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Improve max nonce auto-adjustment with some basic algebra.

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Jeff Garzik 2011-03-17 23:22:10 -04:00 committed by Jeff Garzik
parent 33e5b54928
commit 6818c6928a
1 changed files with 5 additions and 8 deletions
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13
cpu-miner.c
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@ -500,6 +500,7 @@ static void *miner_thread(void *userdata)
struct work work __attribute__((aligned(128)));
unsigned long hashes_done;
struct timeval tv_start, tv_end, diff;
uint64_t max64;
bool rc;
/* obtain new work from internal workio thread */
@ -576,14 +577,10 @@ static void *miner_thread(void *userdata)
hashmeter(thr_id, &diff, hashes_done);
/* adjust max_nonce to meet target scan time */
if (diff.tv_sec > (opt_scantime * 2))
max_nonce /= 2; /* large decrease */
else if ((diff.tv_sec > opt_scantime) &&
(max_nonce > 1500000))
max_nonce -= 1000000; /* small decrease */
else if ((diff.tv_sec < opt_scantime) &&
(max_nonce < 0xffffec76))
max_nonce += 100000; /* small increase */
max64 = ((uint64_t)hashes_done * opt_scantime) / diff.tv_sec;
if (max64 > 0xfffffffaULL)
max64 = 0xfffffffaULL;
max_nonce = max64;
/* if nonce found, submit work */
if (rc && !submit_work(mythr, &work))