Perl, Python, Ruby, PHP, C, C++, Lua, tcl, javascript and Java benchmark/comparison.

Only core language functionality has been used for testing.

Originally I wanted to compare only mainstream cross platform interpreting languages - namely PHP, Perl5, Python, Ruby and Java (Sun's and OpenJDK). Then curiosity made me include C, C++, Javascript ("spidermonkey", Mozilla), Javascript ("V8", Webkit), tcl, Lua and Java GCJ.

Whilst it is interesting to compare languages to each other, Javascripts, tcl and Lua are falling outside of scope so I will not compare their features.
Technically C and C++ should not belong here because they are very different from interpreting languages by nature, however their results are important to match against.

Defaults has been used for all languages but PHP. By default PHP restrict maximum memory usage and maximum execution time. In order to complete test those parameters had to be changed in PHP runtime configuration.

Compilation time needed for C, C++ and Java wasn't counted in this testing.

This comparison consists of three parts:
Part 1: Speed.
Part 2: Memory usage.
Part 3: Language features.

Speed

Execution speed is obviously important to understand the language. I would say that if you're not considering performance at all you simply don't care about your application. However performance alone is not the most important characteristic and therefore other aspects should be taken into consideration as well.

Speed tests fall into 4 categories:

Slowest: Java gcj (native executable)

Slow: Java (openJDK); Java (Sun); Lua

Not-so-fast: tcl; Javascript (spidermonkey)

Fastest: Python; Ruby; PHP; C++; Javascript V8; C; Perl5

Memory usage

During testing memory usage were captured as per every completed step.

Result fall into five categories:

Highest: Java OpenJDK, Java Sun

High:Java GCJ

Medium:Javascript V8, Javascript sm., PHP

Low:tcl, Lua, Ruby

Lowest: Python, Perl5, C++, C

Source codes and test results

C; Result: C gcc (Debian 4.4.4-1) 4.4.4

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int main(){

setbuf(stdout,NULL); //disable output buffering

char *str=malloc(8);
strcpy(str,"abcdefgh");

str=realloc(str,strlen(str)+8);
strcat(str,"efghefgh");     //sprintf(str,"%s%s",str,"efghefgh");

int imax=1024/strlen(str)*1024*4;

printf("%s","exec.tm.sec\tstr.length\n"); //fflush(stdout);

time_t starttime=time(NULL);
char *gstr=malloc(0);
int i=0;
char *pos;
int lngth;

char *pos_c=gstr;
int str_len=strlen(str);

    while(i++ < imax+1000){
        lngth=strlen(str)*i;
        gstr=realloc(gstr,lngth+str_len);
        strcat(gstr,str);    //sprintf(gstr,"%s%s",gstr,str);
        pos_c+=str_len;

        pos=gstr;
        while(pos=strstr(pos,"efgh")){
            memcpy(pos,"____",4);
        }

        if(lngth % (1024*256)==0){
            printf("%dsec\t\t%dkb\n",time(NULL)-starttime,lngth/1024); //fflush(stdout);
        }
    }
//printf("%s\n",gstr);

}

C++ (source); Result: C++ g++ (Debian 4.4.3-7) 4.4.3

#include <iostream>
#include <string>
#include <time.h>

using namespace std;

main ()
{
  string str = "abcdefgh";
    str += "efghefgh";
  int imax = 1024 /str.length() * 1024 *4;
  time_t currentTime = time(NULL);
  cout << "exec.tm.sec\tstr.length" << endl;

  string find= "efgh";
  string replace ="____";
  string gstr;
  int i=0;
  int length;
//  int end=0; //  size_t end=0;

  while(i++ < imax +1000){
    gstr += str;
    gstr = gstr;
    size_t start, sizeSearch=find.size(), end=0;

    while((start=gstr.find(find,end))!=string::npos){
        end=start+sizeSearch;
        gstr.replace(start,sizeSearch,replace);
    }
    length = str.length()*i;
    if((length%(1024 * 256))==0){
        cout << time(NULL) - currentTime << "sec\t\t" << length/1024 << "kb" <<  endl;
    }
  }
// cout << gstr << endl;

return 0;
}

Javascript (source); Results: Javascript (Spidermonkey - Mozilla) 1.8.0 pre-release 1 2007-10-03, Javascript (V8 - Chrome)

#!/usr/local/bin/js

var str = "abcdefgh"+"efghefgh";
var imax = 1024 / str.length * 1024 * 4;

var time = new Date();
print("exec.tm.sec\tstr.length");

var gstr = "";
var i=0;
var lngth;

while (i++ < imax+1000) {
    gstr += str;
    gstr = gstr.replace(/efgh/g, "____");
        lngth=str.length*i;
        if ((lngth % (1024*256)) == 0) {
                var curdate=new Date();
                print(parseInt(((curdate.getTime()-time.getTime())/1000))+"sec\t\t"+lngth/1024+"kb");
        }
}

Java (source); Results: Java (OpenJDK) "1.6.0_18", Java (Sun) "1.6.0_16", Java (gcj) (Debian 4.4.3-1) 4.4.3

public class java_test {

    public static final void main(String[] args) throws Exception {
        String str = "abcdefgh"+"efghefgh";
        int imax = 1024 / str.length() * 1024 * 4;

        long time = System.currentTimeMillis();
        System.out.println("exec.tm.sec\tstr.length\tallocated memory:free memory:memory used");
        Runtime runtime = Runtime.getRuntime();
        System.out.println("0\t\t0\t\t"+runtime.totalMemory()/1024 +":"+ runtime.freeMemory()/1024+":"+(runtime.totalMemory()-runtime.freeMemory())/1024);

        String gstr = "";
        int i=0;
        int lngth;

        while (i++ < imax+1000) {
            gstr += str;
            gstr = gstr.replaceAll("efgh", "____");
            lngth=str.length()*i;
                if ((lngth % (1024*256)) == 0) {
                        System.out.println(((System.currentTimeMillis()-time)/1000)+"sec\t\t"+lngth/1024+"kb\t\t"+runtime.totalMemory()/1024+":"+runtime.freeMemory()/1024+":"+(runtime.totalMemory()-runtime.freeMemory())/1024);
                }
        }
    }
}

Perl5 (source); Result: This is perl, v5.10.1 (*) built for i486-linux-gnu-thread-multi

#!/usr/bin/perl
$|=1;    #disable output buffering, this is necessary for proper output through pipe

my $str='abcdefgh'.'efghefgh';
my $imax=1024/length($str)*1024*4;               # 4mb

my $starttime=time();
print "exec.tm.sec\tstr.length\n";

my $gstr='';
my $i=0;

while($i++ < $imax+1000){   #adding 1000 iterations to delay exit. This will allow to capture memory usage on last step

        $gstr.=$str;
        $gstr=~s/efgh/____/g;
        my $lngth=length($str)*$i;   ##     my $lngth=length($gstr);        # Perhaps that would be a slower way
        print time()-$starttime,"sec\t\t",$lngth/1024,"kb\n" unless $lngth % (1024*256); #print out every 256kb
}

PHP (source); Result: PHP 5.3.1-5 with Suhosin-Patch (cgi-fcgi) (built: Feb 22 2010 17:38:41)

<?php


$str="abcdefgh"."efghefgh";
$imax=1024/strlen($str)*1024*4;      # 4mb

$starttime=time();
print("exec.tm.sec\tstr.length\n");

$gstr='';
$i=0;

while($i++ < $imax+1000){

        $gstr.=$str;
        $gstr=preg_replace('/efgh/','____',$gstr);
        $lngth=strlen($str)*$i;
        if($lngth % (1024*256)==0){
                print (time()-$starttime."sec\t\t".($lngth/1024)."kb\n");
        }
}

?>

Python (source); Result: Python 2.5.5

#!/usr/bin/python -u
import re
import time
import sys

str='abcdefgh'+'efghefgh'
imax=1024/len(str)*1024*4   # 4mb

starttime=time.time();
print "exec.tm.sec\tstr.length"
sys.stdout.flush()

gstr=''
i=0

while (i < imax+1000):
        i=i+1
        gstr+=str
        gstr=re.sub('efgh','____',gstr)
        lngth=len(str)*i
        if(lngth % (1024*256) == 0):
                print int(time.time()-starttime),"sec\t\t",(lngth/1024),"kb"
                sys.stdout.flush()

Python3 (source); Result: Python 3.1.3

#!/usr/bin/python3 -u
import re
import time
import sys

str='abcdefgh'+'efghefgh'
imax=1024/len(str)*1024*4   # 4mb

starttime=time.time();
print "exec.tm.sec\tstr.length"
sys.stdout.flush()

gstr=''
i=0

while (i < imax+1000):
        i=i+1
        gstr+=str
        gstr=re.sub('efgh','____',gstr)
        lngth=len(str)*i
        if(lngth % (1024*256) == 0):
                print int(time.time()-starttime),"sec\t\t",(lngth/1024),"kb"
                sys.stdout.flush()

Ruby (source); Result: ruby 1.8.7 (2010-01-10 patchlevel 249) [i486-linux]

#!/usr/bin/ruby
$stdout.sync=true;

str='abcdefgh'+'efghefgh';
imax=1024/str.length*1024*4;       # 4mb

starttime=Time.new;
print("exec.tm.sec\tstr.length\n");

gstr='';
i=0;

while i < imax+1000
        i=i+1;
        gstr+=str;
        gstr=gstr.gsub(/efgh/, "____")

        lngth=str.length*i;
        if(lngth % (1024*256)==0)
                print(((Time.new-starttime).ceil).to_s+"sec\t\t",(lngth/1024).to_s,"kb\n");
        end
end

#puts gstr;

Lua (source): Result: Lua 5.1.4

#!/usr/bin/lua

io.stdout:setvbuf "no";             --  io.flush();

str='abcdefgh'..'efghefgh';
imax=1024/string.len(str)*1024*4;         -- 4mb

starttime=os.time();
print "exec.tm.sec\tstr.length";

gstr='';
i=0;

while i < imax+1000 do
        i=i+1;
        gstr=gstr..str;
        gstr=string.gsub(gstr,"efgh","____");
        lngth=string.len(str)*i;
        if(math.mod(lngth,1024*256)==0) then
                print(os.time()-starttime.."sec\t\t"..(lngth/1024).."kb");
        end
end

tcl (source): Result: tcl 8.4.19

#!/usr/bin/tclsh

set str "abcdefgh"
append str "efghefgh"

set imax [expr {1024/[string length $str]*1024*4}]

set starttime [clock clicks -milliseconds]
puts "exec.tm.sec\tstr.length";

set gstr ""
set i 0

while {$i<[expr {$imax+1000}]} {
        incr i
        append gstr $str;
        regsub -all {efgh} $gstr ____ gstr
        set lngth [expr {[string length $str]*$i}]
        if {[expr {$lngth % (1024*256)}] == 0} {
                puts "[expr int([expr [clock clicks -milliseconds] - $starttime] / 1000)]sec\t\t[expr {$lngth/1024}]kb"
        }
}

exit

ERROR: Could not connect to lockdownd, error code -5

Spend several hours trying to figure this out but with no luck. I reinstalled (libimobiledevice - 1.2.0) from the source (including libplist-1.12, ifuse-1.1.3 and libusbmuxd-1.1.0). I have no parental restrictions on the device and no screen lock. The device will not mount through Mac and returns the same errors.

First try with below steps for resolution.

1) Go to /var/db folder using terminal.
2) You can see "lockdown" folder.
3) Please delete lockdown folder either manually or by this command "rm -rf lockdown"
4) Create new folder using cmd "sudo mkdir lockdown".
5)  try this "sudo chown _usbmuxd lockdown"
6) Unplug and plug the iphone cable and trust this device in iphone and system.

It will solve the problem.

If above solution is not working then please try below steps. this steps will resolve this error permanently.

The issue appears to be with the version of libimobiledevice available via homebrew (currently 1.2.0). The simplest workaround until a new release is cut is likely to install from head:

1) brew uninstall libimobiledevice

2) brew install --HEAD libimobiledevice

This solution might work 100% to resolve this problem.