I added code so that the client invokes ionice on itself at startup.
- David
On 9/28/2015 9:50 AM, Eric J Korpela wrote:
FYI, I usually edit the init scripts to start boinc at idle I/O class.
On Mon, Sep 28, 2015 at 9:49 AM, Eric J Korpela <[email protected]
<mailto:[email protected]>> wrote:
linux has had io priorities in the kernel scheduler since 2.6.13 They are
accessed from the command line using the ionice command.
ionice -c <class> -n <piority> <command>
ionice -c <class> -n <priority> -p <pid>
classes are 1 (realtime) 2(standard) 3(idle)
priorities are 0 (highest) to 7 (lowest)
Children inherit the settings of the parent.
In theory the io priorities effect paging, but I'm not sure that counts as a
memory priority. I'm not sure a memory access priority makes sense apart
from
I/O and CPU scheduling since memory access doesn't ususally involve a
system call.
On Mon, Sep 28, 2015 at 9:11 AM, David Anderson <[email protected]
<mailto:[email protected]>> wrote:
Those calls affect CPU priority.
We're looking for something that changes I/O and memory priority.
-- David
On 9/28/2015 7:29 AM, Jon Sonntag wrote:
According to the MSDN documentation regarding SetThreadPriority:
"Sets the priority value for the specified thread. This value,
together with the priority class of the thread's process, determines
the thread's base priority level."
To make sure that GPU apps get access to the CPU when required but
still run in the background, the Collatz apps use the following for
Windows versions:
if
(SetPriorityClass(GetCurrentProcess(),BELOW_NORMAL_PRIORITY_CLASS))
SetThreadPriority(worker_thread_handle,
THREAD_PRIORITY_BELOW_NORMAL);
I believe that boinc_init only allows idle or normal priority.Using
the above allows the GPU apps to run at a higher priority than the
CPU
apps which is especially good when there are 8.5 cores (e.g. 8 CPU
workunits and 1 GPU workunit @ 0.5 CPUs) allocated on an 8 core
host.
Jon Sonntag
On Sun, Sep 27, 2015 at 12:18 AM, David Anderson
<[email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>>
wrote:
Windows has an API for reducing the priority of I/O and memory
usage,
namely SetPriorityClass():
https://msdn.microsoft.com/en-us/library/windows/desktop/ms686219(v=vs.85).aspx
<https://msdn.microsoft.com/en-us/library/windows/desktop/ms686219%28v=vs.85%29.aspx>
<https://msdn.microsoft.com/en-us/library/windows/desktop/ms686219%28v=vs.85%29.aspx>
with the PROCESS_MODE_BACKGROUND_BEGIN**arg.
However - inexplicably - this arg can be used only by a process
on
itself, not
another process.
So we could call this from boinc_init() on Win, but it wouldn't
work with
existing apps.
*
*
On 9/26/2015 2:13 AM, Christian Beer wrote:
The main question here is: Is there a way to prioritize
Memory
and I/O
access? If yes is it available on all platforms (Windows,
Mac,
Linux)? If
not, is there a general way to get the load information from
and schedule
accordingly?
You would still have to distinguish between BOINC generated
Memory and I/O
operations and from other apps. This seems very tricky.
—
Reply to this email directly or view it on GitHub
<https://github.com/BOINC/boinc/issues/1392#issuecomment-143414260>.
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