On 07/22/2020 01:22 PM, David Carsenat wrote:
Ok thanks. The code is really simple and i don't think it can be
optimized.
Is there other linux OS i can try ?
Thanks again.
If it's really simple, what is the sample-rate? Is it trying to write
data to the filesystem at high rates? No amount of code optimization
can get
around the fact that the disk subsystem is very slow compared to
other parts of the computer, like memory, CPU, etc.
Le mer. 22 juil. 2020 à 19:12, Marcus D. Leech via USRP-users
<usrp-users@lists.ettus.com <mailto:usrp-users@lists.ettus.com>> a écrit :
On 07/22/2020 12:56 PM, David Carsenat via USRP-users wrote:
> Hello, I have made a c++ code which sends samples in the main
function
> and receives samples in a thread launched in this main function.
> I have read that we can set the real time priority with the
> set_thread_priority function.
> I have tried to call this function (with parameters (1,true) inside
> the main function but it doesn't seem to change the priority of the
> executable. When I launch another application, I have lots of U
and O.
>
> Do you have an idea how to achieve what I want ? i.e. allocate
almost
> all computer resources to my uhd program ? What is the best way ?
> I have already tuned my ubuntu with advice given on Ettus site.(
> cpu-freq set etc...)
>
> Many thanks
>
> David
>
In general, applications have only very-rough control over the
behavior
of the scheduler. This is true in most general-purpose operating
system
environments, whether it's Windows, Linux, *BSD, MacOS, etc.
If you've played with priorities, and starting up other programs
causes
OU to happen, you should probably consider:
(A) Optimizing your code -- find out where the hot-spots are, and
see if
they can be improved
(B) Choosing a faster CPU
The CPU usage of a DSP flow is roughly proportional to:
inherent-per-sample-complexity X sample-rate
Can you lower the sample rate and still achieve what you need to
achieve? Can you improve the main-path per-sample complexity?
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