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You may experience 2 up to 10 seconds "glitch time" when we restart MySQL. We expect to make these adjustments around 1AM Eastern Daylight Saving Time (EDT) US.

"Where is my memory? How to fix it ?"

Post #303037756 by gull04 on Tuesday 13th of August 2019 03:12:28 AM


There is an excellent Oracle Document covering this on the Oracle site Document ID 1663862.1 it give in depth information covering your monitoring issue.

This should at least point you in the right direction.

Due to the way that the MMU and ZFS behave, this can be an issue for monitoring tools.

I've also just noticed that you say that you've recently noticed the increase in memory utlisation, an other possible cause could be memory leakage caused by applications code not fully releasing memory. Do you have any trending information, does your monitoring tool produce such information - this is generally easy to see over a longer term.



Last edited by gull04; 4 Days Ago at 04:18 AM.. Reason: More information.
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NUMACTL(8)						   Linux Administrator's Manual 						NUMACTL(8)

numastat - Print statistics about NUMA memory allocation
numastat displays NUMA allocations statistics from the kernel memory allocator. Each process has NUMA policies that specifies on which node pages are allocated. See set_mempolicy(2) or numactl(8) on details of the available policies. The numastat counters keep track on what nodes memory is finally allocated. The counters are separated for each node. Each count event is the allocation of a page of memory. numa_hit is the number of allocations where an allocation was intended for that node and succeeded there. numa_miss shows how often an allocation was intended for this node, but ended up on another node due to low memory. numa_foreign is the number of allocations that were intended for another node, but ended up on this node. Each numa_foreign event has a numa_miss on another node. interleave_hit is the number of interleave policy allocations that were intended for a specific node and succeeded there. local_node is incremented when a process running on the node allocated memory on the same node. other_node is incremented when a process running on another node allocated memory on that node.
numactl(8) set_mempolicy(2) numa(3)
numastat output is only available on NUMA systems. numastat assumes the output terminal has a width of 80 characters and tries to format the output accordingly.
watch -n1 numastat watch -n1 --differences=accumulative numastat
The output formatting on machines with a large number of nodes could be improved. SuSE Labs Nov 2004 NUMACTL(8)

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