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https://github.com/alsa-project/alsa-lib.git
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Enhanced measuring
This commit is contained in:
Jaroslav Kysela
parent
16f785ca13
commit
db59805cdd
1 changed files with 152 additions and 43 deletions
195
test/code.c
195
test/code.c
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@ -1,6 +1,9 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <sched.h>
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#include <sys/time.h>
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#define rdtscll(val) \
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__asm__ __volatile__("rdtsc" : "=A" (val))
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@ -11,7 +14,9 @@
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typedef short int s16;
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typedef int s32;
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#if 0
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#define CONFIG_SMP
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#endif
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#ifdef CONFIG_SMP
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#define LOCK_PREFIX "lock ; "
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@ -61,6 +66,25 @@ static inline void atomic_add(volatile int *dst, int v)
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:"ir" (v));
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}
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static double detect_cpu_clock()
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{
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struct timeval tm_begin, tm_end;
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unsigned long long tsc_begin, tsc_end;
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/* Warm cache */
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gettimeofday(&tm_begin, 0);
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rdtscll(tsc_begin);
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gettimeofday(&tm_begin, 0);
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usleep(1000000);
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rdtscll(tsc_end);
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gettimeofday(&tm_end, 0);
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return (tsc_end - tsc_begin) / (tm_end.tv_sec - tm_begin.tv_sec + (tm_end.tv_usec - tm_begin.tv_usec) / 1e6);
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}
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void mix_areas0(unsigned int size,
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volatile s16 *dst, s16 *src,
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volatile s32 *sum,
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@ -70,12 +94,15 @@ void mix_areas0(unsigned int size,
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{
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while (size-- > 0) {
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s32 sample = *dst + *src;
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if (unlikely(sample & 0xffff0000))
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*dst = sample > 0 ? 0x7fff : -0x8000;
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if (unlikely(sample < -0x8000))
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*dst = -0x8000;
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else if (unlikely(sample > 0x7fff))
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*dst = 0x7fff;
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else
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*dst = sample;
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((char *)dst) += dst_step;
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((char *)src) += src_step;
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((char *)sum) += sum_step;
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}
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}
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@ -109,6 +136,8 @@ void mix_areas1(unsigned int size,
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"\tcmp $0, %%edx\n"
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"jz 6f\n"
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"\t.p2align 4,,15\n"
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"1:"
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/*
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@ -119,12 +148,12 @@ void mix_areas1(unsigned int size,
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*/
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"\tmovw $0, %%ax\n"
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"\tmovw $1, %%cx\n"
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"\tlock; cmpxchgw %%cx, (%%edi)\n"
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"\t" LOCK_PREFIX "cmpxchgw %%cx, (%%edi)\n"
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"\tmovswl (%%esi), %%ecx\n"
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"\tjnz 2f\n"
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"\tsubl (%%ebx), %%ecx\n"
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"2:"
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"\tlock; addl %%ecx, (%%ebx)\n"
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"\t" LOCK_PREFIX "addl %%ecx, (%%ebx)\n"
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/*
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* do {
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@ -158,9 +187,10 @@ void mix_areas1(unsigned int size,
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* sample > 0x7fff
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*/
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"\t.p2align 4,,15\n"
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"4:"
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"\tmovw $0x7fff, %%ax\n"
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"\tmovw %%ax, (%%edi)\n"
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"\tmovw $0x7fff, (%%edi)\n"
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"\tcmpl %%ecx,(%%ebx)\n"
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"\tjnz 3b\n"
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"\tadd %4, %%edi\n"
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@ -174,9 +204,10 @@ void mix_areas1(unsigned int size,
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* sample < -0x8000
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*/
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"\t.p2align 4,,15\n"
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"5:"
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"\tmovw $-0x8000, %%ax\n"
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"\tmovw %%ax, (%%edi)\n"
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"\tmovw $-0x8000, (%%edi)\n"
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"\tcmpl %%ecx, (%%ebx)\n"
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"\tjnz 3b\n"
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"\tadd %4, %%edi\n"
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@ -223,7 +254,9 @@ void mix_areas1_mmx(unsigned int size,
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* while (size-- > 0) {
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*/
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"\tcmp $0, %%edx\n"
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"jz 6f\n"
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"\tjz 6f\n"
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"\t.p2align 4,,15\n"
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"1:"
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@ -235,12 +268,12 @@ void mix_areas1_mmx(unsigned int size,
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*/
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"\tmovw $0, %%ax\n"
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"\tmovw $1, %%cx\n"
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"\tlock; cmpxchgw %%cx, (%%edi)\n"
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"\t" LOCK_PREFIX "cmpxchgw %%cx, (%%edi)\n"
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"\tmovswl (%%esi), %%ecx\n"
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"\tjnz 2f\n"
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"\tsubl (%%ebx), %%ecx\n"
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"2:"
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"\tlock; addl %%ecx, (%%ebx)\n"
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"\t" LOCK_PREFIX "addl %%ecx, (%%ebx)\n"
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/*
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* do {
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@ -281,11 +314,10 @@ void mix_areas1_mmx(unsigned int size,
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void mix_areas2(unsigned int size,
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volatile s16 *dst, s16 *src,
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volatile s16 *dst, const s16 *src,
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volatile s32 *sum,
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unsigned int dst_step,
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unsigned int src_step,
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unsigned int sum_step)
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unsigned int src_step)
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{
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while (size-- > 0) {
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s32 sample = *src;
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@ -294,25 +326,66 @@ void mix_areas2(unsigned int size,
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atomic_add(sum, sample);
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do {
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sample = *sum;
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s16 s;
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if (unlikely(sample & 0x7fff0000))
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s = sample > 0 ? 0x7fff : -0x8000;
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if (unlikely(sample < -0x8000))
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*dst = -0x8000;
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else if (unlikely(sample > 0x7fff))
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*dst = 0x7fff;
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else
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s = sample;
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*dst = s;
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*dst = sample;
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} while (unlikely(sample != *sum));
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((char *)sum) += sum_step;
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sum++;
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((char *)dst) += dst_step;
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((char *)src) += src_step;
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}
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}
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void setscheduler(void)
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{
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struct sched_param sched_param;
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if (sched_getparam(0, &sched_param) < 0) {
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printf("Scheduler getparam failed...\n");
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return;
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}
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sched_param.sched_priority = sched_get_priority_max(SCHED_RR);
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if (!sched_setscheduler(0, SCHED_RR, &sched_param)) {
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printf("Scheduler set to Round Robin with priority %i...\n", sched_param.sched_priority);
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fflush(stdout);
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return;
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}
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printf("!!!Scheduler set to Round Robin with priority %i FAILED!!!\n", sched_param.sched_priority);
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}
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#define CACHE_SIZE (1024*1024)
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void init(s16 *dst, s32 *sum, int size)
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{
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int count;
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char *a;
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for (count = size - 1; count >= 0; count--)
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*sum++ = 0;
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for (count = size - 1; count >= 0; count--)
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*dst++ = 0;
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a = malloc(CACHE_SIZE);
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for (count = CACHE_SIZE - 1; count >= 0; count--) {
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a[count] = count & 0xff;
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a[count] ^= 0x55;
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a[count] ^= 0xaa;
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}
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free(a);
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}
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int main(int argc, char **argv)
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{
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int size = 2048, n = 4, max = 0x7fff;
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int i;
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unsigned long long begin, end;
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int size = 2048, n = 4, max = 32267;
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int LOOP = 30;
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int i, t;
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unsigned long long begin, end, diff, diff0, diff1, diff1_mmx, diff2;
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double cpu_clock = detect_cpu_clock();
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setscheduler();
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printf("CPU clock: %fMhz\n\n", cpu_clock / 10e5);
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if (argc == 4) {
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size = atoi(argv[1]);
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n = atoi(argv[2]);
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@ -329,29 +402,65 @@ int main(int argc, char **argv)
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*s = (rand() % (max * 2)) - max;
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}
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}
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas0(size, dst, srcs[i], sum, 2, 2, 4);
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for (t = 0, diff0 = -1; t < LOOP; t++) {
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init(dst, sum, size);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas0(size, dst, srcs[i], sum, 2, 2, 4);
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}
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rdtscll(end);
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diff = end - begin;
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if (diff < diff0)
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diff0 = diff;
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printf("mix_areas0 : %lld \r", diff); fflush(stdout);
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}
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rdtscll(end);
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printf("mix_areas0 : %lld\n", end - begin);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas1(size, dst, srcs[i], sum, 2, 2, 4);
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for (t = 0, diff1 = -1; t < LOOP; t++) {
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init(dst, sum, size);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas1(size, dst, srcs[i], sum, 2, 2, 4);
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}
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rdtscll(end);
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diff = end - begin;
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if (diff < diff1)
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diff1 = diff;
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printf("mix_areas1 : %lld \r", diff); fflush(stdout);
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}
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rdtscll(end);
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printf("mix_areas1 : %lld\n", end - begin);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas1_mmx(size, dst, srcs[i], sum, 2, 2, 4);
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for (t = 0, diff1_mmx = -1; t < LOOP; t++) {
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init(dst, sum, size);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas1_mmx(size, dst, srcs[i], sum, 2, 2, 4);
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}
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rdtscll(end);
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diff = end - begin;
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if (diff < diff1_mmx)
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diff1_mmx = diff;
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printf("mix_areas1_mmx: %lld \r", diff); fflush(stdout);
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}
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rdtscll(end);
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printf("mix_areas1_mmx: %lld\n", end - begin);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas2(size, dst, srcs[i], sum, 2, 2, 4);
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for (t = 0, diff2 = -1; t < LOOP; t++) {
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init(dst, sum, size);
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rdtscll(begin);
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for (i = 0; i < n; i++) {
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mix_areas2(size, dst, srcs[i], sum, 2, 2);
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}
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rdtscll(end);
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diff = end - begin;
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if (diff < diff2)
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diff2 = diff;
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printf("mix_areas2 : %lld \r", diff); fflush(stdout);
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}
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rdtscll(end);
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printf("mix_areas2 : %lld\n", end - begin);
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printf(" \r");
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printf("Summary (the best times):\n");
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printf("mix_areas0 : %lld\n", diff0);
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printf("mix_areas1 : %lld\n", diff1);
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printf("mix_areas1_mmx: %lld\n", diff1_mmx);
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printf("mix_areas2 : %lld\n", diff2);
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return 0;
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}
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