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LUMIERA.clone/doc/devel/dump/2024-04-08.Scheduler-LoadTest/Topo-20.dot
Ichthyostega c934e7f079 Scheduler-test: reduce impact of scale adjustments on breakpoint-search 
the `BreakingPoint` tool conducts a binary search to find the ''stress factor''
where a given schedule breaks. There are some known deviations related to the
measurement setup, which unfortunately impact the interpretation of the
''stress factor'' scale. Earlier, an attempt was made, to watch those factors
empirically and work a ''form factor'' into the ''effective stress factor''
used to guide this measurement method.

Closer investigation with extended and elastic load patters now revealed
a strong tendency of the Scheduler to scale down the work resources when not
fully loaded. This may be mistaken by the above mentioned adjustments as a sign
of a structural limiation of the possible concurrency.

Thus, as a mitigation, those adjustments are now only performed at the
beginning of the measurement series, and also only when the stress factor
is high (implying that the scheduler is actually overloaded and thus has
no incentive for scaling down).

These observations indicate that the »Breaking Point« search must be taken
with a grain of salt: Especially when the test load does ''not'' contain
a high degree of inter dependencies, it will be ''stretched elastically''
rather than outright broken. And under such circumstances, this measurement
actually gauges the Scheduler's ability to comply to an established
load and computation goal.
2024-04-18 01:39:27 +02:00

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digraph {
// Nodes
N0[label="0: 37", shape=doublecircle ]
N1[label="1: 37", shape=circle ]
N2[label="2: 37", shape=circle ]
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N16[label="16: 37", shape=circle ]
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N18[label="18: 37", shape=circle ]
N19[label="19: 37", shape=circle ]
N20[label="20: 4F", shape=box, style=rounded ]
N21[label="21: 37", shape=circle ]
N22[label="22: 37", shape=circle ]
N23[label="23: 4F", shape=box, style=rounded ]
N24[label="24: 37", shape=circle ]
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N26[label="26: 37", shape=circle ]
N27[label="27: 37", shape=circle ]
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N29[label="29: 37", shape=circle ]
N30[label="30: 37", shape=circle ]
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N32[label="32: 37", shape=circle ]
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N34[label="34: 37", shape=circle ]
N35[label="35: 37", shape=circle ]
N36[label="36: 4F", shape=box, style=rounded ]
N37[label="37: 37", shape=circle ]
N38[label="38: 37", shape=circle ]
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N40[label="40: 37", shape=circle ]
N41[label="41: 3A" ]
N42[label="42: 37", shape=circle ]
N43[label="43: 37", shape=circle ]
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N45[label="45: 37", shape=circle ]
N46[label="46: 37", shape=circle ]
N47[label="47: 4F", shape=box, style=rounded ]
N48[label="48: 37", shape=circle ]
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N50[label="50: 37", shape=circle ]
N51[label="51: 37", shape=circle ]
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N53[label="53: 37", shape=circle ]
N54[label="54: 37", shape=circle ]
N55[label="55: 4F", shape=box, style=rounded ]
N56[label="56: 37", shape=circle ]
N57[label="57: 40" ]
N58[label="58: 37", shape=circle ]
N59[label="59: 37", shape=circle ]
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N62[label="62: 37", shape=circle ]
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N77[label="77: 37", shape=circle ]
N78[label="78: 37", shape=circle ]
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N82[label="82: 37", shape=circle ]
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N86[label="86: 37", shape=circle ]
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N88[label="88: 37", shape=circle ]
N89[label="89: 3A" ]
N90[label="90: 37", shape=circle ]
N91[label="91: 37", shape=circle ]
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N93[label="93: 37", shape=circle ]
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N112[label="112: 37", shape=circle ]
N113[label="113: 3A" ]
N114[label="114: 37", shape=circle ]
N115[label="115: 37", shape=circle ]
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N117[label="117: 37", shape=circle ]
N118[label="118: 37", shape=circle ]
N119[label="119: 4F", shape=box, style=rounded ]
N120[label="120: 37", shape=circle ]
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N122[label="122: 37", shape=circle ]
N123[label="123: 37", shape=circle ]
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N125[label="125: 37", shape=circle ]
N126[label="126: 37", shape=circle ]
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N130[label="130: 37", shape=circle ]
N131[label="131: 37", shape=circle ]
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N136[label="136: 37", shape=circle ]
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N138[label="138: 37", shape=circle ]
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N142[label="142: 37", shape=circle ]
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N144[label="144: 37", shape=circle ]
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N146[label="146: 37", shape=circle ]
N147[label="147: 37", shape=circle ]
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N150[label="150: 37", shape=circle ]
N151[label="151: 4F", shape=box, style=rounded ]
N152[label="152: 37", shape=circle ]
N153[label="153: 40" ]
N154[label="154: 37", shape=circle ]
N155[label="155: 37", shape=circle ]
N156[label="156: 4F", shape=box, style=rounded ]
N157[label="157: 37", shape=circle ]
N158[label="158: 37", shape=circle ]
N159[label="159: 4F", shape=box, style=rounded ]
N160[label="160: 37", shape=circle ]
N161[label="161: 3A" ]
N162[label="162: 37", shape=circle ]
N163[label="163: 37", shape=circle ]
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N166[label="166: 37", shape=circle ]
N167[label="167: 4F", shape=box, style=rounded ]
N168[label="168: 37", shape=circle ]
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N170[label="170: 37", shape=circle ]
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N173[label="173: 37", shape=circle ]
N174[label="174: 37", shape=circle ]
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N176[label="176: 37", shape=circle ]
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N178[label="178: 37", shape=circle ]
N179[label="179: 37", shape=circle ]
N180[label="180: 4F", shape=box, style=rounded ]
N181[label="181: 37", shape=circle ]
N182[label="182: 37", shape=circle ]
N183[label="183: 4F", shape=box, style=rounded ]
N184[label="184: 37", shape=circle ]
N185[label="185: 3A" ]
N186[label="186: 37", shape=circle ]
N187[label="187: 37", shape=circle ]
N188[label="188: 4F", shape=box, style=rounded ]
N189[label="189: 37", shape=circle ]
N190[label="190: 37", shape=circle ]
N191[label="191: 4F", shape=box, style=rounded ]
N192[label="192: 37", shape=circle ]
N193[label="193: F9", shape=box, style=rounded ]
N194[label="194: 37", shape=circle ]
N195[label="195: 37", shape=circle ]
N196[label="196: 4F", shape=box, style=rounded ]
N197[label="197: 37", shape=circle ]
N198[label="198: 37", shape=circle ]
N199[label="199: 4F", shape=box, style=rounded ]
N200[label="200: 37", shape=circle ]
N201[label="201: 40" ]
N202[label="202: 37", shape=circle ]
N203[label="203: 37", shape=circle ]
N204[label="204: 4F", shape=box, style=rounded ]
N205[label="205: 37", shape=circle ]
N206[label="206: 37", shape=circle ]
N207[label="207: 4F", shape=box, style=rounded ]
N208[label="208: 37", shape=circle ]
N209[label="209: 3A" ]
N210[label="210: 37", shape=circle ]
N211[label="211: 37", shape=circle ]
N212[label="212: 4F", shape=box, style=rounded ]
N213[label="213: 37", shape=circle ]
N214[label="214: 37", shape=circle ]
N215[label="215: 4F", shape=box, style=rounded ]
N216[label="216: 37", shape=circle ]
N217[label="217: F9", shape=box, style=rounded ]
N218[label="218: 37", shape=circle ]
N219[label="219: 37", shape=circle ]
N220[label="220: 4F", shape=box, style=rounded ]
N221[label="221: 37", shape=circle ]
N222[label="222: 37", shape=circle ]
N223[label="223: 4F", shape=box, style=rounded ]
N224[label="224: 37", shape=circle ]
N225[label="225: 40" ]
N226[label="226: 37", shape=circle ]
N227[label="227: 37", shape=circle ]
N228[label="228: 4F", shape=box, style=rounded ]
N229[label="229: 37", shape=circle ]
N230[label="230: 37", shape=circle ]
N231[label="231: 4F", shape=box, style=rounded ]
N232[label="232: 37", shape=circle ]
N233[label="233: 3A" ]
N234[label="234: 37", shape=circle ]
N235[label="235: 37", shape=circle ]
N236[label="236: 4F", shape=box, style=rounded ]
N237[label="237: 37", shape=circle ]
N238[label="238: 37", shape=circle ]
N239[label="239: 4F", shape=box, style=rounded ]
N240[label="240: 37", shape=circle ]
N241[label="241: F9", shape=box, style=rounded ]
N242[label="242: 37", shape=circle ]
N243[label="243: 37", shape=circle ]
N244[label="244: 4F", shape=box, style=rounded ]
N245[label="245: 37", shape=circle ]
N246[label="246: 37", shape=circle ]
N247[label="247: 4F", shape=box, style=rounded ]
N248[label="248: 37", shape=circle ]
N249[label="249: 40" ]
N250[label="250: 37", shape=circle ]
N251[label="251: 37", shape=circle ]
N252[label="252: 4F", shape=box, style=rounded ]
N253[label="253: 37", shape=circle ]
N254[label="254: 37", shape=circle ]
N255[label="255: 52", shape=box, style=rounded ]
// Layers
{ /*0*/ rank=min N0 }
{ /*1*/ rank=same N1 N2 N3 }
{ /*2*/ rank=same N4 N5 N6 N7 N8 N9 }
{ /*3*/ rank=same N10 N11 N12 N13 N14 N15 N16 N17 }
{ /*4*/ rank=same N18 N19 N20 N21 N22 N23 N24 N25 }
{ /*5*/ rank=same N26 N27 N28 N29 N30 N31 N32 N33 }
{ /*6*/ rank=same N34 N35 N36 N37 N38 N39 N40 N41 }
{ /*7*/ rank=same N42 N43 N44 N45 N46 N47 N48 N49 }
{ /*8*/ rank=same N50 N51 N52 N53 N54 N55 N56 N57 }
{ /*9*/ rank=same N58 N59 N60 N61 N62 N63 N64 N65 }
{ /*10*/ rank=same N66 N67 N68 N69 N70 N71 N72 N73 }
{ /*11*/ rank=same N74 N75 N76 N77 N78 N79 N80 N81 }
{ /*12*/ rank=same N82 N83 N84 N85 N86 N87 N88 N89 }
{ /*13*/ rank=same N90 N91 N92 N93 N94 N95 N96 N97 }
{ /*14*/ rank=same N98 N99 N100 N101 N102 N103 N104 N105 }
{ /*15*/ rank=same N106 N107 N108 N109 N110 N111 N112 N113 }
{ /*16*/ rank=same N114 N115 N116 N117 N118 N119 N120 N121 }
{ /*17*/ rank=same N122 N123 N124 N125 N126 N127 N128 N129 }
{ /*18*/ rank=same N130 N131 N132 N133 N134 N135 N136 N137 }
{ /*19*/ rank=same N138 N139 N140 N141 N142 N143 N144 N145 }
{ /*20*/ rank=same N146 N147 N148 N149 N150 N151 N152 N153 }
{ /*21*/ rank=same N154 N155 N156 N157 N158 N159 N160 N161 }
{ /*22*/ rank=same N162 N163 N164 N165 N166 N167 N168 N169 }
{ /*23*/ rank=same N170 N171 N172 N173 N174 N175 N176 N177 }
{ /*24*/ rank=same N178 N179 N180 N181 N182 N183 N184 N185 }
{ /*25*/ rank=same N186 N187 N188 N189 N190 N191 N192 N193 }
{ /*26*/ rank=same N194 N195 N196 N197 N198 N199 N200 N201 }
{ /*27*/ rank=same N202 N203 N204 N205 N206 N207 N208 N209 }
{ /*28*/ rank=same N210 N211 N212 N213 N214 N215 N216 N217 }
{ /*29*/ rank=same N218 N219 N220 N221 N222 N223 N224 N225 }
{ /*30*/ rank=same N226 N227 N228 N229 N230 N231 N232 N233 }
{ /*31*/ rank=same N234 N235 N236 N237 N238 N239 N240 N241 }
{ /*32*/ rank=same N242 N243 N244 N245 N246 N247 N248 N249 }
{ /*33*/ rank=same N250 N251 N252 N253 N254 N255 }
// Topology
N0 -> N3
N1 -> N6
N2 -> N9
N4 -> N12
N5 -> N15
N7 -> N17
N8 -> N17
N10 -> N20
N11 -> N23
N13 -> N25
N14 -> N25
N16 -> N25
N17 -> N25
N18 -> N28
N19 -> N31
N21 -> N33
N22 -> N33
N24 -> N33
N26 -> N36
N27 -> N39
N29 -> N41
N30 -> N41
N32 -> N41
N33 -> N41
N34 -> N44
N35 -> N47
N37 -> N49
N38 -> N49
N40 -> N49
N41 -> N49
N42 -> N52
N43 -> N55
N45 -> N57
N46 -> N57
N48 -> N57
N50 -> N60
N51 -> N63
N53 -> N65
N54 -> N65
N56 -> N65
N57 -> N65
N58 -> N68
N59 -> N71
N61 -> N73
N62 -> N73
N64 -> N73
N65 -> N73
N66 -> N76
N67 -> N79
N69 -> N81
N70 -> N81
N72 -> N81
N74 -> N84
N75 -> N87
N77 -> N89
N78 -> N89
N80 -> N89
N81 -> N89
N82 -> N92
N83 -> N95
N85 -> N97
N86 -> N97
N88 -> N97
N89 -> N97
N90 -> N100
N91 -> N103
N93 -> N105
N94 -> N105
N96 -> N105
N98 -> N108
N99 -> N111
N101 -> N113
N102 -> N113
N104 -> N113
N105 -> N113
N106 -> N116
N107 -> N119
N109 -> N121
N110 -> N121
N112 -> N121
N113 -> N121
N114 -> N124
N115 -> N127
N117 -> N129
N118 -> N129
N120 -> N129
N122 -> N132
N123 -> N135
N125 -> N137
N126 -> N137
N128 -> N137
N129 -> N137
N130 -> N140
N131 -> N143
N133 -> N145
N134 -> N145
N136 -> N145
N137 -> N145
N138 -> N148
N139 -> N151
N141 -> N153
N142 -> N153
N144 -> N153
N146 -> N156
N147 -> N159
N149 -> N161
N150 -> N161
N152 -> N161
N153 -> N161
N154 -> N164
N155 -> N167
N157 -> N169
N158 -> N169
N160 -> N169
N161 -> N169
N162 -> N172
N163 -> N175
N165 -> N177
N166 -> N177
N168 -> N177
N170 -> N180
N171 -> N183
N173 -> N185
N174 -> N185
N176 -> N185
N177 -> N185
N178 -> N188
N179 -> N191
N181 -> N193
N182 -> N193
N184 -> N193
N185 -> N193
N186 -> N196
N187 -> N199
N189 -> N201
N190 -> N201
N192 -> N201
N194 -> N204
N195 -> N207
N197 -> N209
N198 -> N209
N200 -> N209
N201 -> N209
N202 -> N212
N203 -> N215
N205 -> N217
N206 -> N217
N208 -> N217
N209 -> N217
N210 -> N220
N211 -> N223
N213 -> N225
N214 -> N225
N216 -> N225
N218 -> N228
N219 -> N231
N221 -> N233
N222 -> N233
N224 -> N233
N225 -> N233
N226 -> N236
N227 -> N239
N229 -> N241
N230 -> N241
N232 -> N241
N233 -> N241
N234 -> N244
N235 -> N247
N237 -> N249
N238 -> N249
N240 -> N249
N242 -> N252
N243 -> N255
N245 -> N255
N246 -> N255
N248 -> N255
N249 -> N255
}
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