[GitHub] [pulsar] Demogorgon314 commented on pull request #13246: [C++] Support arm64 optimized CRC32c hardware-instructions

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Demogorgon314 commented on pull request #13246:
URL: https://github.com/apache/pulsar/pull/13246#issuecomment-991868100


   Here is a simple benchmark about arm64 instructions optimized and software 
implementation, the performance is improved by **6** times.
   ```cpp
   TEST(ClientTest, testSwHwArmChecksumBench) {
       std::string data = "This is a simple benchmark for CRC32C hardware and 
software implementation.";
       int times = 100000;
       clock_t startTime,endTime;
       uint32_t hwArmChecksum;
       startTime = clock();
       for(int i = 0; i < times; i++) {
           hwArmChecksum = crc32cHwArm(0, (char *)data.c_str(), data.length());
       }
       endTime = clock();
       LOG_INFO("Crc32cHwArm run time is: " << endTime - startTime << " ms");
       uint32_t swChecksum;
       startTime = clock();
       for(int i = 0; i < times; i++) {
           swChecksum = crc32cSw(0, (char *)data.c_str(), data.length());
       }
       endTime = clock();
       LOG_INFO("Crc32cSw run time is: " << endTime - startTime << " ms");
   }
   ```
   ```text
   2021-12-12 17:58:36.299 INFO  [0x10594c580] ClientTest:104 | Crc32cHwArm run 
time is: 563 ms
   2021-12-12 17:58:36.303 INFO  [0x10594c580] ClientTest:111 | Crc32cSw run 
time is: 3840 ms
   ```


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