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Add a new CLI option -M or --max-diff for limiting mining to low-difficulty periods #199

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Add a new CLI option -M or --max-diff for limiting mining to low-difficulty periods #199

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d0e8e0e
Added -M / --max-diff option
cculianu May 10, 2020
1c30457
max-diff: Added optional second component to argument, backoff time
cculianu May 12, 2020
8c6afd8
Whitespace/formatting nits
cculianu May 12, 2020
7684439
Merge branch 'master' of https://github.com/pooler/cpuminer
cculianu Aug 20, 2020
d2fac18
Fixed version in configure.ac for PR
cculianu Aug 20, 2020
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82 changes: 58 additions & 24 deletions cpu-miner.c
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,7 @@ static inline void affine_to_cpu(int id, int cpu)
{
}
#endif

enum workio_commands {
WC_GET_WORK,
WC_SUBMIT_WORK,
Expand Down Expand Up @@ -146,6 +146,8 @@ int longpoll_thr_id = -1;
int stratum_thr_id = -1;
struct work_restart *work_restart = NULL;
static struct stratum_ctx stratum;
static double max_diff = 0.;
static int max_diff_backoff_secs = 10;

pthread_mutex_t applog_lock;
static pthread_mutex_t stats_lock;
Expand Down Expand Up @@ -192,6 +194,11 @@ Options:\n\
--no-gbt disable getblocktemplate support\n\
--no-stratum disable X-Stratum support\n\
--no-redirect ignore requests to change the URL of the mining server\n\
-M, --max-diff=N[:T] specify a floating point value for the maximum block\n\
difficulty that we will mine (default: inf); this\n\
option is intended for testnet miners wishing to only\n\
mine when difficulty drops to 1.0 (optional :T is the\n\
time to sleep in seconds, default: 10)\n\
-q, --quiet disable per-thread hashmeter output\n\
-D, --debug enable debug output\n\
-P, --protocol-dump verbose dump of protocol-level activities\n"
Expand All @@ -217,7 +224,7 @@ static char const short_options[] =
#ifdef HAVE_SYSLOG_H
"S"
#endif
"a:c:Dhp:Px:qr:R:s:t:T:o:u:O:V";
"a:c:DhM:p:Px:qr:R:s:t:T:o:u:O:V";

static struct option const options[] = {
{ "algo", 1, NULL, 'a' },
Expand All @@ -236,6 +243,7 @@ static struct option const options[] = {
{ "no-longpoll", 0, NULL, 1003 },
{ "no-redirect", 0, NULL, 1009 },
{ "no-stratum", 0, NULL, 1007 },
{ "max-diff", 1, NULL, 'M' },
{ "pass", 1, NULL, 'p' },
{ "protocol-dump", 0, NULL, 'P' },
{ "proxy", 1, NULL, 'x' },
Expand Down Expand Up @@ -673,7 +681,7 @@ static void share_result(int result, const char *reason)
hashrate += thr_hashrates[i];
result ? accepted_count++ : rejected_count++;
pthread_mutex_unlock(&stats_lock);

sprintf(s, hashrate >= 1e6 ? "%.0f" : "%.2f", 1e-3 * hashrate);
applog(LOG_INFO, "accepted: %lu/%lu (%.2f%%), %s khash/s %s",
accepted_count,
Expand Down Expand Up @@ -1028,7 +1036,7 @@ static bool get_work(struct thr_info *thr, struct work *work)
static bool submit_work(struct thr_info *thr, const struct work *work_in)
{
struct workio_cmd *wc;

/* fill out work request message */
wc = calloc(1, sizeof(*wc));
if (!wc)
Expand Down Expand Up @@ -1072,7 +1080,7 @@ static void stratum_gen_work(struct stratum_ctx *sctx, struct work *work)
memcpy(merkle_root + 32, sctx->job.merkle[i], 32);
sha256d(merkle_root, merkle_root, 64);
}

/* Increment extranonce2 */
for (i = 0; i < sctx->xnonce2_size && !++sctx->job.xnonce2[i]; i++);

Expand Down Expand Up @@ -1130,7 +1138,7 @@ static void *miner_thread(void *userdata)
thr_id, thr_id % num_processors);
affine_to_cpu(thr_id, thr_id % num_processors);
}

if (opt_algo == ALGO_SCRYPT) {
scratchbuf = scrypt_buffer_alloc(opt_scrypt_n);
if (!scratchbuf) {
Expand All @@ -1145,6 +1153,7 @@ static void *miner_thread(void *userdata)
struct timeval tv_start, tv_end, diff;
int64_t max64;
int rc;
double work_diff;

if (have_stratum) {
while (time(NULL) >= g_work_time + 120)
Expand Down Expand Up @@ -1181,7 +1190,7 @@ static void *miner_thread(void *userdata)
work.data[19]++;
pthread_mutex_unlock(&g_work_lock);
work_restart[thr_id].restart = 0;

/* adjust max_nonce to meet target scan time */
if (have_stratum)
max64 = LP_SCANTIME;
Expand All @@ -1203,25 +1212,32 @@ static void *miner_thread(void *userdata)
max_nonce = end_nonce;
else
max_nonce = work.data[19] + max64;

hashes_done = 0;
gettimeofday(&tv_start, NULL);

/* scan nonces for a proof-of-work hash */
switch (opt_algo) {
case ALGO_SCRYPT:
rc = scanhash_scrypt(thr_id, work.data, scratchbuf, work.target,
max_nonce, &hashes_done, opt_scrypt_n);
break;
if (max_diff > 1.0 && (work_diff = diff_from_nbits(&work.data[18])) > max_diff) {
rc = 0;
applog(LOG_INFO, "thread %d: %1.1lf > max_diff %1.1lf, sleeping %d secs",
thr_id, work_diff, max_diff, max_diff_backoff_secs);
sleep(max_diff_backoff_secs);
} else {
/* scan nonces for a proof-of-work hash */
switch (opt_algo) {
case ALGO_SCRYPT:
rc = scanhash_scrypt(thr_id, work.data, scratchbuf, work.target,
max_nonce, &hashes_done, opt_scrypt_n);
break;

case ALGO_SHA256D:
rc = scanhash_sha256d(thr_id, work.data, work.target,
max_nonce, &hashes_done);
break;
case ALGO_SHA256D:
rc = scanhash_sha256d(thr_id, work.data, work.target,
max_nonce, &hashes_done);
break;

default:
/* should never happen */
goto out;
default:
/* should never happen */
goto out;
}
}

/* record scanhash elapsed time */
Expand Down Expand Up @@ -1291,7 +1307,7 @@ static void *longpoll_thread(void *userdata)
lp_url = hdr_path;
hdr_path = NULL;
}

/* absolute path, on current server */
else {
copy_start = (*hdr_path == '/') ? (hdr_path + 1) : hdr_path;
Expand Down Expand Up @@ -1445,7 +1461,7 @@ static void *stratum_thread(void *userdata)
restart_threads();
}
}

if (!stratum_socket_full(&stratum, 120)) {
applog(LOG_ERR, "Stratum connection timed out");
s = NULL;
Expand Down Expand Up @@ -1757,6 +1773,24 @@ static void parse_arg(int key, char *arg, char *pname)
}
strcpy(coinbase_sig, arg);
break;
case 'M': { /* --max-diff */
char *colon;
if (sscanf(arg, "%lf", &max_diff) != 1 || max_diff <= 1.0) {
fprintf(stderr, "%s: invalid --max-diff: %s\n", pname, arg);
show_usage_and_exit(1);
}
// Optional second component to arg e.g. "10.0:5" where 5 here
// is the time to sleep.
if ((colon = strchr(arg, ':'))) {
if (sscanf(++colon, "%d", &max_diff_backoff_secs) != 1
|| max_diff_backoff_secs < 1) {
fprintf(stderr, "%s: invalid backoff time specified for"
" --max-diff: %s\n", pname, colon);
show_usage_and_exit(1);
}
}
break;
}
case 'S':
use_syslog = true;
break;
Expand Down Expand Up @@ -1931,7 +1965,7 @@ int main(int argc, char *argv[])
thr_info = calloc(opt_n_threads + 3, sizeof(*thr));
if (!thr_info)
return 1;

thr_hashrates = (double *) calloc(opt_n_threads, sizeof(double));
if (!thr_hashrates)
return 1;
Expand Down
2 changes: 2 additions & 0 deletions miner.h
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,8 @@ extern int timeval_subtract(struct timeval *result, struct timeval *x,
struct timeval *y);
extern bool fulltest(const uint32_t *hash, const uint32_t *target);
extern void diff_to_target(uint32_t *target, double diff);
/* Return the network difficulty from the work.data[18] bits as a double. */
extern double diff_from_nbits(const void *nbits);

struct stratum_job {
char *job_id;
Expand Down
33 changes: 26 additions & 7 deletions util.c
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,7 @@ void applog(int prio, const char *fmt, ...)
va_list ap2;
char *buf;
int len;

va_copy(ap2, ap);
len = vsnprintf(NULL, 0, fmt, ap2) + 1;
va_end(ap2);
Expand Down Expand Up @@ -794,7 +794,7 @@ bool fulltest(const uint32_t *hash, const uint32_t *target)
{
int i;
bool rc = true;

for (i = 7; i >= 0; i--) {
if (hash[i] > target[i]) {
rc = false;
Expand All @@ -809,7 +809,7 @@ bool fulltest(const uint32_t *hash, const uint32_t *target)
if (opt_debug) {
uint32_t hash_be[8], target_be[8];
char hash_str[65], target_str[65];

for (i = 0; i < 8; i++) {
be32enc(hash_be + i, hash[7 - i]);
be32enc(target_be + i, target[7 - i]);
Expand All @@ -831,7 +831,7 @@ void diff_to_target(uint32_t *target, double diff)
{
uint64_t m;
int k;

for (k = 6; k > 0 && diff > 1.0; k--)
diff /= 4294967296.0;
m = 4294901760.0 / diff;
Expand All @@ -844,6 +844,25 @@ void diff_to_target(uint32_t *target, double diff)
}
}

double diff_from_nbits(const void *nbits_in)
{
double numerator;
uint32_t diff32;
uint8_t pow;
int powdiff;
const uint32_t possibly_unswabbed_bits = le32dec(nbits_in);
const uint8_t * const nbits = (const uint8_t *)&possibly_unswabbed_bits;

pow = nbits[0];
powdiff = (8 * (0x1d - 3)) - (8 * (pow - 3));
if (powdiff < 0) // testnet only
powdiff = 0;
diff32 = be32dec(nbits) & 0x00FFFFFF;
numerator = 0xFFFFULL << powdiff;

return numerator / (double)diff32;
}

#ifdef WIN32
#define socket_blocks() (WSAGetLastError() == WSAEWOULDBLOCK)
#else
Expand All @@ -853,7 +872,7 @@ void diff_to_target(uint32_t *target, double diff)
static bool send_line(struct stratum_ctx *sctx, char *s)
{
ssize_t len, sent = 0;

len = strlen(s);
s[len++] = '\n';

Expand Down Expand Up @@ -1412,7 +1431,7 @@ static bool stratum_get_version(struct stratum_ctx *sctx, json_t *id)
char *s;
json_t *val;
bool ret;

if (!id || json_is_null(id))
return false;

Expand All @@ -1437,7 +1456,7 @@ static bool stratum_show_message(struct stratum_ctx *sctx, json_t *id, json_t *p
val = json_array_get(params, 0);
if (val)
applog(LOG_NOTICE, "MESSAGE FROM SERVER: %s", json_string_value(val));

if (!id || json_is_null(id))
return true;

Expand Down