[英]How to programmatically clear the filesystem memory cache in C++ on a Linux system?
I'm writing a benchmark tool in C++ where I want to clear the filesystem memory cache between experiments. 我正在用C ++编写一个基准测试工具,我希望在实验之间清除文件系统内存缓存。 I'm aware of the following console commands: 我知道以下控制台命令:
sync
echo 3 > /proc/sys/vm/drop_caches
My question is how can i do this programmatically directly within C++? 我的问题是如何在C ++中直接以编程方式执行此操作?
Any help is appreciated! 任何帮助表示赞赏!
Something like this should do the trick: 像这样的东西应该做的伎俩:
int fd;
char* data = "3";
sync();
fd = open("/proc/sys/vm/drop_caches", O_WRONLY);
write(fd, data, sizeof(char));
close(fd);
Just write to it : 写信给它:
sync();
std::ofstream ofs("/proc/sys/vm/drop_caches");
ofs << "3" << std::endl;
A slightly better way is to sync just the file systems which contains your descriptors using syncfs()
. 稍微好一点的方法是使用syncfs()
同步包含描述符的文件系统。 Or even better, simply use fsync()
. 或者甚至更好,只需使用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. 如果描述符无效, fsync()
可能会失败。 Look for errno
if it returns -1
. 如果它返回-1
则查找errno
。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.