Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Improve the performance of my C++ code
Top Forums Programming Improve the performance of my C++ code Post 302931883 by Lauris_k on Friday 16th of January 2015 06:13:50 AM
Old 01-16-2015
I would agree to achenles 1(Corona688) and 3 points.


On top of that I would just use simple dynamic array with pointer to next element, something like :
Code:
typedef struct _sList _sList;
struct _sList{
    _sList    *next;
    int       SEQ_size;
    SEQ       *element;
};

when reading elements from file on complete element just start comparing SEQ_size from start of list, until point where element_size from file equals or smaller to element in list, then in case of smaller - add element to list (unique one). If equal memcmp(list_elemen, file_element, SEQ_size) until list element is greater, equal or SEQ_size of file element is greater, if equal delete - its equal, if greater add to list before greater element.
P.S. this is case when sorting from small to big.

This way you will fast forward to elements of same length, and then will compare only until you will find equal element or storing spot.

In the end you will have sorted list of unique elements.

Need even faster then make more difficult structures from which you could build graph(data tree). In this area only your imagination and content of element will stop from optimizing even more. Usually more complex structures will pay off when having bigger amount of data.
This User Gave Thanks to Lauris_k For This Post:
yifangt
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

improve performance by using ls better than find

Hi , i'm searching for files over many Aix servers with rsh command using this request : find /dir1 -name '*.' -exec ls {} \; and then count them with "wc" but i would improve this search because it's too long and replace directly find with ls command but "ls *. " doesn't work. and... (3 Replies)
Discussion started by: Nicol
3 Replies

2. Shell Programming and Scripting

How to improve grep performance...

Hi All, I am using grep command to find string "abc" in one file . content of file is *********** abc = xyz def= lmn ************ i have given the below mentioned command to redirect the output to tmp file grep abc file | sort -u | awk '{print #3}' > out_file Then i am searching... (2 Replies)
Discussion started by: pooga17
2 Replies

3. UNIX for Dummies Questions & Answers

Improve Performance

hi someone tell me which ways i can improve disk I/O and system process performance.kindly refer some commands so i can do it on my test machine.thanks, Mazhar (2 Replies)
Discussion started by: mazhar99
2 Replies

4. Shell Programming and Scripting

Any way to improve performance of this script

I have a data file of 2 gig I need to do all these, but its taking hours, any where i can improve performance, thanks a lot #!/usr/bin/ksh echo TIMESTAMP="$(date +'_%y-%m-%d.%H-%M-%S')" function showHelp { cat << EOF >&2 syntax extreme.sh FILENAME Specify filename to parse EOF... (3 Replies)
Discussion started by: sirababu
3 Replies

5. Shell Programming and Scripting

Improve the performance of a shell script

Hi Friends, I wrote the below shell script to generate a report on alert messages recieved on a day. But i for processing around 4500 lines (alerts) the script is taking aorund 30 minutes to process. Please help me to make it faster and improve the performace of the script. i would be very... (10 Replies)
Discussion started by: apsprabhu
10 Replies

6. Shell Programming and Scripting

Want to improve the performance of script

Hi All, I have written a script as follows which is taking lot of time in executing/searching only 3500 records taken as input from one file in log file of 12 GB Approximately. Working of script is read the csv file as an input having 2 arguments which are transaction_id,mobile_number and search... (6 Replies)
Discussion started by: poweroflinux
6 Replies

7. Shell Programming and Scripting

How to improve the performance of parsers in Perl?

Hi, I have around one lakh records. I have used XML for the creation of the data. I have used these 2 Perl modules. use XML::DOM; use XML::LibXML; The data will loo like this and most it is textual entries. <eid>19000</eid> <einfo>This is the ..........</einfo> ......... (3 Replies)
Discussion started by: vanitham
3 Replies

8. Programming

Help with improve the performance of grep

Input file: #content_1 12314345345 242467 #content_14 436677645 576577657 #content_100 3425546 56 #content_12 243254546 1232454 . . Reference file: content_100 (1 Reply)
Discussion started by: cpp_beginner
1 Replies

9. Shell Programming and Scripting

Improve performance of echo |awk

Hi, I have a script which looks like this. Input file data1^20 data2^30 #!/bin/sh file"/home/Test.txt" while read line do echo $line |awk 'BEGIN { FS = "^" } ; { print $2 }' echo $line |awk 'BEGIN { FS = "^" } ; { print $1 }' | gzip | wc -c done <"$file" How can i... (4 Replies)
Discussion started by: chetan.c
4 Replies

10. UNIX for Dummies Questions & Answers

How to improve the performance of this script?

Hi , i wrote a script to convert dates to the formate i want .it works fine but the conversion is tkaing lot of time . Can some one help me tweek this script #!/bin/bash file=$1 ofile=$2 cp $file $ofile mydates=$(grep -Po '+/+/+' $ofile) # gets 8/1/13 mydates=$(echo "$mydates" | sort |... (5 Replies)
Discussion started by: vikatakavi
5 Replies

LEARN ABOUT DEBIAN

ansi_code

term::ansi::code(3tcl)						 Terminal control					    term::ansi::code(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       term::ansi::code - Helper for control sequences

SYNOPSIS

       package require Tcl  8.4

       package require term::ansi::code  ?0.1?

       ::term::ansi::code::esc str

       ::term::ansi::code::escb str

       ::term::ansi::code::define name escape code

       ::term::ansi::code::const name code

_________________________________________________________________

DESCRIPTION

       This package provides commands enabling the definition of control sequences in an easy manner.

       ::term::ansi::code::esc str
	      This command returns the argument string, prefixed with the ANSI escape character, "33."

       ::term::ansi::code::escb str
	      This command returns the argument string, prefixed with a common ANSI escape sequence, "33[".

       ::term::ansi::code::define name escape code
	      This  command defines a procedure name which returns the control sequence code, beginning with the specified escape sequence, either
	      esc, or escb.

       ::term::ansi::code::const name code
	      This command defines a procedure name which returns the control sequence code.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category term	of
       the  Tcllib  SF	Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

KEYWORDS

       control, declare, define, terminal

CATEGORY

       Terminal control

COPYRIGHT

       Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>

term									0.1						    term::ansi::code(3tcl)
All times are GMT -4. The time now is 08:29 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy