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Dub version Dub downloads License

CPU Information

void main()
    import std.stdio;
    import cpuid.unified;

    enum fmt = "%14s: %s";

    fmt.writefln("cores", cores);
    fmt.writefln("threads", threads);

    fmt.writefln("data caches", dCache.length);
    fmt.writefln("code caches", iCache.length);
    fmt.writefln("unified caches", uCache.length);

    fmt.writefln("data TLBs", dTlb.length);
    fmt.writefln("code TLBs", iTlb.length);
    fmt.writefln("unified TLBs", uTlb.length);

This package also can be used as workaround for core.cpuid Issue 16028.



See all reports.

Run the following command from the project's directory to receive a report about your CPU

dub --single report.d

Please report dub log in a new GitHub issue!

See also output example.

Building a betterC library

BetterC mode works when compiled with LDC only.

dub build --compiler=ldmd2 --build-mode=singleFile --parallel

API Features

  • API was split to unified, target specified, and vendor specified parts.
  • Complex cache topology (number of cores per cache) is supported. This feature is required by ARM CPUs.
  • Translation lookaside buffers are supported. They are used in server and math software, for example cache optimized BLAS requires TLB information.
  • Caches and TLBs are split into three types:
    • Data
    • Instruction (code)
    • Unified (data and code)
  • _cpuid function is available for x86/x86-64 targets.

Implementation Features

  • The library was written completely from scratch.
  • Code is clean and simple.
  • Unions and mir.bitmanip.bitfields are used instead of bit operations.
  • Slim betterC library with extern(C) insterface.


  • Add information about recent features like AVX2, AVX512F.
  • Add information about ARM target and ARM vendors.
  • Test a lot of different CPUs.
  • Extend testing infrastructure.
  • CPU(package) count identification.
  • Per CPU(package) CPUID information.