Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+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/ModelicaServices 3.2.3+maint.om/package.mo", uses=false) Using package ModelicaServices with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/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 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo) Using package Buildings with version 7.0.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo) Running command: "" <> buildModelFMU(Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc,fileNamePrefix="Buildings_maint_7_0_x_Buildings_Fluid_HeatExchangers_CoolingTowers_Examples_YorkCalc",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc,fileNamePrefix="Buildings_maint_7_0_x_Buildings_Fluid_HeatExchangers_CoolingTowers_Examples_YorkCalc",fmuType="me",version="2.0",platforms={"static"}) Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 7.0.3-maint.7.0.x/package.mo): time 1.629/1.629, allocations: 251.9 MB / 266.9 MB, free: 11.08 MB / 218.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 3.2.3+maint.om/package.mo): time 0.001227/0.001227, allocations: 173.5 kB / 326.5 MB, free: 2.277 MB / 250.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.681/1.681, allocations: 205.4 MB / 0.5775 GB, free: 20.3 MB / 426.7 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 3.2.3+maint.om/package.mo): time 0.0009229/0.0009229, allocations: 103.1 kB / 0.6821 GB, free: 12.93 MB / 0.5105 GB Notification: Performance of FrontEnd - loaded program: time 0.0004875/0.0004877, allocations: 11.94 kB / 0.7963 GB, free: 135.1 MB / 0.6042 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.2268/0.2274, allocations: 106.3 MB / 0.9001 GB, free: 63.93 MB / 0.6042 GB Notification: Performance of NFInst.instantiate(Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc): time 0.05736/0.2848, allocations: 73.44 MB / 0.9719 GB, free: 6.305 MB / 0.6198 GB Notification: Performance of NFInst.instExpressions: time 0.6169/0.9018, allocations: 143.5 MB / 1.112 GB, free: 26.13 MB / 0.698 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.003162/0.905, allocations: 86.97 kB / 1.112 GB, free: 26.09 MB / 0.698 GB Notification: Performance of NFTyping.typeComponents: time 0.003083/0.9081, allocations: 1.073 MB / 1.113 GB, free: 25.87 MB / 0.698 GB Notification: Performance of NFTyping.typeBindings: time 0.008491/0.9166, allocations: 3.076 MB / 1.116 GB, free: 25.68 MB / 0.698 GB Notification: Performance of NFTyping.typeClassSections: time 0.01023/0.9268, allocations: 3.51 MB / 1.12 GB, free: 25.53 MB / 0.698 GB Notification: Performance of NFFlatten.flatten: time 0.007799/0.9346, allocations: 3.994 MB / 1.123 GB, free: 25.34 MB / 0.698 GB Notification: Performance of NFFlatten.resolveConnections: time 0.003806/0.9385, allocations: 2.191 MB / 1.126 GB, free: 24.77 MB / 0.698 GB Notification: Performance of NFEvalConstants.evaluate: time 0.004515/0.943, allocations: 1.706 MB / 1.127 GB, free: 24.23 MB / 0.698 GB Notification: Performance of NFSimplifyModel.simplify: time 0.002381/0.9454, allocations: 1.325 MB / 1.129 GB, free: 23.68 MB / 0.698 GB Notification: Performance of NFPackage.collectConstants: time 0.0003405/0.9458, allocations: 98.69 kB / 1.129 GB, free: 23.68 MB / 0.698 GB Notification: Performance of NFFlatten.collectFunctions: time 0.004615/0.9504, allocations: 1.661 MB / 1.13 GB, free: 23.33 MB / 0.698 GB Notification: Performance of NFScalarize.scalarize: time 0.0005328/0.9509, allocations: 0.5924 MB / 1.131 GB, free: 23.09 MB / 0.698 GB Notification: Performance of NFVerifyModel.verify: time 0.0008788/0.9518, allocations: 0.6039 MB / 1.131 GB, free: 22.95 MB / 0.698 GB Notification: Performance of NFConvertDAE.convert: time 0.004333/0.9562, allocations: 3.873 MB / 1.135 GB, free: 20.91 MB / 0.698 GB Notification: Performance of FrontEnd - DAE generated: time 4.328e-06/0.9562, allocations: 0 / 1.135 GB, free: 20.91 MB / 0.698 GB Notification: Performance of FrontEnd: time 2.625e-06/0.9562, allocations: 0 / 1.135 GB, free: 20.91 MB / 0.698 GB Notification: Performance of Transformations before backend: time 8.245e-05/0.9563, allocations: 0 / 1.135 GB, free: 20.91 MB / 0.698 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 540 * Number of variables: 540 Notification: Performance of Generate backend data structure: time 0.006975/0.9633, allocations: 3.223 MB / 1.138 GB, free: 18.85 MB / 0.698 GB Notification: Performance of prepare preOptimizeDAE: time 5.041e-05/0.9633, allocations: 7.812 kB / 1.138 GB, free: 18.85 MB / 0.698 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0006157/0.9639, allocations: 300.8 kB / 1.139 GB, free: 18.75 MB / 0.698 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002778/0.9667, allocations: 0.5869 MB / 1.139 GB, free: 18.48 MB / 0.698 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.005/0.9718, allocations: 2.232 MB / 1.141 GB, free: 17.44 MB / 0.698 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0001247/0.9719, allocations: 169.8 kB / 1.142 GB, free: 17.43 MB / 0.698 GB Notification: Performance of preOpt expandDerOperator (simulation): time 0.000309/0.9722, allocations: 231 kB / 1.142 GB, free: 17.43 MB / 0.698 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.00402/0.9762, allocations: 2.423 MB / 1.144 GB, free: 16.51 MB / 0.698 GB Notification: Performance of preOpt findStateOrder (simulation): time 5.212e-05/0.9763, allocations: 14.5 kB / 1.144 GB, free: 16.5 MB / 0.698 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001967/0.9765, allocations: 90.06 kB / 1.144 GB, free: 16.5 MB / 0.698 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.244e-05/0.9766, allocations: 58.22 kB / 1.144 GB, free: 16.5 MB / 0.698 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.004074/0.9807, allocations: 2.292 MB / 1.147 GB, free: 16.01 MB / 0.698 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 0.01341/0.9941, allocations: 10.09 MB / 1.156 GB, free: 9.918 MB / 0.698 GB Notification: Performance of preOpt comSubExp (simulation): time 0.002764/0.9969, allocations: 1.596 MB / 1.158 GB, free: 9.664 MB / 0.698 GB Notification: Performance of preOpt evalFunc (simulation): time 0.006158/1.003, allocations: 4.866 MB / 1.163 GB, free: 6.406 MB / 0.698 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001546/1.005, allocations: 0.8831 MB / 1.164 GB, free: 6.117 MB / 0.698 GB Notification: Performance of preOpt simplifyInStream (simulation): time 0.0008965/1.006, allocations: 171 kB / 1.164 GB, free: 6.02 MB / 0.698 GB Notification: Performance of pre-optimization done (n=149): time 4.147e-06/1.006, allocations: 0 / 1.164 GB, free: 6.02 MB / 0.698 GB Notification: Performance of matching and sorting (n=149): time 0.005202/1.011, allocations: 2.304 MB / 1.166 GB, free: 5.426 MB / 0.698 GB Notification: Performance of inlineWhenForInitialization (initialization): time 7.636e-05/1.011, allocations: 277.3 kB / 1.166 GB, free: 5.113 MB / 0.698 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002734/1.014, allocations: 2.236 MB / 1.168 GB, free: 4.426 MB / 0.698 GB Notification: Performance of collectPreVariables (initialization): time 0.0001597/1.014, allocations: 64.95 kB / 1.169 GB, free: 4.379 MB / 0.698 GB Notification: Performance of collectInitialEqns (initialization): time 0.0008594/1.015, allocations: 1.271 MB / 1.17 GB, free: 3.664 MB / 0.698 GB Notification: Performance of collectInitialBindings (initialization): time 0.000333/1.015, allocations: 0.5034 MB / 1.17 GB, free: 3.234 MB / 0.698 GB Notification: Performance of simplifyInitialFunctions (initialization): time 8.656e-05/1.015, allocations: 34 kB / 1.17 GB, free: 3.23 MB / 0.698 GB Notification: Performance of setup shared object (initialization): time 0.0001037/1.015, allocations: 378.8 kB / 1.171 GB, free: 2.883 MB / 0.698 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001252/1.016, allocations: 0.6624 MB / 1.171 GB, free: 2.438 MB / 0.698 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001555/1.018, allocations: 1.28 MB / 1.173 GB, free: 1.219 MB / 0.698 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.001403/1.019, allocations: 0.8267 MB / 1.173 GB, free: 0.6992 MB / 0.698 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 9.418e-06/1.019, allocations: 8 kB / 1.173 GB, free: 0.6914 MB / 0.698 GB Notification: Performance of matching and sorting (n=237) (initialization): time 0.005439/1.025, allocations: 2.228 MB / 1.176 GB, free: 15.01 MB / 0.7136 GB Notification: Performance of prepare postOptimizeDAE: time 0.002709/1.028, allocations: 5.335 MB / 1.181 GB, free: 9.297 MB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.008e-05/1.028, allocations: 16 kB / 1.181 GB, free: 9.281 MB / 0.7136 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0006356/1.028, allocations: 109.8 kB / 1.181 GB, free: 9.18 MB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.00195/1.03, allocations: 450.3 kB / 1.181 GB, free: 8.754 MB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002412/1.033, allocations: 2.152 MB / 1.183 GB, free: 6.582 MB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002513/1.035, allocations: 177.9 kB / 1.184 GB, free: 6.438 MB / 0.7136 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002065/1.035, allocations: 93.84 kB / 1.184 GB, free: 6.359 MB / 0.7136 GB Notification: Performance of prepare postOptimizeDAE: time 1.064e-05/1.036, allocations: 5.969 kB / 1.184 GB, free: 6.355 MB / 0.7136 GB Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.003824/1.039, allocations: 1.925 MB / 1.186 GB, free: 5 MB / 0.7136 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.607e-05/1.039, allocations: 16 kB / 1.186 GB, free: 4.984 MB / 0.7136 GB Notification: Performance of postOpt tearingSystem (initialization): time 0.0005385/1.04, allocations: 105.9 kB / 1.186 GB, free: 4.887 MB / 0.7136 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001692/1.042, allocations: 436.2 kB / 1.186 GB, free: 4.473 MB / 0.7136 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.002137/1.044, allocations: 2.145 MB / 1.188 GB, free: 2.305 MB / 0.7136 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002219/1.046, allocations: 166 kB / 1.188 GB, free: 2.172 MB / 0.7136 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000171/1.046, allocations: 93.02 kB / 1.188 GB, free: 2.098 MB / 0.7136 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 57 * Number of states: 0 () * Number of discrete variables: 9 ($whenCondition2,$whenCondition1,$PRE.weaDat.conTimMin.tNext,weaDat.conTimMin.tNext,$PRE.weaDat.conTim.tNext,weaDat.conTim.tNext,$PRE.onOffCon.y,onOffCon.y,conFan.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (228): * Single equations (assignments): 222 * Array equations: 3 * Algorithm blocks: 0 * Record equations: 1 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 1 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Equation system details: * Constant Jacobian: 0 * Linear Jacobian (size,density): 0 * Non-linear Jacobian: 1 {1} * Without analytic Jacobian: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {1 2} Notification: Performance of prepare postOptimizeDAE: time 0.001371/1.048, allocations: 0.6668 MB / 1.189 GB, free: 1.648 MB / 0.7136 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0005061/1.048, allocations: 260.7 kB / 1.189 GB, free: 1.391 MB / 0.7136 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.004797/1.053, allocations: 2.188 MB / 1.191 GB, free: 15.81 MB / 0.7292 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.374e-05/1.053, allocations: 23.95 kB / 1.192 GB, free: 15.79 MB / 0.7292 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 4.258e-06/1.053, allocations: 0 / 1.192 GB, free: 15.79 MB / 0.7292 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.003316/1.056, allocations: 1.793 MB / 1.193 GB, free: 14.39 MB / 0.7292 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.007774/1.064, allocations: 4.382 MB / 1.198 GB, free: 11.33 MB / 0.7292 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.104e-06/1.064, allocations: 0 / 1.198 GB, free: 11.33 MB / 0.7292 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.001463/1.066, allocations: 327.4 kB / 1.198 GB, free: 11.02 MB / 0.7292 GB Notification: Performance of postOpt tearingSystem (simulation): time 0.0005243/1.066, allocations: 91.53 kB / 1.198 GB, free: 10.93 MB / 0.7292 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001089/1.066, allocations: 51.22 kB / 1.198 GB, free: 10.91 MB / 0.7292 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.00175/1.068, allocations: 1.554 MB / 1.2 GB, free: 9.352 MB / 0.7292 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 4.318e-06/1.068, allocations: 3.984 kB / 1.2 GB, free: 9.348 MB / 0.7292 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.00561/1.074, allocations: 2.994 MB / 1.202 GB, free: 7.156 MB / 0.7292 GB Notification: Performance of postOpt removeConstants (simulation): time 0.001235/1.075, allocations: 0.5721 MB / 1.203 GB, free: 6.695 MB / 0.7292 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000327/1.075, allocations: 40.05 kB / 1.203 GB, free: 6.68 MB / 0.7292 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001607/1.077, allocations: 179.6 kB / 1.203 GB, free: 6.535 MB / 0.7292 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0002124/1.077, allocations: 120.4 kB / 1.203 GB, free: 6.434 MB / 0.7292 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001423/1.077, allocations: 67.52 kB / 1.203 GB, free: 6.379 MB / 0.7292 GB Notification: Performance of sorting global known variables: time 0.002107/1.079, allocations: 1.495 MB / 1.205 GB, free: 5.312 MB / 0.7292 GB Notification: Performance of sort global known variables: time 2.51e-07/1.079, allocations: 0 / 1.205 GB, free: 5.312 MB / 0.7292 GB Notification: Performance of remove unused functions: time 0.003749/1.083, allocations: 1.506 MB / 1.206 GB, free: 3.926 MB / 0.7292 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 5 * Number of states: 7 (tow.vol.dynBal.U,pum.vol.dynBal.U,pum.filter.x[1],pum.filter.x[2],vol.dynBal.U,conFan.I.y,conFan.D.x) * Number of discrete variables: 5 ($whenCondition2,$whenCondition1,weaDat.conTimMin.tNext,weaDat.conTim.tNext,onOffCon.y) * Number of discrete states: 3 (onOffCon.y,weaDat.conTimMin.tNext,weaDat.conTim.tNext) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (174): * Single equations (assignments): 165 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 6 * When equations: 2 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {1 3} Notification: Performance of Backend phase and start with SimCode phase: time 0.008042/1.091, allocations: 4.774 MB / 1.211 GB, free: 56 kB / 0.7292 GB Notification: Performance of simCode: created initialization part: time 0.006122/1.097, allocations: 3.066 MB / 1.214 GB, free: 12.96 MB / 0.7448 GB Notification: Performance of simCode: created event and clocks part: time 6.532e-06/1.097, allocations: 0 / 1.214 GB, free: 12.96 MB / 0.7448 GB Notification: Performance of simCode: created simulation system equations: time 0.001821/1.099, allocations: 0.9874 MB / 1.215 GB, free: 11.97 MB / 0.7448 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.004916/1.104, allocations: 1.136 MB / 1.216 GB, free: 10.84 MB / 0.7448 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.01522/1.119, allocations: 16.92 MB / 1.233 GB, free: 9.273 MB / 0.7605 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.001383/1.121, allocations: 1.844 MB / 1.234 GB, free: 7.398 MB / 0.7605 GB Notification: Performance of simCode: alias equations: time 0.003324/1.124, allocations: 0.7862 MB / 1.235 GB, free: 6.605 MB / 0.7605 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001608/1.126, allocations: 1.214 MB / 1.236 GB, free: 5.391 MB / 0.7605 GB Notification: Performance of SimCode: time 6.52e-07/1.126, allocations: 1.75 kB / 1.236 GB, free: 5.391 MB / 0.7605 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.1216/1.247, allocations: 74.66 MB / 1.309 GB, free: 11.29 MB / 0.8386 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001988/1.247, allocations: 277.3 kB / 1.309 GB, free: 10.93 MB / 0.8386 GB Notification: Performance of buildModelFMU: Generate platform static: time 4.696/5.944, allocations: 0 / 1.309 GB, free: 10.93 MB / 0.8386 GB (rm -f Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc.pipe ; mkfifo Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc.pipe ; head -c 1048576 < Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc.pipe >> ../files/Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc.sim & /home/hudson/saved_omc/OMSimulator/install/linux/bin/OMSimulator --tempDir=temp_Buildings_maint_7_0_x_Buildings_Fluid_HeatExchangers_CoolingTowers_Examples_YorkCalc_fmu --startTime=1.5552e+07 --stopTime=1.57248e+07 --timeout=50 --tolerance=1e-06 Buildings_maint_7_0_x_Buildings_Fluid_HeatExchangers_CoolingTowers_Examples_YorkCalc.fmu > Buildings_maint.7.0.x_Buildings.Fluid.HeatExchangers.CoolingTowers.Examples.YorkCalc.pipe 2>&1)