A Second Before Us Game
Angeles Bartholomew
Companies are struggling to gather and prepare data before they can even use it. They are unable to capitalize on data's potential to engage with customers. Onesecondbefore's mission is to turn these companies into leaders in the data field instead of staying behind. We provide direct access to a state-of-the-art data science environment, so that you can stay in control of your own data. It enables you to predict the future with algorithms developed by the world's leading data scientists. It turns predictions into actions, so that you don't lose out on potential business opportunities.
Despite the -U option, it doesn't actually output packets immediately. Instead, they're saved up and output almost exactly once per second, the only exception being that if I cause a lot of network activity, they'll be output more often. I also tried the -l option, it makes no difference. Using a smaller buffer (the -B argument) makes it so that less traffic can cause more frequent output, but the smallest possible is 128 which is still large enough that the traffic I want to see is only output once per second.
Yes - when tcpdump opens a device for capturing with pcap_open_live() or with pcap_create() and pcap_activate(), it specifies a timeout of 1 second. This means that, on many OSes (including Linux distributions with newer versions of the kernel and of libpcap, as well as *BSD, OS X, and Solaris), the kernel will buffer up packets until either its buffer fills up or 1 second has elapsed, and will deliver the entire buffer of packets, for efficiency.
On computers I tell people to wait for all fans to stop spinning. It's a fair compromise. This 30-second advice is much more relevant to a non-computer (simpler, bigger capacitors) device. We know that the complex parts of a computer will be reset upon power cycling them, regardless of any random capacitors.
I am not sure about current hardware but older generations of DRAM relied on capacitors that took up to 5 to 10 seconds to completely discharge. also some early switching power supplies could be damaged by inrush current if they had not completely discharged. Depending on the power supply again up to 15 seconds was needed. SO why tell everyone 30 seconds? Because all of you are impatient and don't follow instructions.
That is why waiting 30 seconds/till the machine is cold/till all light are off work in certain cases. This also the reason why sometimes it actually works if you kick or hit a PC/TV or turn it upside down/certain angle.
I was a tech support rep for Gateway 2000 back when that name still seemed futuristic. They had a two week training course for tech support reps back then, which was pretty comprehensive. I remember the instructor saying that among the reasons above, another reason to let a computer sit for 30 seconds had something to do with viruses that could push themselves in to VRAM and then be activated after a quick reboot where a full power off and 5 second wait would make sure the VRAM was clear.
When I have phoned support for a broadband connection I've been asked to reboot my router and wait 10 or 30 seconds (I forget how many) to make sure that the modem(s) I was connecting to in the telephone exchange had properly disconnected my router.
The IBM PC and PC/XT had this annoying feature. If you turned the power off and then on too quickly, nothing would happen. This was even more frustrating for people since there wasn't a power or on/off light to look at... you know you did it wrong because after a minute or so the computer hadn't done anything. Hence the common 30 second rule for rebooting.
He told me that in "ze good ol'days", car would sometimes fail to start if you directly turn the key to start engine and that even if they does start now, it is still better for the engine to wait a few seconds.
The only type of vehicle you need wait on is a diesel powered one. The reason for that is you need to wait (in most of them) for the glow plugs to heat the combustion chamber. Modern fuel injected cars will keep their fuel pressure after shutdown. It will stay there (usually) for a good 24 hours (Note: 24 hours is an approximation. It will take longer in some cars and less time in others for the fuel pressure to bleed off back into the fuel tank). When you turn the key on, the fuel pump will start running. This happens as fast as you turn the key. Oil doesn't start flowing until the engine is actually running, so if you tried to wait for that, you'd be waiting a lot longer than three seconds.
Bottom line, I guess is this: it doesn't hurt anything to wait the three seconds, but you aren't creating any issues by not waiting. There will be no long term effects from starting it right after key insertion.
I used to do this with my Ford Fiesta and Puma - it's all about fuel. When the ignition key is turned on, the fuel pump runs for a few seconds, then shuts off. This ensures there is enough fuel pressure in the rail to start (since a richer mixture is required to start when cold). The Puma did not like me turning the key straight to START without waiting for the pump to run; it would cough a few times and stall. Letting the pump add pressure would ensure a perfect start each time. The smaller Fiesta engine (same series as the Puma) didn't seem to mind starting straight from OFF.
As @Paulster2 noted, modern fuel-injected cars maintain pressure at the rail for a long time, both making starting quicker, and maintenance more time-consuming! Most current injection systems do not return unused fuel to the tank, so the pump will only run to bring the pressure up to operation. My general rule is that, if you turn the ignition ON and there's a soft buzzing noise, wait for that to shut off before starting the engine. If it doesn't, you can start it without waiting. My 1985 Supra only runs the fuel pump when the key is turned to START (and once the engine is confirmed running) so there is no need to wait at ON for anything to happen before cranking the engine.
On my 1998 Sable I had some problems starting when it was very cold. I dreaded this very cold snap (low single digits) would be a pain as last year I had to jump my car twice when the temps were in the teens. Someone suggested to wait in the on position a few seconds. For me it was a godsend, I don't care about why, I just know it worked.
Objectives: To assess the prevalence of mental disorders during the second wave of COVID-19 pandemic in comparison with both, baseline and the first wave of the pandemic, and to identify disproportionally affected non-clinical subgroups.
Material and methods: We used data from three nationally representative cross-sectional studies and compared the prevalence of current mood and anxiety disorders, and alcohol-use disorders at baseline (November 2017, n = 3306), immediately after the first peak (May 2020, n = 3021), and during the second peak (November 2020, n = 3000) of COVID-19 in Czechia. We used the Mini International Neuropsychiatric Interview (M.I.N.I.) as a screening instrument, and calculated weighted prevalence (%) with 95% weighted confidence intervals (95% CIs). Additionally, we examined the prevalence of these disorders across different non-clinical population sub-groups during the second wave of the pandemic.
Results: The proportion of individuals experiencing at least one mental disorder was highest during the second wave of the pandemic (32.94%, 95% CI = 31.14%; 34.77%), when compared to both the baseline in November 2017 (20.02%, 95% CI = 18.64%; 21.39%), and the first wave in May 2020 (29.63%, 95% CI = 27.9%; 31.37%). Younger adults, students, those having lost a job or on forced leave, and those with only elementary education displayed disproportionally high prevalence of mental disorders.
The second ranking could be very easy for the College Football Playoff selection committee after its top eight teams all won in Week 10. It's not always that simple, though, when the committee "begins each week with a blank sheet of paper" and "what happened last year does not matter."
That's why the back-to-back defending national champs weren't the committee's No. 1 team in its initial ranking. Was No. 2 Georgia's win against No. 12 Mizzou enough to change that in the committee's second of six rankings, unveiled at 7 p.m. ET Tuesday night on ESPN?
Washington's pedestrian performances in wins against Arizona State (2-7) and Stanford (3-6) are why the committee put the Huskies at No. 5 in its first ranking. While it was another offensive clinic for Washington against USC, the defense allowed at least 30 points for the second straight week. None of the undefeated teams above Washington lost, so if the Huskies move up, it would be because of the road win against a ranked CFP team.
If LSU is the committee's top three-loss team as expected, where does Notre Dame (7-3) land? Ohio State should have a top-10 win against Penn State, but how will the committee value its close road win against the Irish? The Irish are No. 22 in strength of record metric, the second highest ranking of any three-loss team behind LSU.
The International Earth Rotation and Reference Systems (IERS) recently announced that an extra second will be injected into civil time at the end of June 30th, 2015. This means that the last minute of June 30th, 2015 will have 61 seconds. If a clock is synchronized to the standard civil time, it should show an extra second 23:59:60 on that day between 23:59:59 and 00:00:00. This extra second is called a leap second. There have been 25 such leap seconds since 1972. The last one took place on June 30th, 2012.
If you want to know whether your applications and systems can properly handle the leap second, contact your providers. If you run time-sensitive workloads and need to know how AWS clocks will behave, read this document carefully. In general, there are three affected parts:
AWS Management Console and Backend Systems
The AWS Management Console and backend systems will NOT implement the leap second. Instead, we will spread the one extra second over a 24-hour period surrounding the leap second by making each second slightly longer. During these 24 hours, AWS clocks may be up to 0.5 second behind or ahead of the standard civil time (see the AWS Adjusted Time section for more information).