[SDK] Added reserve for spans array in BatchSpanProcessor.

[msiddhu]

Changes

Added .reserve for spans_arr in BatchSpanProcessor (Small Optimization)

Helps to allocate the amount of memory needed for number of records so that dynamic memory allocation doesn't happen in the consume method.

.push_back() reallocates memory each time the method is called.

Using .reserve() would avoid memory reallocation as already the memory is allocated.

References: C++ Vector push_back C++ Vector reserve

• [ ] CHANGELOG.md updated for non-trivial changes
• [ ] Unit tests have been added
• [ ] Changes in public API reviewed

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: msiddhu / name: Siddhartha Malladi (2d120ccb4f79bc22b3575d47db5931348726bf43, f91df5282968f0720c28f583885bd9406762b710, dbcc4a7f106ecc3cbf6eaf0eda4c9f9e14f13aca, b6ec481233c86a03a34555bcce1010a63d6d00de, 9f36f8a253a2b402143227f387740bba38d7dfd1)
• :white_check_mark: login: marcalff / name: Marc Alff (17aeaba93ad6c073fb122eaf66b049d057200845)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.67%. Comparing base (497eaf4) to head (17aeaba). Report is 91 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/2724?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ```diff @@ Coverage Diff @@ ## main #2724 +/- ## ========================================== + Coverage 87.12% 87.67% +0.56% ========================================== Files 200 190 -10 Lines 6109 5855 -254 ========================================== - Hits 5322 5133 -189 + Misses 787 722 -65 ``` | [Files](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/2724?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | Coverage Δ | | |---|---|---| | [sdk/src/logs/batch\_log\_record\_processor.cc](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/2724?src=pr&el=tree&filepath=sdk%2Fsrc%2Flogs%2Fbatch_log_record_processor.cc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry#diff-c2RrL3NyYy9sb2dzL2JhdGNoX2xvZ19yZWNvcmRfcHJvY2Vzc29yLmNj) | `89.29% <100.00%> (+1.79%)` | :arrow_up: | | [sdk/src/trace/batch\_span\_processor.cc](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/2724?src=pr&el=tree&filepath=sdk%2Fsrc%2Ftrace%2Fbatch_span_processor.cc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry#diff-c2RrL3NyYy90cmFjZS9iYXRjaF9zcGFuX3Byb2Nlc3Nvci5jYw==) | `94.12% <100.00%> (+1.70%)` | :arrow_up: | ... and [105 files with indirect coverage changes](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/2724/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry)

[msiddhu]

Thanks for suggesting. I think CI Checks should starting running now.

[lalitb]

Similar change can be done for BatchLogProcessor. @msiddhu just in case you can handle as separate as same PR :)

[msiddhu]

Thanks for pointing out. Made the suggested changes. Please review.