Re: pmlogger -u questions

[Nathan Scott <nathans@xxxxxxxxxx>]

----- Original Message -----
> Hi -
> 
> On Mon, Apr 14, 2014 at 07:42:57PM -0400, Nathan Scott wrote:
> > [...]
> > I concur with Frank here - definitely warrants some deep cost analysis -
> > it sounds risky WRT introducing performance regression.
> 
> I wouldn't over-worry about it.  The PMCD PDU's are already being
> relayed to volume files in one chunk, so that's great.  Getting the
> trailer bytes in there would be dandy.  Beyond that, we'd be actually
> saving some effort in that we'd eliminate one copy (by not going into
> stdio buffers).
> 
> > What is the I/O size we generally submit from pmlogger data writes,
> > OOC?  [...]
> 
> Ken reported seeing alternating 4/8K write(2) syscalls coming, which
> makes sense for 12K-ish log record batches going into stdio.

Awesome, thanks guys - you had me at hello^W"I wouldn't over-worry".  ;)

cheers.

--
Nathan