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-rw-r--r--src/tools/perf/pubdrop.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/src/tools/perf/pubdrop.c b/src/tools/perf/pubdrop.c
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+++ b/src/tools/perf/pubdrop.c
@@ -0,0 +1,325 @@
+//
+// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
+//
+// This software is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt). A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <nng/nng.h>
+#include <nng/supplemental/util/platform.h>
+
+// pubdrop - this is a simple testing utility that lets us measure PUB/SUB
+// performance, including dropped messages, delivery across multiple threads,
+// etc. It actually uses a wild card subscription for now.
+
+#if defined(NNG_HAVE_PUB0) && defined(NNG_HAVE_SUB0)
+#include <nng/protocol/pubsub0/pub.h>
+#include <nng/protocol/pubsub0/sub.h>
+
+#else
+
+static void die(const char *, ...);
+
+static int
+nng_pub0_open(nng_socket *arg)
+{
+ (void) arg;
+ die("Pub protocol enabled in this build!");
+ return (NNG_ENOTSUP);
+}
+
+static int
+nng_sub0_open(nng_socket *arg)
+{
+ (void) arg;
+ die("Sub protocol enabled in this build!");
+ return (NNG_ENOTSUP);
+}
+
+#endif // NNG_HAVE_PUB0....
+
+static void die(const char *, ...);
+static void do_pubdrop(int argc, char **argv);
+static uint64_t nperusec;
+static volatile int x;
+
+void
+work(void)
+{
+ x = rand();
+}
+
+void
+usdelay(unsigned long long nusec)
+{
+ nusec *= nperusec;
+ while (nusec > 0) {
+ work();
+ nusec--;
+ }
+}
+
+int
+main(int argc, char **argv)
+{
+ argc--;
+ argv++;
+
+ // We calculate a delay factor to roughly delay 1 usec. We don't
+ // need this to be perfect, just reproducible on the same host.
+ unsigned long cnt = 1000000;
+
+ nng_time beg = nng_clock();
+ for (unsigned long i = 0; i < cnt; i++) {
+ work();
+ }
+ nng_time end = nng_clock();
+ nperusec = cnt / (1000 * (end - beg));
+
+ do_pubdrop(argc, argv);
+}
+
+static void
+die(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ fprintf(stderr, "\n");
+ exit(2);
+}
+
+static int
+parse_int(const char *arg, const char *what)
+{
+ long val;
+ char *eptr;
+
+ val = strtol(arg, &eptr, 10);
+ // Must be a postive number less than around a billion.
+ if ((val < 0) || (val > (1 << 30)) || (*eptr != 0) || (eptr == arg)) {
+ die("Invalid %s", what);
+ }
+ return ((int) val);
+}
+
+struct pubdrop_args {
+ const char * addr;
+ bool start;
+ unsigned long long msgsize;
+ unsigned long long count;
+ unsigned long long intvl;
+ unsigned long long drops;
+ unsigned long long gaps;
+ unsigned long long errs;
+ unsigned long long recvs;
+ nng_time beg;
+ nng_time end;
+ nng_mtx * mtx;
+ nng_cv * cv;
+};
+
+static void
+pub_server(void *arg)
+{
+ struct pubdrop_args *pa = arg;
+ nng_socket sock;
+ int rv;
+ nng_msg * msg;
+ nng_time start;
+ nng_time end;
+
+ if ((rv = nng_pub0_open(&sock)) != 0) {
+ die("Cannot open sub: %s", nng_strerror(rv));
+ }
+ if ((rv = nng_listen(sock, pa->addr, NULL, 0)) != 0) {
+ die("Cannot listen: %s", nng_strerror(rv));
+ }
+
+ nng_mtx_lock(pa->mtx);
+ while (!pa->start) {
+ nng_cv_wait(pa->cv);
+ }
+ nng_mtx_unlock(pa->mtx);
+
+ start = nng_clock();
+ for (uint64_t i = 0; i < pa->count; i++) {
+ // Unfortunately we need to allocate messages dynamically as we
+ // go. The other option would be to allocate them all up front,
+ // but that could be a rather excessive amount of memory.
+ if ((rv = nng_msg_alloc(&msg, (size_t) pa->msgsize)) != 0) {
+ die("Message alloc failed");
+ }
+ memcpy(nng_msg_body(msg), &i, sizeof(i));
+ if ((rv = nng_sendmsg(sock, msg, 0)) != 0) {
+ die("Sendmsg: %s", nng_strerror(rv));
+ }
+ // It sure would be nice if we had a usec granularity option
+ // here.
+ if (pa->intvl > 0) {
+ usdelay((unsigned long long) pa->intvl);
+ }
+ }
+
+ end = nng_clock();
+
+ nng_msleep(1000); // drain the queue
+ nng_close(sock);
+
+ nng_mtx_lock(pa->mtx);
+ pa->beg = start;
+ pa->end = end;
+ nng_mtx_unlock(pa->mtx);
+}
+
+static void
+sub_client(void *arg)
+{
+ struct pubdrop_args *pa = arg;
+ nng_socket sock;
+ int rv;
+ nng_msg * msg;
+ unsigned long long recvs;
+ unsigned long long drops;
+ unsigned long long gaps;
+ unsigned long long errs;
+ unsigned long long expect;
+
+ if ((rv = nng_sub0_open(&sock)) != 0) {
+ die("Cannot open sub: %s", nng_strerror(rv));
+ }
+ if ((rv = nng_dial(sock, pa->addr, NULL, 0)) != 0) {
+ die("Cannot listen: %s", nng_strerror(rv));
+ }
+ if ((rv = nng_setopt_ms(sock, NNG_OPT_RECONNMINT, 51)) != 0) {
+ die("setopt: %s", nng_strerror(rv));
+ }
+ if ((rv = nng_setopt(sock, NNG_OPT_SUB_SUBSCRIBE, "", 0)) != 0) {
+ die("setopt: %s", nng_strerror(rv));
+ }
+ if ((rv = nng_setopt_ms(sock, NNG_OPT_RECVTIMEO, 10000)) != 0) {
+ die("setopt: %s", nng_strerror(rv));
+ }
+
+ expect = 0;
+ recvs = drops = gaps = errs = 0;
+
+ while (expect < pa->count) {
+ uint64_t got;
+ if ((rv = nng_recvmsg(sock, &msg, 0)) != 0) {
+ if ((rv == NNG_ECLOSED) || (rv == NNG_ETIMEDOUT)) {
+ // Closed without receiving the last message
+ drops += (pa->count - expect);
+ gaps++;
+ break;
+ }
+ printf("ERROR: %s\n", nng_strerror(rv));
+ errs++;
+ break;
+ }
+ recvs++;
+ memcpy(&got, nng_msg_body(msg), sizeof(got));
+ nng_msg_free(msg);
+ if (got != expect) {
+ gaps++;
+ if (got > expect) {
+ drops += (got - expect);
+ } else {
+ die("Misordered delivery");
+ }
+ }
+ expect = got + 1;
+ }
+
+ nng_mtx_lock(pa->mtx);
+ pa->drops += drops;
+ pa->errs += errs;
+ pa->recvs += recvs;
+ pa->gaps += gaps;
+ nng_mtx_unlock(pa->mtx);
+}
+
+static void
+do_pubdrop(int argc, char **argv)
+{
+ nng_thread ** thrs;
+ struct pubdrop_args pa;
+ int rv;
+ int nsubs;
+
+ if (argc != 5) {
+ die("Usage: pubdrop <url> <msg-size> <msg-count> <num-subs> "
+ "<interval>");
+ }
+
+ memset(&pa, 0, sizeof(pa));
+ pa.addr = argv[0];
+ pa.msgsize = parse_int(argv[1], "message size");
+ pa.count = parse_int(argv[2], "count");
+ pa.intvl = parse_int(argv[4], "interval");
+ nsubs = parse_int(argv[3], "#subscribers");
+
+ if (pa.msgsize < sizeof(uint64_t)) {
+ die("Message size too small.");
+ }
+
+ thrs = calloc(sizeof(nng_thread *), (size_t) pa.count + 1);
+ if (((rv = nng_mtx_alloc(&pa.mtx)) != 0) ||
+ ((nng_cv_alloc(&pa.cv, pa.mtx)) != 0)) {
+ die("Startup: %s\n", nng_strerror(rv));
+ };
+
+ if ((rv = nng_thread_create(&thrs[0], pub_server, &pa)) != 0) {
+ die("Cannot create pub thread: %s", nng_strerror(rv));
+ }
+
+ nng_msleep(100); // give time for listener to start...
+
+ for (int i = 0; i < nsubs; i++) {
+ if ((rv = nng_thread_create(&thrs[i + 1], sub_client, &pa)) !=
+ 0) {
+ die("Cannot create sub thread: %s", nng_strerror(rv));
+ }
+ }
+
+ // Sleep a bit for conns to establish.
+ nng_msleep(2000);
+ nng_mtx_lock(pa.mtx);
+ pa.start = true;
+ nng_cv_wake(pa.cv);
+ nng_mtx_unlock(pa.mtx);
+
+ for (int i = 0; i < nsubs + 1; i++) {
+ nng_thread_destroy(thrs[i]);
+ }
+
+ nng_mtx_lock(pa.mtx);
+
+ unsigned long long expect = nsubs * pa.count;
+ unsigned long long missing = nsubs ? expect - pa.recvs : 0;
+ double dur = (pa.end - pa.beg) / 1000.0;
+
+ printf("Sub Sent %llu messages in %.3f sec (%.2f msgs/sec)\n",
+ pa.count, dur, pa.count / dur);
+ printf("Expected %llu messages total\n", expect);
+ printf("Received %llu messages total\n", pa.recvs);
+ printf("Effective rate %.2f msgs/sec\n", pa.recvs / dur);
+ printf("Errors %llu total\n", pa.errs);
+ printf("Reported %llu dropped messages in %llu gaps\n", pa.drops,
+ pa.gaps);
+ printf("Dropped %llu messages (missing)\n", missing);
+ printf("Drop rate %.2f%%\n", expect ? 100.0 * missing / expect : 0);
+
+ nng_mtx_unlock(pa.mtx);
+}
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