On Wed, 21 Apr 2004, Steve Watt wrote:
> In article <[EMAIL PROTECTED]> you write: > > > >Ok so I have an application where I need to > >reread a file I have just written to ensure that it went to disk > >correctly.. > > > >Other than reading a few GB of data, is there a way to flush > >out the cache copy of a file I've written? > > You can flush the file to disk with fsync(). But I don't think that > evicts the blocks from the cache, just forces them to be written. To > the disk controller's cache, if you're lucky. > > >possibilities include: > > > >a file flag saying "don't keep a copy after it's written to disk"? > >a syscall discard_cached_blocks(fd); > > > > > >? > >any other suggestions? > > What are you hoping to accomplish? There are probably other ways > to solve the larger problem. I thought I was being clear.. I need to remove all the pages from cache so that a reread of the file is forced to go to disk. and I don't want to go read a 2GB dummy file to force the flush.. Someone suggested that I read the file usign 'dump' through the raw device.. > > -- > Steve Watt KD6GGD PP-ASEL-IA ICBM: 121W 56' 57.8" / 37N 20' 14.9" > Internet: steve @ Watt.COM Whois: SW32 > Free time? There's no such thing. It just comes in varying prices... > _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
