Not that I know PERL much, but Benchmark - perldoc.perl.org says:
cmpthese - print results of timethese as a comparison chart
and:
I suggest the first form with no & and in single quotes.
HI,
I tried these but could not get the results.
I have to identify the sub routine which is taking a lot of time.
But i am unable to trace which part of the sub routine.
If u can help me out with this that would be really great.
I want to replace a Perl module name in all my Perl Scripts in the cgi-bin directory. How is it possible?
I have the following statement in my scripts
use myUtil;
I want to change it to
use myUtil777;
Regards,
Rahul (2 Replies)
Hi,
Can anybody provide me Pointers to Practice tests or any Material to prepare for Brainbench certification in Unix Shell Scripting? Also how good is this Certification for UNIX programmers. Is it worth it? I'm planning to take this certification in 2 weeks. Kindly let me know all the pros... (0 Replies)
Hi All,
I am using a perl module Win32::AdminMisc in my perl script.
When i running in activestate perl v5.10.0 it shows folling error ---
Can't locate loadable object for module Win32::AdminMisc in @INC (@INC contains: C:/Perl/site/lib C:/Perl/lib .) at example.pl
Please reply.
... (7 Replies)
I dont know if this is a dumb question, but I am unable to move ahead and need help -
There is a perl module called Header.pm which was written by someone else. I am trying to write a simple perl script which uses a function provided by the module. The function has been exported by the module... (9 Replies)
Hi,
Please help me!!
Im wondering if anyone can help me with a problem i have with some perl modules.
My problem is:
I'm trying to connect remote host to a unix box from a windows machine. So i'm developing an application to do this.
I'm programming it in perl with tcl/tk Gui interface.... (13 Replies)
Hi,
I need to read an excel binary file and write the data to a text file. Is it possible using Spreadsheet-ParseExcel-0.58 ? If not, is there any module available in CPAN to do this?
Thanks,
Js (1 Reply)
All,
Is it possible to call a subroutine from the perl expect module after logging to a system that is within the same program. My situation is I need to run a logic inside a machine that I'm logging in using the expect module, the logic is also available in the same expect program.
Thanks,... (5 Replies)
I'm trying to create a perl script that will do 1 SSH session, but be able to write multiple commands to the session and receive multiple outputs. I know there are modules out there like Net:SSH::Perl, but I'm not allowed to use it. I was thinking of doing something like an open3 on an ssh... (4 Replies)
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Discussion started by: ramkumar15
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)