News about the idle gpu issue (leading to lower hashrate on the pool).
I monitored the power usage and when it drops I get this kind of debug output:
[2015-09-03 11:27:42] sleeptime: 500 ms
[2015-09-03 11:27:42] DEBUG: job_id=5e8126d 67b xnonce2=3e000000 time=11:27:09
[2015-09-03 11:27:42] GPU #3: start=99999999 end=9a68f324 range=00cf598b
many times, leading to a sleep time of 10/15 seconds.
meanwhile, the gpus are idle.
it happens more on neoscrypt than quark or x11.
EDIT: the problem is reduced increasing scantime (and vice-versa)
from this code: (ccminer.cpp)
if (have_stratum)
{
uint32_t sleeptime = 0;
while (!work_done && time(NULL) >= (g_work_time + opt_scantime))
{
usleep(100*1000);
if (sleeptime > 4) {
extrajob = true;
break;
}
sleeptime++;
}
if (sleeptime && opt_debug && !opt_quiet)
{
applog(LOG_DEBUG, "sleeptime: %u ms", sleeptime * 100);
}
nonceptr = (uint32_t*) (((char*)work.data) + wcmplen);
pthread_mutex_lock(&g_work_lock);
extrajob |= work_done;
if (nonceptr[0] >= end_nonce || extrajob) {
work_done = false;
extrajob = false;
stratum_gen_work(&stratum, &g_work);
}
}
yes, that's the part of code I'm looking into.
there are some things to say:
- work_done is never set to true (same for other ccminer forks...).
- I'm experiencing this problem since about a week, so there must be something in the last commits.
- the "shorter work leading to hashrate flooding" may be related to this, as I started experiencing the two problems at the same time.
)
