675
OS market share in Top 500 supercomputers
(feddit.org)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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A supercomputer running Windows HPC Server 2008 actually ranked 23 in TOP500 in June 2008.
I always forget that Windows Server even exists, because the name is so stupid. "windows" should mean "gui ~~interface~~ to os."
edit: fixed redundacy.
But Windows Server has GUI. Although a server having GUI (not webui, desktop) is kinda stupid
The GUI is optional these days, and there's plenty of Windows servers that don't use it. The recommended administration approach these days is PowerShell remoting, often over SSH now that Windows has a native SSH server bundled (based on OpenSSH).
I'd say having a GUI is not inherently stupid. The stupid part is, if I understand it correctly, the GUI being a required component and the primary access method.