High RAM usage, extremely low swapping Post: 302624571

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

low RAM

Hy, I've an 486 dx2 laptop an I want to run unix on it, the problem is it has only 4 megabytes of ram, so my question is; does anybody know an unix based OS which runs with only 4 mb? thanx

2. UNIX for Advanced & Expert Users

Sun: High kernel usage & very high load averages

Hi, I am seeing very high kernel usage and very high load averages on my system (Although we are not loading much data to our database). Here is the output of top...does anyone know what i should be looking at? Thanks, Lorraine last pid: 13144; load averages: 22.32, 19.81, 16.78 ...

3. Solaris

malloc returning NULL if freemem high & swapmem low

Hi All, In my application malloc is returning NULL even though there is sufficient amount of free memory is available but swap memory is low. Is this possible that, if free memory is high & swap memory is low, malloc will not be able to allocate memory & return NULL ?:) Kindly look into...

4. Shell Programming and Scripting

low & high values

on the file Ftp'd from the mainframe ,do we have any UNIX command to replace mainframe low and values to space or null. i tried using tr and it doesn't work ... Thanks

5. Shell Programming and Scripting

Picking high and low variables in a bash script - possible?

Is it possible to have a bash script pick the highest and lowest values of four variables? I've been googling for this but haven't come up with anything. I have a script that assigns variables ($c0, $c1, $c2, and $c3) based on the coretemps from grep/sed statements of sensors. I'd like to also...

6. Shell Programming and Scripting

Split file into chunks of low & high byte

Hi guys, i have a question about spliting a binary file into 2 chunks. First chunk with all high bytes and the second one with all low bytes. What unix tools can i use? And how can this be performed? I looked in manpages of split and dd but this does not help. Thanks

7. UNIX for Advanced & Expert Users

Extremely high kernel CPU Usage (Solaris 10 SPARC)

I've got a domain running on a few boards of a 25k. I'm seeing very high kernel cpu usage in top and cant' quite explain it. System runs a large number of smallish Oracle 10g2 databases (30), used mainly for development. load average: 36.63, 36.68, 37.42 2489 processes: 2452 sleeping, 21...

8. UNIX for Dummies Questions & Answers

Kernel/ user space and high/ low mem

Need some clarification on this.... 1. how are kernel/ user spaces and high/low memory related? 2. What do they all mean when i have the kernel command line as: "console=ttyS0,115200 root=/dev/sda2 rw mem=exactmap memmap=1M@0 memmap=96M@1M irqpoll" or 2. what do mem and memmap mean in...

9. AIX

High Runqueue (R) LOW CPU LOW I/O Low Network Low memory usage

Hello All I have a system running AIX 61 shared uncapped partition (with 11 physical processors, 24 Virtual 72GB of Memory) . The output from NMON, vmstat show a high run queue (60+) for continous periods of time intervals, but NO paging, relatively low I/o (6000) , CPU % is 40, Low network....

LEARN ABOUT HPUX

allocate_fs_swapmap

allocate_fs_swapmap(5)						File Formats Manual					    allocate_fs_swapmap(5)

NAME

       allocate_fs_swapmap - determines when swapmap structures are allocated for filesystem swap

VALUES

   Failsafe
   Default
   Allowed values
       or

DESCRIPTION

       The tunable is used to determine whether to allocate all needed filesystem swap structures during the initialization of the filesystem swap
       device or wait until they are needed.  Pre-allocation of all filesystem swap structures upon initialization saves time during  later  usage
       of the filesystem swap, and prevents later allocation failure due to physical memory contention.

       Dynamic allocation decreases the memory footprint of the filesystem swap system.

   Who is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       Systems under heavy memory load may not be able to acquire enough memory to hold the swap mapping structures for an addition of file system
       swap.  These calls to add swap would fail with the error though presumably they would be retried.  Frequent failure  on	file  system  swap
       addition with would merit enabling this tunable.

   What Are the Side Effects of Raising the Value?
       All  the  swap  map structures for each file system swap device would be preallocated during swap initialization at kernel boot, increasing
       the memory footprint of the kernel.  The amount of increase depends on the number and size of file system swap devices.

   When Should the Value of This Tunable Be Lowered?
       Systems with limited memory available to the kernel that also have limited use of file system swap devices should disable this  tunable	to
       decrease kernel memory usage.

   What Are the Side Effects of Lowering the Value?
       File system swap additions may fail with when memory contention is high.

   What Other Tunable Values Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters					    allocate_fs_swapmap(5)