does olympic permits fighting?
No
Fighting in ice hockey
Fighting is strictly prohibited in European professional hockey leagues and in Olympic ice hockey. 
when are you allowed to fight in hockey The debate over allowing fighting in ice hockey games is ongoing. does it have any effect on game? Statistics indicate that fights are detrimental to teams' play, or have inconsequential benefits. were there any efforts to ban it? Yes what kind of efforts? Colin Campbell and sports journalists have articulated the idea with increasing frequency that fighting adds nothing to the sport and should be banned.
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Fighting in ice hockey [SEP] Collegiate, European, and Olympic
Eight players and both coaches were ejected, and a British record total of 404 penalty minutes were incurred during the second period. The league handed out 30 games in suspensions to four players and Steelers' coach Mike Blaisdell and a total of £8,400 in fines. Russia's Kontinental Hockey League (KHL) had a bench-clearing brawl between Vityaz Chekhov and Avangard Omsk in 2010. Officials were forced to abandon the game as there were only four players left. Thirty-three players and both teams' coaches were ejected, and a world record total of 707 penalty minutes were incurred during the game. The KHL imposed fines totaling 5.7 million rubles ($191,000), suspended seven players, and counted the game as a 5–0 defeat for both teams, with no points being awarded.