Hi am very new to unix.I got installed linux mandrake and the first problem is whith the modem i don't know why but it does not work. i config it on /dev/modem
and some time it says
"the modem is bussy"
and some time it says:
"Modem ready"
but the modem did'n switch on
Ok the other question... (3 Replies)
sir
i am trying to compile and execute cpp file in unix
the command cpp <filename > is not working
do you suggest any other command?
thanking you (5 Replies)
gcc help iam using kubuntu os (www.ubuntu.com) in that i dont find gcc but cpp command is there how to compile code with that
& how to use gij for java in ubuntu (1 Reply)
I'm trying to develop a script that makes it so only .cpp programs can print. I'm doing it for my computer programming class because everyone keeps printing the executable instead of the source code and it's wasting a lot of paper. How can I accomplish this? Thanks for the help. :D (5 Replies)
Installed GNU make and the GNU C/C++ compiler on SCO Openserver 5.0.7 recently.
Only a normal user is able to run make and compile programs - root is not able to.
Under root, make do run, but root can't access the compiler at all, even tho I set root's path to point to the compiler.... (0 Replies)
I need to find all the methods in a cpp file ... using shell script
Pls guide me regarding the grep criteria for searching methods
I mean what are the patterns to be grepped in *.cpp which match methods
Hope i have made myself clear
Thanks and Regards
-- Ultimatix (2 Replies)
In a program if we call exit(0), it exits the program and before that it closes all opened stream.
In C++, it even does destroys the created objects. Is there any function available, which if called will do some basic clean ups (which includes object destruction) ??? (4 Replies)
I have an error in my logs as it shows some function name .
1. I dnt know where is the file.cpp located only i know the machine .
2. How to find out that the function name is loacated in which path and which file into that machine.
Thanks . (1 Reply)
Discussion started by: madfox
1 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)