Date: Sat, 02 Aug 1997 02:14:44 -0400 From: "Gary Palmer" <gpalmer@freebsd.org> To: hackers@freebsd.org Subject: non-blocking file i/o Message-ID: <7776.870502484@orion.webspan.net>
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A friend (who mainly does his devel under solaris/linux) recently came up with a patch to the INN database code which made the writes non-blocking. On linux/solaris, the non-blocking writes would take fractions of a ms. On FreeBSD, the blocking write took 8ms and the ``non-blocking'' write took 4ms (set using fcntl). It also seems that Linux and Solaris use open(file, O_NONBLOCK, 0) to put the file into non-blocking mode for reading and writing also, where our open flag only affects the open. O_NONBLOCK seems nearly a no-op on FreeBSD. Is this true? Is there anything that can be done about it? (just as a test, the mmap'd version on a FreeBSD PPro came out with pretty similar figures to the Linux one on similar h/w ... it's just non-blocking writes that seem troublesome). The reason that a non-blocking writes one could be attractive is that the .pag file is bloated a lot, and could be a lot of trouble on smaller machines ... Thanks, Gary -- Gary Palmer FreeBSD Core Team Member FreeBSD: Turning PC's into workstations. See http://www.FreeBSD.ORG/ for info
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