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The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.
Location of the "O(1) scheduler" (a process scheduler) in a simplified structure of the Linux kernel. An O(1) scheduler (pronounced "O of 1 scheduler", "Big O of 1 scheduler", or "constant time scheduler") is a kernel scheduling design that can schedule processes within a constant amount of time, regardless of how many processes are running on the operating system.
sync is a standard system call in the Unix operating system, which commits all data from the kernel filesystem buffers to non-volatile storage, i.e., data which has been scheduled for writing via low-level I/O system calls. Higher-level I/O layers such as stdio may maintain separate buffers of their own.
Windows, OS X, Linux, Android, iPhone, Palm webOS: Yes: Yes: Yes: Zetta.net: Windows, OS X, Linux: No: Yes: Yes: Yes: Yes: Yes: Yes: Yes, Preserve file name case & file metadata: Yes: Yes Name Operating system Freeware version Portable Encrypts files Detect conflict File lock Open file support Revision control Detect rename Detect move Full ...
Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks.Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates.
The Precision Time Protocol (PTP) is a protocol for clock synchronization throughout a computer network with relatively high precision and therefore potentially high accuracy. In a local area network (LAN), accuracy can be sub-microsecond – making it suitable for measurement and control systems. [ 1 ]
North American Time Synchronization Sources Time Signal Time Provided Accuracy Source Signal Format Hardware Requirements Linux/Unix Software Windows Software GPS: UTC(USNO) 1575.42 MHz: NMEA 0183 sentences, 1PPS signal.
PTPd accuracy depends on how IEEE 1588 packets are timestamped on the participating machines. When IEEE 1588 packets are timestamped in software, interrupt latency, OS scheduling, and other software issues reduce the accuracy of the acquired timestamps, and therefore, the accuracy of time synchronization.