3 volt output inverter in the PPS line from the GPS. If you are using a different GPS device from those mentioned here you may need to a 3. Gary E Miller reports that the pps-gpio driver only looks for one edge, the positive going edge. Note that there is no value given for the “clear” time.
・ブート後に実行はされるがすぐに停止して常駐しないサービス (ntpdate とか)
あるいは、(1)ではサービス名が表示されない物もあるので、どのサービスがどんなステータス出力をするのか知っておく必要もありますね。(service network statusとか).
There is a model-B (shown and used below), and a lower-spec model-A which may become available at some time in the future. I bought an attractive blue case and 5 V, 2 A power-supply from ModMyPi. I’m using the 512 MB model-B, introduced in Autumn 2012. The Raspberry Pi is a credit-card size computer, available from distributors across the world. You can see the Ethernet lead on the left, and the 4 GB SD card with the operating system on the right, together with the micro-USB power lead.
Or install openntpd from ports, which is much simpler and in my opinion works a lot better then the native ntpd daemon. No need to worry about stratum or anything else like that, just point it at a ntp server and let it go. However do use ntpdate to set the time and date on boot, to always have a good clock to .
For the minimum offset, I made NTP poll the local servers at 32 (2^^5) second intervals, and did not allow that to drift upwards towards the 1024 seconds maximum interval that NTP would reach left to its own devices. My own LAN has three stratum-1 NTP servers, one on FreeBSD and two running Windows, so I added those before the pool servers. I removed things which had been commented out to simplify the file, and make it easier to understand. I did this with the minpoll and maxpoll qualifiers. Of course, this is specific to my LAN. Conf ended up as follows:. Hence my ntp. However, I did not want to force the Internet servers to be interrogated that often (it is considered at best impolite, and at worst could get you blocked from a server), so I therefore made the minimum polling interval for the Internet servers 1024 seconds (2^^10).
The network requirements for this option are at least one 1 Gigabit Ethernet access network and one 10 Gigabit Ethernet storage network. All data and processes are located on the same server and can be accessed locally. It is possible to run an SAP HANA system entirely on one host and then scale the system up as needed. An SAP HANA scale-up system on a single server is the simplest of the installation types.
I actually didn’t connect the TXD lead to the GPS module in the first instance, as the GPS receiver powers up sending data in the correct format, so there is nothing which the computer needs to control. 3 V signals are required, not the 5 V level, and definitely not the RS-232 level. Again, please note that 3. There is a description of the GPIO pin header here.
Later, it was noticed that the offset was varying periodically, and this is an unexpected result. More detailed examination of the loopstats data shows an actual period of just over 100 seconds, and it’s being aliased by the 5-minute sampling of MRTG. Below is a sample from 2012 Dec 19-21, with the less stable period staring at the end of 2012-Dec-19 and finishing at the end of Dec 20.
1, dynamically linked (uses shared libs), FreeBSD-style, stripped. Conf: ASCII English text
/bin/cp: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD), for FreeBSD 7. Прочитать несколько байт файла и определить тип файла:
The FreeBSD upgrade from 8. Freebsd-update upgrade -r 9. Conf – This is a.
На примере нагляднее:
chmod 777 /tmp/file. Если надо дать права всем файлам в папке и всему содержимому включая подпапки(рекурсивно), надо использовать параметр -R, т. :
chmod -R 766 /tmp/. Sh -разрешить читать, изменять, выполнять файл file. Для установления прав доступа используется команда CHMOD. Sh всем
chmod 766 /tmp/file. Sh -разрешить себе читать, изменять, выполнять файл file. Sh, а группе и всем остальным только читать, изменять.
From my NTPplotter program graphs below, you can see more clearly that at 13:30 the user-mode PPS was started, and the just after 18:00 the minpoll was changed from 1 (actually 3) to 4, resulting in a slight drop of RMS offset from around 5 microseconds to 4 microseconds:.