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Only start 2 * num_queues worker threads initially. num_queues is generally

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equal to the number of cores reported by Erlang (info.scheduler_threads) which
is either determined automatically by the Erlang BEAM runtime or via the +S
flag.  The minimum num_queues is 2, so the minimum number of workers is 4.  The
maximum number of workers is ASYNC_NIF_MAX_WORKER_QUEUE_SIZE (currently set to
128), but that would only happen if there were 64 cores (or you set +S 64:64 at
startup).
This commit is contained in:
Gregory Burd 2013-04-26 10:15:15 -04:00
parent c410312c40
commit eafee02865
1 changed files with 2 additions and 2 deletions
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4
c_src/async_nif.h
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@ -36,7 +36,7 @@ extern "C" {
#define __UNUSED(v) ((void)(v))
#endif
#define ASYNC_NIF_MAX_WORKERS 1024
#define ASYNC_NIF_MAX_WORKERS 128
#define ASYNC_NIF_WORKER_QUEUE_SIZE 500
#define ASYNC_NIF_MAX_QUEUED_REQS 1000 * ASYNC_NIF_MAX_WORKERS
@ -431,7 +431,7 @@ async_nif_load()
sizeof(struct async_nif_work_queue) * num_queues);
async_nif->num_queues = num_queues;
async_nif->num_workers = ASYNC_NIF_MAX_WORKERS; // TODO: start with 2 per queue, then grow if needed
async_nif->num_workers = 2 * num_queues;
async_nif->next_q = 0;
async_nif->shutdown = 0;
async_nif->recycled_reqs = fifo_q_new(reqs, ASYNC_NIF_MAX_QUEUED_REQS);