message: common: bump arena size to 16 GB
  Closes
diff: @@ -95,7 +95,7 @@ static constexpr std::chrono::milliseconds kMeshPeriodMs{100}; // 100 ms
  // controls aspects of miniheaps
  static constexpr size_t kMaxMeshes = 256; // 1 per bit
  -static constexpr size_t kArenaSize = 8ULL * 1024ULL * 1024ULL * 1024ULL; // 8 GB
  +static constexpr size_t kArenaSize = 16ULL * 1024ULL * 1024ULL * 1024ULL; // 16 GB
  static constexpr size_t kAltStackSize = 16 * 1024UL; // 16k sigaltstacks
  #define SIGQUIESCE (SIGRTMIN + 7)
  #define SIGDUMP (SIGRTMIN + 8)
  