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workers by number of cores

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Devaev Maxim
2019-05-25 00:52:49 +03:00
parent 07e9dbc0f7
commit 13dff256c8
2 changed files with 10 additions and 4 deletions
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10
src/device.c
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@@ -85,6 +85,12 @@ struct device_t *device_init() {
struct controls_t *ctl;
struct device_runtime_t *run;
struct device_t *dev;
long cores_sysconf;
unsigned cores_available;
cores_sysconf = sysconf(_SC_NPROCESSORS_ONLN);
cores_sysconf = (cores_sysconf < 0 ? 0 : cores_sysconf);
cores_available = max_u(min_u(cores_sysconf, 4), 1);
A_CALLOC(ctl, 1);
@@ -97,8 +103,8 @@ struct device_t *device_init() {
dev->height = 480;
dev->format = V4L2_PIX_FMT_YUYV;
dev->standard = V4L2_STD_UNKNOWN;
dev->n_buffers = max_u(min_u(sysconf(_SC_NPROCESSORS_ONLN), 4), 1) + 1;
dev->n_workers = dev->n_buffers;
dev->n_buffers = cores_available + 1;
dev->n_workers = min_u(cores_available, dev->n_buffers);
dev->timeout = 1;
dev->error_delay = 1;
dev->ctl = ctl;

4
src/main.c
View File

@@ -133,9 +133,9 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
printf(" to automatic resolution change. Default: disabled.\n\n");
printf(" -b|--buffers <N> ─────────────── The number of buffers to receive data from the device.\n");
printf(" Each buffer may processed using an intermediate thread.\n");
printf(" Default: %u (the number of CPU cores (but not more 4) + 1).\n\n", dev->n_buffers);
printf(" Default: %u (the number of CPU cores (but not more than 4) + 1).\n\n", dev->n_buffers);
printf(" -w|--workers <N> ─────────────── The number of worker threads but not more than buffers.\n");
printf(" Default: %u (== --buffers).\n\n", dev->n_workers);
printf(" Default: %u (the number of CPU cores (but not more than 4)).\n\n", dev->n_workers);
printf(" -q|--quality <N> ─────────────── Set quality of JPEG encoding from 1 to 100 (best). Default: %u.\n\n", encoder->quality);
printf(" -c|--encoder <type> ──────────── Use specified encoder. It may affects to workers number.\n");
printf(" Available: %s; default: CPU.\n\n", ENCODER_TYPES_STR);