Dear Monks,

I have a very big input file of around 5590600 MB size and while opening the file and reading the file it is taking 99 or 100% utilisation of my CPU. But I am trying to reduce the CPU utilisation to less than 50% and not able to succeed with that. In the execution of "top" command in command prompt first it says CPU usage: 28.2% but in the detailed PID it says 100% usage. So not sure if it is really taking 100% or only 28%.If it is taking only 28% of overall 100% CPU then it is fine. Else could you please let me know how to reduce the cpu time to less than 50%

tie @lines, 'Tie::File', "testfile.dat" or die "Can't read file: $!\n"
+;
$linecount = $#lines+1;
#print "Linecount=> $linecount\n";
foreach ( @lines )
{
       chomp;
        ($type, $No, $date) = split(/\|/);
        $hash{$No.$date} = $type."@".$No."@".$date;
}
untie @lines;
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PROCESS TIME
Processes: 135 total, 4 running, 6 stuck, 125 sleeping, 926 threads   
+                                                                     
+                                                                     
+                                                     21:13:58
Load Avg: 1.22, 1.17, 1.07  CPU usage: 28.2% user, 3.32% sys, 68.64% i
+dle   SharedLibs: 10M resident, 9736K data, 0B linkedit. MemRegions: 
+28168 total, 2921M resident, 76M private, 568M shared. PhysMem: 1056M
+ wired, 3782M active, 971M inactive, 5810M used, 2380M free.
VM: 318G vsize, 1054M framework vsize, 248025(0) pageins, 0(0) pageout
+s. Networks: packets: 453919/88M in, 393620/58M out. Disks: 65480/378
+2M read, 137948/7081M written.

PID     COMMAND           %CPU  TIME      #TH   #WQ   #PORT #MREGS RPR
+VT   RSHRD   RSIZE   VPRVT   VSIZE   PGRP   PPID   STATE     UID   FA
+ULTS    COW      MSGSENT     MSGRECV     SYSBSD     SYSMACH     CSW  
+     PAGEINS KPRVT   KSHRD   USER
perl5.12          99.9  00:08.58  1/1   0     22    56+    99M+    124
+4K
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