.461 MB / 0.9323 GB Notification: Performance of setup shared object (initialization): time 0.0004364/2.04, allocations: 0.5012 MB / 1.525 GB, free: 5.035 MB / 0.9323 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.009193/2.049, allocations: 4.07 MB / 1.529 GB, free: 2.184 MB / 0.9323 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.01142/2.061, allocations: 6.336 MB / 1.535 GB, free: 12.21 MB / 0.948 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.01955/2.08, allocations: 9.879 MB / 1.545 GB, free: 4.348 MB / 0.948 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 9.575e-05/2.081, allocations: 23.94 kB / 1.545 GB, free: 4.324 MB / 0.948 GB Notification: Performance of matching and sorting (n=662) (initialization): time 0.02858/2.109, allocations: 10.95 MB / 1.556 GB, free: 12.44 MB / 0.9636 GB Notification: Performance of prepare postOptimizeDAE: time 0.001663/2.111, allocations: 1.858 MB / 1.557 GB, free: 9.977 MB / 0.9636 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 0.0002035/2.111, allocations: 79.59 kB / 1.558 GB, free: 9.902 MB / 0.9636 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0001248/2.111, allocations: 84 kB / 1.558 GB, free: 9.82 MB / 0.9636 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.007075/2.118, allocations: 1.522 MB / 1.559 GB, free: 8.414 MB / 0.9636 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0001479/2.118, allocations: 134.4 kB / 1.559 GB, free: 8.309 MB / 0.9636 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.009984/2.128, allocations: 0.7185 MB / 1.56 GB, free: 7.672 MB / 0.9636 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.001472/2.13, allocations: 392.1 kB / 1.56 GB, free: 7.328 MB / 0.9636 GB Notification: Performance of prepare postOptimizeDAE: time 1.469e-05/2.13, allocations: 4 kB / 1.56 GB, free: 7.324 MB / 0.9636 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.01808/2.148, allocations: 8.545 MB / 1.569 GB, free: 1.547 MB / 0.9636 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 0.0002532/2.148, allocations: 67.98 kB / 1.569 GB, free: 1.48 MB / 0.9636 GB Notification: Performance of postOpt tearingSystem (initialization): time 8.929e-05/2.148, allocations: 91.98 kB / 1.569 GB, free: 1.391 MB / 0.9636 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.006117/2.155, allocations: 1.388 MB / 1.57 GB, free: 124 kB / 0.9636 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.0001357/2.155, allocations: 119.9 kB / 1.57 GB, free: 28 kB / 0.9636 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.009391/2.164, allocations: 0.6373 MB / 1.571 GB, free: 15.47 MB / 0.9792 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.001505/2.166, allocations: 355.1 kB / 1.571 GB, free: 15.16 MB / 0.9792 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 266 * 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 (587): * Single equations (assignments): 557 * Array equations: 20 * Algorithm blocks: 0 * Record equations: 10 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of prepare postOptimizeDAE: time 0.006913/2.173, allocations: 2.311 MB / 1.573 GB, free: 13.89 MB / 0.9792 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.003148/2.176, allocations: 0.9292 MB / 1.574 GB, free: 12.95 MB / 0.9792 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.02079/2.197, allocations: 7.008 MB / 1.581 GB, free: 7.695 MB / 0.9792 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 6.622e-05/2.197, allocations: 38.11 kB / 1.581 GB, free: 7.66 MB / 0.9792 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 1.978e-05/2.197, allocations: 3.938 kB / 1.581 GB, free: 7.656 MB / 0.9792 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 7.127e-05/2.197, allocations: 15.94 kB / 1.581 GB, free: 7.641 MB / 0.9792 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 postOpt removeSimpleEquations (simulation): time 0.04132/2.238, allocations: 13.46 MB / 1.594 GB, free: 11.64 MB / 0.9948 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.069e-05/2.238, allocations: 0 / 1.594 GB, free: 11.64 MB / 0.9948 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.004999/2.243, allocations: 0.9014 MB / 1.595 GB, free: 10.77 MB / 0.9948 GB Notification: Performance of postOpt tearingSystem (simulation): time 4.582e-05/2.243, allocations: 12 kB / 1.595 GB, free: 10.76 MB / 0.9948 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.000706/2.244, allocations: 115.9 kB / 1.595 GB, free: 10.64 MB / 0.9948 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 3.26e-05/2.244, allocations: 16 kB / 1.595 GB, free: 10.63 MB / 0.9948 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.767e-06/2.244, allocations: 3.656 kB / 1.595 GB, free: 10.63 MB / 0.9948 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.02678/2.271, allocations: 9.493 MB / 1.605 GB, free: 1.035 MB / 0.9948 GB Notification: Performance of postOpt removeConstants (simulation): time 0.007975/2.279, allocations: 1.566 MB / 1.606 GB, free: 15.44 MB / 1.01 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.004235/2.283, allocations: 68 kB / 1.606 GB, free: 15.37 MB / 1.01 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.008994/2.292, allocations: 0.667 MB / 1.607 GB, free: 14.7 MB / 1.01 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0008498/2.293, allocations: 193.3 kB / 1.607 GB, free: 14.52 MB / 1.01 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0009969/2.294, allocations: 155.8 kB / 1.607 GB, free: 14.36 MB / 1.01 GB Notification: Performance of sorting global known variables: time 0.01935/2.314, allocations: 7.148 MB / 1.614 GB, free: 7.246 MB / 1.01 GB Notification: Performance of sort global known variables: time 6.41e-07/2.314, allocations: 0 / 1.614 GB, free: 7.246 MB / 1.01 GB Notification: Performance of remove unused functions: time 0.02291/2.336, allocations: 4.037 MB / 1.618 GB, free: 3.203 MB / 1.01 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 5 * Number of states: 20 (pump1.filter.x[1],pump1.filter.x[2],pump2.filter.x[1],pump2.filter.x[2],pump3.filter.x[1],pump3.filter.x[2],pump4.filter.x[1],pump4.filter.x[2],pump5.filter.x[1],pump5.filter.x[2],forcedPump1.filter.x[1],forcedPump1.filter.x[2],forcedPump2.filter.x[1],forcedPump2.filter.x[2],forcedPump3.filter.x[1],forcedPump3.filter.x[2],forcedPump4.filter.x[1],forcedPump4.filter.x[2],forcedPump5.filter.x[1],forcedPump5.filter.x[2]) * 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 (304): * Single equations (assignments): 282 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 22 * When equations: 0 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 0 * Mixed (continuous/discrete) equation systems: 0 Notification: Performance of Backend phase and start with SimCode phase: time 0.004388/2.341, allocations: 1.137 MB / 1.619 GB, free: 2.18 MB / 1.01 GB Notification: Performance of simCode: created initialization part: time 0.03106/2.372, allocations: 12.79 MB / 1.632 GB, free: 5.633 MB / 1.026 GB Notification: Performance of simCode: created event and clocks part: time 1.712e-05/2.372, allocations: 4 kB / 1.632 GB, free: 5.629 MB / 1.026 GB Notification: Performance of simCode: created simulation system equations: time 0.008282/2.38, allocations: 2.791 MB / 1.635 GB, free: 2.891 MB / 1.026 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.03418/2.415, allocations: 4.693 MB / 1.639 GB, free: 14.23 MB / 1.042 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.0476/2.462, allocations: 21.29 MB / 1.66 GB, free: 8.902 MB / 1.057 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0102/2.473, allocations: 5.05 MB / 1.665 GB, free: 3.816 MB / 1.057 GB Notification: Performance of simCode: alias equations: time 0.0175/2.49, allocations: 2.643 MB / 1.667 GB, free: 1.176 MB / 1.057 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.004511/2.495, allocations: 0.7569 MB / 1.668 GB, free: 428 kB / 1.057 GB Notification: Performance of SimCode: time 1.232e-06/2.495, allocations: 0 / 1.668 GB, free: 428 kB / 1.057 GB Notification: Performance of Templates: time 1.241/3.736, allocations: 186 MB / 1.85 GB, free: 388.8 MB / 1.12 GB make -j1 -f Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.makefile (rm -f Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.pipe ; mkfifo Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.pipe ; head -c 1048576 < Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.pipe >> ../files/Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.sim & ./Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_8_Buildings.Fluid.Movers.Validation.Pump_Nrpm_stratos.pipe 2>&1)