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From: Leandro Bucci <>
To: Jan Kiszka <>
Cc: xenomai <>
Subject: Re: Execution time
Date: Mon, 8 Mar 2021 11:35:58 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

very interesting thanks

Il lun 8 mar 2021, 11:23 Jan Kiszka <> ha scritto:

> On 03.03.21 15:45, Leandro Bucci via Xenomai wrote:
> > Hi, I noticed a very strange but also interesting fact. When a certain
> > periodic task is executed, if the period is small (for example 0.5ms) I
> > have that the execution times are more or less constant (about 5 micro
> > seconds). If, on the other hand, the period of the same task is larger
> (for
> > example 10ms), the execution times are less predictable and range from 5
> > micro seconds to 15 micro seconds.
> >
> > How is this possible? I am using a raspberry Pi3 and the task is running
> on
> > a core dedicated to xenomai.
> In general, you can see cache "temperature" effects when reducing the
> period of a task: The more frequently it runs, the hotter the cache will
> be and the less likely it is that relevant content for that task has be
> evicted. But all that depends on many factors, the non-rt load, the load
> of the task itself, the caching system etc.
> Jan
> --
> Siemens AG, T RDA IOT
> Corporate Competence Center Embedded Linux

  reply	other threads:[~2021-03-08 10:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-03 14:45 Execution time Leandro Bucci
2021-03-08 10:23 ` Jan Kiszka
2021-03-08 10:35   ` Leandro Bucci [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-02-16 11:34 Leandro Bucci
2021-02-16 14:03 ` Per Oberg
2021-02-16 14:24   ` Leandro Bucci

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