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minerd.1
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.TH MINERD 1 "November 2013" "cpuminer 2.3.2"
.SH NAME
minerd \- CPU miner for Bitcoin based Cryptocurrencies
.SH SYNOPSIS
.B minerd
[\fIOPTION\fR]...
.SH DESCRIPTION
.B minerd
is a multi-threaded CPU miner for Bitcoin, Litecoin and other cryptocurrencies.
It supports the getwork mining protocol as well as the Stratum mining protocol.
.PP
In its normal mode of operation, \fBminerd\fR connects to a mining server
(specified with the \fB\-o\fR option), receives work from it and starts hashing.
As soon as a solution is found, it is submitted to the same mining server,
which can accept or reject it.
When using the getwork protocol, \fBminerd\fR can take advantage
of the long polling extension, if the server supports it;
in any case, fresh work is fetched as needed.
When using the Stratum protocol this is not possible,
and the server is responsible for sending fresh work at least every minute;
if it fails to do so,
\fBminerd\fR may drop the connection and try reconnecting again.
.PP
By default, \fBminerd\fR writes all its messages to standard error.
On systems that have a syslog, the \fB\-\-syslog\fR option can be used
to write to it instead.
.PP
On start, the nice value of all miner threads is set to 19.
On Linux, the scheduling policy is also changed to SCHED_IDLE,
or to SCHED_BATCH if that fails.
On multiprocessor systems, \fBminerd\fR
automatically sets the CPU affinity of miner threads
if the number of threads is a multiple of the number of processors.
.SH EXAMPLES
To connect to a Litecoin mining pool that provides a Stratum server
at example.com on port 3333, authenticating as worker "foo" with password "bar":
.PP
.nf
.RS
minerd \-o stratum+tcp://example.com:3333 \-O foo:bar
.RE
.fi
.PP
To mine to a local Bitcoin testnet instance running on port 18332,
authenticating with username "rpcuser" and password "rpcpass":
.PP
.nf
.RS
minerd \-a sha256d \-o http://localhost:18332 \-O rpcuser:rpcpass
.RE
.fi
.PP
To connect to a Litecoin P2Pool node running on my.server on port 9327,
mining in the background and having output sent to the syslog facility,
omitting the per-thread hashmeter output:
.PP
.nf
.RS
minerd \-BSq \-o http://my.server:9327
.RE
.fi
.SH OPTIONS
.TP
\fB\-a\fR, \fB\-\-algo\fR=\fIALGORITHM\fR
Set the hashing algorithm to use.
Default is scrypt.
Possible values are:
.RS 11
.TP 10
.B scrypt
scrypt(1024, 1, 1) (used by Litecoin)
.TP
.B sha256d
SHA-256d (used by Bitcoin)
.TP
.B skein
skein (used by Skeincoin)
.TP
.B quark
Quark multi-hash (used by Quark)
.RE
.TP
\fB\-\-benchmark\fR
Run in offline benchmark mode.
.TP
\fB\-B\fR, \fB\-\-background\fR
Run in the background as a daemon.
.TP
\fB\-\-cert\fR=\fIFILE\fR
Set a SSL certificate to use with the mining server.
Only supported when using the HTTPS protocol.
.TP
\fB\-c\fR, \fB\-\-config\fR=\fIFILE\fR
Load options from a configuration file.
\fIFILE\fR must contain a JSON object
mapping long options to their arguments (as strings),
or to \fBtrue\fR if no argument is required.
Sample configuration file:
.nf
{
"url": "stratum+tcp://example.com:3333",
"userpass": "foo:bar",
"retry-pause": "10",
"quiet": true
}
.fi
.TP
\fB\-D\fR, \fB\-\-debug\fR
Enable debug output.
.TP
\fB\-h\fR, \fB\-\-help\fR
Print a help message and exit.
.TP
\fB\-\-no\-longpoll\fR
Do not use long polling.
.TP
\fB\-\-no\-stratum\fR
Do not switch to Stratum, even if the server advertises support for it.
.TP
\fB\-o\fR, \fB\-\-url\fR=[\fISCHEME\fR://][\fIUSERNAME\fR[:\fIPASSWORD\fR]@]\fIHOST\fR:\fIPORT\fR[/\fIPATH\fR]
Set the URL of the mining server to connect to.
Supported schemes are \fBhttp\fR, \fBhttps\fR and \fBstratum+tcp\fR.
If no scheme is specified, http is used.
Specifying a \fIPATH\fR is only supported for HTTP and HTTPS.
Specifying credentials has the same effect as using the \fB\-O\fR option.
If no mining server is provided,
the miner will try to connect to http://127.0.0.1:9332/,
corresponding to the default settings for a local Litecoin daemon.
.TP
\fB\-O\fR, \fB\-\-userpass\fR=\fIUSERNAME\fR:\fIPASSWORD\fR
Set the credentials to use for connecting to the mining server.
Any value previously set with \fB\-u\fR or \fB\-p\fR is discarded.
.TP
\fB\-p\fR, \fB\-\-pass\fR=\fIPASSWORD\fR
Set the password to use for connecting to the mining server.
Any password previously set with \fB\-O\fR is discarded.
.TP
\fB\-P\fR, \fB\-\-protocol\-dump\fR
Enable output of all protocol-level activities.
.TP
\fB\-q\fR, \fB\-\-quiet\fR
Disable per-thread hashmeter output.
.TP
\fB\-r\fR, \fB\-\-retries\fR=\fIN\fR
Set the maximum number of times to retry if a network call fails.
If not specified, the miner will retry indefinitely.
.TP
\fB\-R\fR, \fB\-\-retry\-pause\fR=\fISECONDS\fR
Set how long to wait between retries. Default is 30 seconds.
.TP
\fB\-s\fR, \fB\-\-scantime\fR=\fISECONDS\fR
Set an upper bound on the time the miner can go without fetching fresh work.
This setting has no effect in Stratum mode or when long polling is activated.
Default is 5 seconds.
.TP
\fB\-S\fR, \fB\-\-syslog\fR
Log to the syslog facility instead of standard error.
.TP
\fB\-t\fR, \fB\-\-threads\fR=\fIN\fR
Set the number of miner threads.
If not specified, the miner will try to detect the number of available processors
and use that.
.TP
\fB\-T\fR, \fB\-\-timeout\fR=\fISECONDS\fR
Set the timeout for long polling. Default is 270 seconds.
.TP
\fB\-u\fR, \fB\-\-user\fR=\fIUSERNAME\fR
Set the username to use for connecting to the mining server.
Any username previously set with \fB\-O\fR is discarded.
.TP
\fB\-V\fR, \fB\-\-version\fR
Display version information and quit.
.TP
\fB\-x\fR, \fB\-\-proxy\fR=[\fISCHEME\fR://]\fIHOST\fR:\fIPORT\fR
Connect to the mining server through a proxy.
Supported schemes are: \fBhttp\fR, \fBsocks4\fR, \fBsocks5\fR.
Since libcurl 7.18.0, the following are also supported:
\fBsocks4a\fR, \fBsocks5h\fR (SOCKS5 with remote name resolving).
If no scheme is specified, the proxy is treated as an HTTP proxy.
HTTP proxies cannot be used to connect to Stratum servers.
.SH ENVIRONMENT
The following environment variables can be specified in lower case or upper case;
the lower-case version has precedence. \fBhttp_proxy\fR is an exception
as it is only available in lower case.
.PP
.RS
.TP
\fBhttp_proxy\fR [\fISCHEME\fR://]\fIHOST\fR:\fIPORT\fR
Sets the proxy server to use for HTTP.
.TP
\fBHTTPS_PROXY\fR [\fISCHEME\fR://]\fIHOST\fR:\fIPORT\fR
Sets the proxy server to use for HTTPS.
.TP
\fBALL_PROXY\fR [\fISCHEME\fR://]\fIHOST\fR:\fIPORT\fR
Sets the proxy server to use if no protocol-specific proxy is set.
.RE
.PP
Using an environment variable to set the proxy has the same effect as
using the \fB\-x\fR option.
.SH AUTHOR
Most of the code in the current version of minerd was written by
Pooler <[email protected]> with contributions from others.
The original minerd was written by Jeff Garzik <[email protected]>.