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Linux - Settings

Core file name

It is possible to personalize the core file name, for example:

echo "core.%e.%p" > /proc/sys/kernel/core_pattern

In order to keep this setting at each boot, you need to set up /etc/sysctl.conf.

kernel.core_pattern = core.%e.%p

The following flags can also be used.

%p:       pid
%:   '%' is dropped
%%:       output one '%'
%u:       uid
%g:       gid
%s:       signal number
%t:       UNIX time of dump
%h:       hostname
%e:       executable filename

Max shared memory and pages

Increasing the shared memory that Linux kernel can use might be critical depending on the application used (especially Postgres version prior to 9.3). So add the following lines in /etc/sysctl.conf.

(for 1GB)
kernel.shmall = 262144
kernel.shmmax = 1073741824
(for 2GB)
kernel.shmall = 524288
kernel.shmmax = 2147483648

Swapping

Only swap +50% of memory that can be handled by applications. Useful to not freeze a laptop when debugging memory allocation problems on an application.

$ cat oom.conf
vm.overcommit_memory = 2
vm.overcommit_ratio = 50

perf

Allow all perf events to be taken.

$ cat perf_settings.conf
kernel.perf_event_paranoid = -1

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