QDS Task Log: Information Memory Message

[Anonymous]

Hello,

Will someone confirm if I have correctly interpreted the memory info. in the QDS task log? Thank you!

Physical FileSize=101.30 Mb.

Definition: the file size of the source .qvw i?

Memory Allocation Delta for this file=516.33 Mb.

Definition: the difference between the physical file size and the amount of memory allocated for the source document in RAM; if you add Physical FileSize and Memory Allocation Delta the result is the amount of RAM the source document uses in memory? (e.g. 617.63 MB)?

Available Physical Memory Before Open=560179.90 Mb.

Definition: of the memory allocated to QVS, this value represents the total amount of memory not in use by QVS prior to document reload into memory?

Available Physical Memory After Open=560377.43 Mb.

Definition: of the total amount of memory allocated to the QVS, this is the amount of memory in use after the document has been reloaded into memory?

Total Physical Memory=1048467.25 Mb.

Definition: total amount of memory allocated to the QVS?

rwunderlich‌

[rwunderlich]

I have not dug down into these numbers but I think your interpretations look generally good. I'd be careful with making assertions about QVS from QDS log messages. You are assuming that any memory not available to QDS is consumed by QVS, which is probably reasonable if both services are on the same box and there are no other significant memory consumers on the box.

Re the Memory Allocation Delta.  I interpret this to be the memory required for the loaded document. I would not add the physical file size.

-Rob

http://masterssummit.com

http://qlikviewcookbook.com

[Anonymous · Accepted solution]

I spoke with an architect from Qlik and he provided me with the correct definitions:

BEFORE RELOAD

Physical FileSize	Size of the qvw
Memory allocation delta for this file	(QVB memory usage after opening the document) - (QVB memory usage before opening the document). The important thing here is that this refers to opening the document but not loading the data into memory.
Available physical memory before open	Available physical memory before opening the document
Available physical memory after open	Available physical memory after opening the document
Total physical memory	Total is the key word

LOG SAMPLE: Physical FileSize=166.22 Mb. Memory Allocation Delta for this file=3.14 Mb. Available Physical Memory Before Open=2940.29 Mb. Available Physical Memory After Open=2935.09 Mb. Total Physical Memory=4095.55 Mb.

• We see 3.14MB recorded as the allocation delta as the data has not been opened and the reload has not run yet.

AFTER RELOAD

Memory allocation delta for this file	(QVB memory usage after reload) - (QVB memory usage before reload)
Available physical memory before reload	Available physical memory before doing the reload
Available physical memory after reload	Available physical memory after doing the reload
Total physical memory	Available physical memory From 12.20 onwards, this is changed to "Available physical memory".

LOG SAMPLE: Memory Allocation Delta for this file=368.16 Mb. Available Physical Memory Before Reload=2935.08 Mb. Available Physical Memory After Reload=2751.88 Mb. Total Physical Memory=2751.88 Mb.

• The memory allocation delta reported here is more in line with what I was expecting. It is higher than the footprint it takes to open the app, but this metric accounts for how much memory it took to complete the reload.