I have a function from the Sedgewick's book
When I compile the whole program, I always got error:
The book website does not mention this bug. Quite vague with Iterable in Java so far. Can someone help me fix the problem? Thanks in advance.
Hi,
I'm working with Mercury tools: Loadrunner, and I'm trying to monitor a unix server by rstatd, and I got next error:
Mar 4 11:25:56 sacindt rpc.rstatd: incompatible to /proc. Could not read disk_io: data
does any one have an idea about this..
regards (0 Replies)
while compiling my code with -pg option
i got the following error:
ld (prelink):
-pg incompatible with -shared; assuming -nopg
any idea to overcome this problem?
how can i use gprof profiler for a program using shared libraries? (2 Replies)
I have a Sun Sparc machine with Solaris 9 on it as oracle server. We added two patches (112233-11: SunOS 5.9:Kernel Patch and 111722-04: SunOS 5.9:MathLibrary(libm)patch). When I prepared the server for Oracle installation, I checked patch with command: $/usr/sbin/patchadd -p | grep <patch_number>.... (0 Replies)
I am new to PHP and UNIX. I am using Apache to do my testing on a Windows Vista machine.
I am getting this error when I am trying to connect to a web service. I did a search and did not see any posts that pertain to this.
Here is my function:
<?php
function TRECSend($a, $b, $c, $d,... (0 Replies)
Hi guys,
here is my code written in C and the compiler error message.
int i;
int (*a);
for (i = 1;i <= 9;i++)
a = (int *)malloc(sizeof(int) * 10);here is the error:
incompatible types when assigning to type ‘int’ from type ‘int *’I want to make a two dimensional array. I... (2 Replies)
I'm compiling an application someone gave me. It uses XLC on a Power7, running Red Hat (4? 5?). It compiles and links, but I get the following message for every .o and .exe...
xlc_r: 1501-274 (W) An incompatible level of gcc has been specified.
I've tried googling on this error, and I'll I... (2 Replies)
How to initialize an object of class say "A", with an object of type say "B".
The following code give the error message "error: conversion from âAâ to non-scalar type âBâ requested"
#include <iostream>
using namespace std;
class B;
class A{
public:
A() { cout <<"\nA()" << endl; }
... (1 Reply)
This is from a program I wrote over in 1998 that I am trying to compile on a linux machine:
void write_line (FILE *fp, int rec_no, line_rec *arec)
{
fpos_t woffset;
woffset = (rec_no - 1) * sizeof(line_rec);
fsetpos(fp,&woffset);
fwrite(arec,sizeof(line_rec),1,fp);
}On the line... (2 Replies)
Discussion started by: wbport
2 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)