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  1. MariaDB Server
  2. MDEV-16859

MyRocks: support CRC32 instructions

Details

    Description

      MyRocks is compiled without CRC32 command support. This negatively affects performance.

      It is compiled without CRC32 on all packages (including Windows, .deb packages, etc...)

      One can check this by starting the plugin and looking into $datadir/#rocksdb/LOG. It will have something like:

      Fast CRC32 supported: Not supported on x86

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          Bug - A problem which impairs or prevents the functions of the product. MDEV-16860 MyRocks: support CRC32 instructions on Winx64

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17280 support fast CRC for MyRocks

          • Major - Major loss of function.
          • Closed

          Activity

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            psergei Sergei Petrunia added a comment -

            Another thing that file has is:

            #ifdef HAVE_SSE42
            		 
            #include <nmmintrin.h>
            		 
            #include <wmmintrin.h>
            		 
            #endif

            These files are not present on a default Linux install, so at least for .deb packaging we will need to figure out which package has them, and put it to build-deps.

            psergei Sergei Petrunia added a comment - Another thing that file has is: #ifdef HAVE_SSE42 #include <nmmintrin.h> #include <wmmintrin.h> #endif These files are not present on a default Linux install, so at least for .deb packaging we will need to figure out which package has them, and put it to build-deps .
            psergei Sergei Petrunia added a comment - - edited

            It is not compiled in, because our build process does not define HAVE_SSE42, while rocksdb/util/crc32c.cc needs it to be defined:

            static bool isSSE42() {
            		 
            #ifndef HAVE_SSE42
            		 
              return false;
            		 
            #elif defined(__GNUC__) && defined(__x86_64__) && !defined(IOS_CROSS_COMPILE)
            		 
              uint32_t c_;
            		 
              __asm__("cpuid" : "=c"(c_) : "a"(1) : "ebx", "edx");
            		 
              return c_ & (1U << 20);  // copied from CpuId.h in Folly. Test SSE42
            		 
            #elif defined(_WIN64)
            		 
              int info[4];
            		 
              __cpuidex(info, 0x00000001, 0);
            		 
              return (info[2] & ((int)1 << 20)) != 0;
            		 
            #else
            		 
              return false;
            		 
            #endif
            		 
            }

            psergei Sergei Petrunia added a comment - - edited It is not compiled in, because our build process does not define HAVE_SSE42, while rocksdb/util/crc32c.cc needs it to be defined: static bool isSSE42() { #ifndef HAVE_SSE42 return false ; #elif defined(__GNUC__) && defined(__x86_64__) && !defined(IOS_CROSS_COMPILE) uint32_t c_; __asm__( "cpuid" : "=c" (c_) : "a" (1) : "ebx" , "edx" ); return c_ & (1U << 20); // copied from CpuId.h in Folly. Test SSE42 #elif defined(_WIN64) int info[4]; __cpuidex(info, 0x00000001, 0); return (info[2] & (( int )1 << 20)) != 0; #else return false ; #endif }

            People

              wlad Vladislav Vaintroub
              psergei Sergei Petrunia
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                Created:
                Updated:
                Resolved:

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