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Widgets for websites and blogs ProRealTime Reviews. Follow us on Twitter. The market always supports two non-profits. This year they will also be supporting Boxer Rescue Canada. Thirty-three per cent are children under the age of 15, and another 12 per cent are seniors on a fixed income.
The Central Okanagan Food Bank also wishes to remind the community that as we head into the growing season, fresh donations of produce are always welcome, but need to be dropped off directly to the Kelowna Enterprise Way or West Kelowna Churchill Road Branch.
The Rotary Clubs involved in this community Food Drive include: April 26, Brian Martin and Betty Selin broadcasted live from Village Green Centre, while individuals, businesses and community groups rose to the challenge, donating funds and event proceeds to support our kids at VJH. This dedicated room will support children and their families undergoing chemotherapy treatment at Vernon Jubilee Hospital.
A Vernon gym is celebrating their one year anniversary and with that, the owners have decided to host a fundraiser. The Kindale Developmental Association supports people with disabilities, their families and their communities. For every membership signed during the week of April 20 to May 5, 9Round Vernon will donate 50 per cent of the first month to Kindale Developmental Association.
However, the kernel can only go partway toward achieving this goal on its own. Interrupt-driven clocks are not perfect, and timers are subject to thermal drift. Threads are subject to preemption. Time therefore drifts; those tiny parts-per-million errors add up. The clock must be set to the correct time from an external reference at startup, and then errors corrected as they accumulate. This is where third-party timekeeping programs enter the picture.
A timekeeping program needs to check with external sources periodically, and correct any drift that occurs within the computer. PTPv2 sync packets typically arrive once per second, giving the timekeeper the chance to tweak the system's rate that often, if needed. In order to provide some real-life numbers to illustrate the timekeeping abilities of Windows, I've sampled several of our own production machines and reproduced the results in several tables below.
Measurements are expressed as the delta in microseconds each machine calculates between its own current time and the correct time, as provided by a two-step PTPv2 appliance driven by GPS.
PTPv2 was set up using the default End-to-End profile, sending one sync packet per second. We collected one sample per second, and summarized a minute's worth 60 samples for each machine. Our convention is to use positive numbers to show how much the machine must speed up, and negative to show how much it must slow down. The choice of what to call positive or negative is arbitrary, as long as an equal but opposite change in rate is used to steer the clock.
Note the number of significant digits: This demonstrates that a busy Hyper-V host is less stable than an idle one.
Hyper-V gives priority to keeping stable time on the guests, on the assumption that the host partition's job is simply ensuring that the guests run.
But even so, the host's worst delta was Microsoft's best practices guidelines suggest that a Hyper-V host should do nothing more arduous than running guests. To test Microsoft's guidelines, we examined one of the guests on the busy host.
This particular VM is a busy web server. Even so, it shows no deltas greater than These numbers demonstrate that the guests do indeed keep time better than the host partition when the machine is busy.
All of the above examples so far are taken from Hyper-V machines, either host or guest. Non-virtualized machines perform much better. We tested with Windows 10 to demonstrate the difference. The worst delta is only 5. The average delta was 2. It will perform at this level, with few if any spikes, even when heavily loaded. Increasing the PTPv2 sync frequency beyond the default of one per second can improve syntonization, since the machine will have less time to drift before a change in clock rate can be implemented.
The point of diminishing returns for Windows appears to be four sync packets per second; beyond that, the machine spends too much time processing packets and insufficient time steering the clock - remember that a change in rate must be held across at least one hardware interrupt in order to affect the computer's accumulation of elapsed time. PTPv2 even helps the problematic Windows platforms.
A non-virtualized Windows 7 machine, fully loaded and busy my own workstation, used while writing this article , averaged Bear in mind that the problematic Windows platforms Vista through R2 will show more outliers. The same machine, during a four-hour period, had nearly same average delta Even without the assistance of a kernel-based interpolator, Windows 7 or R2, which uses the same kernel , does a good job of staying within tolerable levels of precision timekeeping as long as it can synchronize with a local PTPv2 appliance.
Windows Server, currently in pre-release v3, is Microsoft's newest operating system. It breaks with tradition somewhat: In prior releases of Windows, client and server versions shared identical kernel code, differing only in features, GUI, and performance tuning.
Fortunately for this discussion, the timekeeping parts of the kernel are shared, and Windows performs exactly like Windows Because the machine is a VM, it doesn't fare as well as the Windows 10 machine shown above.
But still, an average of Table 01 summarizes expectations for timekeeping on Windows. These numbers represent average performance, as measured in our labs over a period of days with varying loads.