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nghttpx: Use an existing h2 backend connection as much as possible 

h2load measurement reveals that this strategy is 3 times faster than
the previous implementations.
This commit is contained in:
Tatsuhiro Tsujikawa 2017-10-19 21:15:08 +09:00
parent aaa0b858e4
commit f507b5eee4
1 changed files with 30 additions and 46 deletions
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32
src/shrpx_client_handler.cc
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@ -804,28 +804,8 @@ bool load_lighter(const DownstreamAddr *lhs, const DownstreamAddr *rhs) {
Http2Session *ClientHandler::select_http2_session(
const std::shared_ptr<DownstreamAddrGroup> &group) {
auto &shared_addr = group->shared_addr;
// First count the working backend addresses.
size_t min = 0;
for (const auto &addr : shared_addr->addrs) {
if (addr.proto != PROTO_HTTP2 || addr.connect_blocker->blocked()) {
continue;
}
++min;
}
if (min == 0) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "No working backend address found";
}
return nullptr;
}
auto &http2_avail_freelist = shared_addr->http2_avail_freelist;
if (http2_avail_freelist.size() >= min) {
for (auto session = http2_avail_freelist.head; session;) {
auto next = session->dlnext;
@ -835,8 +815,8 @@ Http2Session *ClientHandler::select_http2_session(
if (session->max_concurrency_reached(0)) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this)
<< "Maximum streams have been reached for Http2Session("
<< session << "). Skip it";
<< "Maximum streams have been reached for Http2Session(" << session
<< "). Skip it";
}
session = next;
@ -859,7 +839,6 @@ Http2Session *ClientHandler::select_http2_session(
}
return session;
}
}
DownstreamAddr *selected_addr = nullptr;
@ -901,7 +880,12 @@ Http2Session *ClientHandler::select_http2_session(
}
}
assert(selected_addr);
if (selected_addr == nullptr) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "No working backend address found";
}
return nullptr;
}
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Selected DownstreamAddr=" << selected_addr