Hello, thanks for this report; I suspect this would prevent the Time And
Date Settings... dialog box from changing the timezone for already-
running processes. It might make sense for very stationary systems but
wouldn't be very friendly for travelers with more mobile machines.
Thanks
** Changed in: shadow (Ubuntu)
Status: New => Opinion
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to shadow in Ubuntu.
https://bugs.launchpad.net/bugs/1669055
Title:
TZ is not set by default
Status in shadow package in Ubuntu:
Opinion
Bug description:
It seems that unsetting the environment variable TZ there is a huge
performance penalty calling some glibc functions, eg. time()
this has been documented here:
https://blog.packagecloud.io/eng/2017/02/21/set-environment-variable-
save-thousands-of-system-calls/
and I can confirm it on an amd64 system running Yakkety:
$ cat time.c
#include <time.h>
int main(int argc, char *argv[])
{
int i = 0;
time_t timep;
for (i = 0; i < 10000000; i++) {
time(&timep);
localtime(&timep);
}
return 0;
}
$ gcc -Wall -O3 time.c -o time
$ time ./time
real 0m7.102s
user 0m2.060s
sys 0m5.040s
$ time TZ=:/etc/localtime ./time
real 0m0.952s
user 0m0.948s
sys 0m0.000s
$
I've set TZ in /etc/environment to have it globally defined.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1669055/+subscriptions
--
Mailing list: https://launchpad.net/~touch-packages
Post to : touch-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~touch-packages
More help : https://help.launchpad.net/ListHelp
