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slicethread: Limit the automatic number of threads to 16

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This matches a similar cap on the number of automatic threads
in libavcodec/pthread_slice.c.

On systems with lots of cores, this fixes a couple fate failures
in 32 bit mode on such machines (where spawning a huge number of
threads runs out of address space).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2022-09-05 15:17:56 +03:00
parent e4759fa951
commit da5f7799a0
1 changed files with 3 additions and 1 deletions
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4
libavutil/slicethread.c
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@ -24,6 +24,8 @@
#include "thread.h"
#include "avassert.h"
#define MAX_AUTO_THREADS 16
#if HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS2THREADS
typedef struct WorkerContext {
@ -105,7 +107,7 @@ int avpriv_slicethread_create(AVSliceThread **pctx, void *priv,
if (!nb_threads) {
int nb_cpus = av_cpu_count();
if (nb_cpus > 1)
nb_threads = nb_cpus + 1;
nb_threads = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
else
nb_threads = 1;
}