vm and buffer cache Post: 20424

10 More Discussions You Might Find Interesting

1. Filesystems, Disks and Memory

buffer cache information

anybody please tell me how do i get all the information about buffer cache in hp-ux .if anybody familiar with the system call them please specify . i found the extern variables in /sys/buf.h . but that didn't help .:)

2. HP-UX

Buffer Cache

What is the "Buffer Cache" used for?

3. Solaris

Unix Cache / Buffer

Does anyone know how the unix buffer / cache is set in a Solaris based system ? ( I presume it is a kernel based setting ) I notice from SAR -d that my read cache is consistently at 100% but my write cache frequently falls below 65%. What does this mean. Should I be tuning the write cache and...

4. Red Hat

buffer cache size

hi everyone, can any one help change the buffer cache size in redhat and suse?? this error i got when i installed oracle 10g and it went well and when i try to mount the database using startup cmd it says too many buffer cache parameters (error code : ora-1034) thnq in advance

5. UNIX for Dummies Questions & Answers

reduce buffer cache allocation?

Hi, Is it possible to reduce the amount of buffer cache in the memory allocation of a Unix Server? If so where can I do that? Also, does buffer cache count as tied up memory, or will it decrease as more memory is requested by other programs.

6. Filesystems, Disks and Memory

Buffer Cache Stats from /proc/meminfo

Hi, I am trying to understand the role of buffer cache in block I/O. I am monitoring /proc/meminfo, my question is does the value of 0 for 'buffers', mean that any subsequent disk read issued by a process, would get the data physically from the disk, and not an allocated buffer for the block? ...

7. Linux

getting info on Cache Size, Data Cache etc..

Hi all I saw in Microsoft web site www.SysInternals.com a tool called CoreInfo from able to print out on screen the size of the Data and Instruction caches of your processor, the Locigal to Physical Processor mapping, the number of the CPU sockets. etc.. Do you know if in Linux is available a...

8. Linux

File cache /Page cache Linux

Hi All, could any one point out any open source test-suites for "File cache" testing and as well as performance test suites for the same. Currently my system is up with Linux/ext4. Regards Manish

9. UNIX for Advanced & Expert Users

Deciding whether to get a buffer cache block or inode block

I was reading a book on UNIX internals "The design of the UNIX Operating system." There are two memory structures that are confusing me: 1) Buffer cache 2) Inode cache My questions are 1) Does a process get both buffer cache and Indoe cache allocated when it opens/creates a file? 2) if no,...

10. Shell Programming and Scripting

bash history buffer cache

Moderators, Please excuse if I am in the wrong section. I have a question that someone may know the answer to. We know that a current bash shell keeps a record of all commands in a buffer. When the shell is terminated this buffer is written out to ~/.bash_history for the user. I know...

LEARN ABOUT OPENDARWIN

vm_stat

VM_STAT(1)						    BSD General Commands Manual 						VM_STAT(1)

NAME

     vm_stat -- show Mach virtual memory statistics

SYNOPSIS

     vm_stat [interval]

DESCRIPTION

     vm_stat displays Mach virtual memory statistics.  If the optional interval is specified, then vm_stat will display the statistics every
     interval seconds.	In this case, each line of output displays the change in each statistic (an interval count of 1 displays the values per
     second).  However, the first line of output following each banner displays the system-wide totals for each statistic.  The following values
     are displayed:
     Pages free
	     the total number of free pages in the system.
     Pages active
	     the total number of pages currently in use and pageable.
     Pages inactive
	     the total number of pages on the inactive list.
     Pages wired down
	     the total number of pages wired down.  That is, pages that cannot be paged out.
     Translation faults
	     the number of times the "vm_fault" routine has been called.
     Pages copy-on-write
	     the number of faults that caused a page to be copied (generally caused by copy-on-write faults).
     Pages zero filled
	     the total number of pages that have been zero-filled on demand.
     Pages reactivated
	     the total number of pages that have been moved from the inactive list to the active list (reactivated).
     Pageins
	     the number of requests for pages from a pager (such as the inode pager).
     Pageouts
	     the number of pages that have been paged out.

     If interval is not specified, then vm_stat displays all accumulated statistics along with the page size and the object cache performance.

Mac OS								  August 13, 1997							    Mac OS

10 More Discussions You Might Find Interesting

1. Filesystems, Disks and Memory

buffer cache information

Discussion started by: vish_shan

2. HP-UX

Buffer Cache

Discussion started by: ALTRUNVRSOFLN

3. Solaris

Unix Cache / Buffer

Discussion started by: jimthompson

4. Red Hat

buffer cache size

Discussion started by: gsr_kashyap