On Tue, 31 Mar 2015 17:11:33 +0530, Ssagarr Patil said:
> Hi,
> while (loop) {
> /* get the current file size of output file */
> filesize = lseek(outfd, 0, SEEK_END);
>
> /* Increase file size */
> ftruncate(outfd, (off_t)filesize + (off_t)buf.size
Are you sure you want to do these two *every time* through the loop?
> /* mmap destination file */
> if((dest = mmap(0, buf.size, PROT_WRITE, MAP_SHARED, outfd, filesize)) == (void *) -1) {
Similarly here - usually the *entire* file gets mmap'ed.
Also, what did perror() output? (probably nothing, since you stuck a printf
in front of it, which probably reset errno on you).
> memcpy(dest, src, size);
> munmap(dest);
You're not going to achieve faster throughput by adding to the syscall
overhead.
> }
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