On 03-02-16 21:59, Khem Raj wrote:
On Wed, Feb 3, 2016 at 12:57 PM, Phil Blundell <p...@pbcl.net> wrote:
On Wed, 2016-02-03 at 12:51 -0800, Khem Raj wrote:
On Wed, Feb 3, 2016 at 12:48 PM, Phil Blundell <p...@pbcl.net> wrote:
On Tue, 2016-02-02 at 22:17 -0800, Khem Raj wrote:
-pipe does speed up build time so its an optimization.
How much does it really speed it up by? I seem to recall the effect was
fairly negligible, but maybe I am remembering that wrong.
it does not create files for intermediate objects so if you have slow
media it can be significant
but if you have SSDs then it might be diminished.
The files go in /tmp though, right? Even if that isn't a tmpfs, which I
think it is on almost all systems nowadays, they will almost certainly
just sit in the buffer cache and never actually get written to the
disk.
in systems of this age it should be yet.
In the lab, yes.
In the real world, the system may be under load. On desktop computers, /tmp/
is usually NOT on tmpfs.
At some point, in order to "write" to your filesystem, it will need to read it
first (e.g. to get a free allocation spot). In that cause, the read request
will have to get in line behind the other IO requests in the queue, and it
suddenly might take seconds to perform that simple request. Even on SSD, this
will happen and give a noticable drop in performance.
You might want to run that test while reading your disk (dd if=/dev/sda
of=/dev/null) and see what happens.
Kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Products
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