RE: db_file_multiblock_read_count causing full scans to takelonger?
- From: Kevin Lidh <kevin.lidh@xxxxxxxxx>
- To: kevinc@xxxxxxxxxxxxx
- Date: Tue, 19 Dec 2006 14:22:10 -0700
In my case, it's filesystem. Is there a parameter that determines
read-aheads? I'll look for HP-UX but if you know of a Linux or other OS
parameter, it would make it easier for me to frame the question. As a
result of this discussion I re-ran the "time dd" tests and found that
the elbow is right before "bs=256k". Even "bs=255k" is faster (and as
fast as 128, 32, anything less than 256).
On Tue, 2006-12-19 at 13:03 -0800, Kevin Closson wrote:
> Is this direct I/O or a filesystem? Could the filesystem
> be firing off some uneccessary read-aheads when you do large
> dfmbrc but not when you are nibbling with smaller multiblock request?
>
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