[mythtv-users] compiling performance question

[Richard Shaw]

On Tue, Feb 12, 2019 at 9:50 AM Tim Draper <veehexx at zoho.com> wrote:

>
>  ---- On Mon, 11 Feb 2019 17:04:41 +0000 Jon Heizer <jheizer at gmail.com>
> wrote ----
>  >
>  >
>  > On Mon, Feb 11, 2019 at 10:12 AM Tim Draper <veehexx at zoho.com> wrote:
>  > Recently upgraded from 29 to 30 but as of yet, rpm based distro's don't
> have a v30 in the repos. Cue git and self compiling. All ran with a simple
> ./configure, make, make install.
>  >
>  >  1) Compiled on 3 machines, with everything running SSD's with at least
> 4GB ram. CPU's & compile times as follows:
>  >  Laptop - i5-5200u - 3minutes (used as a test machine)
>  >  Server - Pentium G3240 - 20minutes (multipurpose, running Myth BE)
>  >  intel Nuc - Celeron N2830 - 2h40mins (Primary FE)
>  >
>  >
>  > That does seem like a long time.  In comparison my J4205 (low powered
> quad core no HT) chip has similar clock speeds but twice the cores. With
> 8GB of ram and a no name SATA SSD a refreshing git pull and clean through
> make install takes about 3min 30s.  Are you passing a -j 3 or similar to
> the make?
>  > Jon
>
> i have done -j X in the past, but for the sake of the question, left it at
> default for all kit.
> i think running -j 2 on the server does bring it down to 10-12mins.
> haven't yet tried it on the Celeron, but maybe do it overnight when the FE
> isnt in use and use 'time' to see how long it takes with -j 2.
>


As a general rule I run 2 jobs per actual core (Not hyperthreading!)

Thanks,
Richard
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