memory sharing - not shared memory

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Shared memory

Dear Reader, Is is necessary to attach / dettach the shared memory segments for write operations , if more than one program is accessing same shared memory segments.. I have used semaphore mutex and still I'm getting segmentation fault when I write to the segment when other program is already...

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Shared memory shortage but lots of unused memory

I am running HP-UX B.11.11. I'm increasing a parameter for a database engine so that it uses more memory to buffer the disk drive (to speed up performance). I have over 5GB of memory not being used. But when I try to start the DB with the increased buffer parameter I get told. "Not...

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Between mmap and shared memory which is the best method of sharing data between multiple applications, interms of speed?

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all about shared memory

Hi all :confused: , I am new to unix.I have been asked to implement shared memory in user's mode.What does this mean?What is the difference it makes in kernel mode and in users mode?What are the advantages of this impemenation(user's mode)? And also i would like to know why exactly shared...

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Shared Memory

Hi, Using ipcs we can see shared memory, etc.. details. How can I add/remove shared memory(command name)? Thanks, Naga:cool:

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shared memory

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Memory sharing with NCURSES

Hey, Im using a shared memory segment to share a WINDOW structure among 2 processes. Basically I'm building a multi-player snake game in which multiple prrocesses access the window. The 'parent' process initializes the shared memory segment and puts the window in it. I can access and perform...

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Shared library with acces to shared memory.

Hello. I am new to this forum and I would like to ask for advice about low level POSIX programming. I have to implement a POSIX compliant C shared library. A file will have some variables and the shared library will have some functions which need those variables. There is one special...

LEARN ABOUT HPUX

swapmem_on

swapmem_on(5)							     OBSOLETE							     swapmem_on(5)

NAME

       swapmem_on - OBSOLETE kernel tunable parameter

DESCRIPTION

       The tunable is obsolete.  Processes will always be allowed to use pseudo-swap space if it is available.

       In previous versions of HP-UX, system configuration required sufficient physical swap space for the maximum possible number of processes on
       the system.  This is because HP-UX reserves swap space for a process when it is created, to ensure that a running process never needs to be
       killed due to insufficient swap.

       This  was difficult, however, for systems needing gigabytes of swap space with gigabytes of physical memory, and those with workloads where
       the entire load would always be in core.  This tunable was created to allow system swap space to be less than core memory.   To	accomplish
       this,  a  portion  of  physical	memory	is  set aside as "pseudo-swap" space.  While actual swap space is still available, processes still
       reserve all the swap they will need at fork or execute time from the physical device or file system swap.  Once	this  swap  is	completely
       used,  new  processes  do  not  reserve	swap, and each page which would have been swapped to the physical device or file system is instead
       locked in memory and counted as part of the pseudo-swap space.

WARNINGS

       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						     swapmem_on(5)

10 More Discussions You Might Find Interesting

1. Programming

Shared memory

Discussion started by: joseph_shibu

2. UNIX for Advanced & Expert Users

Shared memory shortage but lots of unused memory

Discussion started by: cjcamaro

3. UNIX for Advanced & Expert Users

mmap vs shared memory - which is best for sharing data between applications?

Discussion started by: nmds

4. Linux

all about shared memory

Discussion started by: vijaya2006