On Mon, 5 Sep 2022, Martin Storsjö wrote:
This matches a similar cap on the number of automatic threads
in libavcodec/pthread_slice.c.
On systems with lots of cores, this does speed things up in
general (measurable on the level of the runtime of running
"make fate"), and fixes a couple fate failures in 32 bit mode on
such machines (where spawning a huge number of threads runs
out of address space).
---
On second thought - this observation that it speeds up "make -j$(nproc)
fate" isn't surprising at all; as long as there are jobs to saturate all
cores with the make level parallelism anyway, any threading within each
job just adds extra overhead, nothing more.
// Martin
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