albertogpz commented on pull request #621:
URL: https://github.com/apache/geode-native/pull/621#issuecomment-647987941
The shared_lock provided by boost offered a much worse performance than the
spinlock or the mutex.
There is a tiny gain according to the benchmark performance test in most
cases using a mutex:
```
Benchmark
Time CPU Time Old Time New CPU Old
CPU New
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:1
-0.0997 -0.0998 193 174 193
174
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:2
-0.1107 -0.1107 100 89 199
177
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:4
-0.0666 -0.0667 51 48 206
192
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:8
-0.0151 -0.0160 32 32 259
255
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:16
+0.0258 +0.0430 24 25 300
313
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:32
+0.0843 +0.0349 22 24 309
320
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:64
+0.0283 +0.0359 22 23 312
323
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:96
-0.1669 +0.0336 25 21 315
326
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:1
-0.0925 -0.0925 190 173 190
173
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:2
-0.0528 -0.0529 98 93 197
186
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:4
-0.0803 -0.0803 53 49 213
195
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:8
-0.0801 -0.0802 35 32 279
256
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:16
-0.0189 -0.0052 26 25 318
316
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:32
-0.0000 +0.0145 25 25 325
330
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:64
-0.0363 +0.0179 24 24 327
332
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:96
-0.0465 +0.0151 24 23 328
333
SerializationRegistryBM_findDataSerializable/real_time/threads:1
-0.0557 -0.0557 193 183 193
183
SerializationRegistryBM_findDataSerializable/real_time/threads:2
-0.0190 -0.0190 98 97 197
193
SerializationRegistryBM_findDataSerializable/real_time/threads:4
-0.0716 -0.0722 56 52 222
206
SerializationRegistryBM_findDataSerializable/real_time/threads:8
-0.1733 -0.1726 37 30 295
244
SerializationRegistryBM_findDataSerializable/real_time/threads:16
-0.0343 -0.0065 26 25 322
319
SerializationRegistryBM_findDataSerializable/real_time/threads:32
+0.0158 +0.0069 25 25 327
329
SerializationRegistryBM_findDataSerializable/real_time/threads:64
-0.0160 +0.0143 25 25 326
331
SerializationRegistryBM_findDataSerializable/real_time/threads:96
+0.1475 +0.0089 22 25 329
332
SerializationRegistryBM_findPdxSerializable/real_time/threads:1
-0.0616 -0.0616 198 186 198
186
SerializationRegistryBM_findPdxSerializable/real_time/threads:2
-0.0794 -0.0795 101 93 202
186
SerializationRegistryBM_findPdxSerializable/real_time/threads:4
-0.0946 -0.0964 57 52 228
206
SerializationRegistryBM_findPdxSerializable/real_time/threads:8
-0.0001 -0.0016 38 38 303
302
SerializationRegistryBM_findPdxSerializable/real_time/threads:16
-0.0356 -0.0215 30 29 375
367
SerializationRegistryBM_findPdxSerializable/real_time/threads:32
-0.0635 -0.0182 29 27 383
376
SerializationRegistryBM_findPdxSerializable/real_time/threads:64
+0.0668 -0.0076 27 28 384
381
SerializationRegistryBM_findPdxSerializable/real_time/threads:96
+0.0098 -0.0051 28 28 386
384
```
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