01-21-2009
Quote:
Originally Posted by
Jaywantmm
Hi ,
As I am new to Linux server, I am facing some doubts like: On linux server virtual memory usage goes to 99%, but I have Threshold limit of 95%. So it crossed the threshold limit and alarmd.
Yesterday I moniterd the server using TOP command, and found some of Tibco process was consuming much memory. Since I stopped the 4 tibco process, then the memory usage become below threshold, but again once I restarted the stopped processes, that process again consuming same memory as previos and memory usage again going to 99%.
But suddenly today morning I saw the memory usage, it is 39% only. (All same preocess are running on server with same memory consumption, I varifid.) Nothing done to server or processes running on server.
Can anyone give me some inputs on
#How come this scenario should happen??
because tibco decides for whatever reason to consume vast amounts of memory. linux doesn't control how much memory tibco wants, tibco does.
Quote:
#The tibco processes which was consuming much memory, how will be different from other tibco processes which was normal??
again, that's a tibco thing, not a linux thing.
Quote:
#What will be the cause of memory releasing automatically, as all process are running with same memory consumption??
something in tibco. linux doesn't decide if tibco will hog memory, tibco does.
Quote:
#If same incident occured in future, then how to release memory??
unless the tibco people give you a better answer, restart the tibco program. (not just halt then resume.)
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LEARN ABOUT REDHAT
vmstat
VMSTAT(8) Linux Administrator's Manual VMSTAT(8)
NAME
vmstat - Report virtual memory statistics
SYNOPSIS
vmstat [-n] [delay [ count]]
vmstat[-V]
DESCRIPTION
vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity.
The first report produced gives averages since the last reboot. Additional reports give information on a sampling period of length delay.
The process and memory reports are instantaneous in either case.
Options
The -n switch causes the header to be displayed only once rather than periodically.
delay is the delay between updates in seconds. If no delay is specified, only one report is printed with the average values since boot.
count is the number of updates. If no count is specified and delay is defined, count defaults to infinity.
The -V switch results in displaying version information.
FIELD DESCRIPTIONS
Procs
r: The number of processes waiting for run time.
b: The number of processes in uninterruptable sleep.
w: The number of processes swapped out but otherwise runnable. This
field is calculated, but Linux never desperation swaps.
Memory
swpd: the amount of virtual memory used (kB).
free: the amount of idle memory (kB).
buff: the amount of memory used as buffers (kB).
Swap
si: Amount of memory swapped in from disk (kB/s).
so: Amount of memory swapped to disk (kB/s).
IO
bi: Blocks sent to a block device (blocks/s).
bo: Blocks received from a block device (blocks/s).
System
in: The number of interrupts per second, including the clock.
cs: The number of context switches per second.
CPU
These are percentages of total CPU time.
us: user time
sy: system time
id: idle time
NOTES
vmstat does not require special permissions.
These reports are intended to help identify system bottlenecks. Linux vmstat does not count itself as a running process.
All linux blocks are currently 1k, except for CD-ROM blocks which are 2k.
FILES
/proc/meminfo
/proc/stat
/proc/*/stat
SEE ALSO
ps(1), top(1), free(1)
BUGS
Does not tabulate the block io per device or count the number of system calls.
AUTHOR
Written by Henry Ware <al172@yfn.ysu.edu>.
Throatwobbler Ginkgo Labs 27 July 1994 VMSTAT(8)