Blender Git Commit Log

Git Commits -> Revision 945e18f

June 25, 2020, 07:32 (GMT)
Fix T76767: Cycles performance regression with CLI renders

When picking a small tile size when doing a CLI render will
yield many status updates being printed to the console
causing a slowdown in the render process. 2.79 with the
same amount of tiles did not have this slowdown.

The reason for this turned out to be a debugging aid added
in rBd2757d149bf2 which disabled buffering for stdout which
on windows caused every single character being printed to the
console to try to obtain a mutex, and worse the thread being
put to sleep when this mutex was unavailable leading to poor
performance.

This patch changes the behaviour by only disabling the
buffering in debug builds.

CLI render of the default cube with 16x16 tiles at 1080p

2.83 : 37.57s
now : 17.03s

note: this only affected CLI renders, renders from the UI
do not report this kind of information and had no such
slowdown.

Commit Details:

Full Hash: 945e18f037108c2767617ddba339e0f7938329d8
Parent Commit: 293b00b
Committed By: Jeroen Bakker
Lines Changed: +5, -1

By: Miika HämäläinenLast update: Nov-07-2014 14:18 MiikaHweb | 2003-2021