Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent.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 11.0.0-master/package.mo", uses=false) Using package Buildings with version 11.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.0.0-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: "" <> buildModelFMU(Buildings.Airflow.Multizone.Examples.TrickleVent,fileNamePrefix="Buildings_latest_Buildings_Airflow_Multizone_Examples_TrickleVent",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Airflow.Multizone.Examples.TrickleVent,fileNamePrefix="Buildings_latest_Buildings_Airflow_Multizone_Examples_TrickleVent",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 0.0008617/0.0008619, allocations: 90.83 kB / 15.36 MB, free: 0.7383 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.005226/0.005226, allocations: 172.4 kB / 16.26 MB, free: 6.613 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.186/1.186, allocations: 223.3 MB / 240.3 MB, free: 5.336 MB / 190.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 11.0.0-master/package.mo): time 2.347/2.347, allocations: 462.6 MB / 0.7364 GB, free: 15.56 MB / 0.5919 GB Notification: Performance of FrontEnd - loaded program: time 0.0003048/0.0003048, allocations: 15.95 kB / 0.9029 GB, free: 36.28 MB / 0.7169 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.243/0.2433, allocations: 159.6 MB / 1.059 GB, free: 4.844 MB / 0.8106 GB Notification: Performance of NFInst.instantiate(Buildings.Airflow.Multizone.Examples.TrickleVent): time 0.1638/0.4071, allocations: 183.3 MB / 1.238 GB, free: 12.91 MB / 0.9981 GB Notification: Performance of NFInst.instExpressions: time 0.4975/0.9046, allocations: 16.34 MB / 1.254 GB, free: 2.758 MB / 0.9981 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.00152/0.9062, allocations: 44.47 kB / 1.254 GB, free: 2.758 MB / 0.9981 GB Notification: Performance of NFTyping.typeComponents: time 0.001371/0.9076, allocations: 0.6378 MB / 1.254 GB, free: 2.758 MB / 0.9981 GB Notification: Performance of NFTyping.typeBindings: time 0.004336/0.9119, allocations: 2.197 MB / 1.256 GB, free: 2.691 MB / 0.9981 GB Notification: Performance of NFTyping.typeClassSections: time 0.003551/0.9155, allocations: 1.789 MB / 1.258 GB, free: 2.629 MB / 0.9981 GB Notification: Performance of NFFlatten.flatten: time 0.003831/0.9193, allocations: 4.579 MB / 1.263 GB, free: 2.617 MB / 0.9981 GB Notification: Performance of NFFlatten.resolveConnections: time 0.001982/0.9213, allocations: 1.74 MB / 1.264 GB, free: 2.375 MB / 0.9981 GB Notification: Performance of NFEvalConstants.evaluate: time 0.00301/0.9243, allocations: 1.246 MB / 1.266 GB, free: 2.355 MB / 0.9981 GB Notification: Performance of NFSimplifyModel.simplify: time 0.001362/0.9257, allocations: 1.168 MB / 1.267 GB, free: 2.348 MB / 0.9981 GB Notification: Performance of NFPackage.collectConstants: time 0.000162/0.9259, allocations: 62.69 kB / 1.267 GB, free: 2.348 MB / 0.9981 GB Notification: Performance of NFFlatten.collectFunctions: time 0.003945/0.9298, allocations: 2.213 MB / 1.269 GB, free: 2.316 MB / 0.9981 GB Notification: Performance of NFScalarize.scalarize: time 0.0006084/0.9305, allocations: 0.5812 MB / 1.27 GB, free: 2.316 MB / 0.9981 GB Notification: Performance of NFVerifyModel.verify: time 0.001159/0.9316, allocations: 1.105 MB / 1.271 GB, free: 18.29 MB / 1.014 GB Notification: Performance of NFConvertDAE.convert: time 0.00495/0.9366, allocations: 3.882 MB / 1.274 GB, free: 18.04 MB / 1.014 GB Notification: Performance of FrontEnd - DAE generated: time 3.416e-06/0.9366, allocations: 7.125 kB / 1.274 GB, free: 18.04 MB / 1.014 GB Notification: Performance of FrontEnd: time 1.432e-06/0.9366, allocations: 0 / 1.274 GB, free: 18.04 MB / 1.014 GB Notification: Performance of Transformations before backend: time 4.197e-05/0.9366, allocations: 4.531 kB / 1.274 GB, free: 18.04 MB / 1.014 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 454 * Number of variables: 454 Notification: Performance of Generate backend data structure: time 0.004129/0.9408, allocations: 2.484 MB / 1.277 GB, free: 16.7 MB / 1.014 GB Notification: Performance of prepare preOptimizeDAE: time 3.57e-05/0.9408, allocations: 12.88 kB / 1.277 GB, free: 16.7 MB / 1.014 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0003215/0.9412, allocations: 257.7 kB / 1.277 GB, free: 16.65 MB / 1.014 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.003072/0.9442, allocations: 0.5702 MB / 1.278 GB, free: 16.5 MB / 1.014 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.002775/0.947, allocations: 2.775 MB / 1.28 GB, free: 16.03 MB / 1.014 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 8.266e-05/0.9471, allocations: 129.3 kB / 1.281 GB, free: 16.03 MB / 1.014 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002267/0.9473, allocations: 175 kB / 1.281 GB, free: 16.03 MB / 1.014 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.003007/0.9504, allocations: 2.057 MB / 1.283 GB, free: 15.77 MB / 1.014 GB Notification: Performance of preOpt findStateOrder (simulation): time 3.613e-05/0.9504, allocations: 6.875 kB / 1.283 GB, free: 15.76 MB / 1.014 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001616/0.9506, allocations: 82.12 kB / 1.283 GB, free: 15.76 MB / 1.014 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 6.178e-05/0.9506, allocations: 65.72 kB / 1.283 GB, free: 15.76 MB / 1.014 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002997/0.9536, allocations: 2.109 MB / 1.285 GB, free: 15.74 MB / 1.014 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 0.008822/0.9625, allocations: 8.05 MB / 1.293 GB, free: 12.44 MB / 1.014 GB Notification: Performance of preOpt comSubExp (simulation): time 0.00239/0.9649, allocations: 1.703 MB / 1.294 GB, free: 12.19 MB / 1.014 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.001076/0.966, allocations: 0.759 MB / 1.295 GB, free: 12.18 MB / 1.014 GB Notification: Performance of preOpt evalFunc (simulation): time 0.0006731/0.9666, allocations: 0.6544 MB / 1.296 GB, free: 11.52 MB / 1.014 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001359/0.968, allocations: 0.9792 MB / 1.297 GB, free: 11.43 MB / 1.014 GB Notification: Performance of pre-optimization done (n=151): time 4.228e-06/0.968, allocations: 0 / 1.297 GB, free: 11.43 MB / 1.014 GB Notification: Performance of matching and sorting (n=151): time 0.005342/0.9734, allocations: 2.7 MB / 1.299 GB, free: 10.93 MB / 1.014 GB Notification: Performance of inlineWhenForInitialization (initialization): time 0.000105/0.9735, allocations: 222.1 kB / 1.3 GB, free: 10.68 MB / 1.014 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002749/0.9762, allocations: 3.122 MB / 1.303 GB, free: 10.51 MB / 1.014 GB Notification: Performance of collectPreVariables (initialization): time 0.0001188/0.9764, allocations: 57.7 kB / 1.303 GB, free: 10.48 MB / 1.014 GB Notification: Performance of collectInitialEqns (initialization): time 0.0005375/0.9769, allocations: 0.8843 MB / 1.304 GB, free: 10.17 MB / 1.014 GB Notification: Performance of collectInitialBindings (initialization): time 0.0003579/0.9773, allocations: 0.4944 MB / 1.304 GB, free: 9.852 MB / 1.014 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001322/0.9774, allocations: 104.8 kB / 1.304 GB, free: 9.836 MB / 1.014 GB Notification: Performance of setup shared object (initialization): time 0.0001261/0.9776, allocations: 360.4 kB / 1.304 GB, free: 9.527 MB / 1.014 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.00087/0.9784, allocations: 0.5826 MB / 1.305 GB, free: 9.52 MB / 1.014 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.000995/0.9794, allocations: 0.767 MB / 1.306 GB, free: 9.367 MB / 1.014 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001888/0.9813, allocations: 1.36 MB / 1.307 GB, free: 9.273 MB / 1.014 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 3.577e-06/0.9813, allocations: 0 / 1.307 GB, free: 9.273 MB / 1.014 GB Notification: Performance of matching and sorting (n=168) (initialization): time 0.002975/0.9843, allocations: 1.762 MB / 1.309 GB, free: 9.078 MB / 1.014 GB Notification: Performance of prepare postOptimizeDAE: time 7.688e-05/0.9844, allocations: 149.8 kB / 1.309 GB, free: 8.918 MB / 1.014 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 7.724e-06/0.9844, allocations: 7.281 kB / 1.309 GB, free: 8.918 MB / 1.014 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0007017/0.9851, allocations: 141.6 kB / 1.309 GB, free: 8.891 MB / 1.014 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001194/0.9863, allocations: 317.3 kB / 1.309 GB, free: 8.887 MB / 1.014 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.003455/0.9898, allocations: 4.23 MB / 1.314 GB, free: 5.078 MB / 1.014 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001566/0.9914, allocations: 207.3 kB / 1.314 GB, free: 5.008 MB / 1.014 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.981e-05/0.9915, allocations: 48.38 kB / 1.314 GB, free: 5.008 MB / 1.014 GB Notification: Performance of prepare postOptimizeDAE: time 4.829e-06/0.9915, allocations: 2.688 kB / 1.314 GB, free: 5.008 MB / 1.014 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.002613/0.9941, allocations: 1.553 MB / 1.315 GB, free: 4.938 MB / 1.014 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 4.419e-06/0.9941, allocations: 0 / 1.315 GB, free: 4.938 MB / 1.014 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.000632/0.9948, allocations: 149.1 kB / 1.315 GB, free: 4.91 MB / 1.014 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001145/0.9959, allocations: 308.3 kB / 1.316 GB, free: 4.906 MB / 1.014 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.003355/0.9993, allocations: 4.225 MB / 1.32 GB, free: 1.094 MB / 1.014 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001429/1.001, allocations: 207.1 kB / 1.32 GB, free: 1.016 MB / 1.014 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.816e-05/1.001, allocations: 64.39 kB / 1.32 GB, free: 1.012 MB / 1.014 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 8 * Number of states: 0 () * Number of discrete variables: 15 (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,$PRE.weaDat.locTim.tNext,$whenCondition1,$whenCondition2,$whenCondition3,$whenCondition4,$whenCondition5) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (162): * Single equations (assignments): 159 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 0 * 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 {(1,2,100.0%), (1,2,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(1,2)} Notification: Performance of prepare postOptimizeDAE: time 0.000918/1.002, allocations: 0.536 MB / 1.321 GB, free: 0.8203 MB / 1.014 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002647/1.002, allocations: 189.2 kB / 1.321 GB, free: 0.7266 MB / 1.014 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.003518/1.006, allocations: 2.054 MB / 1.323 GB, free: 0.5508 MB / 1.014 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 9.778e-06/1.006, allocations: 18 kB / 1.323 GB, free: 0.5508 MB / 1.014 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 7.013e-06/1.006, allocations: 8.453 kB / 1.323 GB, free: 0.543 MB / 1.014 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.002657/1.008, allocations: 1.69 MB / 1.325 GB, free: 324 kB / 1.014 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.005527/1.014, allocations: 3.945 MB / 1.328 GB, free: 15.89 MB / 1.029 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 5.881e-06/1.014, allocations: 5.562 kB / 1.328 GB, free: 15.89 MB / 1.029 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001222/1.015, allocations: 316.6 kB / 1.329 GB, free: 15.88 MB / 1.029 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0006079/1.016, allocations: 144.7 kB / 1.329 GB, free: 15.86 MB / 1.029 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 9.11e-05/1.016, allocations: 48.08 kB / 1.329 GB, free: 15.85 MB / 1.029 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.003382/1.019, allocations: 4.229 MB / 1.333 GB, free: 12.04 MB / 1.029 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.112e-06/1.019, allocations: 0 / 1.333 GB, free: 12.04 MB / 1.029 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.004291/1.023, allocations: 2.833 MB / 1.336 GB, free: 11.72 MB / 1.029 GB Notification: Performance of postOpt removeConstants (simulation): time 0.0007804/1.024, allocations: 0.4945 MB / 1.336 GB, free: 11.51 MB / 1.029 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002272/1.024, allocations: 34.16 kB / 1.336 GB, free: 11.51 MB / 1.029 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001344/1.026, allocations: 167.1 kB / 1.336 GB, free: 11.48 MB / 1.029 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.000197/1.026, allocations: 120.2 kB / 1.337 GB, free: 11.48 MB / 1.029 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.00011/1.026, allocations: 62.69 kB / 1.337 GB, free: 11.48 MB / 1.029 GB Notification: Performance of sorting global known variables: time 0.001953/1.028, allocations: 2.359 MB / 1.339 GB, free: 11.37 MB / 1.029 GB Notification: Performance of sort global known variables: time 2.31e-07/1.028, allocations: 0 / 1.339 GB, free: 11.37 MB / 1.029 GB Notification: Performance of remove unused functions: time 0.002476/1.031, allocations: 1.139 MB / 1.34 GB, free: 11.18 MB / 1.029 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 1 * Number of states: 5 (room.dynBal.medium.Xi[1],room.dynBal.U,room.dynBal.m,tabDat_m_flow.mExc,tabDat_V_flow.mExc) * Number of discrete variables: 10 ($whenCondition5,$whenCondition4,$whenCondition3,$whenCondition2,$whenCondition1,weaDat.locTim.tNext,weaDat.conTimMin.tNext,weaDat.conTim.tNext,weaDat.eqnTim.tNext,weaDat.decAng.tNext) * Number of discrete states: 5 (weaDat.conTimMin.tNext,weaDat.decAng.tNext,weaDat.eqnTim.tNext,weaDat.conTim.tNext,weaDat.locTim.tNext) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (158): * Single equations (assignments): 150 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 5 * 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 {(1,2,100.0%), (1,2,100.0%)} * Non-linear torn systems (#iteration vars, #inner vars): 1 system {(1,3)} Notification: Performance of Backend phase and start with SimCode phase: time 0.005987/1.037, allocations: 4.085 MB / 1.344 GB, free: 10.18 MB / 1.029 GB Notification: Performance of simCode: created initialization part: time 0.004229/1.041, allocations: 2.979 MB / 1.347 GB, free: 9.469 MB / 1.029 GB Notification: Performance of simCode: created event and clocks part: time 4.268e-06/1.041, allocations: 3.344 kB / 1.347 GB, free: 9.469 MB / 1.029 GB Notification: Performance of simCode: created simulation system equations: time 0.001508/1.042, allocations: 1.185 MB / 1.348 GB, free: 9.117 MB / 1.029 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003179/1.046, allocations: 0.7163 MB / 1.349 GB, free: 9.055 MB / 1.029 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.02693/1.072, allocations: 20.14 MB / 1.368 GB, free: 13.86 MB / 1.045 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001189/1.074, allocations: 1.549 MB / 1.37 GB, free: 12.28 MB / 1.045 GB Notification: Performance of simCode: alias equations: time 0.002361/1.076, allocations: 0.6187 MB / 1.371 GB, free: 11.65 MB / 1.045 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001155/1.077, allocations: 0.878 MB / 1.371 GB, free: 10.77 MB / 1.045 GB Notification: Performance of SimCode: time 6.31e-07/1.077, allocations: 0 / 1.371 GB, free: 10.77 MB / 1.045 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.07573/1.153, allocations: 49.85 MB / 1.42 GB, free: 9.676 MB / 1.092 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0002046/1.153, allocations: 301 kB / 1.42 GB, free: 9.289 MB / 1.092 GB Notification: Performance of buildModelFMU: Generate platform static: time 2.971/4.125, allocations: 0 / 1.42 GB, free: 9.289 MB / 1.092 GB (rm -f Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent.pipe ; mkfifo Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent.pipe ; head -c 1048576 < Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent.pipe >> ../files/Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator -r=Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent_res.mat --tempDir=temp_Buildings_latest_Buildings_Airflow_Multizone_Examples_TrickleVent_fmu --startTime=0 --stopTime=2.592e+06 --timeout=50 --tolerance=1e-06 Buildings_latest_Buildings_Airflow_Multizone_Examples_TrickleVent.fmu > Buildings_latest_Buildings.Airflow.Multizone.Examples.TrickleVent.pipe 2>&1)