Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.conf.json
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/ModelicaServices 4.0.0+maint.om/package.mo", uses=false)
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ScalableTestSuite 2.0.0-master/package.mo", uses=false)
Using package ScalableTestSuite with version 2.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ScalableTestSuite 2.0.0-master/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)
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)
Running command: translateModel(ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160,tolerance=1e-06,outputFormat="mat",numberOfIntervals=5000,variableFilter="T.160.|T.1.|T.2.|T.3.|der.T.2..|der.T.3..|time|time",fileNamePrefix="ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160")
translateModel(ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160,tolerance=1e-06,outputFormat="mat",numberOfIntervals=5000,variableFilter="T.160.|T.1.|T.2.|T.3.|der.T.2..|der.T.3..|time|time",fileNamePrefix="ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160")
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001078/0.001078, allocations: 186.5 kB / 17.27 MB, free: 4.504 MB / 13.93 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 4.0.0+maint.om/package.mo): time 1.194/1.194, allocations: 222.9 MB / 240.9 MB, free: 10.98 MB / 202.7 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.001056/0.001056, allocations: 106.8 kB / 291.2 MB, free: 10.92 MB / 234.7 MB
Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ScalableTestSuite 2.0.0-master/package.mo): time 0.7244/0.7244, allocations: 119.3 MB / 460.6 MB, free: 9.559 MB / 346.7 MB
Notification: Performance of FrontEnd - loaded program: time 0.0009353/0.0009353, allocations: 51.25 kB / 0.5391 GB, free: 43.15 MB / 394.8 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.1249/0.1258, allocations: 80.69 MB / 0.6179 GB, free: 12.69 MB / 442.8 MB
Notification: Performance of NFInst.instantiate(ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160): time 0.002261/0.1282, allocations: 1.394 MB / 0.6193 GB, free: 11.29 MB / 442.8 MB
Notification: Performance of NFInst.instExpressions: time 0.0001609/0.1283, allocations: 43.86 kB / 0.6193 GB, free: 11.24 MB / 442.8 MB
Notification: Performance of NFInst.updateImplicitVariability: time 2.881e-05/0.1284, allocations: 0 / 0.6193 GB, free: 11.24 MB / 442.8 MB
Notification: Performance of NFTyping.typeComponents: time 7.553e-05/0.1285, allocations: 3.984 kB / 0.6193 GB, free: 11.24 MB / 442.8 MB
Notification: Performance of NFTyping.typeBindings: time 8.1e-05/0.1285, allocations: 19.84 kB / 0.6193 GB, free: 11.22 MB / 442.8 MB
Notification: Performance of NFTyping.typeClassSections: time 0.0001137/0.1287, allocations: 11.98 kB / 0.6194 GB, free: 11.21 MB / 442.8 MB
Notification: Performance of NFFlatten.flatten: time 0.001544/0.1302, allocations: 2.103 MB / 0.6214 GB, free: 9.102 MB / 442.8 MB
Notification: Performance of NFFlatten.resolveConnections: time 4.715e-05/0.1303, allocations: 8 kB / 0.6214 GB, free: 9.094 MB / 442.8 MB
Notification: Performance of NFEvalConstants.evaluate: time 0.0006084/0.1309, allocations: 0.7336 MB / 0.6221 GB, free: 8.359 MB / 442.8 MB
Notification: Performance of NFSimplifyModel.simplify: time 0.001501/0.1324, allocations: 1.185 MB / 0.6233 GB, free: 7.172 MB / 442.8 MB
Notification: Performance of NFPackage.collectConstants: time 0.0002678/0.1327, allocations: 128 kB / 0.6234 GB, free: 7.047 MB / 442.8 MB
Notification: Performance of NFFlatten.collectFunctions: time 0.0002583/0.1329, allocations: 132 kB / 0.6235 GB, free: 6.918 MB / 442.8 MB
Notification: Performance of NFScalarize.scalarize: time 0.0004534/0.1334, allocations: 0.6158 MB / 0.6241 GB, free: 6.301 MB / 442.8 MB
Notification: Performance of NFVerifyModel.verify: time 0.0006958/0.1341, allocations: 0.6388 MB / 0.6248 GB, free: 5.66 MB / 442.8 MB
Notification: Performance of NFConvertDAE.convert: time 0.0009519/0.1351, allocations: 1.177 MB / 0.6259 GB, free: 4.48 MB / 442.8 MB
Notification: Performance of FrontEnd - DAE generated: time 5.58e-06/0.1351, allocations: 0 / 0.6259 GB, free: 4.48 MB / 442.8 MB
Notification: Performance of FrontEnd: time 7.02e-07/0.1351, allocations: 0 / 0.6259 GB, free: 4.48 MB / 442.8 MB
Notification: Performance of Transformations before backend: time 1.062e-05/0.1351, allocations: 0 / 0.6259 GB, free: 4.48 MB / 442.8 MB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 160
 * Number of variables: 160
Notification: Performance of Generate backend data structure: time 0.01456/0.1497, allocations: 4.589 MB / 0.6304 GB, free: 15.83 MB / 458.8 MB
Notification: Performance of prepare preOptimizeDAE: time 6.064e-05/0.1497, allocations: 12.03 kB / 0.6304 GB, free: 15.82 MB / 458.8 MB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.0002271/0.15, allocations: 88.28 kB / 0.6305 GB, free: 15.73 MB / 458.8 MB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.0009237/0.1509, allocations: 439.4 kB / 0.6309 GB, free: 15.26 MB / 458.8 MB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 5.28e-05/0.151, allocations: 85.69 kB / 0.631 GB, free: 15.18 MB / 458.8 MB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0002871/0.1513, allocations: 199.7 kB / 0.6312 GB, free: 14.98 MB / 458.8 MB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.001684/0.153, allocations: 1.076 MB / 0.6322 GB, free: 13.9 MB / 458.8 MB
Notification: Performance of preOpt findStateOrder (simulation): time 1.486e-05/0.153, allocations: 192 / 0.6322 GB, free: 13.9 MB / 458.8 MB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 0.0001171/0.1531, allocations: 27.94 kB / 0.6323 GB, free: 13.87 MB / 458.8 MB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.521e-05/0.1531, allocations: 23.92 kB / 0.6323 GB, free: 13.85 MB / 458.8 MB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001114/0.1542, allocations: 0.6687 MB / 0.6329 GB, free: 13.18 MB / 458.8 MB
Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.002943/0.1572, allocations: 1.666 MB / 0.6346 GB, free: 11.46 MB / 458.8 MB
Notification: Performance of preOpt comSubExp (simulation): time 0.05863/0.2158, allocations: 9.151 MB / 0.6435 GB, free: 2.293 MB / 458.8 MB
Notification: Performance of preOpt resolveLoops (simulation): time 0.001537/0.2174, allocations: 0.7736 MB / 0.6443 GB, free: 1.52 MB / 458.8 MB
Notification: Performance of preOpt evalFunc (simulation): time 0.0002191/0.2176, allocations: 17.31 kB / 0.6443 GB, free: 1.504 MB / 458.8 MB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 4.069e-05/0.2177, allocations: 47.81 kB / 0.6443 GB, free: 1.445 MB / 458.8 MB
Notification: Performance of pre-optimization done (n=160): time 3.196e-06/0.2177, allocations: 0 / 0.6443 GB, free: 1.445 MB / 458.8 MB
Notification: Performance of matching and sorting (n=160): time 0.00413/0.2219, allocations: 2.44 MB / 0.6467 GB, free: 15 MB / 474.8 MB
Notification: Performance of inlineWhenForInitialization (initialization): time 4.356e-05/0.2219, allocations: 76.7 kB / 0.6468 GB, free: 14.91 MB / 474.8 MB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.0001055/0.222, allocations: 153.8 kB / 0.6469 GB, free: 14.75 MB / 474.8 MB
Notification: Performance of collectPreVariables (initialization): time 0.0001338/0.2222, allocations: 77.7 kB / 0.647 GB, free: 14.67 MB / 474.8 MB
Notification: Performance of collectInitialEqns (initialization): time 6.429e-05/0.2222, allocations: 123.9 kB / 0.6471 GB, free: 14.55 MB / 474.8 MB
Notification: Performance of collectInitialBindings (initialization): time 0.0004871/0.2227, allocations: 0.7161 MB / 0.6478 GB, free: 13.82 MB / 474.8 MB
Notification: Performance of simplifyInitialFunctions (initialization): time 0.0006316/0.2234, allocations: 461.2 kB / 0.6482 GB, free: 13.36 MB / 474.8 MB
Notification: Performance of setup shared object (initialization): time 9.198e-05/0.2235, allocations: 310 kB / 0.6485 GB, free: 13.05 MB / 474.8 MB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.00154/0.225, allocations: 0.9924 MB / 0.6495 GB, free: 12.06 MB / 474.8 MB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.001589/0.2266, allocations: 1.025 MB / 0.6505 GB, free: 11.03 MB / 474.8 MB
Notification: Performance of analyzeInitialSystem (initialization): time 0.00309/0.2297, allocations: 2.139 MB / 0.6526 GB, free: 8.859 MB / 474.8 MB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 5.42e-06/0.2297, allocations: 0 / 0.6526 GB, free: 8.859 MB / 474.8 MB
Notification: Performance of matching and sorting (n=318) (initialization): time 0.003903/0.2336, allocations: 2.605 MB / 0.6551 GB, free: 6.215 MB / 474.8 MB
Notification: Performance of prepare postOptimizeDAE: time 2.216e-05/0.2337, allocations: 4 kB / 0.6552 GB, free: 6.211 MB / 474.8 MB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 9.788e-06/0.2337, allocations: 0 / 0.6552 GB, free: 6.211 MB / 474.8 MB
Notification: Performance of postOpt tearingSystem (initialization): time 2.824e-05/0.2337, allocations: 12 kB / 0.6552 GB, free: 6.199 MB / 474.8 MB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.003708/0.2374, allocations: 0.6631 MB / 0.6558 GB, free: 5.535 MB / 474.8 MB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 3.179e-05/0.2375, allocations: 12 kB / 0.6558 GB, free: 5.523 MB / 474.8 MB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002503/0.24, allocations: 349.9 kB / 0.6562 GB, free: 5.18 MB / 474.8 MB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0001634/0.2402, allocations: 68 kB / 0.6562 GB, free: 5.113 MB / 474.8 MB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 1
 * 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 (318):
 * Single equations (assignments): 318
 * 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 0.0003928/0.2406, allocations: 285.2 kB / 0.6565 GB, free: 4.824 MB / 474.8 MB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0001897/0.2408, allocations: 71.28 kB / 0.6566 GB, free: 4.754 MB / 474.8 MB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.0009272/0.2417, allocations: 278.1 kB / 0.6568 GB, free: 4.48 MB / 474.8 MB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.764e-05/0.2417, allocations: 20 kB / 0.6568 GB, free: 4.461 MB / 474.8 MB
Notification: Performance of postOpt constantLinearSystem (simulation): time 1.196e-05/0.2417, allocations: 0 / 0.6568 GB, free: 4.461 MB / 474.8 MB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 1.3e-05/0.2418, allocations: 7.969 kB / 0.6569 GB, free: 4.453 MB / 474.8 MB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.005721/0.2475, allocations: 3.181 MB / 0.66 GB, free: 1.203 MB / 474.8 MB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 7.674e-06/0.2475, allocations: 4 kB / 0.66 GB, free: 1.199 MB / 474.8 MB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.004151/0.2517, allocations: 491.7 kB / 0.6604 GB, free: 0.7188 MB / 474.8 MB
Notification: Performance of postOpt tearingSystem (simulation): time 1.202e-05/0.2517, allocations: 8 kB / 0.6604 GB, free: 0.7109 MB / 474.8 MB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0002299/0.2519, allocations: 103.9 kB / 0.6605 GB, free: 0.6094 MB / 474.8 MB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 8.827e-06/0.252, allocations: 4 kB / 0.6605 GB, free: 0.6055 MB / 474.8 MB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 1.653e-06/0.252, allocations: 7.938 kB / 0.6605 GB, free: 0.5977 MB / 474.8 MB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.03922/0.2912, allocations: 16.48 MB / 0.6766 GB, free: 15.94 MB / 0.4949 GB
Notification: Performance of postOpt removeConstants (simulation): time 8.88e-05/0.2913, allocations: 152.1 kB / 0.6768 GB, free: 15.77 MB / 0.4949 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0002332/0.2916, allocations: 83.92 kB / 0.6769 GB, free: 15.69 MB / 0.4949 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.002442/0.294, allocations: 223.7 kB / 0.6771 GB, free: 15.47 MB / 0.4949 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0003232/0.2943, allocations: 93.17 kB / 0.6772 GB, free: 15.38 MB / 0.4949 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001481/0.2945, allocations: 47.97 kB / 0.6772 GB, free: 15.33 MB / 0.4949 GB
Notification: Performance of sorting global known variables: time 4.852e-05/0.2946, allocations: 91.2 kB / 0.6773 GB, free: 15.24 MB / 0.4949 GB
Notification: Performance of sort global known variables: time 1.2e-07/0.2946, allocations: 0 / 0.6773 GB, free: 15.24 MB / 0.4949 GB
Notification: Performance of remove unused functions: time 0.001297/0.2959, allocations: 0.7852 MB / 0.6781 GB, free: 14.46 MB / 0.4949 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 3
 * Number of states: 158 (T[2],T[3],T[4],T[5],T[6],T[7],T[8],T[9],T[10],T[11],T[12],T[13],T[14],T[15],T[16],T[17],T[18],T[19],T[20],T[21],T[22],T[23],T[24],T[25],T[26],T[27],T[28],T[29],T[30],T[31],T[32],T[33],T[34],T[35],T[36],T[37],T[38],T[39],T[40],T[41],T[42],T[43],T[44],T[45],T[46],T[47],T[48],T[49],T[50],T[51],T[52],T[53],T[54],T[55],T[56],T[57],T[58],T[59],T[60],T[61],T[62],T[63],T[64],T[65],T[66],T[67],T[68],T[69],T[70],T[71],T[72],T[73],T[74],T[75],T[76],T[77],T[78],T[79],T[80],T[81],T[82],T[83],T[84],T[85],T[86],T[87],T[88],T[89],T[90],T[91],T[92],T[93],T[94],T[95],T[96],T[97],T[98],T[99],T[100],T[101],T[102],T[103],T[104],T[105],T[106],T[107],T[108],T[109],T[110],T[111],T[112],T[113],T[114],T[115],T[116],T[117],T[118],T[119],T[120],T[121],T[122],T[123],T[124],T[125],T[126],T[127],T[128],T[129],T[130],T[131],T[132],T[133],T[134],T[135],T[136],T[137],T[138],T[139],T[140],T[141],T[142],T[143],T[144],T[145],T[146],T[147],T[148],T[149],T[150],T[151],T[152],T[153],T[154],T[155],T[156],T[157],T[158],T[159])
 * 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 (160):
 * Single equations (assignments): 160
 * 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 0.0003142/0.2962, allocations: 230.9 kB / 0.6783 GB, free: 14.22 MB / 0.4949 GB
Notification: Performance of simCode: created initialization part: time 0.003186/0.2994, allocations: 2.161 MB / 0.6804 GB, free: 12.06 MB / 0.4949 GB
Notification: Performance of simCode: created event and clocks part: time 2.575e-06/0.2994, allocations: 0 / 0.6804 GB, free: 12.06 MB / 0.4949 GB
Notification: Performance of simCode: created simulation system equations: time 0.001364/0.3008, allocations: 0.9247 MB / 0.6813 GB, free: 11.13 MB / 0.4949 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001147/0.3019, allocations: 319.6 kB / 0.6816 GB, free: 10.82 MB / 0.4949 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.4084/0.7103, allocations: 11.4 MB / 0.6927 GB, free: 73.33 MB / 0.495 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0006694/0.711, allocations: 1.108 MB / 0.6938 GB, free: 72.62 MB / 0.495 GB
Notification: Performance of simCode: alias equations: time 0.003348/0.7144, allocations: 0.8871 MB / 0.6947 GB, free: 72.6 MB / 0.495 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.001058/0.7155, allocations: 107.2 kB / 0.6948 GB, free: 72.59 MB / 0.495 GB
Notification: Performance of SimCode: time 7.92e-07/0.7155, allocations: 0 / 0.6948 GB, free: 72.59 MB / 0.495 GB
Notification: Performance of Templates: time 0.04329/0.7588, allocations: 35.47 MB / 0.7294 GB, free: 54.84 MB / 0.495 GB
make -j1 -f ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.makefile
(rm -f ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.pipe ; mkfifo ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.pipe ; head -c 1048576 < ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.pipe >> ../files/ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.sim & ./ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160  -abortSlowSimulation -alarm=300  -emit_protected -lv LOG_STATS > ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.pipe 2>&1)
diffSimulationResults("ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160_res.mat","/var/lib/jenkins/ws/OpenModelicaLibraryTestingWork@2/OpenModelicaLibraryTesting/ReferenceFiles/ScalableTestSuite/ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160_res.mat","../files/ScalableTestSuite_ScalableTestSuite.Thermal.HeatConduction.ScaledExperiments.OneDHeatTransferTT_FD_N_160.diff",relTol=0.003,relTolDiffMinMax=0.003,rangeDelta=0.001)
Reference file matches