Re: daemontools tai64n is unbuffered, s6-tai64n is fully buffered

From: Buck Evan <buck_at_yelp.com>
Date: Tue, 20 Oct 2015 09:48:44 -0700

Another micro-bug: s6-tai64nlocal adds an additional space where it
shouldn't really.

Compare:

$ yes oh, hi! | pv -qL 10 | tai64n | s6-tai64nlocal
2015-10-20 09:47:02.681071500 oh, hi!
2015-10-20 09:47:03.493098500 oh, hi!
2015-10-20 09:47:04.304479500 oh, hi!
^C

 yes oh, hi! | pv -qL 10 | tai64n | tai64nlocal
2015-10-20 09:47:44.813611500 oh, hi!
2015-10-20 09:47:45.625627500 oh, hi!
2015-10-20 09:47:46.436990500 oh, hi!
2015-10-20 09:47:47.248335500 oh^C




On Tue, Oct 20, 2015 at 9:38 AM, Buck Evan <buck_at_yelp.com> wrote:

> Thanks! Trying now...
>
> After bumping to your latest releases, s6-tai64n now shows line-buffered
> behavior.
>
> Close enough!
>
> On Tue, Oct 20, 2015 at 1:54 AM, Laurent Bercot <ska-skaware_at_skarnet.org>
> wrote:
>
>> On 20/10/2015 02:16, Buck Evan wrote:
>>
>>> My canonical slowly-printing example is:
>>>
>>> yes hello world | pv -qL 10 | tai64n
>>>
>>> Under daemontools classic you'll see the output gradually appear
>>> character
>>> by character, with timestamps.
>>> Under s6, this seems to hang and I ctrl-c it. I'm sure if I waited a good
>>> long while it would print, but this shows the difference in usability.
>>>
>>
>> s6-tai64n flushes its stdout before going back to read its stdin again.
>> It will never keep unflushed logs in memory.
>>
>> You are very likely using a version of s6-tai64n linked against a shared
>> libskarnet.so.2.3.7.0 or earlier, which sometimes flushes stdout
>> incorrectly. Please grab the latest skalibs and recompile. (Or use the
>> static version of libskarnet, which does not exhibit the bug.)
>>
>> --
>> Laurent
>>
>>
>
Received on Tue Oct 20 2015 - 16:48:44 UTC