test: add key processing benchmark

This runs a bunch of random keys against xkb_state_update_key() and
xkb_state_key_get_one_sym(), in a fairly unintelligent way.

It might be nice to check when modifying this code path, or changing it,
to see things haven't slowed down considerably. However, given the
numbers this benchmark gives, it is pretty clear that we are not going
to be the bottleneck for anything. So this can more-or-less be ignored.

Incidentally, this also turned out to be a poor man's fuzzer, because it
turned up the fix in the previous commit. Maybe we should consider
beefing it up with an actual 'break stuff' intention and running it as
part of 'make check'.

Signed-off-by: Ran Benita <ran234@gmail.com>

Makefile.am

@@ -156,12 +156,14 @@ test_log_LDADD = $(TESTS_LDADD)
 test_interactive_LDADD = $(TESTS_LDADD)
 test_rmlvo_to_kccgst_LDADD = $(TESTS_LDADD)
 test_print_compiled_keymap_LDADD = $(TESTS_LDADD)
+test_bench_key_proc_LDADD = $(TESTS_LDADD) -lrt
 
 check_PROGRAMS = \
 	$(TESTS) \
 	test/interactive \
 	test/rmlvo-to-kccgst \
-	test/print-compiled-keymap
+	test/print-compiled-keymap \
+	test/bench-key-proc
 
 EXTRA_DIST = \
 	test/data \

test/.gitignore

@@ -12,3 +12,4 @@ log
 interactive
 rmlvo-to-kccgst
 print-compiled-keymap
+bench-key-proc

test/bench-key-proc.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright © 2012 Ran Benita <ran234@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <time.h>
+#include <linux/input.h>
+
+#include "test.h"
+
+#define BENCHMARK_ITERATIONS 20000000
+
+static void
+bench(struct xkb_state *state)
+{
+    int8_t keys[256] = { 0 };
+    xkb_keycode_t keycode;
+    xkb_keysym_t keysym;
+    int i;
+
+    for (i = 0; i < BENCHMARK_ITERATIONS; i++) {
+        keycode = (rand() % (255 - 9)) + 9;
+        if (keys[keycode]) {
+            xkb_state_update_key(state, keycode, XKB_KEY_UP);
+            keys[keycode] = 0;
+            keysym = xkb_state_key_get_one_sym(state, keycode);
+            (void) keysym;
+        } else {
+            xkb_state_update_key(state, keycode, XKB_KEY_DOWN);
+            keys[keycode] = 1;
+        }
+    }
+}
+
+int
+main(void)
+{
+    struct xkb_context *ctx;
+    struct xkb_keymap *keymap;
+    struct xkb_state *state;
+    struct timespec start, stop, elapsed;
+
+    ctx = test_get_context();
+    assert(ctx);
+
+    keymap = test_compile_rules(ctx, "evdev", "pc104", "us,ru,il,de",
+                                ",,,neo", "grp:menu_toggle");
+    assert(keymap);
+
+    state = xkb_state_new(keymap);
+    assert(state);
+
+    xkb_context_set_log_level(ctx, XKB_LOG_LEVEL_CRITICAL);
+    xkb_context_set_log_verbosity(ctx, 0);
+
+    srand(time(NULL));
+
+    clock_gettime(CLOCK_MONOTONIC, &start);
+    bench(state);
+    clock_gettime(CLOCK_MONOTONIC, &stop);
+
+    elapsed.tv_sec = stop.tv_sec - start.tv_sec;
+    elapsed.tv_nsec = stop.tv_nsec - start.tv_nsec;
+    if (elapsed.tv_nsec < 0) {
+        elapsed.tv_nsec += 1000000000;
+        elapsed.tv_sec--;
+    }
+
+    fprintf(stderr, "ran %d iterations in %ld.%09lds\n",
+            BENCHMARK_ITERATIONS, elapsed.tv_sec, elapsed.tv_nsec);
+
+    xkb_state_unref(state);
+    xkb_keymap_unref(keymap);
+    xkb_context_unref(ctx);
+
+    return 0;
+}