Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_8_Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil.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 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo", uses=false) Using package Buildings with version 8.1.4 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/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) Running command: "" <> buildModelFMU(Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil,fileNamePrefix="Buildings_8_Buildings_Examples_DualFanDualDuct_Controls_Examples_PreHeatCoil",fmuType="me",version="2.0",platforms={"static"}) "" <> buildModelFMU(Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil,fileNamePrefix="Buildings_8_Buildings_Examples_DualFanDualDuct_Controls_Examples_PreHeatCoil",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 0.001206/0.001206, allocations: 111.3 kB / 15.23 MB, free: 0.6602 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001239/0.001239, allocations: 194.2 kB / 16.13 MB, free: 6.668 MB / 14.72 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.192/1.192, allocations: 205.1 MB / 222 MB, free: 4.723 MB / 174.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 8.1.4-maint.8.1.x/package.mo): time 1.572/1.572, allocations: 292.3 MB / 0.5484 GB, free: 13.64 MB / 462.1 MB Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.001323/0.001323, allocations: 70.3 kB / 0.6709 GB, free: 26.33 MB / 0.5294 GB Notification: Performance of FrontEnd - Absyn->SCode: time 0.1669/0.1682, allocations: 114.6 MB / 0.7828 GB, free: 13.93 MB / 0.6075 GB Notification: Performance of NFInst.instantiate(Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil): time 0.004288/0.1725, allocations: 3 MB / 0.7857 GB, free: 10.91 MB / 0.6075 GB Notification: Performance of NFInst.instExpressions: time 0.001651/0.1742, allocations: 1.146 MB / 0.7868 GB, free: 9.754 MB / 0.6075 GB Notification: Performance of NFInst.updateImplicitVariability: time 0.000178/0.1744, allocations: 15.94 kB / 0.7869 GB, free: 9.738 MB / 0.6075 GB Notification: Performance of NFTyping.typeComponents: time 0.0002086/0.1746, allocations: 55.52 kB / 0.7869 GB, free: 9.684 MB / 0.6075 GB Notification: Performance of NFTyping.typeBindings: time 0.000147/0.1748, allocations: 59.52 kB / 0.787 GB, free: 9.625 MB / 0.6075 GB Notification: Performance of NFTyping.typeClassSections: time 0.0005803/0.1754, allocations: 311.6 kB / 0.7873 GB, free: 9.32 MB / 0.6075 GB Notification: Performance of NFFlatten.flatten: time 0.0005295/0.1759, allocations: 0.6405 MB / 0.7879 GB, free: 8.68 MB / 0.6075 GB Notification: Performance of NFFlatten.resolveConnections: time 0.0004654/0.1764, allocations: 447.5 kB / 0.7883 GB, free: 8.238 MB / 0.6075 GB Notification: Performance of NFEvalConstants.evaluate: time 0.0001856/0.1766, allocations: 207.1 kB / 0.7885 GB, free: 8.035 MB / 0.6075 GB Notification: Performance of NFSimplifyModel.simplify: time 0.0002014/0.1768, allocations: 222.8 kB / 0.7887 GB, free: 7.816 MB / 0.6075 GB Notification: Performance of NFPackage.collectConstants: time 5.727e-05/0.1768, allocations: 32 kB / 0.7888 GB, free: 7.785 MB / 0.6075 GB Notification: Performance of NFFlatten.collectFunctions: time 9.005e-05/0.1769, allocations: 40 kB / 0.7888 GB, free: 7.746 MB / 0.6075 GB Notification: Performance of NFScalarize.scalarize: time 8.793e-05/0.177, allocations: 103.6 kB / 0.7889 GB, free: 7.645 MB / 0.6075 GB Notification: Performance of NFVerifyModel.verify: time 0.0001727/0.1772, allocations: 242.5 kB / 0.7891 GB, free: 7.406 MB / 0.6075 GB Notification: Performance of NFConvertDAE.convert: time 0.0004994/0.1777, allocations: 0.6698 MB / 0.7898 GB, free: 6.734 MB / 0.6075 GB Notification: Performance of FrontEnd - DAE generated: time 4.559e-06/0.1777, allocations: 0 / 0.7898 GB, free: 6.734 MB / 0.6075 GB Notification: Performance of FrontEnd: time 1.002e-06/0.1777, allocations: 7.875 kB / 0.7898 GB, free: 6.727 MB / 0.6075 GB Notification: Performance of Transformations before backend: time 5.961e-06/0.1777, allocations: 0 / 0.7898 GB, free: 6.727 MB / 0.6075 GB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 113 * Number of variables: 113 Notification: Performance of Generate backend data structure: time 0.001426/0.1792, allocations: 0.8704 MB / 0.7906 GB, free: 5.801 MB / 0.6075 GB Notification: Performance of prepare preOptimizeDAE: time 3.316e-05/0.1792, allocations: 8.031 kB / 0.7906 GB, free: 5.793 MB / 0.6075 GB Notification: Performance of preOpt introduceOutputAliases (simulation): time 8.75e-05/0.1793, allocations: 86.7 kB / 0.7907 GB, free: 5.699 MB / 0.6075 GB Notification: Performance of preOpt normalInlineFunction (simulation): time 9.938e-05/0.1794, allocations: 68.19 kB / 0.7908 GB, free: 5.633 MB / 0.6075 GB Notification: Performance of preOpt evaluateParameters (simulation): time 0.0005348/0.1799, allocations: 432.6 kB / 0.7912 GB, free: 5.164 MB / 0.6075 GB Notification: Performance of preOpt simplifyIfEquations (simulation): time 3.778e-05/0.18, allocations: 45.36 kB / 0.7913 GB, free: 5.121 MB / 0.6075 GB Notification: Performance of preOpt expandDerOperator (simulation): time 6.847e-05/0.1801, allocations: 52.31 kB / 0.7913 GB, free: 5.07 MB / 0.6075 GB Notification: Performance of preOpt clockPartitioning (simulation): time 0.0009275/0.181, allocations: 0.5275 MB / 0.7918 GB, free: 4.508 MB / 0.6075 GB Notification: Performance of preOpt findStateOrder (simulation): time 1.316e-05/0.181, allocations: 8 kB / 0.7918 GB, free: 4.5 MB / 0.6075 GB Notification: Performance of preOpt replaceEdgeChange (simulation): time 4.237e-05/0.1811, allocations: 23.98 kB / 0.7918 GB, free: 4.477 MB / 0.6075 GB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.073e-05/0.1811, allocations: 12 kB / 0.7919 GB, free: 4.465 MB / 0.6075 GB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.0009171/0.182, allocations: 399.6 kB / 0.7922 GB, free: 4.074 MB / 0.6075 GB Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.001957/0.184, allocations: 1.837 MB / 0.794 GB, free: 2.16 MB / 0.6075 GB Notification: Performance of preOpt comSubExp (simulation): time 0.0008489/0.1848, allocations: 346.8 kB / 0.7944 GB, free: 1.812 MB / 0.6075 GB Notification: Performance of preOpt resolveLoops (simulation): time 0.0003789/0.1852, allocations: 168.7 kB / 0.7945 GB, free: 1.645 MB / 0.6075 GB Notification: Performance of preOpt evalFunc (simulation): time 2.914e-05/0.1853, allocations: 11.97 kB / 0.7945 GB, free: 1.633 MB / 0.6075 GB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.0004898/0.1858, allocations: 213.4 kB / 0.7947 GB, free: 1.414 MB / 0.6075 GB Notification: Performance of pre-optimization done (n=34): time 1.693e-06/0.1858, allocations: 0 / 0.7947 GB, free: 1.414 MB / 0.6075 GB Notification: Performance of matching and sorting (n=34): time 0.001148/0.1869, allocations: 474.8 kB / 0.7952 GB, free: 0.9453 MB / 0.6075 GB Notification: Performance of inlineWhenForInitialization (initialization): time 4.112e-05/0.187, allocations: 59.39 kB / 0.7952 GB, free: 0.875 MB / 0.6075 GB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0003729/0.1874, allocations: 405.3 kB / 0.7956 GB, free: 484 kB / 0.6075 GB Notification: Performance of collectPreVariables (initialization): time 4.453e-05/0.1874, allocations: 49.69 kB / 0.7957 GB, free: 428 kB / 0.6075 GB Notification: Performance of collectInitialEqns (initialization): time 0.0001574/0.1876, allocations: 248.2 kB / 0.7959 GB, free: 172 kB / 0.6075 GB Notification: Performance of collectInitialBindings (initialization): time 8.414e-05/0.1877, allocations: 94.73 kB / 0.796 GB, free: 76 kB / 0.6075 GB Notification: Performance of simplifyInitialFunctions (initialization): time 0.00016/0.1878, allocations: 114.1 kB / 0.7961 GB, free: 15.96 MB / 0.6231 GB Notification: Performance of setup shared object (initialization): time 0.0001159/0.188, allocations: 346.8 kB / 0.7964 GB, free: 15.61 MB / 0.6231 GB Notification: Performance of preBalanceInitialSystem (initialization): time 0.000411/0.1884, allocations: 161 kB / 0.7966 GB, free: 15.45 MB / 0.6231 GB Notification: Performance of partitionIndependentBlocks (initialization): time 0.0004433/0.1888, allocations: 261.9 kB / 0.7969 GB, free: 15.15 MB / 0.6231 GB Notification: Performance of analyzeInitialSystem (initialization): time 0.0007343/0.1896, allocations: 407.4 kB / 0.7972 GB, free: 14.71 MB / 0.6231 GB Notification: Performance of solveInitialSystemEqSystem (initialization): time 2.554e-06/0.1896, allocations: 0 / 0.7972 GB, free: 14.71 MB / 0.6231 GB Notification: Performance of matching and sorting (n=59) (initialization): time 0.0009945/0.1906, allocations: 0.5185 MB / 0.7977 GB, free: 14.18 MB / 0.6231 GB Notification: Performance of prepare postOptimizeDAE: time 2.936e-05/0.1906, allocations: 33.7 kB / 0.7978 GB, free: 14.14 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 5.31e-06/0.1906, allocations: 0 / 0.7978 GB, free: 14.14 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (initialization): time 1.331e-05/0.1906, allocations: 8 kB / 0.7978 GB, free: 14.13 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0003073/0.191, allocations: 71.88 kB / 0.7979 GB, free: 14.06 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.456e-05/0.191, allocations: 15.92 kB / 0.7979 GB, free: 14.04 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.0003448/0.1913, allocations: 75.61 kB / 0.7979 GB, free: 13.97 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 4.052e-05/0.1914, allocations: 20 kB / 0.798 GB, free: 13.95 MB / 0.6231 GB Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 14 * Number of states: 0 () * Number of discrete variables: 33 ($PRE.preHeatCoil.toOn.enableFire,$PRE.preHeatCoil.toOff.enableFire,preHeatCoil.stateGraphRoot.resume,preHeatCoil.stateGraphRoot.suspend,preHeatCoil.toOff.t_start,$PRE.preHeatCoil.toOff.t_start,preHeatCoil.toOff.fire,preHeatCoil.toOff.enableFire,preHeatCoil.pumOn.active,preHeatCoil.pumOn.oldActive,$PRE.preHeatCoil.pumOn.oldActive,preHeatCoil.pumOn.newActive,$PRE.preHeatCoil.pumOn.newActive,preHeatCoil.pumOn.localActive,$PRE.preHeatCoil.pumOn.localActive,preHeatCoil.stateGraphRoot.activeSteps,preHeatCoil.toOn.enableFire,preHeatCoil.pumOff.oldActive,$PRE.preHeatCoil.pumOff.oldActive,preHeatCoil.pumOff.newActive,$PRE.preHeatCoil.pumOff.newActive,preHeatCoil.pumOff.localActive,$PRE.preHeatCoil.pumOff.localActive,preHeatCoil.pumOff.active,preHeatCoil.preHeaOn.y,$PRE.preHeatCoil.preHeaOn.y,TMix.count,$PRE.TMix.count,TMix.T_start,$PRE.TMix.T_start,$whenCondition1,$whenCondition2,preHeatCoil.preHeaCoiCon.I.trigger_internal) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (58): * Single equations (assignments): 57 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * 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 0.0002042/0.1916, allocations: 205.6 kB / 0.7982 GB, free: 13.74 MB / 0.6231 GB Notification: Performance of postOpt lateInlineFunction (simulation): time 6.457e-05/0.1917, allocations: 43.47 kB / 0.7982 GB, free: 13.7 MB / 0.6231 GB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0008711/0.1925, allocations: 390.2 kB / 0.7986 GB, free: 13.31 MB / 0.6231 GB Notification: Performance of postOpt inlineArrayEqn (simulation): time 3.096e-06/0.1926, allocations: 0 / 0.7986 GB, free: 13.31 MB / 0.6231 GB Notification: Performance of postOpt constantLinearSystem (simulation): time 3.537e-06/0.1926, allocations: 4 kB / 0.7986 GB, free: 13.3 MB / 0.6231 GB Notification: Performance of postOpt simplifysemiLinear (simulation): time 4.118e-06/0.1926, allocations: 0 / 0.7986 GB, free: 13.3 MB / 0.6231 GB Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.001403/0.194, allocations: 0.949 MB / 0.7995 GB, free: 12.3 MB / 0.6231 GB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.104e-06/0.194, allocations: 0 / 0.7995 GB, free: 12.3 MB / 0.6231 GB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0002548/0.1943, allocations: 47.89 kB / 0.7995 GB, free: 12.25 MB / 0.6231 GB Notification: Performance of postOpt tearingSystem (simulation): time 2.375e-06/0.1943, allocations: 0 / 0.7995 GB, free: 12.25 MB / 0.6231 GB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 3.262e-05/0.1943, allocations: 19.97 kB / 0.7996 GB, free: 12.23 MB / 0.6231 GB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 3.307e-06/0.1943, allocations: 7.969 kB / 0.7996 GB, free: 12.22 MB / 0.6231 GB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 8.71e-07/0.1943, allocations: 4 kB / 0.7996 GB, free: 12.22 MB / 0.6231 GB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.00122/0.1955, allocations: 0.636 MB / 0.8002 GB, free: 11.56 MB / 0.6231 GB Notification: Performance of postOpt removeConstants (simulation): time 0.000134/0.1957, allocations: 148.4 kB / 0.8003 GB, free: 11.4 MB / 0.6231 GB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 5.587e-05/0.1957, allocations: 8 kB / 0.8003 GB, free: 11.39 MB / 0.6231 GB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.000313/0.1961, allocations: 31.95 kB / 0.8004 GB, free: 11.36 MB / 0.6231 GB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0001084/0.1962, allocations: 47.89 kB / 0.8004 GB, free: 11.31 MB / 0.6231 GB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.633e-05/0.1962, allocations: 11.98 kB / 0.8004 GB, free: 11.3 MB / 0.6231 GB Notification: Performance of sorting global known variables: time 0.0002483/0.1965, allocations: 267.2 kB / 0.8007 GB, free: 11.04 MB / 0.6231 GB Notification: Performance of sort global known variables: time 1.2e-07/0.1965, allocations: 0 / 0.8007 GB, free: 11.04 MB / 0.6231 GB Notification: Performance of remove unused functions: time 0.0003655/0.1968, allocations: 107.7 kB / 0.8008 GB, free: 10.93 MB / 0.6231 GB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 2 * Number of states: 1 (preHeatCoil.preHeaCoiCon.I.y) * Number of discrete variables: 20 (preHeatCoil.toOff.enableFire,preHeatCoil.pumOn.localActive,preHeatCoil.pumOff.localActive,$cse1,$cse2,$whenCondition2,$whenCondition1,TMix.T_start,TMix.count,preHeatCoil.preHeaOn.y,preHeatCoil.pumOff.active,preHeatCoil.pumOff.newActive,preHeatCoil.pumOff.oldActive,preHeatCoil.toOn.enableFire,preHeatCoil.stateGraphRoot.activeSteps,preHeatCoil.pumOn.newActive,preHeatCoil.pumOn.oldActive,preHeatCoil.pumOn.active,preHeatCoil.toOff.fire,preHeatCoil.toOff.t_start) * Number of discrete states: 4 (TMix.count,preHeatCoil.pumOff.newActive,preHeatCoil.pumOn.newActive,preHeatCoil.preHeaOn.y) * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (36): * Single equations (assignments): 31 * Array equations: 0 * Algorithm blocks: 0 * Record equations: 0 * When equations: 5 * 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 0.001491/0.1983, allocations: 1.187 MB / 0.802 GB, free: 9.715 MB / 0.6231 GB Notification: Performance of simCode: created initialization part: time 0.0008662/0.1992, allocations: 434.9 kB / 0.8024 GB, free: 9.277 MB / 0.6231 GB Notification: Performance of simCode: created event and clocks part: time 1.683e-06/0.1992, allocations: 0 / 0.8024 GB, free: 9.277 MB / 0.6231 GB Notification: Performance of simCode: created simulation system equations: time 0.0004276/0.1997, allocations: 176.7 kB / 0.8025 GB, free: 9.105 MB / 0.6231 GB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0004986/0.2002, allocations: 92.22 kB / 0.8026 GB, free: 9.02 MB / 0.6231 GB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.005489/0.2057, allocations: 4.127 MB / 0.8067 GB, free: 4.715 MB / 0.6231 GB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.000317/0.206, allocations: 0.8313 MB / 0.8075 GB, free: 3.855 MB / 0.6231 GB Notification: Performance of simCode: alias equations: time 0.0001972/0.2062, allocations: 59.36 kB / 0.8075 GB, free: 3.797 MB / 0.6231 GB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002299/0.2064, allocations: 159.4 kB / 0.8077 GB, free: 3.645 MB / 0.6231 GB Notification: Performance of SimCode: time 2.5e-07/0.2064, allocations: 0 / 0.8077 GB, free: 3.645 MB / 0.6231 GB Notification: Performance of buildModelFMU: Generate the FMI files: time 0.5666/0.7731, allocations: 8.588 MB / 0.8161 GB, free: 11.22 MB / 0.6387 GB Notification: Performance of buildModelFMU: configured platform static using cached values: time 0.0001585/0.7733, allocations: 211 kB / 0.8163 GB, free: 10.97 MB / 0.6387 GB Notification: Performance of buildModelFMU: Generate platform static: time 2.007/2.78, allocations: 2.953 kB / 0.8163 GB, free: 10.97 MB / 0.6387 GB (rm -f Buildings_8_Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil.pipe ; mkfifo Buildings_8_Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil.pipe ; head -c 1048576 < Buildings_8_Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil.pipe >> ../files/Buildings_8_Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil.sim & /home/hudson/saved_omc/OMSimulator/install/bin/OMSimulator --tempDir=temp_Buildings_8_Buildings_Examples_DualFanDualDuct_Controls_Examples_PreHeatCoil_fmu --startTime=0 --stopTime=10800 --timeout=50 --tolerance=1e-06 Buildings_8_Buildings_Examples_DualFanDualDuct_Controls_Examples_PreHeatCoil.fmu > Buildings_8_Buildings.Examples.DualFanDualDuct.Controls.Examples.PreHeatCoil.pipe 2>&1)