FreeBSD src
32766cd281
Auto-tuning threshold discussions aside, it turns out that if you want to lower this on say, rather memory-packed machines, you either set maxusers or kern.maxfiles, or you set it in sysctl. The former is a non-exact way to tune this; the latter doesn't actually affect anything in the startup scripts. This first occured because I wondered why the hell screen would take upwards of 10 seconds to spawn a new screen. I then found python doing the same thing during fork/exec of child processes - it calls close() on each FD up to the current openfiles limit. On a 1TB machine this is like, 26 million FDs per process. Ugh. So: * This allows it to be set early in /boot/loader.conf; * It can be used to work around the ridiculous situation of screen, python, etc doing a close() on potentially millions of FDs even though you only have four open. Tested: * 4GB, 32GB, 64GB, 128GB, 384GB, 1TB systems with autotune, ensuring screen and python forking doesn't result in some pretty hilariously bad behaviour. TODO: * Note that the default login.conf sets openfiles-cur to unlimited, effectively obeying kern.maxfilesperproc. Perhaps we should fix this. * .. and even if we do, we need to also ensure that daemons get a soft limit of something reasonable and capped - they can request more FDs themselves. MFC after: 1 week Sponsored by: Norse Corp, Inc. |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| games | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| ObsoleteFiles.inc | ||
| README | ||
| UPDATING | ||
This is the top level of the FreeBSD source directory. This file was last revised on: $FreeBSD$ For copyright information, please see the file COPYRIGHT in this directory (additional copyright information also exists for some sources in this tree - please see the specific source directories for more information). The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7) and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html for more information, including setting make(1) variables. The `buildkernel` and `installkernel` targets build and install the kernel and the modules (see below). Please see the top of the Makefile in this directory for more information on the standard build targets and compile-time flags. Building a kernel is a somewhat more involved process. See build(7), config(8), and http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information. Note: If you want to build and install the kernel with the `buildkernel` and `installkernel` targets, you might need to build world before. More information is available in the handbook. The kernel configuration files reside in the sys/<arch>/conf sub-directory. GENERIC is the default configuration used in release builds. NOTES contains entries and documentation for all possible devices, not just those commonly used. Source Roadmap: --------------- bin System/user commands. cddl Various commands and libraries under the Common Development and Distribution License. contrib Packages contributed by 3rd parties. crypto Cryptography stuff (see crypto/README). etc Template files for /etc. games Amusements. gnu Various commands and libraries under the GNU Public License. Please see gnu/COPYING* for more information. include System include files. kerberos5 Kerberos5 (Heimdal) package. lib System libraries. libexec System daemons. release Release building Makefile & associated tools. rescue Build system for statically linked /rescue utilities. sbin System commands. secure Cryptographic libraries and commands. share Shared resources. sys Kernel sources. tests Regression tests which can be run by Kyua. See tests/README for additional information. tools Utilities for regression testing and miscellaneous tasks. usr.bin User commands. usr.sbin System administration commands. For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/synching.html