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Full Discussion: Not using more than 8G of memory
Top Forums UNIX for Advanced & Expert Users Not using more than 8G of memory Post 33838 by Perderabo on Tuesday 21st of January 2003 03:43:15 PM
Old 01-21-2003
Re: Not using more than 8G of memory
Quote:
Originally posted by greddy09sc
I have messed with the /etc/system parameters settings and it is not the problem
Let's take another look at the system file just to be sure...

I'm guessing that you have maxusers set way too low. Here is a command to display the current value, but you must type this correctly because it is a dangerous command:
echo "maxusers/D" | adb -k /dev/ksyms /dev/mem

This is controlled by a setting in /etc/system, but you should probably not set it at all. It should default to 2048 on your system.

One of the values controlled by maxusers is max_nprocs. A maxusers of 2048 will result in a max_nprocs of 30000. You are probably bumping in to max_nprocs. You can display that with:
echo "max_nprocs/D" | adb -k /dev/ksyms /dev/mem

max_nprocs is the maximum number of processes allowed on the system. Once that limit is reached, fork() will fail.
 

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LEARN ABOUT X11R4

mem

MEM(4)                                                       Linux Programmer's Manual                                                      MEM(4)

NAME

       mem, kmem, port - system memory, kernel memory and system ports

DESCRIPTION

       /dev/mem is a character device file that is an image of the main memory of the computer.  It may be used, for example, to examine (and even
       patch) the system.

       Byte addresses in /dev/mem are interpreted as physical memory addresses.  References to nonexistent locations cause errors to be returned.

       Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present.

       Since Linux 2.6.26, and depending on the architecture, the CONFIG_STRICT_DEVMEM kernel configuration option limits the areas which  can  be
       accessed through this file.  For example: on x86, RAM access is not allowed but accessing memory-mapped PCI regions is.

       It is typically created by:

           mknod -m 660 /dev/mem c 1 1
           chown root:kmem /dev/mem

       The  file  /dev/kmem  is  the same as /dev/mem, except that the kernel virtual memory rather than physical memory is accessed.  Since Linux
       2.6.26, this file is available only if the CONFIG_DEVKMEM kernel configuration option is enabled.

       It is typically created by:

           mknod -m 640 /dev/kmem c 1 2
           chown root:kmem /dev/kmem

       /dev/port is similar to /dev/mem, but the I/O ports are accessed.

       It is typically created by:

           mknod -m 660 /dev/port c 1 4
           chown root:kmem /dev/port

FILES

       /dev/mem
       /dev/kmem
       /dev/port

SEE ALSO

       chown(1), mknod(1), ioperm(2)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux                                                               2015-01-02                                                              MEM(4)
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