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http2: shrink default `vector::reserve()` allocations

Allocating memory upfront comes with overhead, and in particular,
`std::vector` implementations do not necessarily return memory
to the system when one might expect that (e.g. after shrinking the
vector).

Backport-PR-URL: #29123
PR-URL: #29122
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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addaleax authored and BethGriggs committed Aug 10, 2019
1 parent f4242e2 commit 460f896c631f1be52b0ab6c9f30e0b66f601b2a1
Showing with 2 additions and 2 deletions.
  1. +2 −2 src/node_http2.cc
@@ -632,7 +632,7 @@ Http2Session::Http2Session(Environment* env,
// fails.
CHECK_EQ(fn(&session_, callbacks, this, *opts, *allocator_info), 0);

outgoing_storage_.reserve(4096);
outgoing_storage_.reserve(1024);
outgoing_buffers_.reserve(32);

{
@@ -1947,7 +1947,7 @@ Http2Stream::Http2Stream(Http2Session* session,
if (max_header_pairs_ == 0) {
max_header_pairs_ = DEFAULT_MAX_HEADER_LIST_PAIRS;
}
current_headers_.reserve(max_header_pairs_);
current_headers_.reserve(std::min(max_header_pairs_, 12u));

// Limit the number of header octets
max_header_length_ =

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