800xA 5.1: AC800m: Heap Utilization and "Non-used heap"

See the attached screenshots from the "Heap Utilization" dialog for a PM865 controller and the "Memory Organization" table from the docs.

The Memory Organization table from the docs doesn't makes sense when compared to the Heap Utilization screenshot.

Looks like "Non-used heap" from the Heap Utilization dialog is really what's referred to as "Spare" in the docs?

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rewinixux Rank: 1189

Asked 8 months ago

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After discussion with concern team, I have following information:-

Modified Memory Organization chart:

è Project = Empty Project + Application(s)

è Executing firmware is the firmware you download before you download the application.

The size of the firmware can be found here (without protocol Handlers):

è Used by firmware is the Memory Consumptions of the protocols and CEX Units:

For example: if you use Comli with CI853 for PM866, then this consumes 72+2 Kbytes and adds to ‘Used by firmware’,

And if you add two CI854B for PM866, then this consumes 247 + 33 Kbytes and adds to ‘Used by firmware’.

Heap Utilization Diag:

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AftabMemon Rank: 34

Answered 8 months ago

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Yes, actually from the manual, 'Non-used heap' is not just the Spare memory, but the total of IEC 61131-3 application memory and Spare memory.

But the white space in the Heap Utilization dialog shows the Spare memory, and not the application memory. This is confusing. :D

You should be able to find out the memory used by the application by subtracting Used Shared Heap and Max Used Shared Heap.

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by Vinoth Sankar Rank: 112 on 9/9/2018 10:49:12 PM | Like (1) | Report

i think if you subtract used share heap and max used shared heap will not provide Application memory. Since Application memory will be allocated in Non-used Heap.

by rewinixux Rank: 1189 on 9/10/2018 2:46:26 AM | Like (2) | Report

Vinoth, look at the Memory Organization table from the docs that I attached. Judging by that, you should get the Application Memory by subtracting Used Shared Heap from the Max Used Shared Heap. If you can't, that table is misleading.

by Vinoth Sankar Rank: 112 on 9/10/2018 2:57:25 AM | Like (1) | Report

Agreed but i just think in other way that max used shared heap shall use Application memory during online changes. But I hope that the actual conception from memory organisation explained below is inline

by AftabMemon Rank: 34 on 9/10/2018 4:31:22 AM | Like (1) | Report

Hi Rewinixux, I found out that the document you are referring to is SV 5.1 system guide. Isn't it? This manual has the text 'Application Memory'.
If you refer any 800xA configuration manual (3BSE035980*), you will not find this text 'Application Memory' mentioned in the figure. Strange.

And I will get back to you on the white part shown in the Heap Utilization diag. If it is only Spare, then we are correct; if it is Spare + Application, document needs to be more precise in explaining the same.
But as per the current Document figure and Heap Utilization diag, both are not matching.

by rewinixux Rank: 1189 on 9/10/2018 5:53:54 AM | Like (1) | Report

The documentation is 3BSE041434-510_H_en_System_800xA_5.1_System_Guide_Technical_Data_and_Configuration.pdf page 106

and

3BSE035980-511_en_System_800xA_Control_5.1_AC_800M_Configuration.pdf page 451

My understanding is that "Non-used heap" equals "Spare" when you're not downloading. In other words, "Max used Shared Heap" plus "Non-used Heap" will equal 100% when not downloading. But when you're downloading, an unknown amount of the "Non-used heap" will be used. No?

by AftabMemon Rank: 34 on 9/11/2018 4:55:25 AM | Like (0) | Report

If you see document: 3BSE035980-511, you will not see the 'Application Memory', like in the 3BSE041434-510 system guide manual. But still things are not clear in any manual.

I am currently testing the exact meaning of Non-used heap and shared heap, and will get back with detailed result.

But I came to know 1 thing, the white part in the Heap Utilization Diag is the Spare memory, and not Spare + Application memory.
For referring to the memory used by Application(s), you can go to CBM -> Tools -> Compiler Statistics -> Select application and then select Update. You will see the memory of Application (s) in Bytes.

by AftabMemon Rank: 34 on 9/13/2018 7:11:53 AM | Like (0) | Report

Sorry for the delay, but I have the answers. Please refer below for my new answer.

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AftabMemon Rank: 34

Answered 8 months ago

Information provided in Heap utilization dialog and Memory organisation are same. You shall interpretate in the below manner

As per document,
Total Memory = Used shared Heap( Empty Project+ Firmware used ) + Non-used Heap ( Spare + Application Memory) + Executing Firmware

the confusing part is the Max used Shared Heap. Actually it is the figure which shall provide information that how far the used shared heap memory can raise while doing online changes

As per your attachment
Heap utilization windows shows that used shared heap is 11.03 which shall be maximum used upto 15.04
Total Non used heap memory is 79.56 which included spare and application memory.

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Vinoth Sankar Rank: 112

Answered 8 months ago

100% includes Max.Used shared heap(its includes Used shared heap) + Non used heap + Executing firmware. Refer the memory organisation pics,
total RAM includes executing firmware along with both heaps
For example, refer below pics

In the above pics,32MB RAM
Firmware = 7.746
Max.used Shared Heap = 3.009
Non used heap = 21.245
Total=32MB that is Firmware execution + Max used Shared heap + Non used heap( Spare + Application) comprises your total RAM
I hope you will agree with it.

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Vinoth Sankar Rank: 112

Answered 8 months ago

Ok so I spoke with someone from ABB Malmö. The answer to this question is yes, the "Non-used heap" from the Heap Utilization dialog is referred to as "Spare" in the Memory Organization table in the docs.

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rewinixux Rank: 1189

Answered 8 months ago

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800xA 5.1: AC800m: Heap Utilization and "Non-used heap"

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