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Top Forums UNIX for Advanced & Expert Users Command to check memory used or consumed by OS kernel Post 303000089 by sam@sam on Tuesday 4th of July 2017 06:49:50 AM
Old 07-04-2017
Hi Bakunin,

I have many application running on LINUX box, RAM allocated on this box is 15GB
I want to know how much memory is consumed by Applications and OS

Code:
              total        used       free     shared    buffers     cached
Mem:            15G         14G       627M       932K       1.4G       916M
-/+ buffers/cache:        12G       2.9G
Swap:           9G          898M       9.1G


From application level only 12 GB RAM is allocated out of it only 8 GB RAM is consumed currently

But I'm unable to figure out how much RAM is consumed by OS on an average?
If I have a margin of how much RAM is consumed to OS then in future if I need to add any new software/app I can recommend for extra RAM in LINUX BOX, hope you understand

Moderator's Comments:
Mod Comment edit by bakunin: please use CODE-tags for data too, thank you.

Last edited by bakunin; 07-04-2017 at 08:19 AM..
 

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SYSTEMD-CRYPTSETUP-GENERATOR(8) 			   systemd-cryptsetup-generator 			   SYSTEMD-CRYPTSETUP-GENERATOR(8)

NAME
systemd-cryptsetup-generator - Unit generator for /etc/crypttab SYNOPSIS
/lib/systemd/system-generators/systemd-cryptsetup-generator DESCRIPTION
systemd-cryptsetup-generator is a generator that translates /etc/crypttab into native systemd units early at boot and when configuration of the system manager is reloaded. This will create systemd-cryptsetup@.service(8) units as necessary. systemd-cryptsetup-generator implements systemd.generator(7). KERNEL COMMAND LINE
systemd-cryptsetup-generator understands the following kernel command line parameters: luks=, rd.luks= Takes a boolean argument. Defaults to "yes". If "no", disables the generator entirely. rd.luks= is honored only by initial RAM disk (initrd) while luks= is honored by both the main system and the initrd. luks.crypttab=, rd.luks.crypttab= Takes a boolean argument. Defaults to "yes". If "no", causes the generator to ignore any devices configured in /etc/crypttab (luks.uuid= will still work however). rd.luks.crypttab= is honored only by initial RAM disk (initrd) while luks.crypttab= is honored by both the main system and the initrd. luks.uuid=, rd.luks.uuid= Takes a LUKS superblock UUID as argument. This will activate the specified device as part of the boot process as if it was listed in /etc/crypttab. This option may be specified more than once in order to set up multiple devices. rd.luks.uuid= is honored only by initial RAM disk (initrd) while luks.uuid= is honored by both the main system and the initrd. If /etc/crypttab contains entries with the same UUID, then the name, keyfile and options specified there will be used. Otherwise, the device will have the name "luks-UUID". If /etc/crypttab exists, only those UUIDs specified on the kernel command line will be activated in the initrd or the real root. luks.name=, rd.luks.name= Takes a LUKS super block UUID followed by an "=" and a name. This implies rd.luks.uuid= or luks.uuid= and will additionally make the LUKS device given by the UUID appear under the provided name. rd.luks.name= is honored only by initial RAM disk (initrd) while luks.name= is honored by both the main system and the initrd. luks.options=, rd.luks.options= Takes a LUKS super block UUID followed by an "=" and a string of options separated by commas as argument. This will override the options for the given UUID. If only a list of options, without an UUID, is specified, they apply to any UUIDs not specified elsewhere, and without an entry in /etc/crypttab. rd.luks.options= is honored only by initial RAM disk (initrd) while luks.options= is honored by both the main system and the initrd. luks.key=, rd.luks.key= Takes a password file name as argument or a LUKS super block UUID followed by a "=" and a password file name. For those entries specified with rd.luks.uuid= or luks.uuid=, the password file will be set to the one specified by rd.luks.key= or luks.key= of the corresponding UUID, or the password file that was specified without a UUID. rd.luks.key= is honored only by initial RAM disk (initrd) while luks.key= is honored by both the main system and the initrd. SEE ALSO
systemd(1), crypttab(5), systemd-cryptsetup@.service(8), cryptsetup(8), systemd-fstab-generator(8) systemd 237 SYSTEMD-CRYPTSETUP-GENERATOR(8)
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