顺序读/写速度 [英] sequential read/write speeds

问题描述

How can i measure sequential read/write speeds?
is there any API, library that can help me?

推荐答案

在大多数POSIX系统上，你可以使用时钟。

On most POSIX systems, you can use clock.

#include <time.h>

clock_t start = clock();
do_some_work();
clock_t elapsed = clock() - start;

在具有内联汇编的x86系统上，您可以使用RDSTC。 />

On x86 systems with inline assembly, you can use RDSTC.

long long __declspec(naked) tick()
{
    rdtsc;
}

long long start = tick();
do_some_work();
long long elapsed = tick() - start;

另一个POSIX API是clock_gettime。

Another POSIX API is clock_gettime.

#include <unistd.h>
struct timeval start, elapsed;

clock_gettime(CLOCK_MONOTONIC, &start);
do_some_work();
clock_gettime(CLOCK_MONOTONIC, &elapsed);

if (start.tv_usec > elapsed.tv_usec)
elapsed.tv_sec--;
elapsed.tv_usec -= start.tv_usec;
elapsed.tv_sec -= start.tv_sec;

// elapsed contains elapsed time in seconds (tv_sec) and microseconds (tv_usec).
</unistd.h>

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