will mmap use user cpu instead of whole sys cpu? (solaris)

Posted by Daniel on Stack Overflow See other posts from Stack Overflow or by Daniel
Published on 2009-05-08T12:55:30Z Indexed on 2010/03/19 9:21 UTC
Read the original article Hit count: 282

Filed under:

mmap

|

user

|

cpu

|

solaris

when use mmap to allocate some anonymous mem, we often set the start address as 0/null so mmap will figure out the starting address by itself. And to get the start address, it will work thought the whole virtual memory space to find a hole which could put the chuck of mem to be allocated. I guess this is calculated as user cpu instead of sys cpu. If the virtual memory is fragmented, then the time to find the starting address will use more user cpu, is my understanding correct

© Stack Overflow or respective owner

Related posts about mmap

ls -l freezes terminal locally and remotely

as seen on Server Fault - Search for 'Server Fault'
I've been reading other SF threads regarding ls not returning results or freezing and stalling terminal sessions and it appears they usually the fault of network problems. My problem however, occurs both over remote SSH sessions but also if I am physically at the server itself... I just installed… >>> More
PHP script keeps doing mmap/munmap

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, My PHP script contains a loop, which does nothing much more than echoing and dereferencing pointers (like in $tab[$othertab[$i]]- stuff). It was working great until yesterday, when this script starting being VERY slow (like 50 times slower than before). After using strace, i figured out… >>> More
Shell command slow when using pipe, fast with intermediate file

as seen on Server Fault - Search for 'Server Fault'
Does anyone understand this huge difference in processing time, when using an intermediate file, or when using a pipe? I'm converting tiff to pdf using standard tools on a fresh debian squeeze server. A standard way of doing this is to convert to ps first. Without pipe: root@web5:~# time tiff2ps… >>> More
Caching in mmap

as seen on Stack Overflow - Search for 'Stack Overflow'
I am using mmap call to read from a very big file using simple pointer arithmetic in C++. The problem is that when I read small chunks of data (in the order of KBs) multiple times, each read take the same amount of time as the previous one. How can I know if the disk is being accessed to fulfill my… >>> More
alignment and granularity of mmap

as seen on Stack Overflow - Search for 'Stack Overflow'
I am confused by the specification of mmap. Let pa be the return address of mmap (the same as the specification) pa = mmap(addr, len, prot, flags, fildes, off); In my opinion after the function call succeed the following range is valid [ pa, pa+len ) My question is whether the range of… >>> More

Related posts about user

blocking bad bots with robots.txt in 2012 [closed]

as seen on Pro Webmasters - Search for 'Pro Webmasters'
does it still work good? I have this: # Generated using http://solidshellsecurity.com services # Begin block Bad-Robots from robots.txt User-agent: asterias Disallow:/ User-agent: BackDoorBot/1.0 Disallow:/ User-agent: Black Hole Disallow:/ User-agent: BlowFish/1.0 Disallow:/ User-agent: BotALot Disallow:/ User-agent:… >>> More
Redirect network logs from syslog to another file

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I keep logging way to much info (not needed, for now) in my syslog, and not daily or hourly... but instant. If I want to watch for something in my syslog I just can't because the network log keeps interfering. So, how can I redirect network logs to another file and/or stop logging it? Dec 10 17:01:33… >>> More
polkit: disable all users except those in group wheel?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
Is it possible to do the following using 1 polkit .pkla file? Disable all users except those in the wheel group from using polkit. The users in the wheel group will need to provide the root password when using polkit. /etc/polkit-1/localauthority/50-local.d/wheel-only.pkla [disable all users… >>> More
More efficent way to do this?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a if function that works out how much of a users profile is completed however the way I include below was the best I could think of, however it seems really inefficient. What is the better way to do this? if($user['first_name']!==""&&$user['last_name']!==""&&$user['pemail']… >>> More
PHP If/Else - More efficent way to do this?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a if function that works out how much of a users profile is completed however the way I include below was the best I could think of, however it seems really inefficient. What is the better way to do this? if($user['first_name']!==""&&$user['last_name']!==""&&$user['pemail']… >>> More