you could read all the .log files like this below code

opendir(hand,$ARGV[0]);  #replace ARGV[0] with your DIR
    @files = readdir(hand);
    closedir(hand);

    foreach(@files){
        if(/\.log$/i) {                                               
+      #if the filename has .log at the end
            push(@logfiles,$_);  
        }
    }
[download]

you could then take the logfiles array and do a multithreaded processing like below

while (scalar @Threads < scalar @logfiles) {
        @running = threads->list(threads::running);
    
        if (scalar @running < $n_process) {                           
+         #spawn threads if no of running threads less that MAX proces
+ses defined
            $filename = $logfiles[$fileindex];
            my $thread = threads->new( sub { sorterwriter($filename) }
+);                    #spawning worker threads passing filename to su
+broutine     
            push (@Threads, $thread);                                 
+   #pushing no of threads spawned for checking in outer loop
            my $tid = $thread->tid;
            print "  - starting thread $tid\n";
            $fileindex++;
        }
        
    }
[download]

or you could do regular processing by

$nooffiles = @logfiles;
$fileindex=0;
while ($fileindex <$nooffiles )
{
open hanr ,">", "$logfiles[$fileindex]" or die "could not open logfile
+ .. $!";
$fileindex++;
}
[download]