On 2020-10-21 12:45, Sadique Urf Arbaz Sayyed wrote:
On Wednesday, October 21, 2020 at 4:14:05 PM UTC+5:30, Sadique Urf Arbaz Sayyed
wrote:
We started with a brand new windows server 2019 datacenter edition and installed
an infrastructure monitoring agent on it and strictly no other program. The
machine had 8 GB of memory. As part of monitoring NTP offset from sync'd host we
scheduled a ntpqexe. The problem started after 4-5 days, the memory utilisation
had increased to significant level >80%. On analysis we found it was a gradual
increase and using RAMMAP we saw every time the ntpq.exe will run it will leave
behind 24k of memory in PAGE Table with 0 B in Private. Moreover this issue is
specific to windows server 2019 we tried following same steps on windows server
2012 machine and it worked perfectly fine with no memory creeping issues.
Any help or pointer are appreciated
Full problem is mentioned here
https://social.technet.microsoft.com/Forums/en-US/d45ba91a-cc43-4010-9a2c-d65b1a4cc33a/windows-2019-server-ntp-increases-memory-utilisation-by-acquiring-page-table?forum=ws2019
From what you have posted above (I have not checked the MS forum) it
sounds like the leak is of "PAGE"-d memory consumption, not page tables
(also known in the NT world as hyperspace).
Question is what is actually registered as owning that page-able memory.
Maybe you have found a memory leak in the NTP server itself, maybe
something in NT 10.??.2019?? (server 2019) leaks memory every time ntpq
makes an UDP socket connection to the NTP service to query it.
There are some advanced tools for checking what owns outstanding global
(kernel) memory allocations on NT systems. However first you should
check the "commit charge" of the NTP service process, as that is a
direct measure of how much pageable virtual memory is allocated in the
user mode part of that process.
Enjoy
Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark. Direct +45 31 13 16 10
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