Check out these kernel parameters.
This will set it system wide, and with ulimit command you can change per user inside .profile, but not above the kernel parameter maxfiles_lim.
I am trying to find a way to check the current status of a file. Such as some cron job processes are dependent on the completion of others. if a file is currently being accessed / modified or simply open state I will wait until it is done being processed before attempting the next process on that... (3 Replies)
Hi,
look at the following code:
The client after estabilishing a connection with the server does the following:
if ((peter = fopen(argv, "r")) == NULL){
printf("errore\n");
exit(0);
}
... (11 Replies)
I have a requirement to close all the file descriptors from 3 to 1024 for a particular application.
Right now, this is how I do it ..
for ( int i = 3 ; i <= 1024; ++i )
close(i);
The change I am looking at is, I want to do away with the number 1024 and replace it with a constant which... (4 Replies)
Im working on writing a small operating system. I am currently working on implementing dup, dup2, pipe, and close and I need to implement some type of file descriptor table in my PCB.
I was wondering if there is anyone who is familiar with linux/unix implementation of these tables who could... (6 Replies)
Hello All,
Im opening a file desciptor in perl and sending data using print CMD "$xyz".
is there a limit to the length of the string that I can give to this CMD at a time. (3 Replies)
I am trying to write a script which will only show me the file descriptor count for a process/pid. My script will return me the count only not the whole output. For example, I would like my script to return the output 23 this case, not the whole output.
Can anybody please help me how do I get... (11 Replies)
Hi,
I am trying to read a file line-by-line in a while loop, and perform some tasks which involves non-interactive SSH to a remote server. The code looks something like this --
#!/usr/bin/ksh
export myFile=/path/to/my/file.load
while read line
do
do something
## Adding the SSH... (2 Replies)
Greetings.
I am happily using constructs like the following; I have set -x to show fine distinctions.
$ exec 4> afile
+ exec
+ 4> afile
$ print -u4 This is the first line in afileAs you can see from the -x expansion, the shell performed the exec command and redirected file descriptor to... (4 Replies)
Discussion started by: rpaskudniak
4 Replies
LEARN ABOUT HPUX
nflocks
nflocks(5) File Formats Manual nflocks(5)NAME
nflocks - maximum number of file locks
VALUES
Failsafe
Default
The default value is computed at runtime and depends on the amount of physical memory on the system. For small memory systems (less than
1GB), the default is 1200. For systems with more than 1GB of memory, the default is 4096, or 4K.
Allowed values
The minimum value is 50. The maximum value is 0x1000000.
Specify a positive integer value.
DESCRIPTION
The tunable represents the maximum number of file locks that are available system-wide.
Who Is Expected to Change This Tunable?
This tunable should be changed on systems expected to run applications with large number of file locks. When changing this number note
that one file may have several locks, and databases that use or may need an exceptionally large number of locks.
Restrictions on Changing
This tunable is dynamic (tuning will take effect immediately on the running system). When the value of is dynamically tuned it cannot be
set to a value lower than the current number of file locks in the running kernel.
When Should the Value of This Tunable Be Raised?
The value should be increased when large numbers of file locks are expected to be used simultaneously.
What are the Side Effects of Raising the Value?
The kernel allocates a portion of memory proportional to the new value of and frees memory proportional to the old value. Additional mem-
ory is consumed as new locks are created.
When Should the Value of This Tunable Be Lowered?
The value can be lowered to limit the number of available file locks on a system and reduce memory consumption.
What are the Side Effects of Lowering the Value?
The kernel allocates a portion of memory proportional to the new value of and frees memory proportional to the old value. Additional mem-
ory may be released to the system to be used for other purposes if the usage was ever higher than this new value.
What Other Tunable Values Should Be Changed at the Same Time?
None.
WARNINGS
Setting to the maximum value(0x1000000) will result in a large memory allocation (~.5GB). A request to change the value of will fail with
set if there is either not enough free memory or the remaining free memory would be so small as to potentially hinder system performance.
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.
SEE ALSO kctune(1M), sam(1M), gettune(2), settune(2), fcntl(2), lockf(2).
Tunable Kernel Parameters nflocks(5)