VFS_PREOPEN(8) System Administration tools VFS_PREOPEN(8)NAME
vfs_preopen - Hide read latencies for applications reading numbered files
SYNOPSIS
vfs objects = preopen
DESCRIPTION
This VFS module is part of the samba(7) suite.
This module assists applications that want to read numbered files in sequence with very strict latency requirements. One area where this
happens in video streaming applications that want to read one file per frame.
When you use this module, a number of helper processes is started that speculatively open files and read a number of bytes to prime the
file system cache, so that later on when the real application's request comes along, no disk access is necessary.
This module is stackable.
OPTIONS
preopen:names = /pattern/
preopen:names specifies the file name pattern which should trigger the preopen helpers to do their work. We assume that the files are
numbered incrementally. So if your file names are numbered FRAME00000.frm FRAME00001.frm and so on you would list them as
preopen:names=/FRAME*.frm/
preopen:num_bytes = BYTES
Specifies the number of bytes the helpers should speculatively read, defaults to 1.
preopen:helpers = NUM-PROCS
Number of forked helper processes, defaults to 1.
preopen:queuelen = NUM-FILES
Number of files that should be speculatively opened. Defaults to the 10 subsequent files.
VERSION
This man page is correct for version 3.3 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
The PREOPEN VFS module was created with contributions from Volker Lendecke and the developers at IBM.
Samba 4.0 06/17/2014 VFS_PREOPEN(8)
Check Out this Related Man Page
VFS_AIO_FORK(8) System Administration tools VFS_AIO_FORK(8)NAME
vfs_aio_fork - implement async I/O in Samba vfs
SYNOPSIS
vfs objects = aio_fork
DESCRIPTION
This VFS module is part of the samba(7) suite.
The aio_fork VFS module enables async I/O for Samba on platforms where the system level Posix AIO interface is insufficient. Posix AIO can
suffer from severe limitations. For example, on some Linux versions the real-time signals that it uses are broken under heavy load. Other
systems only allow AIO when special kernel modules are loaded or only allow a certain system-wide amount of async requests being scheduled.
Systems based on glibc (most Linux systems) only allow a single outstanding request per file descriptor.
To work around all these limitations, the aio_fork module was written. It uses forked helper processes instead of the internal Posix AIO
interface to create asynchronousity for read and write calls. It has no parameters, it will create helper processes when async requests
come in as needed. Idle helper processes will be removed every 30 seconds.
This module is stackable.
EXAMPLES
Straight forward use:
[cooldata]
path = /data/ice
vfs objects = aio_fork
VERSION
This man page is correct for version 4.0.0 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
Samba 4.0 06/17/2014 VFS_AIO_FORK(8)
how I can change content ( know it) and part of a file name based on a pattern.
i have a file xxx_yyy
I also have to change inside contect frm xxx to yyy. I can do that with sed but how i can change the part of file name in the same time processing in for each *; do loop
thanks (0 Replies)
6.nohup cmn is used to
Prot execn of pgm frm aborting when hangup s/g is rxd
Not hangup modem
Disconn a node frm s/m
Chng execn prev of pgm
.wat is the o/p? Cut -d”” -f3 file1/sort -r
Display 3rd col of file 1 in asc order
Disp 3rd col of file 1 in desc
Not ... (1 Reply)
I have multiple file with names
april.0001.frm.edi
april.0002.frm.edi
I created a list with all the file names which has "860" inside the file and named the list as april-860-list
I need to move all the files to name
CHRY.860.01
CHRY.860.02
from that list.
How do I do that?
I... (3 Replies)
I have come accross kernel_config a number of times.I cant understand how it is different frm menuconfig.The latter configures (enables/disables) modules for kernel.
I have read that kernel_config goes to kernel source and does a make menuconfig.
If that is so,then what exactly is the... (2 Replies)
as we use du - sh *.frm
In This command It will show the list of files and size
But I want the Total size that these files in directory with extension .frm
How can we do This (6 Replies)