Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements.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/Buildings 10.1.1-maint.10.0.x/package.mo", uses=false) Using package Buildings with version 10.1.1 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 10.1.1-maint.10.0.x/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: "" <> buildModelFMU(Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements,fileNamePrefix="Buildings_10_Buildings_ThermalZones_ReducedOrder_Examples_SimpleRoomTwoElements",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements,fileNamePrefix="Buildings_10_Buildings_ThermalZones_ReducedOrder_Examples_SimpleRoomTwoElements",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.004651/0.004651, allocations: 98.27 kB / 15.73 MB, free: 6.004 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001234/0.001234, allocations: 197.6 kB / 16.67 MB, free: 5.922 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.231/1.231, allocations: 222.9 MB / 240.4 MB, free: 4.16 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 10.1.1-maint.10.0.x/package.mo): time 2.31/2.31, allocations: 437.1 MB / 0.7106 GB, free: 4.902 MB / 0.5606 GB Notification: Performance of FrontEnd - loaded program: time 0.001666/0.001666, allocations: 59.91 kB / 1.018 GB, free: 15.04 MB / 0.7794 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2273/0.229, allocations: 151.6 MB / 1.166 GB, free: 7.293 MB / 0.92 GB Notification: Performance of NFInst.instantiate(Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements): time 0.5837/0.8127, allocations: 162.6 MB / 1.325 GB, free: 7.027 MB / 1.014 GB Notification: Performance of NFInst.instExpressions: time 0.0294/0.8422, allocations: 27.1 MB / 1.351 GB, free: 3.277 MB / 1.029 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00207/0.8443, allocations: 73.44 kB / 1.352 GB, free: 3.254 MB / 1.029 GB Notification: Performance of NFTyping.typeComponents: time 0.00168/0.846, allocations: 1.075 MB / 1.353 GB, free: 2.801 MB / 1.029 GB Notification: Performance of NFTyping.typeBindings: time 0.003555/0.8496, allocations: 1.851 MB / 1.354 GB, free: 1.762 MB / 1.029 GB Notification: Performance of NFTyping.typeClassSections: time 0.00338/0.8529, allocations: 1.782 MB / 1.356 GB, free: 0.75 MB / 1.029 GB Notification: Performance of NFFlatten.flatten: time 0.005045/0.858, allocations: 5.544 MB / 1.362 GB, free: 14.04 MB / 1.045 GB Notification: Performance of NFFlatten.resolveConnections: time 0.004392/0.8624, allocations: 4.338 MB / 1.366 GB, free: 11.76 MB / 1.045 GB Notification: Performance of NFEvalConstants.evaluate: time 0.002708/0.8651, allocations: 2.177 MB / 1.368 GB, free: 10.52 MB / 1.045 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002607/0.8677, allocations: 2.628 MB / 1.37 GB, free: 8.855 MB / 1.045 GB Notification: Performance of NFPackage.collectConstants: time 0.0005435/0.8683, allocations: 482.2 kB / 1.371 GB, free: 8.855 MB / 1.045 GB Notification: Performance of NFFlatten.collectFunctions: time 0.00174/0.87, allocations: 1.092 MB / 1.372 GB, free: 8.543 MB / 1.045 GB Notification: Performance of NFScalarize.scalarize: time 0.0009456/0.871, allocations: 1.234 MB / 1.373 GB, free: 7.582 MB / 1.045 GB Notification: Performance of NFVerifyModel.verify: time 0.0019/0.8729, allocations: 2.221 MB / 1.375 GB, free: 5.98 MB / 1.045 GB Notification: Performance of NFConvertDAE.convert: time 0.0053/0.8782, allocations: 6.285 MB / 1.382 GB, free: 1.508 MB / 1.045 GB Notification: Performance of FrontEnd - DAE generated: time 2.745e-06/0.8782, allocations: 0 / 1.382 GB, free: 1.508 MB / 1.045 GB Notification: Performance of FrontEnd: time 1.142e-06/0.8782, allocations: 0 / 1.382 GB, free: 1.508 MB / 1.045 GB Notification: Performance of Transformations before backend: time 4.385e-05/0.8783, allocations: 0 / 1.382 GB, free: 1.508 MB / 1.045 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 851 * Number of variables: 851 Notification: Performance of Generate backend data structure: time 0.007711/0.886, allocations: 4.934 MB / 1.386 GB, free: 14.1 MB / 1.061 GB Notification: Performance of prepare preOptimizeDAE: time 3.033e-05/0.886, allocations: 10.38 kB / 1.386 GB, free: 14.1 MB / 1.061 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.000505/0.8865, allocations: 473.9 kB / 1.387 GB, free: 13.75 MB / 1.061 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.01162/0.8982, allocations: 2.813 MB / 1.39 GB, free: 12.39 MB / 1.061 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.003215/0.9014, allocations: 2.41 MB / 1.392 GB, free: 10.69 MB / 1.061 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001473/0.9016, allocations: 252.5 kB / 1.392 GB, free: 10.57 MB / 1.061 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0004152/0.902, allocations: 324.6 kB / 1.392 GB, free: 10.47 MB / 1.061 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.008955/0.9109, allocations: 5.33 MB / 1.398 GB, free: 7.41 MB / 1.061 GB Notification: Performance of preOpt findStateOrder (simulation): time 6.153e-05/0.911, allocations: 14.59 kB / 1.398 GB, free: 7.398 MB / 1.061 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0003373/0.9114, allocations: 136.1 kB / 1.398 GB, free: 7.266 MB / 1.061 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.786e-05/0.9114, allocations: 84 kB / 1.398 GB, free: 7.184 MB / 1.061 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.01339/0.9248, allocations: 6.472 MB / 1.404 GB, free: 0.6992 MB / 1.061 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 0.02176/0.9466, allocations: 15.69 MB / 1.42 GB, free: 308 kB / 1.076 GB Notification: Performance of preOpt comSubExp (simulation): time 0.009942/0.9565, allocations: 4.87 MB / 1.424 GB, free: 11.43 MB / 1.092 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.004886/0.9614, allocations: 2.576 MB / 1.427 GB, free: 8.848 MB / 1.092 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0008578/0.9623, allocations: 0.6736 MB / 1.427 GB, free: 8.043 MB / 1.092 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.005227/0.9675, allocations: 2.715 MB / 1.43 GB, free: 5.289 MB / 1.092 GB Notification: Performance of pre-optimization done (n=291): time 4.138e-06/0.9676, allocations: 0 / 1.43 GB, free: 5.289 MB / 1.092 GB Notification: Performance of matching and sorting (n=291): time 0.01788/0.9854, allocations: 8.022 MB / 1.438 GB, free: 13.15 MB / 1.107 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.0001211/0.9856, allocations: 214.2 kB / 1.438 GB, free: 12.9 MB / 1.107 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.003002/0.9886, allocations: 2.512 MB / 1.441 GB, free: 10.36 MB / 1.107 GB Notification: Performance of collectPreVariables (initialization): time 0.00021/0.9888, allocations: 81.7 kB / 1.441 GB, free: 10.28 MB / 1.107 GB Notification: Performance of collectInitialEqns (initialization): time 0.001156/0.99, allocations: 1.434 MB / 1.442 GB, free: 8.828 MB / 1.107 GB Notification: Performance of collectInitialBindings (initialization): time 0.0008444/0.9908, allocations: 0.9915 MB / 1.443 GB, free: 7.828 MB / 1.107 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0008882/0.9917, allocations: 0.5129 MB / 1.444 GB, free: 7.309 MB / 1.107 GB Notification: Performance of setup shared object (initialization): time 0.0001068/0.9918, allocations: 301.1 kB / 1.444 GB, free: 7.012 MB / 1.107 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.004496/0.9963, allocations: 2.085 MB / 1.446 GB, free: 4.922 MB / 1.107 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.004777/1.001, allocations: 2.415 MB / 1.448 GB, free: 2.422 MB / 1.107 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.009162/1.01, allocations: 4.415 MB / 1.453 GB, free: 13.92 MB / 1.123 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.31e-06/1.01, allocations: 7.938 kB / 1.453 GB, free: 13.91 MB / 1.123 GB Notification: Performance of matching and sorting (n=328) (initialization): time 0.0109/1.021, allocations: 5.214 MB / 1.458 GB, free: 8.652 MB / 1.123 GB Notification: Performance of prepare postOptimizeDAE: time 1.766e-05/1.021, allocations: 8 kB / 1.458 GB, free: 8.645 MB / 1.123 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.098e-05/1.021, allocations: 4 kB / 1.458 GB, free: 8.641 MB / 1.123 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0007628/1.022, allocations: 356.8 kB / 1.458 GB, free: 8.289 MB / 1.123 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.00357/1.026, allocations: 0.8112 MB / 1.459 GB, free: 7.477 MB / 1.123 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.005101/1.031, allocations: 4.218 MB / 1.463 GB, free: 3.121 MB / 1.123 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.003054/1.034, allocations: 0.5819 MB / 1.463 GB, free: 2.539 MB / 1.123 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.00025/1.034, allocations: 107.9 kB / 1.464 GB, free: 2.434 MB / 1.123 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 17 * Number of states: 0 () * Number of discrete variables: 32 ($PRE.intGai.nextTimeEvent,$whenCondition1,intGai.nextTimeEventScaled,$PRE.intGai.nextTimeEventScaled,intGai.nextTimeEvent,HDirTil[2].incAng.decAng.tNext,$PRE.HDirTil[2].incAng.decAng.tNext,HDirTil[1].incAng.decAng.tNext,$PRE.HDirTil[1].incAng.decAng.tNext,HDifTil[2].incAng.decAng.tNext,$PRE.HDifTil[2].incAng.decAng.tNext,HDifTil[1].incAng.decAng.tNext,$PRE.HDifTil[1].incAng.decAng.tNext,weaDat.decAng.tNext,$PRE.weaDat.decAng.tNext,weaDat.eqnTim.tNext,$PRE.weaDat.eqnTim.tNext,weaDat.conTim.tNext,$PRE.weaDat.conTim.tNext,weaDat.conTimMin.tNext,$PRE.weaDat.conTimMin.tNext,weaDat.locTim.tNext,$PRE.weaDat.locTim.tNext,$whenCondition2,$whenCondition3,$whenCondition4,$whenCondition5,$whenCondition6,$whenCondition7,$whenCondition8,$whenCondition9,$whenCondition10) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (298): * Single equations (assignments): 297 * 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): 1 system {(3,28,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 0 systems Notification: Performance of prepare postOptimizeDAE: time 0.001565/1.036, allocations: 0.9814 MB / 1.465 GB, free: 1.441 MB / 1.123 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0005027/1.036, allocations: 298.1 kB / 1.465 GB, free: 1.148 MB / 1.123 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01236/1.048, allocations: 5.909 MB / 1.471 GB, free: 11.18 MB / 1.139 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.01e-05/1.049, allocations: 35.94 kB / 1.471 GB, free: 11.14 MB / 1.139 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 9.538e-06/1.049, allocations: 4 kB / 1.471 GB, free: 11.14 MB / 1.139 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.526e-05/1.049, allocations: 15.94 kB / 1.471 GB, free: 11.12 MB / 1.139 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004316/1.053, allocations: 3.857 MB / 1.474 GB, free: 7.211 MB / 1.139 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.164e-06/1.053, allocations: 4 kB / 1.474 GB, free: 7.207 MB / 1.139 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.003386/1.056, allocations: 0.7489 MB / 1.475 GB, free: 6.457 MB / 1.139 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0009136/1.057, allocations: 390.4 kB / 1.475 GB, free: 6.066 MB / 1.139 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0002256/1.057, allocations: 83.92 kB / 1.476 GB, free: 5.984 MB / 1.139 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.006203/1.064, allocations: 6.309 MB / 1.482 GB, free: 15.38 MB / 1.154 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 9.02e-07/1.064, allocations: 0 / 1.482 GB, free: 15.38 MB / 1.154 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01611/1.08, allocations: 8.43 MB / 1.49 GB, free: 6.859 MB / 1.154 GB Notification: Performance of postOpt removeConstants (simulation): time 0.001267/1.081, allocations: 0.8731 MB / 1.491 GB, free: 5.965 MB / 1.154 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0004107/1.081, allocations: 71.94 kB / 1.491 GB, free: 5.895 MB / 1.154 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002775/1.084, allocations: 419.4 kB / 1.491 GB, free: 5.484 MB / 1.154 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0004089/1.085, allocations: 214.1 kB / 1.491 GB, free: 5.273 MB / 1.154 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0002504/1.085, allocations: 107.9 kB / 1.492 GB, free: 5.168 MB / 1.154 GB Notification: Performance of sorting global known variables: time 0.002133/1.087, allocations: 1.838 MB / 1.493 GB, free: 3.32 MB / 1.154 GB Notification: Performance of sort global known variables: time 1.4e-07/1.087, allocations: 0 / 1.493 GB, free: 3.32 MB / 1.154 GB Notification: Performance of remove unused functions: time 0.00215/1.089, allocations: 1.122 MB / 1.494 GB, free: 2.195 MB / 1.154 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 4 (thermalZoneTwoElements.volAir.dynBal.U,thermalZoneTwoElements.volAir.dynBal.m,thermalZoneTwoElements.extWallRC.thermCapExt[1].T,thermalZoneTwoElements.intWallRC.thermCapInt[1].T) * Number of discrete variables: 21 ($whenCondition10,$whenCondition9,$whenCondition8,$whenCondition7,$whenCondition6,$whenCondition5,$whenCondition4,$whenCondition3,$whenCondition2,$whenCondition1,weaDat.locTim.tNext,weaDat.conTimMin.tNext,weaDat.conTim.tNext,weaDat.eqnTim.tNext,weaDat.decAng.tNext,HDifTil[1].incAng.decAng.tNext,HDifTil[2].incAng.decAng.tNext,HDirTil[1].incAng.decAng.tNext,HDirTil[2].incAng.decAng.tNext,intGai.nextTimeEvent,intGai.nextTimeEventScaled) * Number of discrete states: 11 (intGai.nextTimeEventScaled,intGai.nextTimeEvent,HDirTil[2].incAng.decAng.tNext,HDirTil[1].incAng.decAng.tNext,HDifTil[2].incAng.decAng.tNext,HDifTil[1].incAng.decAng.tNext,weaDat.decAng.tNext,weaDat.eqnTim.tNext,weaDat.conTim.tNext,weaDat.conTimMin.tNext,weaDat.locTim.tNext) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (279): * Single equations (assignments): 265 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 11 * If-equations: 0 * Equation systems (not torn): 0 * Torn equation systems: 3 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems (#iteration vars, #inner vars, density): 2 systems {(3,25,100.0%), (1,3,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(1,2)} Notification: Performance of Backend phase and start with SimCode phase: time 0.01949/1.109, allocations: 9.966 MB / 1.504 GB, free: 8.484 MB / 1.17 GB Notification: Performance of simCode: created initialization part: time 0.01012/1.119, allocations: 5.101 MB / 1.509 GB, free: 3.344 MB / 1.17 GB Notification: Performance of simCode: created event and clocks part: time 2.634e-06/1.119, allocations: 0 / 1.509 GB, free: 3.344 MB / 1.17 GB Notification: Performance of simCode: created simulation system equations: time 0.005529/1.124, allocations: 2.938 MB / 1.512 GB, free: 384 kB / 1.17 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.002575/1.127, allocations: 0.7374 MB / 1.513 GB, free: 15.68 MB / 1.186 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.04918/1.176, allocations: 30.57 MB / 1.543 GB, free: 0.7812 MB / 1.201 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.002059/1.178, allocations: 2.526 MB / 1.545 GB, free: 14.23 MB / 1.217 GB Notification: Performance of simCode: alias equations: time 0.003113/1.181, allocations: 1.153 MB / 1.546 GB, free: 13.07 MB / 1.217 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.002203/1.184, allocations: 1.518 MB / 1.548 GB, free: 11.55 MB / 1.217 GB Notification: Performance of SimCode: time 5.21e-07/1.184, allocations: 0 / 1.548 GB, free: 11.55 MB / 1.217 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 14.94/16.13, allocations: 75.16 MB / 1.621 GB, free: 0.8477 MB / 1.279 GB Notification: Performance of buildModelFMU: Generate platform static: time 27.25/43.37, allocations: 8 kB / 1.621 GB, free: 0.8398 MB / 1.279 GB (rm -f Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements.pipe ; mkfifo Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements.pipe ; head -c 1048576 < Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements.pipe >> ../files/Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator -r=Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements_res.mat --tempDir=temp_Buildings_10_Buildings_ThermalZones_ReducedOrder_Examples_SimpleRoomTwoElements_fmu --startTime=0 --stopTime=3.1536e+07 --timeout=400 --tolerance=1e-06 Buildings_10_Buildings_ThermalZones_ReducedOrder_Examples_SimpleRoomTwoElements.fmu > Buildings_10_Buildings.ThermalZones.ReducedOrder.Examples.SimpleRoomTwoElements.pipe 2>&1)