01-26-2015
The distinguished buffer and cache memory is inside the kernel.
An application does not see this. Instead it the sees static memory, stack memory, heap memory.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Can you please tell me how to find out System Memory (RAM) for a AIX unix server?
The command prtconf will do for Solaris but I don't know for AIX Unix. (1 Reply)
Discussion started by: anilkumar
1 Replies
2. Programming
hi,
i'm writing a program that is running always...
but, i have a problem that memory is increasing..
i want to know whether does stack size inscease or not, when program is running..
i don't know what is the cause stack or heap...
i need some help.. :( (1 Reply)
Discussion started by: netfer
1 Replies
3. HP-UX
Hi,
Does anyone know an easy way of getting the memory usage on a UNIX box? I basically want to find the total % available/in use. Running vmstat gives me 'avm' and 'free' but come in bytes and not percents. Didn't see a switch in sar that just gave me the memory stats similar to Sun's -r... (4 Replies)
Discussion started by: jonesin
4 Replies
4. UNIX for Advanced & Expert Users
i am looking for the books or web-sites which
explains the unix memory management in detail.
do you know any useful material? (1 Reply)
Discussion started by: gfhgfnhhn
1 Replies
5. HP-UX
I don't know if this is better suited for the application section, but here goes.
We are currently running HP-UX 11 as our database server. The database is Progress version 9.1C.
As of late, some of our batch processes that run on the UNIX db server are erroring out because of what appear to... (3 Replies)
Discussion started by: eddiej
3 Replies
6. HP-UX
Hi,
I have a HP-Unix server, version B.11.23. Can someone tell me how to find out the physical memory & virtual memory (swap) in my server? & what is Page fault? & is there any limitation for page fault?
Thank you. Your help is appreciated. (7 Replies)
Discussion started by: Amol21
7 Replies
7. Shell Programming and Scripting
Hi,
I am creating monitoring scripts in HP unix for that i need CPU utilization and memory utilization in HP unix.
for CPU utilization i am using TOP command
for Memory utilizaion i am not able to use glance command in scripts.
means i am not able to redirect and stop.
apart from... (1 Reply)
Discussion started by: rsivasan
1 Replies
8. Programming
Hello,
When creating shared memory in C, should be remove shared memory with shmctl function when don't need it. If it didn't remove, occupied shared memory stay and remain.
If we create shared memory repeatedly without removing unusable shared memory, /dev/shm will full.
Does Unix or... (1 Reply)
Discussion started by: pronetin
1 Replies
9. Shell Programming and Scripting
Hi friends iam new to unix. how to extend memory in UNIx.
what are the possible scenarios to increase memory.
I just noticed we have swap memory also but when and how to use it. and what is the correct way to increase RAM. please provide information or some useful commands. Thanks (2 Replies)
Discussion started by: saidesh
2 Replies
10. UNIX for Beginners Questions & Answers
So, I would ask you a piece of advice about which books or titles could give me comprehensive information about virtual memory in UNIX. Especially, I would found out that virtual address translation corresponds structures of kernel!
Thanks! (2 Replies)
Discussion started by: Fadedfate
2 Replies
LEARN ABOUT HPUX
vxfs_bc_bufhwm
vxfs_bc_bufhwm(5) File Formats Manual vxfs_bc_bufhwm(5)
NAME
vxfs_bc_bufhwm - VxFS buffer cache high water mark(determines the VxFS buffer cache size)
SYNOPSIS
VALUE
Specify an integer value.
Minimum
6144 KB
Maximum
None
Default
0
DESCRIPTION
VxFS maintains a buffer cache in the kernel for frequently accessed file system metadata in addition to the HP-UX kernel buffer cache that
caches the file data. tunable parameter determines the size of the VxFS buffer cache (the maximum amount of memory that can be used to
cache VxFS metadata).
The default value computed based on the amount of system memory ensures good system performance across a wide range of applications.
The value of is specified in kilobytes. To improve performance during application loads that cause frequent file system metadata changes on
the system (for example, a high rate of file creation or deletion, or accessing large directories), change the value of
Notes
Use the command to monitor buffer cache statistics and inode cache usage.
EXAMPLES
Set the maximum of size of buffer cache at 300000:
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or its meaning may change in the 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
SEE ALSO
kctune(1M), vxfsstat(1M), vx_maxlink(5), vx_ninode(5), vxfs_ifree_timelag(5).
Tunable Kernel Parameters vxfs_bc_bufhwm(5)