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IDS Forum

Re: identify what is allocating memory

Posted By: JACQUES RENAUT
Date: Friday, 28 July 2017, at 11:09 a.m.

In Response To: Re: identify what is allocating memory (david@smooth1.co.uk)

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

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