05-24-2013
Quote:
Originally Posted by
Chetanz
1) In the output of following command many processes are showing Pgsp>0; In that case can we say all the processes with Pgsp>0 are 'causing' the paging on system?
I am are these processes 'the cause'?
No, processes which does not active for a (long) time, will moved to the paging space device. At this time, where the VMM move the memory allocated by these process, You will see paging out operation. If this process is still inactive You will see only paging space used and no paging out or paging in operation. When this process becomes avtiv (eg. IO finished, no more lock on a requested resource, etc.) You will see paging in operations.
Quote:
Originally Posted by
Chetanz
2) Few processes are showing Pgsp>0 with "svmon" but with "ps aux" those are showing %MEM as 0.0 constantly Ex.PID= 5677206, below
what could be the reason?
Maybe this process is currently not activ. So have a look at the %CPU and TIME column for this process.
Have You tried to run NMON?
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LEARN ABOUT OPENDARWIN
dynamic_pager
dynamic_pager(8) BSD System Manager's Manual dynamic_pager(8)
NAME
dynamic_pager -- dynamic pager external storage manager
SYNOPSIS
dynamic_pager [-F filename] [-S filesize] [-H high-water-trigger] [-L low-water-trigger] [-P priority]
DESCRIPTION
The dynamic_pager daemon manages a pool of external swap files which the kernel uses to support demand paging. This pool is expanded with
new swap files as load on the system increases, and contracted when the swapping resources are no longer needed. The dynamic_pager daemon
also provides a notification service for those applications which wish to receive notices when the external paging pool expands or contracts.
OPTIONS
-F The base name of the filename to use for the external paging files. By default this is /private/var/vm/swapfile.
-S The fixed filesize [in bytes] to use for the paging files. By default dynamic_pager uses variable sized paging files, using larger
sized files as paging demands increase. The -S, -H and -L options disable that default and cause dynamic_pager to use a series of
fixed sized external paging files.
-H If there are less than high-water-trigger bytes free in the external paging files, the kernel will signal dynamic_pager to add a new
external paging file.
-L If there are more than low-water-trigger bytes free in the external paging files, the kernel will coalese in-use pages and signal
dynamic_pager to discard an external paging file. Low-water-trigger must be greater than high-water-trigger + filesize.
-P This option is currently unimplemented.
FILES
/private/var/vm/swapfile* Default external paging files.
SEE ALSO
macx_swapon(2), macx_swapoff(2).
Mac OS X July 8, 2003 Mac OS X