Difference between EPOCHREALTIME and EPOCHSECONDS
Configuration Information:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -Wno-parentheses -Wno-format-security
uname output: Linux medium 4.19.0-8-amd64 #1 SMP Debian 4.19.98-1 (2020-01-26)
x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 5.0
Patch Level: 16
Release Status: release
Description:
Integer part of $EPOCHREALTIME could increase more than 8000
microseconds
before $EPOCHSECONDS
Repeat-By:
epochVariableDiff () {
local errcnt=0 lasterrcnt v1 v2 v3 us vals line
while ((errcnt==0)) || ((errcnt>lasterrcnt)); do
lasterrcnt=$errcnt
printf -v vals '%(%s)T %s %s' -1 $EPOCHSECONDS $EPOCHREALTIME
IFS=$' .' read v1 v2 v3 us <<<"$vals"
[ "$v1" = "$v2" ] && [ "$v2" = "$v3" ] || ((errcnt++))
[ $errcnt -eq 1 ] && echo "$line"
printf -v line '%3d %s - %s - %s . %s' $errcnt $v1 $v2 $v3 $us
printf "%s\r" "$line"
((errcnt)) && echo "$line"
read -t ${1:-.0002}
done
epochVariableDiff
0 1586853481 - 1586853481 - 1586853481 . 40
1 1586853481 - 1586853481 - 1586853482 . 000320
2 1586853481 - 1586853481 - 1586853482 . 000691
3 1586853481 - 1586853481 - 1586853482 . 001059
4 1586853481 - 1586853481 - 1586853482 . 001429
5 1586853481 - 1586853481 - 1586853482 . 001854
6 1586853481 - 1586853481 - 1586853482 . 002220
7 1586853481 - 1586853481 - 1586853482 . 002672
8 1586853481 - 1586853481 - 1586853482 . 003113
9 1586853481 - 1586853481 - 1586853482 . 003530
9 1586853482 - 1586853482 - 1586853482 . 003889
(My raspberry-pi seem not to be affected)
Was discovered and published at
https://stackoverflow.com/a/58557346/1765658
Re: Difference between EPOCHREALTIME and EPOCHSECONDS
On 4/14/20 4:41 AM, fe...@f-hauri.ch wrote: > Bash Version: 5.0 > Patch Level: 16 > Release Status: release > > Description: > Integer part of $EPOCHREALTIME could increase more than 8000 > microseconds > before $EPOCHSECONDS It's the difference between time() and gettimeofday(). -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
Re: Difference between EPOCHREALTIME and EPOCHSECONDS
Hello Chet, hello Felix, hello all!
> > Bash Version: 5.0
> > Patch Level: 16
> > Release Status: release
> >
> > Description:
> > Integer part of $EPOCHREALTIME could increase more than 8000
> > microseconds before $EPOCHSECONDS
>
> It's the difference between time() and gettimeofday().
I didn't believe it ;-) but running
time_gettimeofday.c:
#include
#include
#include
int main(int argc, char *argv[]) {
struct timeval tv;
time_t t;
struct timespec sleep;
sleep.tv_sec = 0;
sleep.tv_nsec = 100;
for (int i=0; i<1001; i++) {
gettimeofday(&tv, NULL);
t = time(NULL);
printf("%d.%.6d %d %d\n", tv.tv_sec, tv.tv_usec, t, tv.tv_sec-t);
nanosleep( &sleep, NULL );
}
return 0;
}
with
gcc -o time_gettimeofday time_gettimeofday.c && ./time_gettimeofday |
egrep '\.(00|99)
shows it is right...
Thanks and best regards,
Martin
Re: Difference between EPOCHREALTIME and EPOCHSECONDS
On 4/14/20 1:43 PM, Martin Schulte wrote: > Hello Chet, hello Felix, hello all! > >>> Bash Version: 5.0 >>> Patch Level: 16 >>> Release Status: release >>> >>> Description: >>> Integer part of $EPOCHREALTIME could increase more than 8000 >>> microseconds before $EPOCHSECONDS >> >> It's the difference between time() and gettimeofday(). EPOCHSECONDS is the analog of SECONDS, with the difference being the starting point. EPOCHREALTIME is supposed to be the thing you use if you want additional precision than seconds granularity. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
Re: [PATCH] Add active mark, face support; activate mark on paste
On 4/14/20 4:46 PM, gentoo_esh...@tutanota.com wrote: > Another 'face' issue(the 3rd?) I just noticed now: > if I paste something that has "\n" inside it, like these 3 lines(only the > first 2 lines have \n, but doesn't matter): > -bash: mk_add_options: command not found > -bash: mk_add_options: command not found > -bash: mk_add_options: command not found > > then they are all pasted on the same line, so I have to manually press Enter > to execute the line. This is the expected behavior with bracketed-paste enabled. The pasted text is `bracketed' by a start and end sequence -- that's how the face code knows what's been pasted and to highlight it -- and any embedded editing characters, like newline, are simply added to the editing buffer. The face code enables bracketed paste by default, since it doesn't make much sense to test it without bracketed paste enabled. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRUc...@case.eduhttp://tiswww.cwru.edu/~chet/
