02-10-2012
Yes, the only time you really want to drop caches (all right, the one time I can think of right now) is if you are testing disk read performance for comparison. Then you do want to drop caches so as to make the tests equal.
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
hi,
What is the difference between UBC cache and Metadata cache ? where can i find UBC cache Hits and Metadata cache Hits in hp-ux?
Advanced thanx for the help. (2 Replies)
Discussion started by: sushaga
2 Replies
2. UNIX for Advanced & Expert Users
i have a serious doubht about the assignment of memory
in hp-ux system .
i read from somewhere that the page allocation in
hp-ux is not unified unlike compaq .
i wanted to know in hp-ux kernel ,once the pages are
assigned for the univarsal buffer cache... (2 Replies)
Discussion started by: vish_shan
2 Replies
3. HP-UX
What is the "Buffer Cache" used for? (1 Reply)
Discussion started by: ALTRUNVRSOFLN
1 Replies
4. Solaris
Dear all,
We are testing two of our servers for mq series connectivity. The scenario is, when one machine is shutting down it's services there are some scripts that do a dns update, which removes the ip address and relates it to the ip address of the other node on our dns server, and the update... (7 Replies)
Discussion started by: earlysame55
7 Replies
5. Linux
Hi all
I am trying to understand the kernel memory management and require assistance in this regard. Kernel first creates the cache memory to perform any subsequent allocation to processes. I could not figure out how it is accomplished. Do kernel directly allocates any hardware cache or allocates... (0 Replies)
Discussion started by: joshighanshyam
0 Replies
6. Programming
Hello,
I need help on how to "access" or manipulate the Linux ARP Cache in C, here is the description of the project i'm working in:
There are a lot of tools that analize ARP frames and send an e-mail to the sysadmin, that's easy. What i want to do is to inspect every ARP frame that arrives... (18 Replies)
Discussion started by: semash!
18 Replies
7. Linux
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... (2 Replies)
Discussion started by: manustone
2 Replies
8. UNIX for Advanced & Expert Users
18:45:47 # free -m
total used free shared buffers cached
Mem: 96679 95909 770 0 1530 19550
-/+ buffers/cache: 74828 21851
Swap: 12287 652 11635
Hi all. The below output is from a RHEL 4.5... (0 Replies)
Discussion started by: drummerrob
0 Replies
9. 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 (0 Replies)
Discussion started by: hmanish
0 Replies
10. UNIX for Dummies Questions & Answers
i wish to clear memory cache on a production box and i was wondering what is the worst that can happen if i do?
i already tested this on a backup server and everything seemed fine.
but i need to know from you experts what are the worst things that can happen when i run it on a real server:
... (5 Replies)
Discussion started by: SkySmart
5 Replies
LEARN ABOUT DEBIAN
captest
CAPTEST:(8) System Administration Utilities CAPTEST:(8)
NAME
captest - a program to demonstrate capabilities
SYNOPSIS
captest [ --drop-all | --drop-caps | --id ] [ --lock ] [ --text ]
DESCRIPTION
captest is a program that demonstrates and prints out the current process capabilities. Each option prints the same report. It will output
current capabilities. then it will try to access /etc/shadow directly to show if that can be done. Then it creates a child process that
attempts to read /etc/shadow and outputs the results of that. Then it outputs the capabilities that a child process would have.
You can also apply file system capabilities to this program to study how they work. For example, filecap /usr/bin/captest chown. Then run
captest as a normal user. Another interesting test is to make captest suid root so that you can see what the interaction is between root's
credentials and capabilities. For example, chmod 4755 /usr/bin/captest. When run as a normal user, the program will see if privilege esca-
lation is possible. But do not leave this app setuid root after you are don testing so that an attacker cannot take advantage of it.
OPTIONS
--drop-all
This drops all capabilities and clears the bounding set.
--drop-caps
This drops just traditional capabilities.
--id This changes to uid and gid 99, drops supplemental groups, and clears the bounding set.
--text This option outputs the effective capabilities in text rather than numerically.
--lock This prevents the ability for child processes to regain privileges if the uid is 0.
SEE ALSO
filecap(8), capabilities(7)
AUTHOR
Steve Grubb
Red Hat June 2009 CAPTEST:(8)