[dpdk-dev] [PATCH v4 3/3] test: add tests for reciprocal based division
Pavan Nikhilesh
pbhagavatula at caviumnetworks.com
Tue Sep 5 12:48:52 CEST 2017
From: Pavan Bhagavatula <pbhagavatula at caviumnetworks.com>
This commit provides a set of tests for verifying the correctness and
performance of both unsigned 32 and 64bit reciprocal based division.
Signed-off-by: Pavan Nikhilesh <pbhagavatula at caviumnetworks.com>
---
test/test/Makefile | 2 +
test/test/test_reciprocal_division.c | 109 +++++++++++++++++
test/test/test_reciprocal_division_perf.c | 193 ++++++++++++++++++++++++++++++
3 files changed, 304 insertions(+)
create mode 100644 test/test/test_reciprocal_division.c
create mode 100644 test/test/test_reciprocal_division_perf.c
diff --git a/test/test/Makefile b/test/test/Makefile
index 42d9a49..6017862 100644
--- a/test/test/Makefile
+++ b/test/test/Makefile
@@ -94,6 +94,8 @@ SRCS-y += test_cycles.c
SRCS-y += test_spinlock.c
SRCS-y += test_memory.c
SRCS-y += test_memzone.c
+SRCS-y += test_reciprocal_division.c
+SRCS-y += test_reciprocal_division_perf.c
SRCS-y += test_ring.c
SRCS-y += test_ring_perf.c
diff --git a/test/test/test_reciprocal_division.c b/test/test/test_reciprocal_division.c
new file mode 100644
index 0000000..771ea64
--- /dev/null
+++ b/test/test/test_reciprocal_division.c
@@ -0,0 +1,109 @@
+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium, Inc. 2017.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Cavium, Inc nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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 "test.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <rte_common.h>
+#include <rte_cycles.h>
+#include <rte_random.h>
+#include <rte_reciprocal.h>
+
+#define MAX_ITERATIONS 1000000
+#define DIVIDE_ITER 100
+
+static int
+test_reciprocal_division(void)
+{
+ int i;
+ int result = 0;
+ uint32_t divisor_u32 = 0;
+ uint32_t dividend_u32;
+ uint32_t nresult_u32;
+ uint32_t rresult_u32;
+ uint64_t divisor_u64 = 0;
+ uint64_t dividend_u64;
+ uint64_t nresult_u64;
+ uint64_t rresult_u64;
+ struct rte_reciprocal_u32 reci_u32;
+ struct rte_reciprocal_u64 reci_u64;
+
+ rte_srand(rte_rdtsc());
+ printf("Validating unsigned 32bit division.\n");
+ for (i = 0; i < MAX_ITERATIONS; i++) {
+ /* Change divisor every DIVIDE_ITER iterations. */
+ if (i % DIVIDE_ITER == 0) {
+ divisor_u32 = rte_rand();
+ reci_u32 = rte_reciprocal_value_u32(divisor_u32);
+ }
+
+ dividend_u32 = rte_rand();
+ nresult_u32 = dividend_u32 / divisor_u32;
+ rresult_u32 = rte_reciprocal_divide_u32(dividend_u32,
+ &reci_u32);
+ if (nresult_u32 != rresult_u32) {
+ printf("Division failed, expected %"PRIu32" "
+ "result %"PRIu32"",
+ nresult_u32, rresult_u32);
+ result = 1;
+ break;
+ }
+ }
+
+ printf("Validating unsigned 64bit division.\n");
+ for (i = 0; i < MAX_ITERATIONS; i++) {
+ /* Change divisor every DIVIDE_ITER iterations. */
+ if (i % DIVIDE_ITER == 0) {
+ divisor_u64 = rte_rand();
+ reci_u64 = rte_reciprocal_value_u64(divisor_u64);
+ }
+
+ dividend_u64 = rte_rand();
+ nresult_u64 = dividend_u64 / divisor_u64;
+ rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
+ &reci_u64);
+ if (nresult_u64 != rresult_u64) {
+ printf("Division failed, expected %"PRIu64" "
+ "result %"PRIu64"",
+ nresult_u64, rresult_u64);
+ result = 1;
+ break;
+ }
+ }
+
+ return result;
+}
+
+REGISTER_TEST_COMMAND(reciprocal_division, test_reciprocal_division);
diff --git a/test/test/test_reciprocal_division_perf.c b/test/test/test_reciprocal_division_perf.c
new file mode 100644
index 0000000..e69cf39
--- /dev/null
+++ b/test/test/test_reciprocal_division_perf.c
@@ -0,0 +1,193 @@
+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium, Inc. 2017.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Cavium, Inc nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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 "test.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <rte_common.h>
+#include <rte_cycles.h>
+#include <rte_random.h>
+#include <rte_reciprocal.h>
+
+#define MAX_ITERATIONS 1000000
+#define DIVIDE_ITER 100
+
+static int
+test_reciprocal_division_perf(void)
+{
+ int result = 0;
+ uint32_t divisor_u32 = 0;
+ volatile uint32_t dividend_u32;
+ uint32_t nresult_u32;
+ uint32_t rresult_u32;
+ uint64_t divisor_u64 = 0;
+ volatile uint64_t dividend_u64;
+ uint64_t nresult_u64;
+ uint64_t rresult_u64;
+ uint64_t start_cyc;
+ uint64_t split_cyc;
+ uint64_t end_cyc;
+ uint64_t tot_cyc_n = 0;
+ uint64_t tot_cyc_r = 0;
+ uint64_t i;
+ struct rte_reciprocal_u32 reci_u32 = {0};
+ struct rte_reciprocal_u64 reci_u64 = {0};
+
+ rte_srand(rte_rdtsc());
+
+ printf("Validating unsigned 32bit division.\n");
+
+ for (i = 0; i < MAX_ITERATIONS; i++) {
+ /* Change divisor every DIVIDE_ITER iterations. */
+ if (i % DIVIDE_ITER == 0) {
+ divisor_u32 = rte_rand();
+ reci_u32 = rte_reciprocal_value_u32(divisor_u32);
+ }
+
+ dividend_u32 = rte_rand();
+
+ start_cyc = rte_rdtsc();
+ nresult_u32 = dividend_u32 / divisor_u32;
+ split_cyc = rte_rdtsc();
+ rresult_u32 = rte_reciprocal_divide_u32(dividend_u32,
+ &reci_u32);
+ end_cyc = rte_rdtsc();
+
+ tot_cyc_n += split_cyc - start_cyc;
+ tot_cyc_r += end_cyc - split_cyc;
+ if (nresult_u32 != rresult_u32) {
+ printf("Division failed, expected %"PRIu32" "
+ "result %"PRIu32"",
+ nresult_u32, rresult_u32);
+ result = 1;
+ break;
+ }
+ }
+ printf("32bit Division results:\n");
+ printf("Total number of cycles normal division : %"PRIu64"\n",
+ tot_cyc_n);
+ printf("Total number of cycles reciprocal division : %"PRIu64"\n",
+ tot_cyc_r);
+ printf("Cycles per division(normal) : %3.2f\n",
+ ((double)tot_cyc_n)/i);
+ printf("Cycles per division(normal) : %3.2f\n\n",
+ ((double)tot_cyc_r)/i);
+
+ tot_cyc_n = 0;
+ tot_cyc_r = 0;
+
+ printf("Validating unsigned 64bit division.\n");
+
+ for (i = 0; i < MAX_ITERATIONS; i++) {
+ /* Change divisor every DIVIDE_ITER iterations. */
+ if (i % DIVIDE_ITER == 0) {
+ divisor_u64 = rte_rand();
+ reci_u64 = rte_reciprocal_value_u64(divisor_u64);
+ }
+
+ dividend_u64 = rte_rand();
+
+ start_cyc = rte_rdtsc();
+ nresult_u64 = dividend_u64 / divisor_u64;
+ split_cyc = rte_rdtsc();
+ rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
+ &reci_u64);
+ end_cyc = rte_rdtsc();
+
+ tot_cyc_n += split_cyc - start_cyc;
+ tot_cyc_r += end_cyc - split_cyc;
+ if (nresult_u64 != rresult_u64) {
+ printf("Division failed, expected %"PRIu64" "
+ "result %"PRIu64"",
+ nresult_u64, rresult_u64);
+ result = 1;
+ break;
+ }
+ }
+ printf("64bit Division results:\n");
+ printf("Total number of cycles normal division : %"PRIu64"\n",
+ tot_cyc_n);
+ printf("Total number of cycles reciprocal division : %"PRIu64"\n",
+ tot_cyc_r);
+ printf("Cycles per division(normal) : %3.2f\n",
+ ((double)tot_cyc_n)/i);
+ printf("Cycles per division(normal) : %3.2f\n\n",
+ ((double)tot_cyc_r)/i);
+
+ tot_cyc_n = 0;
+ tot_cyc_r = 0;
+
+ printf("Validating unsigned 64bit division with 32bit divisor.\n");
+
+ for (i = 0; i < MAX_ITERATIONS; i++) {
+ /* Change divisor every DIVIDE_ITER iterations. */
+ if (i % DIVIDE_ITER == 0) {
+ divisor_u64 = rte_rand() >> 32;
+ reci_u64 = rte_reciprocal_value_u64(divisor_u64);
+ }
+
+ dividend_u64 = rte_rand();
+
+ start_cyc = rte_rdtsc();
+ nresult_u64 = dividend_u64 / divisor_u64;
+ split_cyc = rte_rdtsc();
+ rresult_u64 = rte_reciprocal_divide_u64(dividend_u64,
+ &reci_u64);
+ end_cyc = rte_rdtsc();
+
+ tot_cyc_n += split_cyc - start_cyc;
+ tot_cyc_r += end_cyc - split_cyc;
+ if (nresult_u64 != rresult_u64) {
+ printf("Division failed, expected %"PRIu64" "
+ "result %"PRIu64"",
+ nresult_u64, rresult_u64);
+ result = 1;
+ break;
+ }
+ }
+ printf("64bit Division results:\n");
+ printf("Total number of cycles normal division : %"PRIu64"\n",
+ tot_cyc_n);
+ printf("Total number of cycles reciprocal division : %"PRIu64"\n",
+ tot_cyc_r);
+ printf("Cycles per division(normal) : %3.2f\n",
+ ((double)tot_cyc_n)/i);
+ printf("Cycles per division(normal) : %3.2f\n",
+ ((double)tot_cyc_r)/i);
+
+ return result;
+}
+
+REGISTER_TEST_COMMAND(reciprocal_division_perf, test_reciprocal_division_perf);
--
2.7.4
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