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Andrew Page
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Fundamental Architecture Question
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Andrew Page
03/25/2009 3:08 PM
post25235
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Fundamental Architecture Question
Starting to lay down the design of a system (single CPU, single application) that will basically have to do the
following:
communicate with "outside" world via radio data link
communicate with "internal" pieces via RS-232
manage messaging, data transformation, etc between the internal pieces & outside world
internal pieces subject to change (new hardware for instance)
One of the problems/issues I am having is that after digging thru the docs for the past 7 - 10 days; I am stiil not
convinced that I understand the relationships between partitions, processes and threads. Seems as if partitions have
processes which in turn have threads (or some combination thereof). For example, I want the external I/O to have its own
time slice (partition) and address space (process) and within it have thread(s) sitting on the input ports and moving
message data to/from another area (partition/process/thread(s)) which does the work.
Does this make sense from a QNX 6.4 standpoint or am I missing something (or maybe a lot of somethings).
Thanks for any light you may be able to shed
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Yuriy Synytskyy
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Re: Fundamental Architecture Question
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Yuriy Synytskyy
03/25/2009 3:27 PM
post25242
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Re: Fundamental Architecture Question
Hello Andrew,
the relationships between processes and threads is well described here
http://www.qnx.com/developers/docs/6.4.0/neutrino/getting_started/about.html
Regards,
Yuriy
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Andrew Page
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RE: Fundamental Architecture Question
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Andrew Page
03/25/2009 3:50 PM
post25247
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RE: Fundamental Architecture Question
Thanks Yuriy, I have indeed read this (more than once actually); what I
did not see in there is how, or even if, processes/threads tie in with
adaptive partitions.
Cheers!
Andy
-----Original Message-----
From: Yuriy Synytskyy [mailto:community-noreply@qnx.com]
Sent: Wednesday, March 25, 2009 12:27 PM
To: momenticsgs-community
Subject: Re: Fundamental Architecture Question
Hello Andrew,
the relationships between processes and threads is well described here
http://www.qnx.com/developers/docs/6.4.0/neutrino/getting_started/about.
html
Regards,
Yuriy
_______________________________________________
QNX Momentics Getting Started
http://community.qnx.com/sf/go/post25242
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Wade Hawkins(deleted)
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RE: Fundamental Architecture Question
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Wade Hawkins(deleted)
03/25/2009 4:28 PM
post25256
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RE: Fundamental Architecture Question
Hi Andrew,
Let me give you an example. I have a target board with 3 partitions on it. One I use for drivers, one I use for a
network file system and one used for qconn. Each partition is setup to only use a specific amount of my CPU resources.
With in each partition I have started one or more processes to take care of a certain function. Each process has
threads with in it to do individual tasks. The Adaptive Partition Scheduler will make sure no process(es) goes over the
alloted CPU resource.
So real world example
My APS breakdown. Three Partitions.
sched_aps NFS 15
sched_aps QCONN 40
sched_aps INETD 10
One of my processes assigned to a partition(network driver).
[sched_aps=IONET] io-pkt-v4 -dsmc9000 ioport=0x04800000,irq=200 -p tcpip
Threads within the process that are ultimately with in the partition
3 1 roc/boot/io-pkt-v4 21r SIGWAITINFO
3 2 roc/boot/io-pkt-v4 10r RECEIVE 1
3 3 roc/boot/io-pkt-v4 22r RECEIVE 14
3 4 roc/boot/io-pkt-v4 21r RECEIVE 15
Time used by the threads will be "billed" to the partition. The scheduler in turn will make sure your Process(and in
turn your threads) do not use more time then you have given them. Of course there is a lot more to Adaptive
Partitioning when it comes to scheduling but this should give you a rough idea of how it works.
-Wade
-----Original Message-----
From: Andrew Page [mailto:community-noreply@qnx.com]
Sent: Wed 3/25/2009 3:50 PM
To: momenticsgs-community
Subject: RE: Fundamental Architecture Question
Thanks Yuriy, I have indeed read this (more than once actually); what I
did not see in there is how, or even if, processes/threads tie in with
adaptive partitions.
Cheers!
Andy
-----Original Message-----
From: Yuriy Synytskyy [mailto:community-noreply@qnx.com]
Sent: Wednesday, March 25, 2009 12:27 PM
To: momenticsgs-community
Subject: Re: Fundamental Architecture Question
Hello Andrew,
the relationships between processes and threads is well described here
http://www.qnx.com/developers/docs/6.4.0/neutrino/getting_started/about.
html
Regards,
Yuriy
_______________________________________________
QNX Momentics Getting Started
http://community.qnx.com/sf/go/post25242
_______________________________________________
QNX Momentics Getting Started
http://community.qnx.com/sf/go/post25247
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Colin Burgess(deleted)
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Re: Fundamental Architecture Question
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Colin Burgess(deleted)
03/25/2009 4:37 PM
post25259
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Re: Fundamental Architecture Question
But don't forget that io-pkt-v4 threads that receive from another thread will inherit the partition of the
client.
Processes don't belong to partitions, threads do, much like only threads have priorities. A process does have
a priority value, but it's simply the original priority we requested that it was launched at - it may not
have any bearing on the real priority of any threads belonging to it.
Colin
Wade Hawkins wrote:
> Hi Andrew,
> Let me give you an example. I have a target board with 3 partitions on
> it. One I use for drivers, one I use for a network file system and one
> used for qconn. Each partition is setup to only use a specific amount
> of my CPU resources. With in each partition I have started one or more
> processes to take care of a certain function. Each process has threads
> with in it to do individual tasks. The Adaptive Partition Scheduler
> will make sure no process(es) goes over the alloted CPU resource.
>
> So real world example
> My APS breakdown. Three Partitions.
> sched_aps NFS 15
> sched_aps QCONN 40
> sched_aps INETD 10
>
> One of my processes assigned to a partition(network driver).
> [sched_aps=IONET] io-pkt-v4 -dsmc9000 ioport=0x04800000,irq=200
> -p tcpip
>
> Threads within the process that are ultimately with in the partition
> 3 1 roc/boot/io-pkt-v4 21r SIGWAITINFO
> 3 2 roc/boot/io-pkt-v4 10r RECEIVE 1
> 3 3 roc/boot/io-pkt-v4 22r RECEIVE 14
> 3 4 roc/boot/io-pkt-v4 21r RECEIVE 15
>
> Time used by the threads will be "billed" to the partition. The
> scheduler in turn will make sure your Process(and in turn your threads)
> do not use more time then you have given them. Of course there is a lot
> more to Adaptive Partitioning when it comes to scheduling but this
> should give you a rough idea of how it works.
>
> -Wade
>
>
> -----Original Message-----
> From: Andrew Page [mailto:community-noreply@qnx.com]
> Sent: Wed 3/25/2009 3:50 PM
> To: momenticsgs-community
> Subject: RE: Fundamental Architecture Question
>
> Thanks Yuriy, I have indeed read this (more than once actually); what I
> did not see in there is how, or even if, processes/threads tie in with
> adaptive partitions.
>
> Cheers!
> Andy
>
> -----Original Message-----
> From: Yuriy Synytskyy [mailto:community-noreply@qnx.com]
> Sent: Wednesday, March 25, 2009 12:27 PM
> To: momenticsgs-community
> Subject: Re: Fundamental Architecture Question
>
> Hello Andrew,
> the relationships between processes and threads is well described here
> http://www.qnx.com/developers/docs/6.4.0/neutrino/getting_started/about.
> html
> Regards,
> Yuriy
>
>
> _______________________________________________
> QNX Momentics Getting Started
> http://community.qnx.com/sf/go/post25242
>
>
> _______________________________________________
> QNX Momentics Getting Started
> http://community.qnx.com/sf/go/post25247
>
>
>
>
> _______________________________________________
> QNX Momentics Getting Started
> http://community.qnx.com/sf/go/post25256
>
--
cburgess@qnx.com
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Andrew Page
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RE: Fundamental Architecture Question
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Andrew Page
03/25/2009 4:59 PM
post25262
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RE: Fundamental Architecture Question
Ah, this was what I was missing; that processes don't belong to
partitions. In my case, then could I have the one application aka
process (we will have a single node, no networking, single CPU) which I
can "distribute" over multiple partitions running multiple threads
within the partitions? However, if I chose I could put a network driver
(say, ethernet) in it own process putting its data into a shared memory
region and then have my app pick it up and do whatever?
Andy
-----Original Message-----
From: Colin Burgess [mailto:community-noreply@qnx.com]
Sent: Wednesday, March 25, 2009 1:38 PM
To: momenticsgs-community
Subject: Re: Fundamental Architecture Question
But don't forget that io-pkt-v4 threads that receive from another thread
will inherit the partition of the client.
Processes don't belong to partitions, threads do, much like only threads
have priorities. A process does have a priority value, but it's simply
the original priority we requested that it was launched at - it may not
have any bearing on the real priority of any threads belonging to it.
Colin
Wade Hawkins wrote:
> Hi Andrew,
> Let me give you an example. I have a target board with 3 partitions
> on it. One I use for drivers, one I use for a network file system and
> one used for qconn. Each partition is setup to only use a specific
> amount of my CPU resources. With in each partition I have started one
> or more processes to take care of a certain function. Each process
> has threads with in it to do individual tasks. The Adaptive Partition
> Scheduler will make sure no process(es) goes over the alloted CPU
resource.
>
> So real world example
> My APS breakdown. Three Partitions.
> sched_aps NFS 15
> sched_aps QCONN 40
> sched_aps INETD 10
>
> One of my processes assigned to a partition(network driver).
> [sched_aps=IONET] io-pkt-v4 -dsmc9000
> ioport=0x04800000,irq=200 -p tcpip
>
> Threads within the process that are ultimately with in the partition
> 3 1 roc/boot/io-pkt-v4 21r SIGWAITINFO
> 3 2 roc/boot/io-pkt-v4 10r RECEIVE 1
> 3 3 roc/boot/io-pkt-v4 22r RECEIVE 14
> 3 4 roc/boot/io-pkt-v4 21r RECEIVE 15
>
> Time used by the threads will be "billed" to the partition. The
> scheduler in turn will make sure your Process(and in turn your
> threads) do not use more time then you have given them. Of course
> there is a lot more to Adaptive Partitioning when it comes to
> scheduling but this should give you a rough idea of how it works.
>
> -Wade
>
>
> -----Original Message-----
> From: Andrew Page [mailto:community-noreply@qnx.com]
> Sent: Wed 3/25/2009 3:50 PM
> To: momenticsgs-community
> Subject: RE: Fundamental Architecture Question
>
> Thanks Yuriy, I have indeed read this (more than once actually); what
> I did not see in there is how, or even if, processes/threads tie in
> with adaptive partitions.
>
> Cheers!
> Andy
>
> -----Original Message-----
> From: Yuriy Synytskyy [mailto:community-noreply@qnx.com]
> Sent: Wednesday, March 25, 2009 12:27 PM
> To: momenticsgs-community
> Subject: Re: Fundamental Architecture Question
>
> Hello Andrew,
> the relationships between processes and threads is well described here
>
http://www.qnx.com/developers/docs/6.4.0/neutrino/getting_started/about.
> html
> Regards,
> Yuriy
>
>
> _______________________________________________
> QNX Momentics Getting Started
> http://community.qnx.com/sf/go/post25242
>
>
> _______________________________________________
> QNX Momentics Getting Started
> http://community.qnx.com/sf/go/post25247
>
>
>
>
>...
View Full Message
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Andrew Page
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RE: Fundamental Architecture Question
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Andrew Page
03/25/2009 4:45 PM
post25260
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RE: Fundamental Architecture Question
Thanks Wade, that clears up the "time" part.
-----Original Message-----
From: Wade Hawkins [mailto:community-noreply@qnx.com]
Sent: Wednesday, March 25, 2009 1:29 PM
To: momenticsgs-community
Subject: RE: Fundamental Architecture Question
Hi Andrew,
Let me give you an example. I have a target board with 3 partitions on
it. One I use for drivers, one I use for a network file system and one
used for qconn. Each partition is setup to only use a specific amount
of my CPU resources. With in each partition I have started one or more
processes to take care of a certain function. Each process has threads
with in it to do individual tasks. The Adaptive Partition Scheduler
will make sure no process(es) goes over the alloted CPU resource.
So real world example
My APS breakdown. Three Partitions.
sched_aps NFS 15
sched_aps QCONN 40
sched_aps INETD 10
One of my processes assigned to a partition(network driver).
[sched_aps=IONET] io-pkt-v4 -dsmc9000 ioport=0x04800000,irq=200
-p tcpip
Threads within the process that are ultimately with in the partition
3 1 roc/boot/io-pkt-v4 21r SIGWAITINFO
3 2 roc/boot/io-pkt-v4 10r RECEIVE 1
3 3 roc/boot/io-pkt-v4 22r RECEIVE 14
3 4 roc/boot/io-pkt-v4 21r RECEIVE 15
Time used by the threads will be "billed" to the partition. The
scheduler in turn will make sure your Process(and in turn your threads)
do not use more time then you have given them. Of course there is a lot
more to Adaptive Partitioning when it comes to scheduling but this
should give you a rough idea of how it works.
-Wade
-----Original Message-----
From: Andrew Page [mailto:community-noreply@qnx.com]
Sent: Wed 3/25/2009 3:50 PM
To: momenticsgs-community
Subject: RE: Fundamental Architecture Question
Thanks Yuriy, I have indeed read this (more than once actually); what I
did not see in there is how, or even if, processes/threads tie in with
adaptive partitions.
Cheers!
Andy
-----Original Message-----
From: Yuriy Synytskyy [mailto:community-noreply@qnx.com]
Sent: Wednesday, March 25, 2009 12:27 PM
To: momenticsgs-community
Subject: Re: Fundamental Architecture Question
Hello Andrew,
the relationships between processes and threads is well described here
http://www.qnx.com/developers/docs/6.4.0/neutrino/getting_started/about.
html
Regards,
Yuriy
_______________________________________________
QNX Momentics Getting Started
http://community.qnx.com/sf/go/post25242
_______________________________________________
QNX Momentics Getting Started
http://community.qnx.com/sf/go/post25247
_______________________________________________
QNX Momentics Getting Started
http://community.qnx.com/sf/go/post25256
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