12-14-2018
Hi Jlliagre , MadeInGermany,
Thank you both for your reply and insight.
Quote:
b) the actual usage of swap is not limited by reservations.
Hmm, yes. Unused memory can be used (hopefully), but then, it is no more reported as reserved but as used. (That sounds logical, doesn't it?)
q1) Do you mean if
ProcessA has made reservation on the virtual swap (ram & disk), another
Process B can actually use this reserved space for actual physical paging into RAM and out to swap/disk ?
q2) If i still have free memory (ard 10G reported in memstat's free) but have physical swap being used (ard 3G in swap -l), what does this means then ?
Since reserved but free memory can be use by all, why is physical swap still being use ?
Doing vmstat for 30 minutes, did not see any counters jump for si/so, pi/po, and SR (all 0s) ?
Could i have some kind of spike @ certain timing (using up all the free ram), and cause the physical swap to be use ? < could this be 1 possiblity ?
Regards,
Noob
Last edited by javanoob; 12-14-2018 at 01:38 PM..
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LEARN ABOUT REDHAT
swapon
SWAPON(8) Linux Programmer's Manual SWAPON(8)
NAME
swapon, swapoff - enable/disable devices and files for paging and swapping
SYNOPSIS
/sbin/swapon [-h -V]
/sbin/swapon -a [-v] [-e]
/sbin/swapon [-v] [-p priority] specialfile ...
/sbin/swapon [-s]
/sbin/swapoff [-h -V]
/sbin/swapoff -a
/sbin/swapoff specialfile ...
DESCRIPTION
Swapon is used to specify devices on which paging and swapping are to take place. Calls to swapon normally occur in the system multi-user
initialization file /etc/rc making all swap devices available, so that the paging and swapping activity is interleaved across several
devices and files.
Normally, the first form is used:
-h Provide help
-V Display version
-s Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not available before Linux 2.1.25.
-a All devices marked as ``swap'' swap devices in /etc/fstab are made available. Devices that are already running as swap are silently
skipped.
-e When -a is used with swapon, -e makes swapon silently skip devices that do not exist.
-p priority
Specify priority for swapon. This option is only available if swapon was compiled under and is used under a 1.3.2 or later kernel.
priority is a value between 0 and 32767. See swapon(2) for a full description of swap priorities. Add pri=value to the option field
of /etc/fstab for use with swapon -a.
Swapoff disables swapping on the specified devices and files. When the -a flag is given, swapping is disabled on all known swap devices
and files (as found in /proc/swaps or /etc/fstab).
NOTE
You should not use swapon on a file with holes. Swap over NFS may not work.
SEE ALSO
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
FILES
/dev/hd?? standard paging devices
/dev/sd?? standard (SCSI) paging devices
/etc/fstab ascii filesystem description table
HISTORY
The swapon command appeared in 4.0BSD.
Linux 1.x 25 September 1995 SWAPON(8)