Re: [seq24-users] more timing

[Florian S. <mis...@gm...>]

On Thursday 14 September 2006 03:44, Rob Buse wrote:

> This is showing me that your seq24 timing is rock solid.  The thread is
> firing every 5ms without any jitter at all (stats_max would show that).
> You figure at 120 bpm, 1/96 notes are 20ms apart.  seq24 has kind of a
> midi "dead reckoning" built in so it figures out how long it should
> sleep to wake up exactly when a 1/96 note fires (for midi clock).  From
> the looks of things below, you are not missing anything.  Unless you are
> looking for timing grainularity smaller than 1/192 notes, I would
> suggest looking elsewhere in your soft/hardware setup.

I have slightly different numbers:

stats_avg[4043]us stats_min[4015]us stats_max[4037]us
stats_avg[4042]us stats_min[4014]us stats_max[4041]us
stats_avg[4043]us stats_min[4015]us stats_max[4040]us
stats_avg[4042]us stats_min[4014]us stats_max[4046]us
stats_avg[4043]us stats_min[4015]us stats_max[4040]us
stats_avg[4042]us stats_min[4012]us stats_max[4041]us
stats_avg[4043]us stats_min[4015]us stats_max[4039]us
stats_avg[4043]us stats_min[4015]us stats_max[4043]us
stats_avg[4042]us stats_min[4015]us stats_max[4035]us
stats_avg[4044]us stats_min[4015]us stats_max[4043]us
stats_avg[4047]us stats_min[4017]us stats_max[4063]us
stats_avg[4045]us stats_min[4015]us stats_max[4045]us
stats_avg[4047]us stats_min[4016]us stats_max[4040]us
stats_avg[4044]us stats_min[4015]us stats_max[4044]us
stats_avg[4044]us stats_min[4014]us stats_max[4042]us
stats_avg[4045]us stats_min[4014]us stats_max[4044]us
stats_avg[4043]us stats_min[4015]us stats_max[4037]us
stats_avg[4045]us stats_min[4015]us stats_max[4039]us
stats_avg[4044]us stats_min[4015]us stats_max[4046]us
stats_avg[4044]us stats_min[4015]us stats_max[4050]us
stats_avg[4045]us stats_min[4014]us stats_max[4037]us

interestingly enough though, the avg is above the max value [???]. Also, why 
do you use a 5ms timer? Doesn't such a "large" sleep time introduce extra 
systematic jitter? Wouldn't a 1ms timer already improve timing?

/me starts looking at code

Flo

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