regressions/ck_sequence: Add fast-path latency measurement.

regressions/Makefile

@@ -45,6 +45,7 @@ all:
 	$(MAKE) -C ./ck_bytelock/benchmark all
 	$(MAKE) -C ./ck_epoch/validate all
 	$(MAKE) -C ./ck_sequence/validate all
+	$(MAKE) -C ./ck_sequence/benchmark all
 	$(MAKE) -C ./ck_stack/validate all
 	$(MAKE) -C ./ck_stack/benchmark all
 	$(MAKE) -C ./ck_ring/validate all
@@ -83,6 +84,7 @@ clean:
 	$(MAKE) -C ./ck_bytelock/benchmark clean
 	$(MAKE) -C ./ck_epoch/validate clean
 	$(MAKE) -C ./ck_sequence/validate clean
+	$(MAKE) -C ./ck_sequence/benchmark clean
 	$(MAKE) -C ./ck_stack/validate clean
 	$(MAKE) -C ./ck_stack/benchmark clean
 	$(MAKE) -C ./ck_ring/validate clean

regressions/ck_sequence/benchmark/Makefile

@@ -0,0 +1,18 @@
+.PHONY: clean distribution
+
+OBJECTS=ck_sequence
+
+all: $(OBJECTS)
+
+ck_sequence: ck_sequence.c ../../../include/ck_sequence.h
+	$(CC) $(CFLAGS) -o ck_sequence ck_sequence.c
+
+check: all
+	./ck_sequence $(CORES) 1
+
+clean:
+	rm -rf *~ *.o $(OBJECTS) *.dSYM *.exe
+
+include ../../../build/regressions.build
+CFLAGS+=-D_GNU_SOURCE
+

regressions/ck_sequence/benchmark/ck_sequence.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2013 Samy Al Bahra.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <ck_cc.h>
+#include <ck_sequence.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "../../common.h"
+
+#ifndef STEPS
+#define STEPS (65536 * 64)
+#endif
+
+static ck_sequence_t seqlock CK_CC_CACHELINE = CK_SEQUENCE_INITIALIZER;
+
+int
+main(void)
+{
+	unsigned int i = 0;
+	uint64_t a, s;
+
+	/* Read-side latency. */
+	a = 0;
+	for (i = 0; i < STEPS / 4; i++) {
+		s = rdtsc();
+		ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock));
+		ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock));
+		ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock));
+		ck_sequence_read_retry(&seqlock, ck_sequence_read_begin(&seqlock));
+		a += rdtsc() - s;
+	}
+	printf("read: %" PRIu64 "\n", a / STEPS);
+
+	/* Write-side latency. */
+	a = 0;
+	for (i = 0; i < STEPS / 4; i++) {
+		s = rdtsc();
+		ck_sequence_write_begin(&seqlock);
+		ck_sequence_write_end(&seqlock);
+		ck_sequence_write_begin(&seqlock);
+		ck_sequence_write_end(&seqlock);
+		ck_sequence_write_begin(&seqlock);
+		ck_sequence_write_end(&seqlock);
+		ck_sequence_write_begin(&seqlock);
+		ck_sequence_write_end(&seqlock);
+		a += rdtsc() - s;
+	}
+	printf("write: %" PRIu64 "\n", a / STEPS);
+
+        return 0;
+}
+