How to Generate an Accurate Timer Tick
in [VB.NET]
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From: Charles on 20 May 2010 09:51 I asked a question related to this a little while ago, and thought that I'd got my answer, but it has come back to bite me again. I currently use a System.Threading.Timer to generate a tick every 10 seconds. At each tick, I execute some code that will take a maximum of 5 seconds to complete. Most of the time, each subsequent tick occurs at exactly 10 seconds after the previous one, but occasionally there can be as much as 20 or 30 seconds between ticks. It was explained, in the previous thread, that the Threading timer relies on WM_TIMER messages, which are low down on the priority list. If the system gets a bit busy then these message seem to come further apart, so my tick interval extends. What I need is a reliable way to generate a 10 second tick, that still works when the system gets a bit busy. I'm running this on Windows Server 2003 R2 x64, if that makes any difference. Does anyone have any ideas? TIA Charles
From: Family Tree Mike on 20 May 2010 11:57 On 5/20/2010 9:51 AM, Charles wrote: > I asked a question related to this a little while ago, and thought that > I'd got my answer, but it has come back to bite me again. > > I currently use a System.Threading.Timer to generate a tick every 10 > seconds. At each tick, I execute some code that will take a maximum of 5 > seconds to complete. Most of the time, each subsequent tick occurs at > exactly 10 seconds after the previous one, but occasionally there can be > as much as 20 or 30 seconds between ticks. > > It was explained, in the previous thread, that the Threading timer > relies on WM_TIMER messages, which are low down on the priority list. If > the system gets a bit busy then these message seem to come further > apart, so my tick interval extends. > > What I need is a reliable way to generate a 10 second tick, that still > works when the system gets a bit busy. I'm running this on Windows > Server 2003 R2 x64, if that makes any difference. > > Does anyone have any ideas? > > TIA > > Charles > > To get exactly 10 seconds between ticks, you need a real-time operating system. Windows is not a real-time OS. You will need to rethink the requirement, or rethink the computing platform. -- Mike
From: Davej on 20 May 2010 12:18 On May 20, 8:51 am, "Charles" <bl...(a)nowhere.com> wrote: > [...] Most of the time, each subsequent tick occurs at > exactly 10 seconds after the previous one, but occasionally > there can be as much as 20 or 30 seconds between ticks. > You've looked here? http://msdn.microsoft.com/en-us/library/system.timers.timer.aspx
From: Charles on 20 May 2010 14:58 Hi Mike Thanks for the reply. To be honest, I'd be happy with 10 seconds +/- 5 seconds, which doesn't seem to much to ask. Or is it? Charles "Family Tree Mike" <FamilyTreeMike(a)ThisOldHouse.com> wrote in message news:#NQkzUD#KHA.5464(a)TK2MSFTNGP05.phx.gbl... > On 5/20/2010 9:51 AM, Charles wrote: >> I asked a question related to this a little while ago, and thought that >> I'd got my answer, but it has come back to bite me again. >> >> I currently use a System.Threading.Timer to generate a tick every 10 >> seconds. At each tick, I execute some code that will take a maximum of 5 >> seconds to complete. Most of the time, each subsequent tick occurs at >> exactly 10 seconds after the previous one, but occasionally there can be >> as much as 20 or 30 seconds between ticks. >> >> It was explained, in the previous thread, that the Threading timer >> relies on WM_TIMER messages, which are low down on the priority list. If >> the system gets a bit busy then these message seem to come further >> apart, so my tick interval extends. >> >> What I need is a reliable way to generate a 10 second tick, that still >> works when the system gets a bit busy. I'm running this on Windows >> Server 2003 R2 x64, if that makes any difference. >> >> Does anyone have any ideas? >> >> TIA >> >> Charles >> >> > > To get exactly 10 seconds between ticks, you need a real-time operating > system. Windows is not a real-time OS. You will need to rethink the > requirement, or rethink the computing platform. > > -- > Mike
From: Charles on 20 May 2010 15:02 Hi Dave Yes, I have. It was my understanding that the Timers timer was just a wrapper for the Threading timer. Perhaps not. There doesn't seem to be anything there that suggests it is any more reliable the the threading version. If it doesn't use WM_TIMER messages, do you know how it does work? Thanks Charles "Davej" <galt_57(a)hotmail.com> wrote in message news:a38d2fce-5230-42bd-833c-e9b6748bf691(a)h37g2000pra.googlegroups.com... > On May 20, 8:51 am, "Charles" <bl...(a)nowhere.com> wrote: >> [...] Most of the time, each subsequent tick occurs at >> exactly 10 seconds after the previous one, but occasionally >> there can be as much as 20 or 30 seconds between ticks. >> > > You've looked here? > > http://msdn.microsoft.com/en-us/library/system.timers.timer.aspx >
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