Ichthyostega
1316ee2c7f
Investigate the behaviour over a wider range of job loads, job count and worker pool sizes. Seemingly the processing can not fully utilise the available worker pool capacity. By inspection of trace-dumps, one impeding mechanism could be identified: the »stickiness« of the contention mitigation. Whenever a worker encounters repeated contention, it steps up and adds more and more wait cycles to remove pressure from the schedule coordination. As such this is fine and prevents further degradation of performance by repeated atomic synchronisation. However, this throttling was kept up needlessly after further successful work-pulls. Since job times of several milliseconds can be expected on average in media processing, such a long retention would spread a performance degradation over a duration of several frames. Thus, the scheme for step-down was changed to decrease the throttling by a power series rather than just documenting the level. |
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