Are the BSDs dying? Post: 303012227

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The Lounge What is on Your Mind? Are the BSDs dying? Post 303012227 by Neo on Wednesday 31st of January 2018 11:15:49 PM

02-01-2018

Administrator

There is nothing "dead" about BSD. BSD lives in the heart and soul of MacOS, and MacOS is a very popular computer operating system. All software changes over time, and BSD is no exception and BSD changed the heart of the MacOS forever:

Reference:

BSD Overview

Quote:

BSD Overview

The BSD portion of the OS X kernel is derived primarily from FreeBSD, a version of 4.4BSD that offers advanced networking, performance, security, and compatibility features. BSD variants in general are derived (sometimes indirectly) from 4.4BSD-Lite Release 2 from the Computer Systems Research Group (CSRG) at the University of California at Berkeley. BSD provides many advanced features, including the following:

Preemptive multitasking with dynamic priority adjustment. Smooth and fair sharing of the computer between applications and users is ensured, even under the heaviest of loads.

Multiuser access. Many people can use an OS X system simultaneously for a variety of things. This means, for example, that system peripherals such as printers and disk drives are properly shared between all users on the system or the network and that individual resource limits can be placed on users or groups of users, protecting critical system resources from overuse.

Strong TCP/IP networking with support for industry standards such as SLIP, PPP, and NFS. OS X can interoperate easily with other systems as well as act as an enterprise server, providing vital functions such as NFS (remote file access) and email services, or Internet services such as HTTP, FTP, routing, and firewall (security) services.
Memory protection. Applications cannot interfere with each other. One application crashing does not affect others in any way.

Virtual memory and dynamic memory allocation. Applications with large appetites for memory are satisfied while still maintaining interactive response to users. With the virtual memory system in OS X, each application has access to its own 4 GB memory address space; this should satisfy even the most memory-hungry applications.
Support for kernel threads based on Mach threads. User-level threading packages are implemented on top of kernel threads. Each kernel thread is an independently scheduled entity. When a thread from a user process blocks in a system call, other threads from the same process can continue to execute on that or other processors. By default, a process in the conventional sense has one thread, the main thread. A user process can use the POSIX thread API to create other user threads.

SMP support. Support is included for computers with multiple CPUs.

Source code. Developers gain the greatest degree of control over the BSD programming environment because source is included.

Many of the POSIX APIs.

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LEARN ABOUT NETBSD

schedctl

SCHEDCTL(8)						    BSD System Manager's Manual 					       SCHEDCTL(8)

NAME

     schedctl -- control scheduling of processes and threads

SYNOPSIS

     schedctl [-A cpus] [-C class] [-P pri] [-t lid] -p pid | command

DESCRIPTION

     The schedctl command can be used to control the scheduling of processes and threads.  It also returns information about the current schedul-
     ing parameters of the process or thread.  Only the super-user may change the scheduling parameters.  schedctl can also be used to start a new
     command using the specified parameters.

     Available options:

     -A cpus	Set of the processors on which process or thread should run, that is, affinity.  Processors are defined as numbers (starting from
		zero) and separated by commas.	A value of -1 is used to unset the affinity.

     -C class	Scheduling class (policy), one of:

		SCHED_OTHER   Time-sharing (TS) scheduling policy.  The default policy in NetBSD.

		SCHED_FIFO    First in, first out (FIFO) scheduling policy.

		SCHED_RR      Round-robin scheduling policy.

     -P pri	Priority for the process or thread.  Value should be in the range from SCHED_PRI_MIN (0) to SCHED_PRI_MAX (63).  Setting of prior-
		ity for the process or thread running at SCHED_OTHER policy is not allowed.

     -p pid	The target process which will be affected.  If the process has more than one thread, all of them will be affected.

		If -p is not given, a command to execute must be given on the command line.

     -t lid	Thread in the specified process.  If specified, only this thread in the process will be affected.  May only be specified if -p is
		also given.

EXAMPLES

     Show scheduling information about the process whose ID is ``123'':

	   # schedctl -p 123

     Set the affinity to CPU 0 and CPU 1, policy to SCHED_RR, and priority to 63 for thread whose ID is ``1'' in process whose ID is ``123'':

	   # schedctl -p 123 -t 1 -A 0,1 -C SCHED_RR -P 63

     Run the top(1) command with real-time priority:

	   # schedctl -C SCHED_FIFO top

SEE ALSO

     nice(1), getpriority(2), setpriority(2), psrset(8), renice(8)

HISTORY

     The schedctl command first appeared in NetBSD 5.0.

BSD
								  March 21, 2011							       BSD