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Don't request work too early for CPUs as CPUs will scan for the full opt_scantime anyway.

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This commit is contained in:
Con Kolivas 2011-07-26 15:16:39 +10:00
parent 6045c4d161
commit 7e7a5f777e
1 changed files with 9 additions and 3 deletions
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12
main.c
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@ -2401,14 +2401,20 @@ static void *miner_thread(void *userdata)
bool needs_work = true; bool needs_work = true;
/* Try to cycle approximately 5 times before each log update */ /* Try to cycle approximately 5 times before each log update */
const unsigned long cycle = opt_log_interval / 5 ? : 1; const unsigned long cycle = opt_log_interval / 5 ? : 1;
/* Request the next work item at 2/3 of the scantime */ int request_interval;
unsigned const int request_interval = opt_scantime * 2 / 3 ? : 1;
unsigned const long request_nonce = MAXTHREADS / 3 * 2; unsigned const long request_nonce = MAXTHREADS / 3 * 2;
bool requested = true; bool requested = true;
uint32_t hash_div = 1; uint32_t hash_div = 1;
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
/* Request the next work item just before the end of the scantime. We
* don't want the work lying around too long since the CPU will always
* spend the full scantime */
request_interval = opt_scantime - 5;
if (request_interval < 1)
request_interval = 1;
/* Set worker threads to nice 19 and then preferentially to SCHED_IDLE /* Set worker threads to nice 19 and then preferentially to SCHED_IDLE
* and if that fails, then SCHED_BATCH. No need for this to be an * and if that fails, then SCHED_BATCH. No need for this to be an
* error if it fails */ * error if it fails */
@ -2554,7 +2560,7 @@ static void *miner_thread(void *userdata)
} }
timeval_subtract(&diff, &tv_end, &tv_workstart); timeval_subtract(&diff, &tv_end, &tv_workstart);
if (!requested && (diff.tv_sec > request_interval || work.blk.nonce > request_nonce)) { if (!requested && (diff.tv_sec >= request_interval || work.blk.nonce > request_nonce)) {
if (unlikely(!queue_request())) { if (unlikely(!queue_request())) {
applog(LOG_ERR, "Failed to queue_request in miner_thread %d", thr_id); applog(LOG_ERR, "Failed to queue_request in miner_thread %d", thr_id);
goto out; goto out;