So, We were trying to move to Fedora 33 from Centos7 for our jvm and then we
found the memory consumption to be higher than Centos7.
we did the following:
Step :1 Narrow the problem with a simple c-code
#include<unistd.h>
int main()
{
pause();
return 0;
}
Running this c-program on Fedora 33 yields 660 KB . While on centos7, it only
takes 348 KB,
Step 2:
Narrow down the kernel versions .
So, we tried testing different fedora VMs that we had and one of the VMs was
running fedora 20. We were able to boot
1. kernel-3.11.10-301.fc20.x86_64
2. kernel-3.17.4-200.fc20.x86_64
With kernel-3.11, pmap tells the RSS was only 388KB . Screenshot of pmap here:
(https://ibb.co/D5zTXvs)
while on kernel-3.17 its 920KB (https://ibb.co/vLByKkD) .
From the pmap mappings, we see both the binaries are using the same glibc and
ld.so etc. So, this seems like nothing has changed on the user-land while the
RSS measurement has more than doubled.
Could somehow have an idea on what else could explain the reason for his memory
increase? This seems like something has changed from the kernel side in terms
of how RSS was measured or the defaults have changed?
Regards,
-Anand
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