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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
To: Matthias Apitz <guru@unixarea.de>
Subject: Re: slowdown because of gettimeofday change between 9.2 and 10?
References: <5307E64C.3040108@att.net> <5308D37B.50908@att.net>
 <20140222171602.GA2265@La-Habana> <20140222181449.GA2475@La-Habana>
Date: Sat, 22 Feb 2014 15:36:19 -0500
In-Reply-To: <20140222181449.GA2475@La-Habana> (Matthias Apitz's message of
 "Sat, 22 Feb 2014 19:14:49 +0100")
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Cc: Kostas Oikonomou <k.oikonomou@att.net>, freebsd-questions@freebsd.org
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Matthias Apitz <guru@unixarea.de> writes:

> El d=EDa Saturday, February 22, 2014 a las 06:16:03PM +0100, Matthias Api=
tz escribi=F3:
>
>> > 2) I checked on another system which runs the same application, but
>> > under 9.2.  It turns out that the application issues the same calls to
>> > gettimeofday, also on a continuous basis, and, furthermore the numbers
>> > of calls on the two systems over a period of 15 seconds are almost the=
 same.
>> >=20
>> > So there must be some other difference between 9.2 and 10.0 that causes
>> > the slowdown.
>>=20
>> In my case it is:
>>=20
>> $ uname -a
>> FreeBSD La-Habana 10.0-CURRENT FreeBSD 10.0-CURRENT #0 r250588M: Sat
>> Jun 22 14:15:48 CEST 2013
>> guru@La-Habana:/usr/obj/usr/home/guru/head/src/sys/GENERIC i386
>>=20
>> The app in question (kabc) was compiled based on the ports at this time.
>
> $ truss -f -o tr kaddressbook
> kdecore (KAction): WARNING: KActionCollection::KActionCollection(
> QObject *parent, const char *name, KInstance *instance )
> $ fgrep gettimeofday tr | wc -l
>     2262

FreeBSD has *always* had a slower (but, it looks like, more accurate)
gettimeofday() implementation than some other systems. This is an
infamous slowdown for Java.