Disable file system cache during imwrite [closed]

edit

Is this really an OpenCV issue? What do you mean by system buff/cache? Memory? Can you post a minimal example of your code?

If the system has a cache, the problem is that your hard drive becomes the bottleneck aften the cache fills up. Obviously, you can find a library or source code to write any format you like, but it is unlikely to bring any speed benefit - especially with BMP, which is the very worst in that regard. Perhaps you could write JPEGs and in a separate process convert them to BMPs.

seems to be a limitation of your os (and has to be handled from there)

i'm quite sure you can reproduce it with just writing 800 images to disk (w/o using imwrite)

Code snippet:

int count = 0;
unsigned char * buff = NULL;
cv::Mat matt(800, 1280, CV_8UC4);
cv::Mat mat;
while(count < 10000) {
    buff = captureFrame(); // Using V4L2 to capture frame
    memcpy(matt.data, buff, 1280*800*4);
    cv::cvtColor(matt, mat, cv::COLOR_BGRA2BGR);
    sprintf(file_name, "./camera_images_data/frame%d.bmp", count);
    cv::imwrite(file_name, mat);
    count++;
}

This is the code snippet I am using

@Der Luftmensch, As per Requirement I need to use either png or bmp.