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...rather operations that need to be done > while writing I think. > > For ref I made the above call after writing various chunks to disk in: > https://github.com/pixelb/dvd-vr/blob/master/dvd-vr.c#L322 > and also dd: > http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=5f31155 This does explain why the posix_fadvise call has no effect. How about POSIX_FADV_RANDOM? I would have thought that should be done before the write operations ... > BTW dd has this as an option, and dvd-vr is a specialized tool > often handling large files, so in both these cases FADV_DONT...

--- pxzcat.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/pxzcat.c b/pxzcat.c index 4ab8689..9bcdc36 100644 --- a/pxzcat.c +++ b/pxzcat.c @@ -29,10 +29,11 @@ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ +#define _GNU_SOURCE #include <config.h>

...et a flag like this. These are rather operations that need to be done while writing I think. For ref I made the above call after writing various chunks to disk in: https://github.com/pixelb/dvd-vr/blob/master/dvd-vr.c#L322 and also dd: http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=commit;h=5f31155 BTW dd has this as an option, and dvd-vr is a specialized tool often handling large files, so in both these cases FADV_DONTNEED is appropriate. If pxzcat will always be used for virt images then that does seem appropriate there too, though if used for general files then probably not. cheers, Pádr...