patients, I wanted to be sure not to save wrong
information. It wouldn't matter if the clock is
saying we are on XVII century, as long as 10 seconds
would never be 10.1.
What are the interval durations you need to measure?
Since they are from equipment, what is the spec?
I read from serial
Steve Schafer ha scritto:
On Fri, 09 Jan 2009 09:28:49 -0600, you wrote:
I'm not sure that the original question implied *that* level of need.
I can't imagine being worried about leap seconds yet at the same time
being willing to accept the potential vagaries of any of the built-in
clocks.
On Sat, 10 Jan 2009 15:04:36 +0100, you wrote:
POSIX realtime extensions have been developed to be high reliable.
I think people are missing the details here. Yes, the built-in real-time
clocks have excellent long-term accuracy. They run UTC-based correction
algorithms using NTP, and are thus
POSIX realtime extensions have been developed to be high reliable.
(...) However, they offer
no guarantees on interval measurements, and the correction algorithms
can cause the measurement of a time interval of an hour or so duration
to be off by +/- 1 sec, especially within the first few hours
Mauricio ha scritto:
POSIX realtime extensions have been developed to be high reliable.
(...) However, they offer
no guarantees on interval measurements, and the correction algorithms
can cause the measurement of a time interval of an hour or so duration
to be off by +/- 1 sec, especially
Mauricio wrote:
patients, I wanted to be sure not to save wrong
information. It wouldn't matter if the clock is
saying we are on XVII century, as long as 10 seconds
would never be 10.1.
Chris (yes I am an experimental physicist) asks:
What are the interval durations you need to measure?
benchpress also uses System.CPUTime -- is
that what you are looking for?
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time. (Supose
my software is
Hello Mauricio,
Friday, January 9, 2009, 4:01:18 PM, you wrote:
computer has been turned on would do all I need. Or,
maybe, how much has elapsed since the program started.
i think you should look into system counters (if you on windows). for
example, task managet in vista shows time since
Don't know if it might help but:
http://en.wikipedia.org/wiki/RDTSC
cabal install rdtsc
http://hackage.haskell.org/packages/archive/rdtsc/1.1.1/doc/html/System-CPUTime-Rdtsc.html
Regards,
CS
2009/1/9 Bulat Ziganshin bulat.zigans...@gmail.com
Hello Mauricio,
Friday, January 9, 2009, 4:01:18
Hello Cetin,
Friday, January 9, 2009, 4:29:04 PM, you wrote:
yes, i mean this lib but forget its name :) thank you
Don't know if it might help but:
http://en.wikipedia.org/wiki/RDTSC
cabal install rdtsc
Mauricio ha scritto:
benchpress also uses System.CPUTime -- is
that what you are looking for?
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time.
Cetin Sert ha scritto:
Don't know if it might help but:
http://en.wikipedia.org/wiki/RDTSC
cabal install rdtsc
http://hackage.haskell.org/packages/archive/rdtsc/1.1.1/doc/html/System-CPUTime-Rdtsc.html
Note that the use of RDTSC register has some issues on multicore CPU.
More info at:
Both wikipedia and hackage rdtsc packages have lot of
warnings regarding things I'm not able to control. It
seems it doesn't work with many platforms, be it older
or multi-core, hibernating computers.
yes, i mean this lib but forget its name :) thank you
Don't know if it might help but:
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time. (Supose
my software is running midnight at the end
Steve Schafer wrote:
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time. (Supose
my software is
John Goerzen ha scritto:
Steve Schafer wrote:
On Fri, 09 Jan 2009 11:01:18 -0200, you wrote:
I'm writing a program that will read medical signs
from many patients. It's important to have a precise
measure of the time interval between some signs, and
that can't depend on adjustments of time.
Here's a basic draft project for clock_gettime(CLOCK_MONOTONIC, ...)
http://sert.homedns.org/hs/mnsec/
http://sert.homedns.org/hs/mnsec/dist/mnsec-1.0.0.tar.gz
It could be extended to cover other clock types than just monotonic.
Regards,
CS
2009/1/9 John Goerzen jgoer...@complete.org
Steve
Linux has High-Resolution Timers (HRTs) that may be appropriate. See
the manpage for clock_gettime(), which defines these HRTs:
[...]
CLOCK_MONOTONIC, in particular, looks suitable. Using it could be a
matter of just a few quick likes in FFI.
I don't know if Windows has similar features.
On Fri, 09 Jan 2009 09:28:49 -0600, you wrote:
I'm not sure that the original question implied *that* level of need.
I can't imagine being worried about leap seconds yet at the same time
being willing to accept the potential vagaries of any of the built-in
clocks.
Steve Schafer
Fenestra
Is there an alternative? Something like how much
time has passed since the program has started would
be great.
Have a look at benchpress on hackage.
But benchpress uses Data.Time.Clock.getCurrentTime. I understand
that is dependent from configuration. It's okay to benchmark a
fast
Mauricio wrote:
But benchpress uses Data.Time.Clock.getCurrentTime. I understand
that is dependent from configuration. It's okay to benchmark a
fast application, but mine will be running for days, so it
would not be reliable.
benchpress also uses System.CPUTime -- is that what you are looking
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