GeezerVison

000000000098fba0 <node::http2::PackSettings(v8::FunctionCallbackInfo<v8::Value> const&)>:
  98fba0:       f3 0f 1e fa             endbr64 
  98fba4:       55                      push   %rbp
  98fba5:       48 89 e5                mov    %rsp,%rbp
  98fba8:       53                      push   %rbx
  98fba9:       48 89 fb                mov    %rdi,%rbx
  98fbac:       48 83 ec 08             sub    $0x8,%rsp
  98fbb0:       48 8b 07                mov    (%rdi),%rax
  98fbb3:       48 8b 78 08             mov    0x8(%rax),%rdi
  98fbb7:       e8 34 5f 1e 00          call   b75af0 <v8::Isolate::GetCurrentContext()>
  98fbbc:       31 d2                   xor    %edx,%edx
  98fbbe:       48 b9 97 8c 9a 0f 31    movabs $0x310f9a8c97,%rcx
  98fbc5:       00 00 00 
  98fbc8:       48 8b 00                mov    (%rax),%rax
  98fbcb:       48 8b 40 2f             mov    0x2f(%rax),%rax
  98fbcf:       48 8b b8 27 01 00 00    mov    0x127(%rax),%rdi
  98fbd6:       48 89 c8                mov    %rcx,%rax
  98fbd9:       48 f7 77 08             divq   0x8(%rdi)
  98fbdd:       48 89 d6                mov    %rdx,%rsi
  98fbe0:       48 8d 15 d9 23 39 04    lea    0x43923d9(%rip),%rdx        # 4d21fc0 <node::http2::Http2State::type_name>
  98fbe7:       e8 24 d1 f8 ff          call   91cd10 <std::_Hashtable<node::FastStringKey, std::pair<node::FastStringKey const, node::BaseObjectPtrImpl<node::BaseObject, false> >, std::allocator<std::pair<node::FastStringKey const, node::BaseObjectPtrImpl<node::BaseObject, false> > >, std::__detail::_Select1st, std::equal_to<node::FastStringKey>, node::FastStringKey::Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, false, true> >::_M_find_before_node(unsigned long, node::FastStringKey const&, unsigned long) const>
  98fbec:       48 89 c7                mov    %rax,%rdi
  98fbef:       48 85 c0                test   %rax,%rax
  98fbf2:       74 0c                   je     98fc00 <node::http2::PackSettings(v8::FunctionCallbackInfo<v8::Value> const&)+0x60>
  98fbf4:       48 8b 38                mov    (%rax),%rdi
  98fbf7:       48 85 ff                test   %rdi,%rdi
  98fbfa:       74 04                   je     98fc00 <node::http2::PackSettings(v8::FunctionCallbackInfo<v8::Value> const&)+0x60>
  98fbfc:       48 8b 7f 20             mov    0x20(%rdi),%rdi
  98fc00:       48 8b 1b                mov    (%rbx),%rbx
  98fc03:       e8 78 94 fe ff          call   979080 <node::http2::Http2Settings::Pack(node::http2::Http2State*)>
  98fc08:       48 85 c0                test   %rax,%rax
  98fc0b:       74 13                   je     98fc20 <node::http2::PackSettings(v8::FunctionCallbackInfo<v8::Value> const&)+0x80>
  98fc0d:       48 8b 00                mov    (%rax),%rax
  98fc10:       48 89 43 18             mov    %rax,0x18(%rbx)
  98fc14:       48 8b 5d f8             mov    -0x8(%rbp),%rbx
  98fc18:       c9                      leave  
  98fc19:       c3                      ret    
  98fc1a:       66 0f 1f 44 00 00       nopw   0x0(%rax,%rax,1)
  98fc20:       48 8b 43 10             mov    0x10(%rbx),%rax
  98fc24:       48 89 43 18             mov    %rax,0x18(%rbx)
  98fc28:       48 8b 5d f8             mov    -0x8(%rbp),%rbx
  98fc2c:       c9                      leave  
  98fc2d:       c3                      ret    
  98fc2e:       66 90                   xchg   %ax,%ax

'use strict';

const encoder = new TextEncoder('utf-8');
const arr = new Uint8Array(1000);
const str = new Date().toISOString();

let result = [];
for (let i = 0; i < 1000000; ++i) {
  result = encoder.encodeInto(str, arr);
}

console.log(result);

 [C++]:
   ticks  total  nonlib   name
     22   11.4%   12.4%  node::builtins::BuiltinLoader::CompileFunction(v8::FunctionCallbackInfo<v8::Value> const&)
     21   10.9%   11.8%  node::encoding_binding::BindingData::EncodeInto(v8::FunctionCallbackInfo<v8::Value> const&)
     14    7.3%    7.9%  fputc@@GLIBC_2.2.5
     12    6.2%    6.7%  __write@@GLIBC_2.2.5
      7    3.6%    3.9%  std::_Hashtable<node::FastStringKey, std::pair<node::FastStringKey const, node::BaseObjectPtrImpl<node::BaseObject, false> >, std::allocator<std::pair<node::FastStringKey const, node::BaseObjectPtrImpl<node::BaseObject, false> > >, std::__detail::_Select1st, std::equal_to<node::FastStringKey>, node::FastStringKey::Hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, false, true> >::_M_find_before_node(unsigned long, node::FastStringKey const&, unsigned long) const

AddBindingData node::process::BindingData
Bucket count 2
Bucket #0:
Bucket #1: [node::process::BindingData]
AddBindingData node::fs::BindingData
Bucket count 2
Bucket #0:
Bucket #1: [node::fs::BindingData][node::process::BindingData]
AddBindingData node::BlobBindingData
Bucket count 5
Bucket #0: [node::fs::BindingData]
Bucket #0:
Bucket #0:
Bucket #0:
Bucket #0: [node::BlobBindingData][node::process::BindingData]
AddBindingData node::encoding_binding::BindingData
Bucket count 5
Bucket #0: [node::encoding_binding::BindingData][node::fs::BindingData]
Bucket #1:
Bucket #2:
Bucket #3:
Bucket #4: [node::BlobBindingData][node::process::BindingData]