[Metrics SDK] Use nostd::function_ref in AttributesHashMap #3393
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Additional details and impacted files@@ Coverage Diff @@
## main #3393 +/- ##
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+ Coverage 89.96% 89.98% +0.02%
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Files 211 211
Lines 6812 6812
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+ Hits 6128 6129 +1
+ Misses 684 683 -1
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| Aggregation *GetOrSetDefault( | ||
| const opentelemetry::common::KeyValueIterable &attributes, | ||
| const AttributesProcessor *attributes_processor, | ||
| nostd::function_ref<std::unique_ptr<Aggregation>()> aggregation_callback) |
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Is it necessary to use nostd::function_ref instead of std::function?
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I've got a benchmark at https://github.com/grpc/grpc/blob/507a5de9483c9b8675e626977a51d9286f4104f0/test/cpp/microbenchmarks/bm_stats_plugin.cc#L81. After this change, it goes down from 200+ns to ~20ns.
Looking at the implementation, we don't need to make a copy of the passed in callable, so it seems desirable to do this.
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I compared the BM_AttributseHashMap benchmark result for this PR vs the PR from the last commit on main,
there does seem to be reduction in the realtime and cpu time:
Current HEAD (merged PR#3383):
"benchmarks": [
{
"name": "BM_AttributseHashMap",
"family_index": 0,
"per_family_instance_index": 0,
"run_name": "BM_AttributseHashMap",
"run_type": "iteration",
"repetitions": 1,
"repetition_index": 0,
"threads": 1,
"iterations": 7,
"real_time": 3.8004398345947266e+07,
"cpu_time": 2.0847316142857142e+07,
"time_unit": "ns"
}
]This PR's CI:
"benchmarks": [
{
"name": "BM_AttributseHashMap",
"family_index": 0,
"per_family_instance_index": 0,
"run_name": "BM_AttributseHashMap",
"run_type": "iteration",
"repetitions": 1,
"repetition_index": 0,
"threads": 1,
"iterations": 8,
"real_time": 2.9205620288848877e+07,
"cpu_time": 2.0728138000000000e+07,
"time_unit": "ns"
}
]Additionally, I think we are using the function_ref to immediately call and compute the result here, which makes me think it might be ok to add this change.
Note: Result located in sdk/test/metrics/attributes_hashmap_benchmark_result.json
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[Metrics SDK] Use nostd::function_ref in AttributesHashMap (open-telemetry#3393)
Changes
Use nostd::function_ref in AttributesHashMap for
aggregation_callback.A benchmark at https://github.com/grpc/grpc/blob/507a5de9483c9b8675e626977a51d9286f4104f0/test/cpp/microbenchmarks/bm_stats_plugin.cc#L81. shows time go down from 200+ns to ~20ns.
Additionally, with the benchmarks run by @psx95 on BM_AttributseHashMap -
Current HEAD (merged PR#3383):
This PR's CI:
Looking at the implementation, we don't need to make a copy of the passed in callable, so it seems desirable to do this.
For significant contributions please make sure you have completed the following items:
CHANGELOG.mdupdated for non-trivial changes