Hi there,
I am very new to UNIX. Currently, I am running Mac OS X. I set up a FTP server on my computer so that I can transfer files back and forth between my computer at home and at work. All my data and files are located in a directory in another drive, but when I log in, I would be in my... (3 Replies)
Hi
I'm getting
ld: fatal: option -h and building a dynamic executable are incompatible
ld: fatal: Flags processing errors
When I run
ld -shared -L/usr/dt/lib -lDtSvc -o builtin.so Workspace.o
after running
gcc -fPIC -I/usr/X11R6/include -I/usr/dt/include -c Workspace.c
I'm... (6 Replies)
Forgive as I am new to the gcc compiler and to linux. I am trying to compile/link a program for the first time and am receiving an error complaining about the crtbegin.o file. I use the -v option and get the following:
Using built-in specs.
Configured with: ../configure --enable-threads=posix... (1 Reply)
at the end of the compilation in solaris 9. it is showing link error.
like.....
ld: fatal: library -lgthread-2.0 not found
failed to create the binary
the library is in /usr/lib and in /usr/local/lib the lib file is present
--->libgthread.2.0.so ......etc
if i remove... (3 Replies)
hello,
Is the code compiled under Visual Age C++ Broker (a third party library) - can be used to link against a code compiled from gcc compiler.
I have a problem in building xerces in AIX
Please reply.
Regards,
Parthasarathy (1 Reply)
I use Solaris 10, compiling with a custom g++ (3.4.6) and GNU binutils (2.17). Things have gone well on two different systems, but when I tried moving to a third, it all fell over. Basically, it is now using the CC linker, but I need to use options not available to it. I believe I have found the... (0 Replies)
Hi!
We recently updated the server (server is a big word, it's really just a desktop with Ubuntu that we access with ssh) on which we compile our code. Since the update my code won't compile. The linker is complaining about missing references from almost all .so that I'm linking from. It... (0 Replies)
I have a C binary file(.so as extension) which is delivered by a product.
How do i use this functionalities of this .so file in my C program?
How can in link the .so to my C program? (1 Reply)
Discussion started by: vkca
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)