Linked by David Adams on Tue 16th Aug 2011 16:47 UTC
Linux When it comes to the fast-moving business of trading stocks, bonds and derivatives, the world's financial exchanges are finding an ally in Linux. As late as 2007, Wall Street exchanges were still largely run on Unix . . . Over the past few years however, Linux has crept into this market, showing up first in ancillary systems and then running a few core exchanges.
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UK moved to linux
by REM2000 on Tue 16th Aug 2011 19:28 UTC
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Although slightly off topic, the uk stock exchange moved to Linux from Windows as it just couldn't operate in the data intensive environment.

I think the other posters have it, it really comes down to TCO, Linux is a cheaper solution with a lot more Linux admins available. Solaris is a big iron OS and running on SPARC it's not really gonna get beaten (apart from other big iron Unix's such as AIX).

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