Oil up 4 percent as OPEC meets, volatility hits post-Doha high

By Barani Krishnan and Amanda Cooper NEW YORK/LONDON (Reuters) - Oil jumped nearly 4 percent on Monday as the world's largest producers gathered in Algeria to discuss ways to support prices, with nervous trade driving volatility to its highest since a similar meeting to freeze output in April in Doha which failed. The Organisation of the Petroleum Exporting Countries and other exporters led by No. 1 producer Russia are meeting informally on the sidelines of the International Energy Forum in Alge