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sptests/spcpucounter01: Add some statistics
This commit is contained in:
Sebastian Huber
@@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
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* Copyright (c) 2014, 2016 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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@@ -29,6 +29,17 @@ const char rtems_test_name[] = "SPCPUCOUNTER 1";
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#define NS_PER_TICK 1000000
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#define N 10
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typedef struct {
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rtems_counter_ticks delay_ns_t[N][2];
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rtems_counter_ticks delay_ticks_t[N][2];
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rtems_counter_ticks overhead_t[N][5];
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rtems_counter_ticks overhead_delta;
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} test_context;
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static test_context test_instance;
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static rtems_interval sync_with_clock_tick(void)
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{
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rtems_interval start = rtems_clock_get_ticks_since_boot();
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@@ -52,56 +63,160 @@ static void test_converter(void)
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rtems_test_assert(ns == 1000000000);
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}
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static void test_delay_nanoseconds(void)
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static void test_delay_nanoseconds(test_context *ctx)
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{
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rtems_counter_ticks start;
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rtems_counter_ticks end;
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rtems_counter_ticks delta;
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double ns_per_tick = NS_PER_TICK;
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uint64_t ns_delta;
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rtems_interval tick;
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int n = 10;
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int i;
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printf("test delay nanoseconds (%i times)\n", n);
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for (i = 0; i < N; ++i) {
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rtems_counter_ticks t0;
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rtems_counter_ticks t1;
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rtems_interval tick;
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for (i = 0; i < n; ++i) {
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tick = sync_with_clock_tick();
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start = rtems_counter_read();
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t0 = rtems_counter_read();
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rtems_counter_delay_nanoseconds(NS_PER_TICK);
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end = rtems_counter_read();
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t1 = rtems_counter_read();
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ctx->delay_ns_t[i][0] = t0;
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ctx->delay_ns_t[i][1] = t1;
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rtems_test_assert(tick < rtems_clock_get_ticks_since_boot());
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}
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}
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delta = rtems_counter_difference(end, start);
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ns_delta = rtems_counter_ticks_to_nanoseconds(delta);
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static void test_delay_ticks(test_context *ctx)
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{
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rtems_counter_ticks ticks = rtems_counter_nanoseconds_to_ticks(NS_PER_TICK);
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int i;
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/* Special case for CPU counters using the clock driver counter */
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if (ns_delta < rtems_configuration_get_nanoseconds_per_tick()) {
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printf(
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"warning: the RTEMS counter seems to be unable to\n"
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" measure intervals greater than the clock tick interval\n"
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);
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for (i = 0; i < N; ++i) {
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rtems_counter_ticks t0;
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rtems_counter_ticks t1;
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rtems_interval tick;
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ns_delta += rtems_configuration_get_nanoseconds_per_tick();
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}
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tick = sync_with_clock_tick();
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t0 = rtems_counter_read();
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rtems_counter_delay_ticks(ticks);
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t1 = rtems_counter_read();
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ctx->delay_ticks_t[i][0] = t0;
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ctx->delay_ticks_t[i][1] = t1;
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rtems_test_assert(tick < rtems_clock_get_ticks_since_boot());
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}
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}
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static void test_overheads(test_context *ctx)
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{
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int i;
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for (i = 0; i < N; ++i) {
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rtems_counter_ticks t0;
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rtems_counter_ticks t1;
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rtems_counter_ticks t2;
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rtems_counter_ticks t3;
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rtems_counter_ticks t4;
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rtems_counter_ticks d;
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t0 = rtems_counter_read();
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t1 = rtems_counter_read();
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d = rtems_counter_difference(t1, t0);
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t2 = rtems_counter_read();
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rtems_counter_delay_nanoseconds(0);
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t3 = rtems_counter_read();
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rtems_counter_delay_ticks(0);
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t4 = rtems_counter_read();
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ctx->overhead_t[i][0] = t0;
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ctx->overhead_t[i][1] = t1;
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ctx->overhead_t[i][2] = t2;
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ctx->overhead_t[i][3] = t3;
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ctx->overhead_t[i][4] = t4;
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ctx->overhead_delta = d;
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}
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}
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static void report_overhead(
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const char *name,
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rtems_counter_ticks t1,
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rtems_counter_ticks t0
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)
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{
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rtems_counter_ticks d;
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uint64_t ns;
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d = rtems_counter_difference(t1, t0);
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ns = rtems_counter_ticks_to_nanoseconds(d);
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printf(
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"overhead %s: %" PRIu64 " ticks, %" PRIu64 "ns\n",
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name,
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(uint64_t) d,
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ns
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);
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}
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static void test_report(test_context *ctx)
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{
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double ns_per_tick = NS_PER_TICK;
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rtems_counter_ticks d;
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uint64_t ns;
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size_t i;
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printf("test delay nanoseconds (%i times)\n", N);
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for (i = 0; i < N; ++i) {
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d = rtems_counter_difference(ctx->delay_ns_t[i][1], ctx->delay_ns_t[i][0]);
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ns = rtems_counter_ticks_to_nanoseconds(d);
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printf(
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"busy wait duration: %" PRIu64 "ns\n"
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"busy wait relative to clock tick: %f\n",
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ns_delta,
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(ns_delta - ns_per_tick) / ns_per_tick
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"ns busy wait duration: %" PRIu64 "ns\n"
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"ns busy wait relative to clock tick: %f\n",
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ns,
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(ns - ns_per_tick) / ns_per_tick
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);
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}
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printf("test delay ticks (%i times)\n", N);
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for (i = 0; i < N; ++i) {
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d = rtems_counter_difference(
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ctx->delay_ticks_t[i][1],
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ctx->delay_ticks_t[i][0]
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);
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ns = rtems_counter_ticks_to_nanoseconds(d);
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printf(
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"ticks busy wait duration: %" PRIu64 "ns\n"
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"ticks busy wait relative to clock tick: %f\n",
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ns,
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(ns - ns_per_tick) / ns_per_tick
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);
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}
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printf("test overheads (%i times)\n", N);
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for (i = 0; i < N; ++i) {
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report_overhead("read", ctx->overhead_t[i][1], ctx->overhead_t[i][0]);
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report_overhead("difference", ctx->overhead_t[i][2], ctx->overhead_t[i][1]);
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report_overhead("delay ns", ctx->overhead_t[i][3], ctx->overhead_t[i][2]);
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report_overhead("delay ticks", ctx->overhead_t[i][4], ctx->overhead_t[i][3]);
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}
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}
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static void Init(rtems_task_argument arg)
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{
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test_context *ctx = &test_instance;
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TEST_BEGIN();
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test_delay_nanoseconds(ctx);
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test_delay_ticks(ctx);
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test_overheads(ctx);
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test_converter();
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test_delay_nanoseconds();
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test_report(ctx);
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TEST_END();
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@@ -8,6 +8,8 @@ directives:
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- rtems_counter_difference()
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- rtems_counter_ticks_to_nanoseconds()
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- rtems_counter_nanoseconds_to_ticks()
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- rtems_counter_delay_nanoseconds()
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- rtems_counter_delay_ticks()
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concepts:
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@@ -1,25 +1,87 @@
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*** TEST SPCPUCOUNTER 1 ***
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CPU counter frequency: 25000000Hz
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*** BEGIN OF TEST SPCPUCOUNTER 1 ***
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CPU counter frequency: 1500000000Hz
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nanoseconds for frequency count ticks: 1000000000
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test delay nanoseconds (10 times)
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busy wait duration: 1000840ns
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busy wait relative to clock tick: 0.000840
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busy wait duration: 1001200ns
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busy wait relative to clock tick: 0.001200
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busy wait duration: 1001480ns
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busy wait relative to clock tick: 0.001480
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busy wait duration: 1001200ns
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busy wait relative to clock tick: 0.001200
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busy wait duration: 1001120ns
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busy wait relative to clock tick: 0.001120
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busy wait duration: 1001280ns
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busy wait relative to clock tick: 0.001280
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busy wait duration: 1001120ns
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busy wait relative to clock tick: 0.001120
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busy wait duration: 1001240ns
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busy wait relative to clock tick: 0.001240
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busy wait duration: 1001120ns
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busy wait relative to clock tick: 0.001120
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busy wait duration: 1001280ns
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busy wait relative to clock tick: 0.001280
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ns busy wait duration: 1000062ns
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ns busy wait relative to clock tick: 0.000062
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ns busy wait duration: 1000017ns
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ns busy wait relative to clock tick: 0.000017
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ns busy wait duration: 1000025ns
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ns busy wait relative to clock tick: 0.000025
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ns busy wait duration: 1000017ns
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ns busy wait relative to clock tick: 0.000017
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ns busy wait duration: 1000043ns
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ns busy wait relative to clock tick: 0.000043
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ns busy wait duration: 1000040ns
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ns busy wait relative to clock tick: 0.000040
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ns busy wait duration: 1000043ns
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ns busy wait relative to clock tick: 0.000043
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ns busy wait duration: 1000022ns
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ns busy wait relative to clock tick: 0.000022
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ns busy wait duration: 1000028ns
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ns busy wait relative to clock tick: 0.000028
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ns busy wait duration: 1000023ns
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ns busy wait relative to clock tick: 0.000023
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test delay ticks (10 times)
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ticks busy wait duration: 1000038ns
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ticks busy wait relative to clock tick: 0.000038
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ticks busy wait duration: 1000028ns
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ticks busy wait relative to clock tick: 0.000028
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ticks busy wait duration: 1000010ns
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ticks busy wait relative to clock tick: 0.000010
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ticks busy wait duration: 1000036ns
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ticks busy wait relative to clock tick: 0.000036
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ticks busy wait duration: 1000031ns
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ticks busy wait relative to clock tick: 0.000031
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ticks busy wait duration: 1000062ns
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ticks busy wait relative to clock tick: 0.000062
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ticks busy wait duration: 1000026ns
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ticks busy wait relative to clock tick: 0.000026
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ticks busy wait duration: 1000031ns
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ticks busy wait relative to clock tick: 0.000031
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ticks busy wait duration: 1000016ns
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ticks busy wait relative to clock tick: 0.000016
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ticks busy wait duration: 1000033ns
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ticks busy wait relative to clock tick: 0.000033
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test overheads (10 times)
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 272 ticks, 181ns
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overhead delay ticks: 20 ticks, 13ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 20 ticks, 13ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 34 ticks, 22ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 34 ticks, 22ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 24 ticks, 16ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 23 ticks, 15ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 23 ticks, 15ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 23 ticks, 15ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 23 ticks, 15ns
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overhead delay ticks: 8 ticks, 5ns
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overhead read: 1 ticks, 0ns
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overhead difference: 1 ticks, 0ns
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overhead delay ns: 23 ticks, 15ns
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overhead delay ticks: 8 ticks, 5ns
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*** END OF TEST SPCPUCOUNTER 1 ***
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