Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.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 9.1.3-maint.9.1.x/package.mo", uses=false)
Using package Buildings with version 9.1.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 9.1.3-maint.9.1.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: translateModel(Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides,tolerance=1e-06,outputFormat="mat",numberOfIntervals=5000,variableFilter="time|ove.oveFloSet|ove.VActSet_flow|ove.VMin_flow|ove.VCooMax_flow|ove.VSet_flow|ove.oveCooDamPos|ove.uCooDam|ove.yCooDam|ove.oveHeaDamPos|ove.uHeaDam|ove.yHeaDam",fileNamePrefix="Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides")
translateModel(Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides,tolerance=1e-06,outputFormat="mat",numberOfIntervals=5000,variableFilter="time|ove.oveFloSet|ove.VActSet_flow|ove.VMin_flow|ove.VCooMax_flow|ove.VSet_flow|ove.oveCooDamPos|ove.uCooDam|ove.yCooDam|ove.oveHeaDamPos|ove.uHeaDam|ove.yHeaDam",fileNamePrefix="Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides")
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.006672/0.006672, allocations: 97.61 kB / 15.73 MB, free: 6.047 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001295/0.001295, allocations: 194 kB / 16.67 MB, free: 5.969 MB / 14.72 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.459/1.459, allocations: 222.9 MB / 240.4 MB, free: 4.328 MB / 190.1 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Buildings 9.1.3-maint.9.1.x/package.mo): time 2.484/2.484, allocations: 390.2 MB / 0.6648 GB, free: 200 kB / 0.5137 GB
Notification: Performance of FrontEnd - loaded program: time 0.00131/0.00131, allocations: 74.75 kB / 0.9509 GB, free: 5.582 MB / 0.7169 GB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.4032/0.4045, allocations: 140.4 MB / 1.088 GB, free: 1.48 MB / 0.8419 GB
Notification: Performance of NFInst.instantiate(Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides): time 0.00334/0.4079, allocations: 1.754 MB / 1.09 GB, free: 15.71 MB / 0.8575 GB
Notification: Performance of NFInst.instExpressions: time 0.001585/0.4095, allocations: 1.147 MB / 1.091 GB, free: 14.55 MB / 0.8575 GB
Notification: Performance of NFInst.updateImplicitVariability: time 0.0001937/0.4097, allocations: 4 kB / 1.091 GB, free: 14.55 MB / 0.8575 GB
Notification: Performance of NFTyping.typeComponents: time 0.0001253/0.4098, allocations: 55.27 kB / 1.091 GB, free: 14.49 MB / 0.8575 GB
Notification: Performance of NFTyping.typeBindings: time 0.0002039/0.4101, allocations: 51.36 kB / 1.091 GB, free: 14.44 MB / 0.8575 GB
Notification: Performance of NFTyping.typeClassSections: time 0.0003828/0.4104, allocations: 187.7 kB / 1.091 GB, free: 14.26 MB / 0.8575 GB
Notification: Performance of NFFlatten.flatten: time 0.0004431/0.4109, allocations: 0.4963 MB / 1.092 GB, free: 13.76 MB / 0.8575 GB
Notification: Performance of NFFlatten.resolveConnections: time 0.0004378/0.4113, allocations: 280.5 kB / 1.092 GB, free: 13.48 MB / 0.8575 GB
Notification: Performance of NFEvalConstants.evaluate: time 0.0002149/0.4116, allocations: 199.2 kB / 1.092 GB, free: 13.29 MB / 0.8575 GB
Notification: Performance of NFSimplifyModel.simplify: time 0.0002221/0.4118, allocations: 238.9 kB / 1.092 GB, free: 13.05 MB / 0.8575 GB
Notification: Performance of NFPackage.collectConstants: time 7.236e-05/0.4119, allocations: 56 kB / 1.092 GB, free: 13 MB / 0.8575 GB
Notification: Performance of NFFlatten.collectFunctions: time 6.122e-05/0.4119, allocations: 56 kB / 1.092 GB, free: 12.94 MB / 0.8575 GB
Notification: Performance of NFScalarize.scalarize: time 9.728e-05/0.412, allocations: 127.6 kB / 1.092 GB, free: 12.82 MB / 0.8575 GB
Notification: Performance of NFVerifyModel.verify: time 0.0001881/0.4122, allocations: 238.7 kB / 1.093 GB, free: 12.58 MB / 0.8575 GB
Notification: Performance of NFConvertDAE.convert: time 0.0006316/0.4129, allocations: 0.6806 MB / 1.093 GB, free: 11.9 MB / 0.8575 GB
Notification: Performance of FrontEnd - DAE generated: time 4.318e-06/0.4129, allocations: 0 / 1.093 GB, free: 11.9 MB / 0.8575 GB
Notification: Performance of FrontEnd: time 2.074e-06/0.4129, allocations: 0 / 1.093 GB, free: 11.9 MB / 0.8575 GB
Notification: Performance of Transformations before backend: time 7.985e-06/0.4129, allocations: 4 kB / 1.093 GB, free: 11.89 MB / 0.8575 GB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 115
 * Number of variables: 115
Notification: Performance of Generate backend data structure: time 0.0014/0.4143, allocations: 0.7674 MB / 1.094 GB, free: 11.08 MB / 0.8575 GB
Notification: Performance of prepare preOptimizeDAE: time 3.939e-05/0.4144, allocations: 12.03 kB / 1.094 GB, free: 11.07 MB / 0.8575 GB
Notification: Performance of preOpt normalInlineFunction (simulation): time 9.501e-05/0.4145, allocations: 52.61 kB / 1.094 GB, free: 11.02 MB / 0.8575 GB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001177/0.4157, allocations: 496.1 kB / 1.095 GB, free: 10.48 MB / 0.8575 GB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 4.342e-05/0.4157, allocations: 37.38 kB / 1.095 GB, free: 10.45 MB / 0.8575 GB
Notification: Performance of preOpt expandDerOperator (simulation): time 6.68e-05/0.4158, allocations: 44.38 kB / 1.095 GB, free: 10.41 MB / 0.8575 GB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.001048/0.4168, allocations: 0.4979 MB / 1.095 GB, free: 9.891 MB / 0.8575 GB
Notification: Performance of preOpt findStateOrder (simulation): time 1.312e-05/0.4169, allocations: 0 / 1.095 GB, free: 9.891 MB / 0.8575 GB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 4.322e-05/0.4169, allocations: 20 kB / 1.095 GB, free: 9.871 MB / 0.8575 GB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.262e-05/0.4169, allocations: 12 kB / 1.095 GB, free: 9.859 MB / 0.8575 GB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001201/0.4181, allocations: 425.4 kB / 1.096 GB, free: 9.445 MB / 0.8575 GB
Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.001623/0.4198, allocations: 1.228 MB / 1.097 GB, free: 8.156 MB / 0.8575 GB
Notification: Performance of preOpt comSubExp (simulation): time 0.0009624/0.4207, allocations: 391.8 kB / 1.097 GB, free: 7.746 MB / 0.8575 GB
Notification: Performance of preOpt resolveLoops (simulation): time 0.0005722/0.4213, allocations: 218.5 kB / 1.097 GB, free: 7.523 MB / 0.8575 GB
Notification: Performance of preOpt evalFunc (simulation): time 3.735e-05/0.4214, allocations: 4 kB / 1.097 GB, free: 7.52 MB / 0.8575 GB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 3.506e-05/0.4214, allocations: 38.56 kB / 1.097 GB, free: 7.473 MB / 0.8575 GB
Notification: Performance of pre-optimization done (n=40): time 1.553e-06/0.4214, allocations: 3.938 kB / 1.098 GB, free: 7.469 MB / 0.8575 GB
Notification: Performance of matching and sorting (n=40): time 0.001841/0.4233, allocations: 0.5611 MB / 1.098 GB, free: 6.902 MB / 0.8575 GB
Notification: Performance of inlineWhenForInitialization (initialization): time 6.589e-05/0.4233, allocations: 106.8 kB / 1.098 GB, free: 6.773 MB / 0.8575 GB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0002623/0.4236, allocations: 286.9 kB / 1.098 GB, free: 6.488 MB / 0.8575 GB
Notification: Performance of collectPreVariables (initialization): time 2.987e-05/0.4236, allocations: 37.64 kB / 1.098 GB, free: 6.445 MB / 0.8575 GB
Notification: Performance of collectInitialEqns (initialization): time 0.0001382/0.4238, allocations: 220.6 kB / 1.099 GB, free: 6.227 MB / 0.8575 GB
Notification: Performance of collectInitialBindings (initialization): time 9.649e-05/0.4239, allocations: 130.9 kB / 1.099 GB, free: 6.098 MB / 0.8575 GB
Notification: Performance of simplifyInitialFunctions (initialization): time 0.0001357/0.424, allocations: 98.06 kB / 1.099 GB, free: 5.996 MB / 0.8575 GB
Notification: Performance of setup shared object (initialization): time 0.0001253/0.4242, allocations: 338.8 kB / 1.099 GB, free: 5.656 MB / 0.8575 GB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.0005374/0.4247, allocations: 164.7 kB / 1.099 GB, free: 5.496 MB / 0.8575 GB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.0005696/0.4253, allocations: 253.6 kB / 1.1 GB, free: 5.219 MB / 0.8575 GB
Notification: Performance of analyzeInitialSystem (initialization): time 0.00106/0.4264, allocations: 380.3 kB / 1.1 GB, free: 4.816 MB / 0.8575 GB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 4.929e-06/0.4264, allocations: 4 kB / 1.1 GB, free: 4.812 MB / 0.8575 GB
Notification: Performance of matching and sorting (n=48) (initialization): time 0.001245/0.4276, allocations: 473 kB / 1.1 GB, free: 4.344 MB / 0.8575 GB
Notification: Performance of prepare postOptimizeDAE: time 2.567e-05/0.4277, allocations: 6.344 kB / 1.1 GB, free: 4.34 MB / 0.8575 GB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.197e-05/0.4277, allocations: 7.938 kB / 1.1 GB, free: 4.332 MB / 0.8575 GB
Notification: Performance of postOpt tearingSystem (initialization): time 2.419e-05/0.4277, allocations: 7.938 kB / 1.1 GB, free: 4.324 MB / 0.8575 GB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0005048/0.4282, allocations: 95.86 kB / 1.101 GB, free: 4.23 MB / 0.8575 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 1.353e-05/0.4282, allocations: 7.938 kB / 1.101 GB, free: 4.223 MB / 0.8575 GB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.000323/0.4286, allocations: 67.73 kB / 1.101 GB, free: 4.156 MB / 0.8575 GB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 3.058e-05/0.4286, allocations: 16 kB / 1.101 GB, free: 4.141 MB / 0.8575 GB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 11
 * Number of states: 0 ()
 * Number of discrete variables: 23 (reaToInt2.y,ove.or1.y,ove.forMinFlo1.y,ove.or3.y,ove.forMinFlo.y,ove.forCooMax.y,ove.forZerFlo.y,reaToInt1.y,ove.or2.y,ove.intEqu4.y,ove.intEqu3.y,reaToInt3.y,ove.or4.y,ove.intEqu2.y,ove.intEqu1.y,ove.conInt7.y,ove.conInt6.y,ove.conInt4.y,ove.conInt3.y,ove.conInt5.y,ove.conInt2.y,ove.conInt1.y,ove.conInt.y)
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for initialization (48):
 * Single equations (assignments): 48
 * Array equations: 0
 * Algorithm blocks: 0
 * 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 0.000315/0.4289, allocations: 170.2 kB / 1.101 GB, free: 3.965 MB / 0.8575 GB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001052/0.429, allocations: 31.81 kB / 1.101 GB, free: 3.934 MB / 0.8575 GB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 9.061e-05/0.4291, allocations: 46.14 kB / 1.101 GB, free: 3.887 MB / 0.8575 GB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 6.643e-06/0.4291, allocations: 8 kB / 1.101 GB, free: 3.879 MB / 0.8575 GB
Notification: Performance of postOpt constantLinearSystem (simulation): time 1.413e-05/0.4292, allocations: 4 kB / 1.101 GB, free: 3.875 MB / 0.8575 GB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.129e-05/0.4292, allocations: 11.97 kB / 1.101 GB, free: 3.863 MB / 0.8575 GB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.0006108/0.4298, allocations: 449.1 kB / 1.101 GB, free: 3.375 MB / 0.8575 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 2.475e-06/0.4298, allocations: 4 kB / 1.101 GB, free: 3.371 MB / 0.8575 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0004029/0.4302, allocations: 79.86 kB / 1.101 GB, free: 3.293 MB / 0.8575 GB
Notification: Performance of postOpt tearingSystem (simulation): time 3.366e-06/0.4302, allocations: 4 kB / 1.101 GB, free: 3.289 MB / 0.8575 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 2.743e-05/0.4303, allocations: 11.94 kB / 1.101 GB, free: 3.277 MB / 0.8575 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 2.304e-06/0.4303, allocations: 4 kB / 1.101 GB, free: 3.273 MB / 0.8575 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 3.497e-06/0.4303, allocations: 4 kB / 1.101 GB, free: 3.27 MB / 0.8575 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.001226/0.4315, allocations: 0.6499 MB / 1.102 GB, free: 2.602 MB / 0.8575 GB
Notification: Performance of postOpt removeConstants (simulation): time 6.594e-05/0.4316, allocations: 112.8 kB / 1.102 GB, free: 2.473 MB / 0.8575 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 4.045e-05/0.4316, allocations: 11.94 kB / 1.102 GB, free: 2.461 MB / 0.8575 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.0003477/0.432, allocations: 43.95 kB / 1.102 GB, free: 2.418 MB / 0.8575 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.000155/0.4321, allocations: 55.94 kB / 1.102 GB, free: 2.363 MB / 0.8575 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 2.133e-05/0.4322, allocations: 11.98 kB / 1.102 GB, free: 2.352 MB / 0.8575 GB
Notification: Performance of sorting global known variables: time 0.0001536/0.4323, allocations: 178 kB / 1.102 GB, free: 2.176 MB / 0.8575 GB
Notification: Performance of sort global known variables: time 1e-07/0.4323, allocations: 0 / 1.102 GB, free: 2.176 MB / 0.8575 GB
Notification: Performance of remove unused functions: time 0.0004398/0.4328, allocations: 91.73 kB / 1.103 GB, free: 2.086 MB / 0.8575 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 3
 * Number of states: 0 ()
 * Number of discrete variables: 15 (ove.forZerFlo.y,ove.forCooMax.y,ove.forMinFlo.y,ove.or3.y,ove.forMinFlo1.y,ove.or1.y,reaToInt2.y,ove.intEqu3.y,ove.intEqu4.y,ove.or2.y,reaToInt1.y,ove.intEqu1.y,ove.intEqu2.y,ove.or4.y,reaToInt3.y)
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for simulation (40):
 * Single equations (assignments): 40
 * Array equations: 0
 * Algorithm blocks: 0
 * 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 Backend phase and start with SimCode phase: time 0.0001649/0.433, allocations: 127 kB / 1.103 GB, free: 1.953 MB / 0.8575 GB
Notification: Performance of simCode: created initialization part: time 0.001218/0.4342, allocations: 407.9 kB / 1.103 GB, free: 1.555 MB / 0.8575 GB
Notification: Performance of simCode: created event and clocks part: time 2.124e-06/0.4342, allocations: 0 / 1.103 GB, free: 1.555 MB / 0.8575 GB
Notification: Performance of simCode: created simulation system equations: time 0.0006316/0.4348, allocations: 243.6 kB / 1.103 GB, free: 1.316 MB / 0.8575 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.0005443/0.4354, allocations: 50.64 kB / 1.103 GB, free: 1.27 MB / 0.8575 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.001162/0.4365, allocations: 0.6917 MB / 1.104 GB, free: 0.5469 MB / 0.8575 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0003656/0.4369, allocations: 0.8115 MB / 1.105 GB, free: 15.71 MB / 0.8731 GB
Notification: Performance of simCode: alias equations: time 0.0002046/0.4371, allocations: 50.97 kB / 1.105 GB, free: 15.66 MB / 0.8731 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0001141/0.4373, allocations: 43.42 kB / 1.105 GB, free: 15.61 MB / 0.8731 GB
Notification: Performance of SimCode: time 2e-07/0.4373, allocations: 0 / 1.105 GB, free: 15.61 MB / 0.8731 GB
Notification: Performance of Templates: time 0.007916/0.4452, allocations: 3.895 MB / 1.109 GB, free: 11.79 MB / 0.8731 GB
make -j1 -f Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.makefile
(rm -f Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.pipe ; mkfifo Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.pipe ; head -c 1048576 < Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.pipe >> ../files/Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.sim & ./Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides  -abortSlowSimulation -alarm=480  -emit_protected -lv LOG_STATS > Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.pipe 2>&1)
diffSimulationResults("Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides_res.mat","/mnt/ReferenceFiles/Buildings/csv/maint_9.1.x/Buildings_Controls_OBC_ASHRAE_G36_TerminalUnits_DualDuctSnapActing_Subsequences_Validation_Overrides.csv","/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork/OpenModelicaLibraryTesting/files/Buildings_9_Buildings.Controls.OBC.ASHRAE.G36.TerminalUnits.DualDuctSnapActing.Subsequences.Validation.Overrides.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001)
Reference file matches