X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fio%2Fbenchmarks%2Frun-length-prefix.c;fp=ccan%2Fio%2Fbenchmarks%2Frun-length-prefix.c;h=7d0336348e0028a922afe777b427f4ffa42628ed;hb=8d97cddd18f504409ddb66dfe396798c99c2dfbd;hp=0000000000000000000000000000000000000000;hpb=0a2fd289c7bf57d9fc35ad6af36df4bcc694f361;p=ccan

diff --git a/ccan/io/benchmarks/run-length-prefix.c b/ccan/io/benchmarks/run-length-prefix.c
new file mode 100644
index 00000000..7d033634
--- /dev/null
+++ b/ccan/io/benchmarks/run-length-prefix.c
@@ -0,0 +1,187 @@
+/* Simulate a server with connections of different speeds.  We count
+ * how many connections complete in 10 seconds. */
+#include <ccan/io/io.h>
+#include <ccan/time/time.h>
+#include <ccan/err/err.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <signal.h>
+#include <assert.h>
+
+#define REQUEST_MAX 131072
+#define NUM_CONNS 500 /* per child */
+#define NUM_CHILDREN 2
+
+static unsigned int completed;
+
+struct client {
+	unsigned int len;
+	char *request_buffer;
+};
+
+static struct io_op *write_reply(struct io_conn *conn, struct client *client);
+static struct io_op *read_body(struct io_conn *conn, struct client *client)
+{
+	assert(client->len <= REQUEST_MAX);
+	return io_read(client->request_buffer, client->len,
+		       io_next(conn, write_reply, client));
+}
+
+static struct io_op *read_header(struct io_conn *conn, struct client *client)
+{
+	return io_read(&client->len, sizeof(client->len),
+		       io_next(conn, read_body, client));
+}
+
+/* once we're done, loop again. */
+static struct io_op *write_complete(struct io_conn *conn, struct client *client)
+{
+	completed++;
+	return read_header(conn, client);
+}
+
+static struct io_op *write_reply(struct io_conn *conn, struct client *client)
+{
+	return io_write(&client->len, sizeof(client->len),
+			io_next(conn, write_complete, client));
+}
+
+/* This runs in the child. */
+static void create_clients(struct sockaddr_un *addr, int waitfd)
+{
+	struct client data;
+	int i, sock[NUM_CONNS], len[NUM_CONNS], done[NUM_CONNS],
+		result[NUM_CONNS], count = 0;
+
+	for (i = 0; i < NUM_CONNS; i++) {
+		len[i] = (random() % REQUEST_MAX) + 1;
+		sock[i] = socket(AF_UNIX, SOCK_STREAM, 0);
+		if (sock[i] < 0)
+			err(1, "creating socket");
+		if (connect(sock[i], (void *)addr, sizeof(*addr)) != 0)
+			err(1, "connecting socket");
+		/* Make nonblocking. */
+		fcntl(sock[i], F_SETFD, fcntl(sock[i], F_GETFD)|O_NONBLOCK);
+		done[i] = 0;
+	}
+
+	read(waitfd, &i, 1);
+
+	for (;;) {
+		for (i = 0; i < NUM_CONNS; i++) {
+			int ret, totlen = len[i] + sizeof(len[i]);
+			if (done[i] < sizeof(len[i]) + len[i]) {
+				data.len = len[i];
+				ret = write(sock[i], (void *)&data + done[i],
+					    totlen - done[i]);
+				if (ret > 0)
+					done[i] += ret;
+				else if (ret < 0 && errno != EAGAIN)
+					goto fail;
+			} else {
+				int off = done[i] - totlen;
+				ret = read(sock[i], (void *)&result[i] + off,
+					   sizeof(result[i]) - off);
+				if (ret > 0) {
+					done[i] += ret;
+					if (done[i] == totlen
+					    + sizeof(result[i])) {
+						assert(result[i] == len[i]);
+						count++;
+						done[i] = 0;
+					}
+				} else if (ret < 0 && errno != EAGAIN)
+					goto fail;
+			}
+		}
+	}
+fail:
+	printf("Child did %u\n", count);
+	exit(0);
+}
+
+static int timeout[2];
+static void sigalarm(int sig)
+{
+	write(timeout[1], "1", 1);
+}
+
+static struct io_op *do_timeout(struct io_conn *conn, char *buf)
+{
+	return io_break(conn, NULL);
+}
+
+static struct io_op *do_timeout_read(struct io_conn *conn, char *buf)
+{
+	return io_read(buf, 1, io_next(conn, do_timeout, buf));
+}
+
+int main(int argc, char *argv[])
+{
+	unsigned int i, j;
+	struct sockaddr_un addr;
+	struct timespec start, end;
+	char buffer[REQUEST_MAX];
+	int fd, wake[2];
+	char buf;
+
+	addr.sun_family = AF_UNIX;
+	sprintf(addr.sun_path, "/tmp/run-different-speed.sock.%u", getpid());
+
+	if (pipe(wake) != 0 || pipe(timeout) != 0)
+		err(1, "Creating pipes");
+
+	fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (fd < 0)
+		err(1, "Creating socket");
+
+	if (bind(fd, (void *)&addr, sizeof(addr)) != 0)
+		err(1, "Binding to %s", addr.sun_path);
+
+	if (listen(fd, NUM_CONNS) != 0)
+		err(1, "Listening on %s", addr.sun_path);
+
+	for (i = 0; i < NUM_CHILDREN; i++) {
+		switch (fork()) {
+		case -1:
+			err(1, "forking");
+		case 0:
+			close(wake[1]);
+			create_clients(&addr, wake[0]);
+			break;
+		}
+		for (j = 0; j < NUM_CONNS; j++) {
+			struct client *client = malloc(sizeof(*client));
+			int ret = accept(fd, NULL, 0);
+			if (ret < 0)
+				err(1, "Accepting fd");
+			/* For efficiency, we share buffer */
+			client->request_buffer = buffer;
+			io_new_conn(ret, read_header, NULL, client);
+		}
+	}
+
+	io_new_conn(timeout[0], do_timeout_read, NULL, &buf);
+
+	close(wake[0]);
+	for (i = 0; i < NUM_CHILDREN; i++)
+		write(wake[1], "1", 1);
+
+	signal(SIGALRM, sigalarm);
+	alarm(10);
+	start = time_now();
+	io_loop();
+	end = time_now();
+	close(fd);
+
+	printf("%u connections complete (%u ns per conn)\n",
+	       completed,
+	       (int)time_to_nsec(time_divide(time_sub(end, start), completed)));
+	return 0;
+}