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IDS Forum

Re: identify what is allocating memory

Posted By: Cesar Martins
Date: Friday, 28 July 2017, at 3:22 p.m.

In Response To: Re: identify what is allocating memory (JACQUES RENAUT)

@Marcus ,
The reason to try identify who is using determined segment is because the
engine just start allocate segments and do not stop.
Itried identify who needed all this memory.
I check the defect that you mentioned and I suspect could be it , because
the mt pool was ~2GB of total size.
(this do not match with +9GB segments allocated , but since we are talking
about a defect, always consider everything is possible here)

So, we already delayed our upgrade from FC8W1 to FC9 few days ago.
With this situation , we should probably need to bounce our instance soon
or it would run out of memory, so I've stopped it and upgrade to FC9 .

@Jacques ,

Thank you for your explanation.
Please, can you answer my question below?

If I get the sum of the column totalsize of all lines on 'onstat -g mem'
(Pool+blkpool), should be close value of the used memory for the segments
at 'onstat -g seg' ? (respecting the type of the segment, vitual,
reserved...)
Ask that because the situation I had here the sum of everything at 'onstat
-g mem' was close of 8.3GB and the used segments at 'onstat -g seg' was
~16G (blkused*4096).
Which is to huge discrepancy...

I open an PMR for this, but unfortunately we do not have time enough to
wait a feedback to collect more information and decide bounce and upgrade
the instance since we was into a window for maintanece where this will be
allowed.

Regards
Cesar

2017-07-28 12:09 GMT-03:00 JACQUES RENAUT <jacques.renaut@hcl.com>:

> original post:
>
> <stuff removed>
>
> onstat -g afr in includes the column "addr (hexadecimal) Memory address of
> the
> pool fragment".
>
> Does the memory address of the pool fragment tell you which virtual segment
> contains the fragment?
>
> Regards,
> David.
>
> Response:
>
> Yes it does. If you look at onstat -g seg output, it includes the "addr"
> and
> "size" columns. The addr + size columns gives you the range of addresses
> that
> would be in any particular segment. So once you have the start and end
> address
> range, when you look at the 1st column in onstat -g afr (which is the addr
> column). If the address of that line in the onstat -g afr output is
> contained
> in the address range of the addr+size of the onstat -g seg output, then
> that
> block of memory from the afr output would be in that particular segment.
>
> So from a tiny instance I have up currently I have this in my onstat -g seg
> (it's only got 1 virtual segment but just for illustration)
>
> Segment Summary:
> id key addr size ovhd class blkused blkfree
> 73531403 525f4801 44000000 911104 495784 R 1199 0
> 73564177 525f4802 444af000 135839744 1593528 V 10462 22702
> 73596946 525f4803 4c63b000 113287168 1 B 27658 0
>
> So my 1 virtual segment range would be from 0x444af000 - 0x4c63b000 (which
> you
> can see it is contiguous with the following Buffer pool segment that
> starts at
> 0x4c63b000...this is normally what you would see, but on some platforms
> there
> can be gaps between the segments reported in onstat -g seg).
>
> So then from an onstat -g afr on a random pool we have
>
> Allocations for pool name rascron:
> addr size memid fileid location
> 46635000 3328 overhead 301 mtshpool.c:606
> 46635d00 232 TRACE 16 ph_collector.c:428
> 46635de8 152 tQ 3974 rsbufq.c:166
>
> so looking at the 1st column the addr 0x46635000 is an address that would
> fall
> in the range of 0x444af000 - 0x4c63b000, so that 3328 bytes of memory (or
> what
> I refer to generally as a block or the doc is referring to as pool
> fragment)
> would be in the virtual segment who's seg id was "73564177".
>
> Jacques
>
>
> ************************************************************
> *******************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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