Drift

finding speed of device movement

由 杀马特。学长 韩版系。学妹 提交于 2020-01-07 02:44:08
问题 I need to find velocity of a device(Samsung Galaxy s3). I've now read quite a lot of stackoverflow questions concerning it, but still confused as for what I should use. My observations so far: 1) Somebody did this to find velocity from accelerometer sensor's data. But in my case the device's movement will not have constant slope or straight trajectory. 2) Integration will give much drift. 3) Kalman filtering can be used but it's hard to implement and CPU consuming 4) Complementary filter can

C# timer that fires every X seconds, but stays in synch with real time (i.e. with no drift)

由 别等时光非礼了梦想. 提交于 2019-12-12 08:04:36
问题 Is there a .NET Timer available in C# that can ensure there is no "drift" in between events? That is, if you set the timer to go off every X seconds, that after days of operating it won't drift, i.e. to ensure that approach number of X seconds events in a day remains in synch with what it should be? If not, is there a well known code example that would wrap a Timer function in C# to do this? 回答1: sorry for only giving you a link to quartz.net, but this is a fully qualified, enterprise, tested

How to deal with the amazon ec2's clock drift?

由 社会主义新天地 提交于 2019-12-10 01:04:39
问题 We have a couple of ec2 instances on amazon, and we used amazon AIM Linux to set up. The instance type is m1.medium. Everything is going well until this week. We found from log file that there would be a huge clock drift happened suddenly, and sometimes there has a 5-minutes discrepancy。 I would like to ask if anyone else encounter this problem? How to deal with it? 回答1: Time drift can occur due to over utilization of your instances resources. I would encourage you to check you cloudwatch CPU

How to deal with the amazon ec2's clock drift?

由 天大地大妈咪最大 提交于 2019-12-05 01:01:30
We have a couple of ec2 instances on amazon, and we used amazon AIM Linux to set up. The instance type is m1.medium. Everything is going well until this week. We found from log file that there would be a huge clock drift happened suddenly, and sometimes there has a 5-minutes discrepancy。 I would like to ask if anyone else encounter this problem? How to deal with it? Time drift can occur due to over utilization of your instances resources. I would encourage you to check you cloudwatch CPU graphs to try identify if your CPU was being over utilized. If you are running amazon linux AMI, NTP is

ntpserver配置

由 戏子无情 提交于 2019-12-04 08:58:59
# For more information about this file, see the man pages # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5). driftfile /var/lib/ntp/drift # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system. restrict default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery # Permit all access over the loopback interface. This could # be tightened as well, but to do so would effect some of # the administrative functions. restrict 127.0.0.1 restrict -6 ::1 # Hosts on

C# timer that fires every X seconds, but stays in synch with real time (i.e. with no drift)

由 不想你离开。 提交于 2019-12-03 13:47:56
Is there a .NET Timer available in C# that can ensure there is no "drift" in between events? That is, if you set the timer to go off every X seconds, that after days of operating it won't drift, i.e. to ensure that approach number of X seconds events in a day remains in synch with what it should be? If not, is there a well known code example that would wrap a Timer function in C# to do this? sorry for only giving you a link to quartz.net , but this is a fully qualified, enterprise, tested, ... library ... you don't need to reinvent the wheel :) if you worry about overhead, what is your

PMM出问题排查

由 孤街醉人 提交于 2019-11-29 00:22:09
PMM出问题排查 2017-09-29 阅读量259 看各种日志 monitoring service 1 2 3 4 [root@node4 ~]# ll /var/log/pmm-* -rw-r--r--. 1 root root 1880 Sep 27 18:02 /var/log/pmm-linux-metrics-42000.log -rw-r--r--. 1 root root 783 Sep 27 18:02 /var/log/pmm-mysql-metrics-42002.log -rw-r--r--. 1 root root 7143 Sep 27 18:08 /var/log/pmm-mysql-queries-0.log docker里的日志 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 [root@node4 log]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e4916410b314 percona/pmm-server:latest "/opt/entrypoint.sh" 2 hours ago Up 31 minutes 0.0.0.0:80->80/tcp, 443/tcp pmm-server 948a9aeb047e

ntpserver配置

由 ぐ巨炮叔叔 提交于 2019-11-26 10:16:57
# For more information about this file, see the man pages # ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5). driftfile /var/lib/ntp/drift # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system. restrict default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery # Permit all access over the loopback interface. This could # be tightened as well, but to do so would effect some of # the administrative functions. restrict 127.0.0.1 restrict -6 ::1 # Hosts on
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