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I have pretty much no idea what I'm doing. But I've had cpuminer running on my laptop for a half hour or so, just playing around. I know it's not near worth the time or electricity, I'm just having some fun.

I'm using Slush's pool, and ran the program:

./minerd --url http://api.bitcoin.cz:8332 --user <me> --pass <pass> --threads 8

And I seem to be generating normal output:

[2013-11-27 13:28:05] thread 7: 291732 hashes, 5.18 khash/s
[2013-11-27 13:28:05] accepted: 0/151 (0.00%), 41.48 khash/s (booooo)
[2013-11-27 13:28:08] Stratum detected new block
[2013-11-27 13:28:08] thread 3: 183216 hashes, 5.18 khash/s
[2013-11-27 13:28:08] thread 7: 17988 hashes, 5.28 khash/s
[2013-11-27 13:28:08] thread 1: 38664 hashes, 5.26 khash/s
[2013-11-27 13:28:08] thread 6: 151224 hashes, 5.16 khash/s
[2013-11-27 13:28:08] thread 4: 161664 hashes, 5.18 khash/s
[2013-11-27 13:28:08] thread 2: 79848 hashes, 5.16 khash/s
[2013-11-27 13:28:08] thread 5: 60576 hashes, 5.21 khash/s
[2013-11-27 13:28:08] thread 0: 164808 hashes, 5.17 khash/s
[2013-11-27 13:28:09] thread 3: 5484 hashes, 5.33 khash/s
[2013-11-27 13:28:10] accepted: 0/152 (0.00%), 41.74 khash/s (booooo)

But I don't know how long it normally takes for my account to begin displaying any kind of progress:

enter image description here

My CPU usage is pegged at around 750%, which makes sense - but I'm not sure how I'll know if/when they're contributing to anything.

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3 Answers

up vote 10 down vote accepted

You're using the wrong hash algorithm for Bitcoin mining. Bitcoin uses SHA256d (d = double), but cpuminer (at least the version 2.3.2 on my system) defaults to scrypt (for Litecoin) instead:

-a, --algo=ALGO       specify the algorithm to use
                      scrypt    scrypt(1024, 1, 1) (default)
                      sha256d   SHA-256d

Slush's pool is Bitcoin, so you should add -a sha256d to your command line. You'll see a much higher hash rate (scrypt is intentionally much slower to compute than SHA256) and you'll get yay!!! instead of booooo after some time in your log:

[2013-12-09 21:51:25] thread 0: 49985792 hashes, 832.61 khash/s
[2013-12-09 21:51:29] thread 1: 51072988 hashes, 841.16 khash/s
[2013-12-09 21:52:23] thread 0: 49956628 hashes, 864.18 khash/s
[2013-12-09 21:52:32] thread 1: 50469540 hashes, 808.16 khash/s
[2013-12-09 21:53:26] thread 0: 51850904 hashes, 833.58 khash/s
[2013-12-09 21:53:29] thread 1: 48489516 hashes, 855.40 khash/s
[2013-12-09 21:54:25] thread 1: 46821320 hashes, 834.33 khash/s
[2013-12-09 21:54:25] accepted: 1/1 (100.00%), 1668 khash/s (yay!!!)
[2013-12-09 21:54:25] thread 0: 50014552 hashes, 838.40 khash/s
[2013-12-09 21:54:41] thread 1: 13586032 hashes, 850.75 khash/s
[2013-12-09 21:54:41] accepted: 2/2 (100.00%), 1689 khash/s (yay!!!)

For best results, you should also use the above mentioned stratum+tcp protocol and adjust --threads to the number of cores in the system.

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try using stratum+tcp:// instead of http:// protocol.

./minerd --algo scrypt --scantime 33 --url stratum+tcp://[server]:[port] --userpass [username]:[password] --threads 1 --retries -1 -P works pretty well for me right now.

minerd is from http://optimate.dl.sourceforge.net/project/cpuminer/pooler-cpuminer-2.3.2-linux-x86_64.tar.gz

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What does the --no-longpoll flag mean? What is X-Long-Polling support? –  Rasoul Dec 16 '13 at 14:01
    
Using bitcoin algo sha256d minerd -a sha256d -o stratum+tcp://[server]:[port] -O [username]:[password] –  stormwild Jan 24 at 17:30
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EDIT: Looks like you're using minerd (which to my understanding doesn't have stratum support.) Slush's pool requires it (the FAQ seems to mention this briefly).

Suggestion: Try using one of the miners listed in the FAQ.

Old post: It looks like new blocks are being generated faster than your machine can complete a single unit of work.

Perhaps you could provide us with a more complete log file?

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Thanks! Pastebin'd log file: pastebin.com/nNVJ33YV –  Craig Otis Nov 27 '13 at 19:34
    
@CraigOtis See my updated answer for another (somewhat more informed) idea. –  Joshua Shearer Nov 27 '13 at 19:52
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