Running: ./testmodel.py --libraries=/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ --ompython_omhome=/usr Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.conf.json
loadFile("/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 7.0.1/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 7.0.1 (/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 7.0.1/package.mo)
Running command: translateModel(Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass")
translateModel(Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass")
Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Buildings 7.0.1/package.mo): time 2.305/2.305, allocations: 255 MB / 269.9 MB, free: 9.645 MB / 218.7 MB
Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001378/0.001378, allocations: 192.4 kB / 329.5 MB, free: 1.188 MB / 250.7 MB
Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 2.349/2.349, allocations: 225.6 MB / 0.6001 GB, free: 2.273 MB / 426.7 MB
Notification: Performance of loadFile(/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/converted-libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.00196/0.001959, allocations: 101.5 kB / 0.7074 GB, free: 7.973 MB / 0.5261 GB
Notification: Performance of FrontEnd - loaded program: time 0.0005173/0.0005175, allocations: 11.91 kB / 0.8242 GB, free: 124.4 MB / 0.5886 GB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.2906/0.2912, allocations: 109.1 MB / 0.9308 GB, free: 25.16 MB / 0.5886 GB
Notification: Performance of NFInst.instantiate(Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass): time 0.919/1.21, allocations: 161.2 MB / 1.088 GB, free: 13.43 MB / 0.6667 GB
Notification: Performance of NFInst.instExpressions: time 0.01216/1.222, allocations: 4.176 MB / 1.092 GB, free: 12.19 MB / 0.6667 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.001379/1.224, allocations: 20.53 kB / 1.092 GB, free: 12.18 MB / 0.6667 GB
Notification: Performance of NFTyping.typeComponents: time 0.00152/1.225, allocations: 238.9 kB / 1.093 GB, free: 12.08 MB / 0.6667 GB
Notification: Performance of NFTyping.typeBindings: time 0.005281/1.231, allocations: 0.919 MB / 1.093 GB, free: 11.69 MB / 0.6667 GB
Notification: Performance of NFTyping.typeClassSections: time 0.003459/1.234, allocations: 0.5497 MB / 1.094 GB, free: 11.56 MB / 0.6667 GB
Notification: Performance of NFFlatten.flatten: time 0.004402/1.239, allocations: 1.946 MB / 1.096 GB, free: 11.05 MB / 0.6667 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.001351/1.24, allocations: 417 kB / 1.096 GB, free: 10.9 MB / 0.6667 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.002394/1.243, allocations: 0.571 MB / 1.097 GB, free: 10.65 MB / 0.6667 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.001729/1.244, allocations: 480.2 kB / 1.097 GB, free: 10.44 MB / 0.6667 GB
Notification: Performance of NFPackage.collectConstants: time 0.0002369/1.245, allocations: 22.62 kB / 1.097 GB, free: 10.44 MB / 0.6667 GB
Notification: Performance of NFFlatten.collectFunctions: time 0.004028/1.249, allocations: 0.8109 MB / 1.098 GB, free: 10.15 MB / 0.6667 GB
Notification: Performance of NFScalarize.scalarize: time 0.000575/1.249, allocations: 206.9 kB / 1.098 GB, free: 10.05 MB / 0.6667 GB
Notification: Performance of NFVerifyModel.verify: time 0.0004211/1.25, allocations: 149.9 kB / 1.098 GB, free: 10 MB / 0.6667 GB
Notification: Performance of NFConvertDAE.convert: time 0.002711/1.252, allocations: 0.8835 MB / 1.099 GB, free: 9.535 MB / 0.6667 GB
Notification: Performance of FrontEnd - DAE generated: time 7.083e-06/1.252, allocations: 5.031 kB / 1.099 GB, free: 9.531 MB / 0.6667 GB
Notification: Performance of FrontEnd: time 4.96e-06/1.252, allocations: 7.984 kB / 1.099 GB, free: 9.523 MB / 0.6667 GB
Notification: Performance of Transformations before backend: time 1.601e-05/1.252, allocations: 0 / 1.099 GB, free: 9.523 MB / 0.6667 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 106
 * Number of variables: 106
Notification: Performance of Generate backend data structure: time 0.003124/1.256, allocations: 0.8994 MB / 1.1 GB, free: 8.824 MB / 0.6667 GB
Notification: Performance of prepare preOptimizeDAE: time 6.072e-05/1.256, allocations: 9.938 kB / 1.1 GB, free: 8.824 MB / 0.6667 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.002418/1.258, allocations: 172.9 kB / 1.1 GB, free: 8.754 MB / 0.6667 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.002092/1.26, allocations: 0.5092 MB / 1.101 GB, free: 8.402 MB / 0.6667 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 6.947e-05/1.26, allocations: 31.28 kB / 1.101 GB, free: 8.402 MB / 0.6667 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001908/1.261, allocations: 49.38 kB / 1.101 GB, free: 8.398 MB / 0.6667 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.002067/1.263, allocations: 476.1 kB / 1.101 GB, free: 8.262 MB / 0.6667 GB
Notification: Performance of preOpt findStateOrder (simulation): time 2.985e-05/1.263, allocations: 0 / 1.101 GB, free: 8.262 MB / 0.6667 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001102/1.263, allocations: 17.5 kB / 1.101 GB, free: 8.262 MB / 0.6667 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 5.541e-05/1.263, allocations: 18.44 kB / 1.101 GB, free: 8.262 MB / 0.6667 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002094/1.265, allocations: 425.9 kB / 1.102 GB, free: 8.188 MB / 0.6667 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 0.006532/1.272, allocations: 2.045 MB / 1.104 GB, free: 6.793 MB / 0.6667 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.001212/1.273, allocations: 293.4 kB / 1.104 GB, free: 6.637 MB / 0.6667 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0008234/1.274, allocations: 184.6 kB / 1.104 GB, free: 6.551 MB / 0.6667 GB
Notification: Performance of preOpt evalFunc (simulation): time 0.0005176/1.274, allocations: 198.7 kB / 1.104 GB, free: 6.344 MB / 0.6667 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.95e-05/1.274, allocations: 37.75 kB / 1.104 GB, free: 6.301 MB / 0.6667 GB
Notification: Performance of pre-optimization done (n=30): time 3.797e-06/1.274, allocations: 3.938 kB / 1.104 GB, free: 6.297 MB / 0.6667 GB
Notification: Performance of matching and sorting (n=30): time 0.003817/1.278, allocations: 0.6484 MB / 1.105 GB, free: 5.918 MB / 0.6667 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 6.248e-05/1.278, allocations: 57.78 kB / 1.105 GB, free: 5.852 MB / 0.6667 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001227/1.28, allocations: 451 kB / 1.106 GB, free: 5.574 MB / 0.6667 GB
Notification: Performance of collectPreVariables (initialization): time 0.0001458/1.28, allocations: 31.8 kB / 1.106 GB, free: 5.539 MB / 0.6667 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0004175/1.28, allocations: 279.4 kB / 1.106 GB, free: 5.289 MB / 0.6667 GB
Notification: Performance of collectInitialBindings (initialization): time 0.0002246/1.281, allocations: 112.4 kB / 1.106 GB, free: 5.191 MB / 0.6667 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 3.917e-05/1.281, allocations: 5 kB / 1.106 GB, free: 5.188 MB / 0.6667 GB
Notification: Performance of setup shared object (initialization): time 0.0002305/1.281, allocations: 358.4 kB / 1.106 GB, free: 4.84 MB / 0.6667 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0006602/1.281, allocations: 125.4 kB / 1.106 GB, free: 4.781 MB / 0.6667 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0007833/1.282, allocations: 205.3 kB / 1.107 GB, free: 4.637 MB / 0.6667 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.0007323/1.283, allocations: 158.4 kB / 1.107 GB, free: 4.562 MB / 0.6667 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 6.743e-06/1.283, allocations: 5.094 kB / 1.107 GB, free: 4.559 MB / 0.6667 GB
Notification: Performance of matching and sorting (n=37) (initialization): time 0.001829/1.285, allocations: 401.5 kB / 1.107 GB, free: 4.355 MB / 0.6667 GB
Notification: Performance of prepare postOptimizeDAE: time 0.0001378/1.285, allocations: 133.2 kB / 1.107 GB, free: 4.211 MB / 0.6667 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.276e-05/1.285, allocations: 1.125 kB / 1.107 GB, free: 4.211 MB / 0.6667 GB
Notification: Performance of postOpt tearingSystem (initialization): time 2.524e-05/1.285, allocations: 3.5 kB / 1.107 GB, free: 4.211 MB / 0.6667 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0008733/1.286, allocations: 70.66 kB / 1.107 GB, free: 4.195 MB / 0.6667 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.655e-05/1.286, allocations: 3.812 kB / 1.107 GB, free: 4.195 MB / 0.6667 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001426/1.288, allocations: 62.45 kB / 1.107 GB, free: 4.16 MB / 0.6667 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 8.329e-05/1.288, allocations: 13.03 kB / 1.107 GB, free: 4.156 MB / 0.6667 GB
Notification: Performance of prepare postOptimizeDAE: time 1.887e-05/1.288, allocations: 7.781 kB / 1.107 GB, free: 4.152 MB / 0.6667 GB
Notification: Performance of postOpt replaceHomotopyWithSimplified (initialization): time 0.00154/1.289, allocations: 338.7 kB / 1.108 GB, free: 3.996 MB / 0.6667 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.305e-05/1.289, allocations: 6.062 kB / 1.108 GB, free: 3.992 MB / 0.6667 GB
Notification: Performance of postOpt tearingSystem (initialization): time 1.125e-05/1.289, allocations: 2.156 kB / 1.108 GB, free: 3.992 MB / 0.6667 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0007748/1.29, allocations: 74.91 kB / 1.108 GB, free: 3.977 MB / 0.6667 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.779e-05/1.29, allocations: 7 kB / 1.108 GB, free: 3.973 MB / 0.6667 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001429/1.292, allocations: 53.02 kB / 1.108 GB, free: 3.945 MB / 0.6667 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 7.783e-05/1.292, allocations: 13.38 kB / 1.108 GB, free: 3.941 MB / 0.6667 GB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 6
 * 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 (37):
 * Single equations (assignments): 37
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (linear and non-linear blocks): 0
 * Torn equation systems: 0
 * Mixed (continuous/discrete) equation systems: 0
Notification: Performance of prepare postOptimizeDAE: time 0.0006972/1.292, allocations: 284.4 kB / 1.108 GB, free: 3.695 MB / 0.6667 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0002585/1.293, allocations: 55.06 kB / 1.108 GB, free: 3.664 MB / 0.6667 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.001958/1.295, allocations: 419.6 kB / 1.109 GB, free: 3.422 MB / 0.6667 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.303e-05/1.295, allocations: 7.031 kB / 1.109 GB, free: 3.418 MB / 0.6667 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 1.146e-05/1.295, allocations: 1.031 kB / 1.109 GB, free: 3.418 MB / 0.6667 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 0.001656/1.296, allocations: 451.7 kB / 1.109 GB, free: 3.105 MB / 0.6667 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.004818/1.301, allocations: 1.144 MB / 1.11 GB, free: 2.246 MB / 0.6667 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.595e-05/1.301, allocations: 6.688 kB / 1.11 GB, free: 2.242 MB / 0.6667 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0007582/1.302, allocations: 66.44 kB / 1.11 GB, free: 2.223 MB / 0.6667 GB
Notification: Performance of postOpt tearingSystem (simulation): time 0.0004056/1.303, allocations: 46.53 kB / 1.11 GB, free: 2.195 MB / 0.6667 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 5.175e-05/1.303, allocations: 11.38 kB / 1.11 GB, free: 2.188 MB / 0.6667 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.002432/1.305, allocations: 1.437 MB / 1.112 GB, free: 0.75 MB / 0.6667 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.043e-05/1.305, allocations: 6.938 kB / 1.112 GB, free: 0.7461 MB / 0.6667 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.002629/1.308, allocations: 0.7128 MB / 1.112 GB, free: 284 kB / 0.6667 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0006249/1.309, allocations: 168 kB / 1.113 GB, free: 124 kB / 0.6667 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0001434/1.309, allocations: 12.09 kB / 1.113 GB, free: 120 kB / 0.6667 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001168/1.31, allocations: 51.52 kB / 1.113 GB, free: 92 kB / 0.6667 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.000137/1.31, allocations: 22.97 kB / 1.113 GB, free: 80 kB / 0.6667 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 6.181e-05/1.31, allocations: 19.25 kB / 1.113 GB, free: 72 kB / 0.6667 GB
Notification: Performance of sorting global known variables: time 0.0008164/1.311, allocations: 310.9 kB / 1.113 GB, free: 15.88 MB / 0.6823 GB
Notification: Performance of sort global known variables: time 5.31e-07/1.311, allocations: 0 / 1.113 GB, free: 15.88 MB / 0.6823 GB
Notification: Performance of remove unused functions: time 0.002138/1.313, allocations: 311 kB / 1.113 GB, free: 15.82 MB / 0.6823 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 8
 * Number of states: 2 (vol.dynBal.U,vol.dynBal.mXi[1])
 * 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 (28):
 * Single equations (assignments): 27
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * 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: 1 {(1,100.0%) 2}
 * Non-linear torn systems: 0
Notification: Performance of Backend phase and start with SimCode phase: time 0.0007479/1.314, allocations: 192.7 kB / 1.114 GB, free: 15.69 MB / 0.6823 GB
Notification: Performance of simCode: created initialization part: time 0.002124/1.316, allocations: 0.4919 MB / 1.114 GB, free: 15.47 MB / 0.6823 GB
Notification: Performance of simCode: created event and clocks part: time 6.883e-06/1.316, allocations: 0 / 1.114 GB, free: 15.47 MB / 0.6823 GB
Notification: Performance of simCode: created simulation system equations: time 0.001009/1.317, allocations: 287.2 kB / 1.114 GB, free: 15.28 MB / 0.6823 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.003938/1.321, allocations: 311.3 kB / 1.115 GB, free: 15.12 MB / 0.6823 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.003636/1.325, allocations: 1.362 MB / 1.116 GB, free: 14.13 MB / 0.6823 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0008171/1.326, allocations: 0.9076 MB / 1.117 GB, free: 13.33 MB / 0.6823 GB
Notification: Performance of simCode: alias equations: time 0.001409/1.327, allocations: 168.6 kB / 1.117 GB, free: 13.25 MB / 0.6823 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0002814/1.327, allocations: 40.09 kB / 1.117 GB, free: 13.25 MB / 0.6823 GB
Notification: Performance of SimCode: time 1.242e-06/1.327, allocations: 0 / 1.117 GB, free: 13.25 MB / 0.6823 GB
Notification: Performance of Templates: time 0.03375/1.361, allocations: 9.662 MB / 1.126 GB, free: 8.484 MB / 0.6823 GB
make -j1 -f Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.makefile
(rm -f Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe ; mkfifo Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe ; head -c 1048576 < Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe >> ../files/Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.sim & ./Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass -abortSlowSimulation -alarm=480 -lv LOG_STATS > Buildings_7.0.0_Buildings.Fluid.MixingVolumes.Validation.MixingVolumeSteadyStateMass.pipe 2>&1)