MAJOR: threads: enable one thread per CPU by default
Threads have long matured by now, still for most users their usage is
not trivial. It's about time to enable them by default on platforms
where we know the number of CPUs bound. This patch does this, it counts
the number of CPUs the process is bound to upon startup, and enables as
many threads by default. Of course, "nbthread" still overrides this, but
if it's not set the default behaviour is to start one thread per CPU.
The default number of threads is reported in "haproxy -vv". Simply using
"taskset -c" is now enough to adjust this number of threads so that there
is no more need for playing with cpu-map. And thanks to the previous
patches on the listener, the vast majority of configurations will not
need to duplicate "bind" lines with the "process x/y" statement anymore
either, so a simple config will automatically adapt to the number of
processors available.
diff --git a/include/common/hathreads.h b/include/common/hathreads.h
index e4603a5..0cd00fb 100644
--- a/include/common/hathreads.h
+++ b/include/common/hathreads.h
@@ -984,11 +984,14 @@
#endif /* USE_THREAD */
+extern int thread_cpus_enabled_at_boot;
+
static inline void __ha_compiler_barrier(void)
{
__asm __volatile("" ::: "memory");
}
int parse_nbthread(const char *arg, char **err);
+int thread_get_default_count();
#endif /* _COMMON_HATHREADS_H */