Maybe $_ in the inner loop is causing locking? Test with 
for (1..7235617){
    for my $i (1..100000){    
       $tmp = $_;
    }
}

[download]

In reply to Re: Solaris + UltraSparc T2 + Threads: Avoid LCK's by Anonymous Monk
in thread Solaris + UltraSparc T2 + Threads: Avoid LCK's by gulden

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