By Noel Randewich SAN FRANCISCO (Reuters) - The longevity of the technology stocks rally is on the line next week as Netflix Inc (NFLX.O) kicks off the earnings season for a sector that has mushroomed to account for more than a fifth of the U.S. stock market's value. Surges in Apple (AAPL.O), Facebook (FB.O) and other Silicon Valley heavyweights have pushed the S&P 500 technology index 10 percent higher this year, more than double the broader S&P 500 index's 4 percent gain. The tech sector's aggregate value now tops $4.4 trillion, 30 percent higher than No. 2 financials, and even rivals the size of the Federal Reserve's massive balance sheet. The next test for these companies is whether their profit growth is sufficient to justify their outsized share price gains. Enter Netflix, which reports after the bell on Monday. The video streaming pioneer is expected by analysts to quintuple its earnings per share.