Without digging into the system's header files, you should be able to retrieve your current system's allowed number of processes per user with the command:
which is defined to return the system's current value for the maximum number of simultaneous processes per real user ID. Note that this says nothing about the size of the kernel's process table which must contain one slot for each process that is currently active. Note that in this case, active means has been started and its exit status has not yet been collected by its parent (or if its parent has died, collected by the system's garbage collector [a process named init on some systems]).
In the old days, the size of the process table was fixed when the kernel was built. Most of today's systems attempt to grow the pricess table as needed rather than failing fork()s when the process table fills up. But, if the kernel runs out of memory, a normal user's fork() will fail and a super-user's fork() may kill off a normal user's running process to allow the super-user to create a new process. What actually happens in these cases varies considerably from system to system.
Last edited by Don Cragun; 04-08-2019 at 11:15 PM..
Reason: Fix typo: s/systems/system's/
Hi ,
I need to count all processes contains the pattren "FND"
For Example:
I was reteriving the details of all processes related to "FND" by this command
$ ps -ef | grep FND
but now I just wanna count them .
Regards
Adel (2 Replies)
I have written a function that fills an array and another function where if a parameter is supplied it will jump to that part of the array and cat it to the screen.
I need to put in some checks to make sure the parameter supplied is firstly a number and then not a number great than the length of... (2 Replies)
I need a mechanism to fork child processes and all child processes should connect to a server.but the number of child processes should be limited(for ex:50)
Here's my pseudo, but I cant figure out how to limit the child process number. Should I use a semaphore? or what?
for(;;)... (3 Replies)
Hi
Is there a way to count how many processes a script has started, count how many of these have finished, and make the script wait if their difference goes over a given threshold?
I am using a script to repeatedly execute a code (~100x) which converts 2 data files into one .plt which is in... (4 Replies)
Hey I'm new in linux,
I'm looking for a code to check whether the parameter is a number or a string.
I have already tried this code:
eerste=$(echo $1 | grep "^*$">aux)
if
But it doesn't work.:confused:
Thanks (2 Replies)
Hi,
Is there a maximum number of processes kernel parameter in AIX.
Solaris has max_nprocs,
HP-UX has nproc,
I can only find max user process (maxuproc) for AIX.
Thanks,
Wilson. (3 Replies)
Morning,
Somebody can tell me in AIX 6.1 what is the different between the maxuproc (lsattr -El sys0 | grep max) and the for a user.
Example:
Oracle is limited by :
#ulimit -u
processes(per user) unlimited
But lsattr -El sys0| grep maxuproc show me :
maxuproc 16384
So... (1 Reply)
// AIX 6.1 & Power 7 server
I have maxuproc set to 16384.
lsattr -El sys0 -a maxuproc
maxuproc 16384 Maximum number of PROCESSES allowed per user True
What is the maximum number of maxuproc we can go for?
If I increase maxuproc to the higher number, what would be ramifications?
I... (1 Reply)
Hi Guys,
I am running RHEL6 and now my processes reach maximum limit.
How do I increase the maxuproc value?
Can I increase the value without rebooting the server?
Thanks in advance...
Please Help!!! (5 Replies)
Discussion started by: Phuti
5 Replies
LEARN ABOUT FREEBSD
fork
FORK(2) BSD System Calls Manual FORK(2)NAME
fork -- create a new process
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
pid_t
fork(void);
DESCRIPTION
The fork() system call causes creation of a new process. The new process (child process) is an exact copy of the calling process (parent
process) except for the following:
o The child process has a unique process ID.
o The child process has a different parent process ID (i.e., the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that,
for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the
child process can affect a subsequent read(2) or write(2) by the parent. This descriptor copying is also used by the shell to
establish standard input and output for newly created processes as well as to set up pipes.
o The child process' resource utilizations are set to 0; see setrlimit(2).
o All interval timers are cleared; see setitimer(2).
o The child process has only one thread, corresponding to the calling thread in the parent process. If the process has more than one
thread, locks and other resources held by the other threads are not released and therefore only async-signal-safe functions (see
sigaction(2)) are guaranteed to work in the child process until a call to execve(2) or a similar function.
RETURN VALUES
Upon successful completion, fork() returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
ERRORS
The fork() system call will fail and no child process will be created if:
[EAGAIN] The system-imposed limit on the total number of processes under execution would be exceeded. The limit is given by the
sysctl(3) MIB variable KERN_MAXPROC. (The limit is actually ten less than this except for the super user).
[EAGAIN] The user is not the super user, and the system-imposed limit on the total number of processes under execution by a single
user would be exceeded. The limit is given by the sysctl(3) MIB variable KERN_MAXPROCPERUID.
[EAGAIN] The user is not the super user, and the soft resource limit corresponding to the resource argument RLIMIT_NPROC would be
exceeded (see getrlimit(2)).
[ENOMEM] There is insufficient swap space for the new process.
SEE ALSO execve(2), rfork(2), setitimer(2), setrlimit(2), sigaction(2), vfork(2), wait(2)HISTORY
The fork() function appeared in Version 6 AT&T UNIX.
BSD May 31, 2013 BSD