I noticed that on a new RELENG_10 box we are building, password updates
are taking a very long time to build. On the old RELENG_8 box, doing
something simple like adding a user
# time pw useradd test12345
0.062u 0.063s 0:00.14 85.7% 54+988k 196+134io 0pf+0w
# time pw userdel test12345
0.164u 0.044s 0:00.20 100.0% 28+1181k 0+18io 0pf+0w
On the new RELENG_10 box,
# time pw useradd test12345
0.060u 0.120s 0:58.89 0.3% 58+146k 12+6485io 0pf+0w
# time pw userdel test12345
0.125u 0.133s 0:58.80 0.4% 46+214k 13+9326io 0pf+0w
# wc /etc/passwd
6113 14792 376128 /etc/passwd
Yes, almost 60 seconds to add a user to the password file?
Does anyone know what is going on to account for the large difference
and how to work around it ? I am guessing
https://svnweb.freebsd.org/base?view=revision&revision=285205
is the issue. Apart from keeping local source code changes, is there not
a better way to not have reasonable speeds ?
---Mike
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
Am 11.02.2016 um 16:02 schrieb Mike Tancsa:> I noticed that on a new RELENG_10 box we are building, password updates > are taking a very long time to build. On the old RELENG_8 box, doing > something simple like adding a user > > # time pw useradd test12345 > 0.062u 0.063s 0:00.14 85.7% 54+988k 196+134io 0pf+0w > > # time pw userdel test12345 > 0.164u 0.044s 0:00.20 100.0% 28+1181k 0+18io 0pf+0w > > > On the new RELENG_10 box, > > # time pw useradd test12345 > 0.060u 0.120s 0:58.89 0.3% 58+146k 12+6485io 0pf+0w > > # time pw userdel test12345 > 0.125u 0.133s 0:58.80 0.4% 46+214k 13+9326io 0pf+0w > > > # wc /etc/passwd > 6113 14792 376128 /etc/passwd > > > Yes, almost 60 seconds to add a user to the password file? > > Does anyone know what is going on to account for the large difference > and how to work around it ? I am guessingYou are affected by the problem mentioned in https://reviews.freebsd.org/D5186 The output file is written with O_SYNC a record at a time and this is slow (100 to 200 records per second on a non-SSD drive). This will be fixed in -CURRENT soon and I think the fix should qualify for inclusion in the next 10-BETA, thereafter. Regards, STefan> https://svnweb.freebsd.org/base?view=revision&revision=285205 > > is the issue. Apart from keeping local source code changes, is there not > a better way to not have reasonable speeds ? > > ---Mike
> On Feb 11, 2016, at 13:02, Mike Tancsa <mike at sentex.net> wrote: > > I noticed that on a new RELENG_10 box we are building, password updates > are taking a very long time to build. On the old RELENG_8 box, doing > something simple like adding a user > > # time pw useradd test12345 > 0.062u 0.063s 0:00.14 85.7% 54+988k 196+134io 0pf+0w > > # time pw userdel test12345 > 0.164u 0.044s 0:00.20 100.0% 28+1181k 0+18io 0pf+0w > > > On the new RELENG_10 box, > > # time pw useradd test12345 > 0.060u 0.120s 0:58.89 0.3% 58+146k 12+6485io 0pf+0w > > # time pw userdel test12345 > 0.125u 0.133s 0:58.80 0.4% 46+214k 13+9326io 0pf+0w > > > # wc /etc/passwd > 6113 14792 376128 /etc/passwd > > > Yes, almost 60 seconds to add a user to the password file? > > Does anyone know what is going on to account for the large difference > and how to work around it ? I am guessing > > https://svnweb.freebsd.org/base?view=revision&revision=285205 > > is the issue. Apart from keeping local source code changes, is there not > a better way to not have reasonable speeds ?A possible solution is being discussed at https://reviews.freebsd.org/D5186 If you can try out that patch and provide a feedback it would be great -- Renato Botelho