Stop doing find_stream() every time we send out data; it takes some CPU.

diff --git a/server.cpp b/server.cpp
index c8d688996bfa5dcbc48870b98430c7d8d18e3813..855e21c9767587fba2590fccadb47cdb5de852c5 100644 (file)
--- a/server.cpp
+++ b/server.cpp
@@ -26,17 +26,19 @@ using namespace std;
 Client::Client(int sock)
        : sock(sock),
          state(Client::READING_REQUEST),
+         stream(NULL),
          header_or_error_bytes_sent(0),
          bytes_sent(0)
 {
        request.reserve(1024);
 }
        
-Client::Client(const ClientProto &serialized)
+Client::Client(const ClientProto &serialized, Stream *stream)
        : sock(serialized.sock()),
          state(State(serialized.state())),
          request(serialized.request()),
          stream_id(serialized.stream_id()),
+         stream(stream),
          header_or_error(serialized.header_or_error()),
          header_or_error_bytes_sent(serialized.header_or_error_bytes_sent()),
          bytes_sent(serialized.bytes_sent())
@@ -211,7 +213,8 @@ void Server::add_client(int sock)
 void Server::add_client_from_serialized(const ClientProto &client)
 {
        MutexLock lock(&mutex);
-       clients.insert(make_pair(client.sock(), Client(client)));
+       Stream *stream = find_stream(client.stream_id());
+       clients.insert(make_pair(client.sock(), Client(client, stream)));
 
        // Start listening on data from this socket.
        epoll_event ev;
@@ -398,20 +401,20 @@ sending_header_or_error_again:
                // but we'll start sending immediately as we get data.
                // This is postcondition #3.
                client->state = Client::SENDING_DATA;
-               client->bytes_sent = find_stream(client->stream_id)->data_size;
+               client->bytes_sent = client->stream->data_size;
                sleeping_clients.push_back(client);
                return;
        }
        case Client::SENDING_DATA: {
                // See if there's some data we've lost. Ideally, we should drop to a block boundary,
                // but resync will be the mux's problem.
-               const Stream &stream = *find_stream(client->stream_id);
-               size_t bytes_to_send = stream.data_size - client->bytes_sent;
+               const Stream *stream = client->stream;
+               size_t bytes_to_send = stream->data_size - client->bytes_sent;
                if (bytes_to_send > BACKLOG_SIZE) {
                        fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
                                client->sock,
                                (long long int)(bytes_to_send - BACKLOG_SIZE));
-                       client->bytes_sent = find_stream(client->stream_id)->data_size - BACKLOG_SIZE;
+                       client->bytes_sent = stream->data_size - BACKLOG_SIZE;
                        bytes_to_send = BACKLOG_SIZE;
                }
 
@@ -421,10 +424,10 @@ sending_header_or_error_again:
                        size_t bytes_first_part = BACKLOG_SIZE - (client->bytes_sent % BACKLOG_SIZE);
 
                        iovec iov[2];
-                       iov[0].iov_base = const_cast<char *>(stream.data + (client->bytes_sent % BACKLOG_SIZE));
+                       iov[0].iov_base = const_cast<char *>(stream->data + (client->bytes_sent % BACKLOG_SIZE));
                        iov[0].iov_len = bytes_first_part;
 
-                       iov[1].iov_base = const_cast<char *>(stream.data);
+                       iov[1].iov_base = const_cast<char *>(stream->data);
                        iov[1].iov_len = bytes_to_send - bytes_first_part;
 
                        do {
@@ -433,7 +436,7 @@ sending_header_or_error_again:
                } else {
                        do {
                                ret = write(client->sock,
-                                           stream.data + (client->bytes_sent % BACKLOG_SIZE),
+                                           stream->data + (client->bytes_sent % BACKLOG_SIZE),
                                            bytes_to_send);
                        } while (ret == -1 && errno == EINTR);
                }
@@ -451,7 +454,7 @@ sending_header_or_error_again:
                }
                client->bytes_sent += ret;
 
-               if (client->bytes_sent == stream.data_size) {
+               if (client->bytes_sent == stream->data_size) {
                        // We don't have any more data for this client, so put it to sleep.
                        // This is postcondition #3.
                        put_client_to_sleep(client);
@@ -485,6 +488,7 @@ int Server::parse_request(Client *client)
        }
 
        client->stream_id = request_tokens[1];
+       client->stream = streams[client->stream_id];
        client->request.clear();
 
        return 200;  // OK!

diff --git a/server.h b/server.h
index 24e2fcbac3a737a91211bed9eea590d9d1c1a86a..fd309f41e34e1b97434f5af0071f9a47e4ad6690 100644 (file)
--- a/server.h
+++ b/server.h
@@ -15,6 +15,7 @@
 
 class ClientProto;
 class CubemapStateProto;
+class Stream;
 class StreamProto;
 
 struct Client {
@@ -22,7 +23,7 @@ struct Client {
        Client(int sock);
 
        // Serialization/deserialization.
-       Client(const ClientProto &serialized);
+       Client(const ClientProto &serialized, Stream *stream);
        ClientProto serialize() const;
 
        // The file descriptor associated with this socket.
@@ -38,6 +39,7 @@ struct Client {
        // What stream we're connecting to; parsed from <request>.
        // Not relevant for READING_REQUEST.
        std::string stream_id;
+       Stream *stream;
 
        // The header we want to send. This is nominally a copy of Stream::header,
        // but since that might change on reconnects etc., we keep a local copy here.