Am 01.04.2015 um 06:53 schrieb Dave Johansen:
I added the call to mlockall() (it did have to be run as root) on a F21
machine with no swap and the slow down was still visible in the CPU
bound task
surely, as expected
On 31 March 2015 at 22:53, Dave Johansen davejohan...@gmail.com wrote:
On Tue, Mar 31, 2015 at 3:26 PM, Richard W.M. Jones rjo...@redhat.com
wrote:
On Tue, Mar 31, 2015 at 12:21:55PM -0700, Dave Johansen wrote:
You're right that is a problem because my purely CPU bound task was
actually
On Wed, Apr 1, 2015 at 1:32 AM, Reindl Harald h.rei...@thelounge.net
wrote:
Am 01.04.2015 um 06:53 schrieb Dave Johansen:
I added the call to mlockall() (it did have to be run as root) on a F21
machine with no swap and the slow down was still visible in the CPU
bound task
surely, as
Am 01.04.2015 um 19:36 schrieb Dave Johansen:
On Wed, Apr 1, 2015 at 1:32 AM, Reindl Harald wrote:
Am 01.04.2015 um 06:53 schrieb Dave Johansen:
I added the call to mlockall() (it did have to be run as root)
on a F21
machine with no swap and the slow down was
On Wed, Apr 1, 2015 at 10:39 AM, Reindl Harald h.rei...@thelounge.net
wrote:
Am 01.04.2015 um 19:36 schrieb Dave Johansen:
On Wed, Apr 1, 2015 at 1:32 AM, Reindl Harald wrote:
Am 01.04.2015 um 06:53 schrieb Dave Johansen:
I added the call to mlockall() (it did have to be run
On Wed, Apr 1, 2015 at 8:18 AM, Stephen John Smoogen smo...@gmail.com
wrote:
On 31 March 2015 at 22:53, Dave Johansen davejohan...@gmail.com wrote:
On Tue, Mar 31, 2015 at 3:26 PM, Richard W.M. Jones rjo...@redhat.com
wrote:
On Tue, Mar 31, 2015 at 12:21:55PM -0700, Dave Johansen wrote:
On Tue, Mar 31, 2015 at 3:26 PM, Richard W.M. Jones rjo...@redhat.com
wrote:
On Tue, Mar 31, 2015 at 12:21:55PM -0700, Dave Johansen wrote:
You're right that is a problem because my purely CPU bound task was
actually writing to disk every 10 seconds, so I've attached an updated
version
On Mon, Mar 30, 2015 at 10:02 PM, Nico Kadel-Garcia nka...@gmail.com
wrote:
On Mon, Mar 30, 2015 at 3:58 PM, Dave Johansen davejohan...@gmail.com
wrote:
I noticed on RHEL 6 that when a large amount of disk I/O is happening
that
CPU bound tasks slow down. I have been able to reproduce it in
On Tue, Mar 31, 2015 at 10:44 AM, Richard W.M. Jones rjo...@redhat.com
wrote:
On Tue, Mar 31, 2015 at 08:32:16AM -0700, Dave Johansen wrote:
I am not familiar with the low level details of disk I/O but I'm sure
that
they are far more complicated than my basic assumptions, but my concern
is
On Tue, Mar 31, 2015 at 08:32:16AM -0700, Dave Johansen wrote:
I am not familiar with the low level details of disk I/O but I'm sure that
they are far more complicated than my basic assumptions, but my concern is
how can a disk-bound process steal cycles from a CPU-bound one that is not
access
On Tue, Mar 31, 2015 at 12:21:55PM -0700, Dave Johansen wrote:
You're right that is a problem because my purely CPU bound task was
actually writing to disk every 10 seconds, so I've attached an updated
version that pre-allocates a vector and stores the results there so they
can be dumped when
I noticed on RHEL 6 that when a large amount of disk I/O is happening that
CPU bound tasks slow down. I have been able to reproduce it in Fedora 21
as well and here are the instructions of how I can reproduce it with a
simple test:
1) Build the disk_test.cc (the CPU bound task) and run it.
2)
On Mon, Mar 30, 2015 at 12:58 PM, Dave Johansen davejohan...@gmail.com wrote:
I noticed on RHEL 6 that when a large amount of disk I/O is happening that
CPU bound tasks slow down. I have been able to reproduce it in Fedora 21
as well and here are the instructions of how I can reproduce it with
On Mon, Mar 30, 2015 at 9:58 PM, Dave Johansen davejohan...@gmail.com wrote:
I noticed on RHEL 6 that when a large amount of disk I/O is happening that
CPU bound tasks slow down. I have been able to reproduce it in Fedora 21
as well and here are the instructions of how I can reproduce it with a
On Mon, Mar 30, 2015 at 2:43 PM, drago01 drag...@gmail.com wrote:
https://lwn.net/Articles/572911/
https://lwn.net/Articles/467328/
Yeah, I vaguely remember that discussion. I went down this rabbit hole
in mid-2008, wrote a couple of papers and moved on with my life.
There's no software
On Mon, Mar 30, 2015 at 3:15 PM, M. Edward (Ed) Borasky zn...@znmeb.net
wrote:
On Mon, Mar 30, 2015 at 2:43 PM, drago01 drag...@gmail.com wrote:
https://lwn.net/Articles/572911/
https://lwn.net/Articles/467328/
Thanks for the info. That's very helpful, but it looks like that discussion
On Mon, Mar 30, 2015 at 3:58 PM, Dave Johansen davejohan...@gmail.com wrote:
I noticed on RHEL 6 that when a large amount of disk I/O is happening that
CPU bound tasks slow down. I have been able to reproduce it in Fedora 21
as well and here are the instructions of how I can reproduce it with a
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