I'm writing a benchmark tool in C++ where I want to clear the filesystem memory cache between experiments. I'm aware of the following console commands:
sync
echo 3 > /proc/sys/vm/drop_caches
My question is how can i do this programmatically directly within C++?
Any help is appreciated!
A slightly better way is to sync just the file systems which contains your descriptors using syncfs(). Or even better, simply use fsync().
int fd = open(...); // Open your files
write(...); // Your write calls
fsync(fd); // Sync your file
close(fd); // Close them
fsync() can fail if your descriptor is invalid. Look for errno if it returns -1.