Programming :: Implement User Ranking In Php With A Huge Number Of Users?
Aug 21, 2010
I'm writing a user ranking module for a site. This ranking depends on some criterias and it's possible to set or unset any one of these criterias in order to consider them in calculating the user rank or not. And here's the way I've implemented the ranking calculation :
when I set one or more of the criterias to be considered in ranking , for each user in the system I insert one record for each criteria , for example : if I have 2 criterias and both are set and consider that I have two users , I'll have :
Ranking table
--------------
username | criteria | to_be_added | score
--------------------------------------------------
user1 | criteria1 | 1 | 0
[code]....
It means I just set the to_be_added field to 1 for all of them and leave the calculation of score for each criteria for each user to the time the user logins so that to prevent doing all these calculations at once , because there are a huge number of users ... But there is one problem , if I want to show for example the best user (based on the highest score) , the result can't always be true because some users might not logged in at that time and their score might be zero .
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Feb 21, 2011
I want to count the number of users who have logged in multiple terminals ? How will I get this ? I always get the total number of users. How will I get the uniq number of users with multiple logins ?
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Sep 12, 2010
Lastb often shows me a huge list of attempted ssh logins.Such as this excerpt:
Code:
admin ssh:notty Sat Sep 11 23:47 - 23:47 (00:00) 184-154-37-12.Huge-DNS.COM
root ssh:notty Sat Sep 11 23:47 - 23:47 (00:00) 184-154-37-12.Huge-DNS.COM
[code]....
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Oct 26, 2009
I need to transfer some massive amount of data (2.5terrabyte, many files, directory structure) to a embedded raid-box which has a minimal linux on it (some custom distro from western digital). We tried rsync (version 2.6.7), but it crashes because the filelist is too big for the ram available (fixed in later versions of rsync, but I don't know how to update, it's not debian based and there are no compiler tools). We tried nfs, but the max bandwidth produced is around 1 mb/sec (cpu bound?), so it'd take around 3 weeks this way. Samba has problems with big files (and we have some 20gb files in there).
SCP isn't installed, and would probably also be cpu bound due to encryption I think. So the only option left would be ftp, we're currently trying using ncftp with the command "put -R /path/to/data/" , but it's been running for over an hour, eating up most of the ram, and not using any bandwidth. I think it is still building a file list or something. FTP already worked for a single 20gb file with acceptable bandwidth of about 12mb/sec. Does anyone know a better ftp program (for console) that can start transferring some data or at least display an estimated time for the copy-preperation?
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Nov 12, 2010
I want to implement quota per group users like this: Assume i have a Student group in my system, that student1 and student2 and student3 are three users in this group. i want to set quota 100GB per each user in this group, 100GB for student1, 100GB for student2 and .... The problem is when i set quota per group i cant say each user in that group have 100GB quota limit, also when i set quota per user, i should set one by one for each user.I want to know, is there anyway for set quota for all users in specific group?
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Feb 8, 2010
I've set up an email server as per this howto: [url]
In a nutshell, it uses a combinatio of postfix, dovecot, amavis (ClamAV and SpamAssisan) and mysql.
However, with this setup, authenticated users are able to spoof outgoing message by simple changing the "from" tag.
Does anyone have any ideas on how I could implement some address mapping to users?
In this setup, postfix users are NOT system users, by are stored in the database.
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Aug 25, 2010
how to use socket programming in order to implement chatting feature
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Mar 7, 2011
I have a partially completed interpreter that has first-calss functions and can store scopes in variables. That way it is possible to implement a simple class like this:
Code:
MyClass = func () {
value = 0;
setValue = func (x) value = x;;
[code]....
But what about inheritance, and what if I want to know the type of the object?
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Jul 28, 2010
I am doing real time programming in C++, under Linux. I have two processes, let me say A and B. A process is being started periodically, every 5ms. B process is being started every 10ms. The process A is doing data processing. The process B is reading that data and displays it. I am confused about how to run periodically processes. The problem is that the period of process A should be as much as it is possible accurate (5ms). For the process B it isn't so important. I have created independent processes, each in one .cpp file, and I am starting them from bash file. Is that OK? I don't have to make child processes in order to have parallel processes?
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Aug 11, 2010
So basically, there is a really cool writing system I have been working on. It could be viewed (for simplification purposes) like an encryption method for the Latin script.
Facts about the writing system:
It has a little over 300 symbols.
It is syllable-driven.
It is highly compositional (eg. "c", "ca", "cae", "ca " and "ci." all map to different symbols - and NOT by overlaying elements)
Symbols have medium graphical complexity (comparable to Korean Hangul, or Japanese Hiragana)
Has a rather complex set of diacritics (~10, some of which can go on any symbol)
Has no ligatures
How transliteration occurs:
Sequences of Latin symbols map to certain symbols. Example below:[G][rou][p ][hu][g.]Characters sequences between "[" and "]" map to a single symbol (so it would take only 5 symbols to write "Group hug.").
How I want it to work:
I would like to have a daemon that: Intercepts all text displayed on the screen.
Converts it to my writing system (changes letter sequences with individual Unicode codes)
Leaves unsupported symbols unchanged.
Displays all the text on the screen using my font and characters intertwined with the fonts and characters left unchanged.
For example, if you take the following line of C++ code:for (i = 1; i <= n; i++)
I would like it displayed like this:[fo][r ]([i ]= [1]; [i ]<= [n]; [i]++)
Bold-symbols should be in my Unicode font with special symbols defined for this writing system, and the rest should be in its original font and encoding. Also, I would like this encoding to hold for display-purposes only. The data in the memory should remain unaffected. This also means real-time adjustments: if I open a text editor (say, from the OpenOffice Suite) and I start typing, I would like to see what I type encoded with my writing system, even though the document actually contains Latin letters. This also means that the symbol immediately before the cursor may change as you type.
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Nov 9, 2010
I have these but not working.
size_t count_words(const std::string& s)
{
std::istringstream is(s);
return distance( std::istream_iterator<std::string>(is),
std::istream_iterator<std::string>());
}
and
std::string s; // word count
unsigned int wordno = 0;
while(getline(myfile, s))
{ ++wordno;
if(s.empty())++ wordno;
else wordno += count_words(s);
std::cout << s << '
';
}
myoutput1<< "Number of words : " << wordno << '
';
myoutput1 << "
Word" <<" " <<" Occurrence" <<endl;
myoutput2<< "Number of words : " << wordno << '
';
myoutput2 << "
Word" <<" " <<" Occurrence" <<endl;
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Feb 9, 2011
I developed a protocol "it's a modification of OLSR" for wireless networks, it was with JAVA and I try to simulate it on NS2, I used AgentJ, so in the TCL I did any thing like usual;
set val(chan) Channel/WirelessChannel ;# channel type
set val(prop)Propagation/TwoRayGround ;# radio-propagation model
set val(netif) Phy/WirelessPhy ;# network interface type
[code]....
and I didn't specified the protocol because I attached my nodes to the JAVA class responsible for the protocol, but when I run it generates errors, it claims the protocol to use, so I don't know how proceeding.
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May 14, 2011
I implemented a SSL client using openssl on Linux and it's working fine i am getting response from server...
But my problem is I have a separate thread for each request comes form front end and i have to do SSL communication in each thread, for this i have to create a separate SSL Context for each thread and this is taking too much time hence my transaction is getting delayed
My question is can we implement Persistent SSL connection where i will do SSL Handshake only at the time of application startup and use that connection in all the threads....
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Sep 3, 2010
i need to implement a Set class(like in stl) using a vector.Here is my code that doesnt work corectly:
Code:
#include <iostream>
#include <vector>
template<class T>
class Set
{
[Code]....
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Jan 7, 2011
How many users is it possible to set on Ubuntu 10.10? I have an Edubuntu LTSP system for a school (10 clients) and I wish to setup an user for each student/teacher (about 200).
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Oct 19, 2010
How can I implement c_str() for a string class?
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May 6, 2011
I have an interpteter that supports string literals, and the way it works is that the lexer returns the entire string as a single token, with the quotes removed and escape sequences replaced with the literal characters they represent.
I already implemented single-quote strings, they don't interpret any characters specially except for the single quote. I partially implemented double-quoted strings, they already support all the same backslash escape sequences that C does. But I would also want to add variable substitution.
The way it would work is that "${expression}" would interpret the expression (which could just be a variable name) and replace itself with the result. But I have no idea how to do this.
In case it matters, I'm using a hand-written lexer and recursive-descent parser.
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Oct 11, 2010
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Mar 20, 2009
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Jul 2, 2010
I'd like to implement a dynamic menu which will allow me to specify an IP address and read it into memory. This is what I've got so far (it's fairly basic...)
Code:
IPS=`ifconfig -a | grep 'inet addr:' | awk '{print $2}' | tr -d "addr:"`
PS3='Select an option and press Enter: '
select i in $IPS
do
case $i in
$i) echo $IPS;;
esac
done
echo $IPS
At the moment it just says "Which IP would you like to use" and then freezes, most success I've had is it showing all the IP's listed in ifconfig and then showing the same menu.
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Jan 17, 2010
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Sep 25, 2010
I wish to implement some part of my codes to use the GPU of my graphic card but I have no idea whether GNU as already implemented it (as for OpenMP). I mean, there are PGI Fortran compiler which embedded CUDA but I figure it's not free. I also wonder if that works only with ATI graphic cards or if for instance I can use my Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller.
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Oct 25, 2010
Just noticed this, when I am logged into OpenSuse 11.3 under my default user (autologin) I have 3 of the same user logged in, eg when I run top it shows 3 users and when I run the users command it shows the same user 3 times. Is there any reason for this? Do I need to investigate this at all?
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Mar 13, 2010
I have a huge file which has 450G. Its format is as below
x1 50020 A 1
x1 50021 B 8
x1 50022 C 9
[code]....
Now, I want to extract a subset from this file. In this subset, column 1 is x10, column 2 is from 600000 to 30000000. I wrote the following perl script but it doesn't work:
#!/usr/bin/perl
$file1 = $ARGV[0]; # Input file
$file2 = $ARGV[1]; # Output file
[code]...
I guess the input file and output file are both too big that my script can't handle it.
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Aug 1, 2011
i would like to implement dhcpctl in a program to manipulate dhcp leases. It doesn't work and there are errors at compilation :
/tmp/ccYPRIt5.o: In function `LeaseCleaning(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
pxe.cpp.text+0x133a): undefined reference to `dhcpctl_initialize()'
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[Code]...
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Jul 21, 2010
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[code]...
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Aug 1, 2010
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Jun 21, 2010
I am in deeply need of queue (linear data structure) in shell script. How can I implement this ??
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Jun 29, 2010
I'm running 64-bit 10.04, upgraded from 9.10. The problem I am experiencing is that any user accounts aside from my main account are problematic. This includes any accounts I add, as well as the GDM guest session.The specific problems that I have thus far experienced are as follows:
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Jun 29, 2009
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@"Domain Users" hard nproc 40
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