[
https://issues.apache.org/jira/browse/GEODE-8213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17142734#comment-17142734
]
ASF GitHub Bot commented on GEODE-8213:
---------------------------------------
albertogpz commented on a change in pull request #611:
URL: https://github.com/apache/geode-native/pull/611#discussion_r437398002
##########
File path: cppcache/src/SerializationRegistry.cpp
##########
@@ -409,44 +411,56 @@ void TheTypeMap::bindDataSerializable(TypeFactoryMethod
func, int32_t id) {
"TheTypeMap::bind: Serialization type not implemented.");
}
- std::lock_guard<util::concurrent::spinlock_mutex> guard(
- m_dataSerializableMapLock);
- const auto& result = m_dataSerializableMap.emplace(id, func);
+ auto tempDataSerializableMap =
+ std::make_shared<std::unordered_map<int32_t, TypeFactoryMethod>>(
+ *m_dataSerializableMap);
+ const auto& result = tempDataSerializableMap->emplace(id, func);
if (!result.second) {
LOGERROR("A class with ID %d is already registered.", id);
throw IllegalStateException("A class with given ID is already
registered.");
}
+ std::atomic_store(&m_dataSerializableMap, tempDataSerializableMap);
Review comment:
I changed the implementation to boost::shared_mutex and the performance
measured by the benchmark introduced was way worse than with the spinlock. I
had read that the implementation of the boost::shared_lock was suboptimal on
Linux.
These are the figures:
```
Benchmark
Time CPU Time Old Time New CPU Old
CPU New
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:1
+1.0440 +1.0438 213 435 213
434
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:2
+0.9090 +0.9091 156 297 312
595
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:4
+1.0325 +1.0136 65 132 254
512
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:8
+0.7878 +0.7826 43 78 348
620
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:16
+0.9026 +1.0066 31 59 357
717
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:32
+0.9935 +0.9967 28 57 365
729
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:64
+1.0535 +1.0519 26 54 358
735
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:96
+1.1182 +1.0243 25 52 360
729
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:1
+0.7410 +0.7410 231 403 231
403
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:2
+1.4190 +1.3271 114 276 228
531
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:4
+0.9838 +0.9709 59 116 234
462
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:8
+0.9452 +0.9369 42 82 335
649
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:16
+1.0843 +0.9737 30 62 368
725
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:32
+1.0204 +1.0018 28 57 367
735
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:64
+0.9670 +0.9939 28 55 368
734
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:96
+0.8644 +1.0207 29 54 362
732
SerializationRegistryBM_findDataSerializable/real_time/threads:1
+0.9817 +0.9817 211 418 211
418
SerializationRegistryBM_findDataSerializable/real_time/threads:2
+0.3399 +0.3401 157 211 314
421
SerializationRegistryBM_findDataSerializable/real_time/threads:4
+1.2335 +1.2339 59 133 237
530
SerializationRegistryBM_findDataSerializable/real_time/threads:8
+0.9273 +0.9344 42 81 335
648
SerializationRegistryBM_findDataSerializable/real_time/threads:16
+1.1570 +1.0856 29 63 360
750
SerializationRegistryBM_findDataSerializable/real_time/threads:32
+1.2448 +1.0935 28 62 364
762
SerializationRegistryBM_findDataSerializable/real_time/threads:64
+1.0317 +1.0715 27 56 363
752
SerializationRegistryBM_findDataSerializable/real_time/threads:96
+1.0391 +1.0796 26 54 361
751
SerializationRegistryBM_findPdxSerializable/real_time/threads:1
+0.8144 +0.8144 234 425 234
425
SerializationRegistryBM_findPdxSerializable/real_time/threads:2
+0.4180 +0.4181 154 218 308
436
SerializationRegistryBM_findPdxSerializable/real_time/threads:4
+0.6402 +0.6284 73 120 293
476
SerializationRegistryBM_findPdxSerializable/real_time/threads:8
+1.3334 +1.3390 39 90 307
717
SerializationRegistryBM_findPdxSerializable/real_time/threads:16
+0.9053 +0.9381 34 65 407
789
SerializationRegistryBM_findPdxSerializable/real_time/threads:32
+1.0597 +0.9980 31 64 414
828
SerializationRegistryBM_findPdxSerializable/real_time/threads:64
+0.9588 +0.9441 32 63 413
803
SerializationRegistryBM_findPdxSerializable/real_time/threads:96
+0.7951 +0.9451 32 57 411
800
```
I tried with C++14 std::shared_timed_mutex and the performance was better in
most cases although the improvement was not spectacular:
```
Benchmark
Time CPU Time Old Time New CPU Old
CPU New
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:1
-0.0320 -0.0320 213 206 213
206
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:2
-0.2957 -0.2957 156 110 312
219
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:4
-0.1130 -0.0923 65 58 254
231
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:8
-0.0796 -0.0811 43 40 348
319
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:16
-0.0082 +0.0533 31 31 357
376
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:32
+0.0372 +0.0424 28 30 365
381
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:64
+0.0669 +0.0692 26 28 358
383
SerializationRegistryBM_findDataSerializablePrimitive/real_time/threads:96
+0.1285 +0.0457 25 28 360
377
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:1
-0.0929 -0.0929 231 210 231
210
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:2
-0.0190 -0.0191 114 112 228
224
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:4
-0.0091 -0.0092 59 58 234
232
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:8
-0.1483 -0.1501 42 36 335
285
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:16
+0.0480 +0.0159 30 31 368
373
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:32
+0.0776 +0.0321 28 30 367
379
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:64
+0.0035 +0.0254 28 28 368
378
SerializationRegistryBM_findDataSerializableFixedId/real_time/threads:96
+0.0029 +0.0447 29 29 362
378
SerializationRegistryBM_findDataSerializable/real_time/threads:1
+0.0412 +0.0412 211 219 211
219
SerializationRegistryBM_findDataSerializable/real_time/threads:2
-0.3122 -0.3121 157 108 314
216
SerializationRegistryBM_findDataSerializable/real_time/threads:4
-0.0301 -0.0299 59 58 237
230
SerializationRegistryBM_findDataSerializable/real_time/threads:8
-0.0128 -0.0112 42 42 335
331
SerializationRegistryBM_findDataSerializable/real_time/threads:16
+0.0404 +0.0318 29 30 360
371
SerializationRegistryBM_findDataSerializable/real_time/threads:32
-0.0093 +0.0292 28 27 364
374
SerializationRegistryBM_findDataSerializable/real_time/threads:64
-0.0119 +0.0465 27 27 363
380
SerializationRegistryBM_findDataSerializable/real_time/threads:96
-0.0511 +0.0467 26 25 361
378
SerializationRegistryBM_findPdxSerializable/real_time/threads:1
-0.0410 -0.0410 234 225 234
225
SerializationRegistryBM_findPdxSerializable/real_time/threads:2
-0.2185 -0.2185 154 120 308
240
SerializationRegistryBM_findPdxSerializable/real_time/threads:4
-0.1662 -0.1662 73 61 293
244
SerializationRegistryBM_findPdxSerializable/real_time/threads:8
+0.0004 -0.0001 39 39 307
306
SerializationRegistryBM_findPdxSerializable/real_time/threads:16
-0.0075 +0.0106 34 34 407
412
SerializationRegistryBM_findPdxSerializable/real_time/threads:32
+0.0701 +0.0034 31 33 414
416
SerializationRegistryBM_findPdxSerializable/real_time/threads:64
-0.0072 +0.0068 32 32 413
416
SerializationRegistryBM_findPdxSerializable/real_time/threads:96
-0.0614 +0.0182 32 30 411
419
```
As a result, I do not see the point in changing the implementation until
Geode is upgraded to a later C++ version. Do you know if there are plans for it?
I think at least we should leave the benchmark tests for future improvements.
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> C++ native client performance bottleneck in access to serialization registry
> ----------------------------------------------------------------------------
>
> Key: GEODE-8213
> URL: https://issues.apache.org/jira/browse/GEODE-8213
> Project: Geode
> Issue Type: Improvement
> Components: native client
> Reporter: Alberto Gomez
> Assignee: Alberto Gomez
> Priority: Major
> Fix For: 1.14.0
>
>
> It's been observed that when the number of threads used in a Geode client
> using PdxSerialization is greater than 8, there is an important drop in
> performance.
> Analysing the client process behavior with perf, it has been observed a very
> high CPU consumption by a spinlock
> (apache::geode::util::concurrent::spinlock_mutex::lock) used when accessing
> the serialization registry .
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