user25225: I have a question about using cpuminer to mine bitcoins. I know that it's not efficient, but I'm not about making any money from it (obviously), I just want to mine some fractions of a bitcoin.
Now, I have downloaded and compiled it on Ubuntu and then started the program as seen in the output:
 ./minerd --url=stratum+tcp://<server>:3333 --userpass=<username.worker>:<password> --algo=sha256d

[2015-04-26 20:22:45] Starting Stratum on stratum+tcp://<server>:3333
[2015-04-26 20:22:45] Binding thread 2 to cpu 2
[2015-04-26 20:22:45] Binding thread 1 to cpu 1
[2015-04-26 20:22:45] 4 miner threads started, using 'sha256d' algorithm.
[2015-04-26 20:22:45] Binding thread 0 to cpu 0
[2015-04-26 20:22:45] Binding thread 3 to cpu 3
[2015-04-26 20:22:48] thread 3: 2097152 hashes, 1814 khash/s
[2015-04-26 20:22:48] thread 0: 2097152 hashes, 1774 khash/s
[2015-04-26 20:22:48] thread 1: 2097152 hashes, 1742 khash/s
[2015-04-26 20:22:48] thread 2: 2097152 hashes, 1355 khash/s
[2015-04-26 20:23:54] thread 2: 81299404 hashes, 1230 khash/s
[2015-04-26 20:24:05] thread 1: 104547880 hashes, 1354 khash/s
[2015-04-26 20:24:13] thread 3: 108821800 hashes, 1272 khash/s
[2015-04-26 20:24:25] thread 0: 106421736 hashes, 1095 khash/s
[2015-04-26 20:25:01] thread 2: 73787712 hashes, 1102 khash/s
[2015-04-26 20:25:07] thread 1: 81252652 hashes, 1312 khash/s
[2015-04-26 20:25:14] thread 3: 76317796 hashes, 1256 khash/s
[2015-04-26 20:25:27] thread 0: 65677172 hashes, 1051 khash/s
[2015-04-26 20:25:52] thread 2: 66108472 hashes, 1305 khash/s
[2015-04-26 20:26:12] thread 3: 75386708 hashes, 1307 khash/s
[2015-04-26 20:26:15] thread 1: 78701868 hashes, 1152 khash/s
[2015-04-26 20:26:28] thread 0: 63037412 hashes, 1031 khash/s

The problem I have now, is that I never get any output like this:
[<Date>, <Time>] accepted: x/y (x/y%), <bla>khash/s (yay!!!)

and in the mining pool, I dont see my worker online.
I wonder now, if my computer does any work at all, or if it is just too slow and all the work it puts into mining goes to waste.

user24925: You are mining, but most pools today have a minimum share difficulty requirement, otherwise very fast miners bombard them with shares that they have to process and discard. For many pools this is at a minimum of 128 or higher, meaning it would take several days for a CPU miner to find a share on average. No pool has a payout of any less than 0.00001 BTC, so there is absolutely no chance of you ever being paid for your work if you are mining using a CPU or GPU at this point in time. 

25225: <p>I have a question about using cpuminer to mine bitcoins. I know that it's not efficient, but I'm not about making any money from it (obviously), I just want to mine some fractions of a bitcoin.</p>

<p>Now, I have downloaded and compiled it on Ubuntu and then started the program as seen in the output:</p>

<pre><code> ./minerd --url=stratum+tcp://&lt;server&gt;:3333 --userpass=&lt;username.worker&gt;:&lt;password&gt; --algo=sha256d

[2015-04-26 20:22:45] Starting Stratum on stratum+tcp://&lt;server&gt;:3333
[2015-04-26 20:22:45] Binding thread 2 to cpu 2
[2015-04-26 20:22:45] Binding thread 1 to cpu 1
[2015-04-26 20:22:45] 4 miner threads started, using 'sha256d' algorithm.
[2015-04-26 20:22:45] Binding thread 0 to cpu 0
[2015-04-26 20:22:45] Binding thread 3 to cpu 3
[2015-04-26 20:22:48] thread 3: 2097152 hashes, 1814 khash/s
[2015-04-26 20:22:48] thread 0: 2097152 hashes, 1774 khash/s
[2015-04-26 20:22:48] thread 1: 2097152 hashes, 1742 khash/s
[2015-04-26 20:22:48] thread 2: 2097152 hashes, 1355 khash/s
[2015-04-26 20:23:54] thread 2: 81299404 hashes, 1230 khash/s
[2015-04-26 20:24:05] thread 1: 104547880 hashes, 1354 khash/s
[2015-04-26 20:24:13] thread 3: 108821800 hashes, 1272 khash/s
[2015-04-26 20:24:25] thread 0: 106421736 hashes, 1095 khash/s
[2015-04-26 20:25:01] thread 2: 73787712 hashes, 1102 khash/s
[2015-04-26 20:25:07] thread 1: 81252652 hashes, 1312 khash/s
[2015-04-26 20:25:14] thread 3: 76317796 hashes, 1256 khash/s
[2015-04-26 20:25:27] thread 0: 65677172 hashes, 1051 khash/s
[2015-04-26 20:25:52] thread 2: 66108472 hashes, 1305 khash/s
[2015-04-26 20:26:12] thread 3: 75386708 hashes, 1307 khash/s
[2015-04-26 20:26:15] thread 1: 78701868 hashes, 1152 khash/s
[2015-04-26 20:26:28] thread 0: 63037412 hashes, 1031 khash/s
</code></pre>

<p>The problem I have now, is that I never get any output like this:</p>

<pre><code>[&lt;Date&gt;, &lt;Time&gt;] accepted: x/y (x/y%), &lt;bla&gt;khash/s (yay!!!)
</code></pre>

<p>and in the mining pool, I dont see my worker online.</p>

<p>I wonder now, if my computer does any work at all, or if it is just too slow and all the work it puts into mining goes to waste.</p>
 24925: <p>You are mining, but most pools today have a minimum share difficulty requirement, otherwise very fast miners bombard them with shares that they have to process and discard. For many pools this is at a minimum of 128 or higher, meaning it would take several days for a CPU miner to find a share on average. No pool has a payout of any less than 0.00001 BTC, so there is absolutely no chance of you ever being paid for your work if you are mining using a CPU or GPU at this point in time. </p>
