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Icarus: Use gettimeofday to more accurately measure scanhash time, and calibrate scan time estimate based on actual data

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This commit is contained in:
Luke Dashjr 2012-04-21 14:19:22 -04:00
parent 355a87e10b
commit 11234c3353
1 changed files with 16 additions and 7 deletions
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23
driver-icarus.c
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@ -251,7 +251,7 @@ static uint64_t icarus_scanhash(struct thr_info *thr, struct work *work,
char *ob_hex, *nonce_hex;
uint32_t nonce;
uint32_t hash_count;
time_t t = 0;
struct timeval tv_start, tv_end, diff;
icarus = thr->cgpu;
fd = icarus->device_fd;
@ -264,13 +264,15 @@ static uint64_t icarus_scanhash(struct thr_info *thr, struct work *work,
#ifndef WIN32
tcflush(fd, TCOFLUSH);
#endif
gettimeofday(&tv_start, NULL);
ret = icarus_write(fd, ob_bin, sizeof(ob_bin));
if (ret)
return 0; /* This should never happen */
ob_hex = bin2hex(ob_bin, sizeof(ob_bin));
if (ob_hex) {
t = time(NULL);
applog(LOG_DEBUG, "Icarus %s send: %s",
icarus->device_id, ob_hex);
free(ob_hex);
@ -280,20 +282,25 @@ static uint64_t icarus_scanhash(struct thr_info *thr, struct work *work,
memset(nonce_bin, 0, sizeof(nonce_bin));
ret = icarus_gets(nonce_bin, sizeof(nonce_bin), fd);
gettimeofday(&tv_end, NULL);
timeval_subtract(&diff, &tv_end, &tv_start);
nonce_hex = bin2hex(nonce_bin, sizeof(nonce_bin));
if (nonce_hex) {
t = time(NULL) - t;
applog(LOG_DEBUG, "Icarus %d return (elapse %d seconds): %s",
icarus->device_id, t, nonce_hex);
applog(LOG_DEBUG, "Icarus %d returned (in %d.%06d seconds): %s",
icarus->device_id, diff.tv_sec, diff.tv_usec, nonce_hex);
free(nonce_hex);
}
memcpy((char *)&nonce, nonce_bin, sizeof(nonce_bin));
if (nonce == 0 && ret) {
t = time(NULL) - t;
if (unlikely(diff.tv_sec > 12 || (diff.tv_sec == 11 && diff.tv_usec > 300067)))
return 0xffffffff;
// Approximately how much of the nonce Icarus scans in 1 second...
return 0x16a7a561 * t;
// 0x16a7a561 would be if it was exactly 380 MH/s
// 0x168b7b4b was the average over a 201-sample period based on time to find actual shares
return (0x168b7b4b * diff.tv_sec) + (0x17a * diff.tv_usec);
}
#ifndef __BIG_ENDIAN__
@ -312,6 +319,8 @@ static uint64_t icarus_scanhash(struct thr_info *thr, struct work *work,
hash_count <<= 1;
}
applog(LOG_DEBUG, "0x%x hashes in %d.%06d seconds", hash_count, diff.tv_sec, diff.tv_usec);
return hash_count;
}