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comment Why does ping -f act like this?
@TrevorClarke: The domain name on the first screenshot is clearly OP's own website, so I'd give the OP benefit of the doubt and assume he is stress-testing his own website. Also note that my answer explains the use of stock-standard Linux tools, not that I'm instructing him how to set up a network of zombie machines to perform a real DDoS attack...
2d
answered Why does ping -f act like this?
Jan
20
comment Convert thousands of .pngs to animated .gif, `convert` uses too much memory
Another consideration is the memory requirements for the resulting GIF: I would expect it to require N x width x height x number of frames (where N is either 1 or 4, more likely 4), so, again, a 1024x768x1000 frames GIF would likely require ~3Gb of RAM to display. The actual filesize would be much less of course.
Jan
20
answered Convert thousands of .pngs to animated .gif, `convert` uses too much memory
Jan
20
comment Convert thousands of .pngs to animated .gif, `convert` uses too much memory
Re. "where all the memory is going": 65 Kb is the file size of a compressed image. When uncompressed, the image takes roughly 4 x width x height bytes, so a 1024x768 image would take ~3Mb of RAM. Multiply that by "a few thousand" and you'll see where the memory is going...
Jan
2
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Nov
10
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Nov
10
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Oct
16
awarded  Nice Answer
Oct
15
comment Difference between “su”, “sudo -s”, “sudo -i”
@Whaaaaaat: well, it's similar, although I'm not sure if there are any differences related to login shell, environment etc.
Oct
15
comment Difference between “su”, “sudo -s”, “sudo -i”
@Whaaaaaat: I've added a paragraph to my answer
Oct
15
revised Difference between “su”, “sudo -s”, “sudo -i”
added 418 characters in body
Oct
14
comment Does using -v (verbose) slow commands down?
The most impact, and probably the only case where it would really matter, is when you run the command on a remote machine via SSH. Verbose logging may easily generate tens of megabytes of traffic which would have to be transmitted from the host to your console. I once experienced a speedup in order of 10x after removing excessive console logging from a script which I ran via SSH.
Oct
4
awarded  Notable Question
Oct
1
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Oct
1
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Sep
30
answered Unity configure a desktop to occupy only part of the physical screen
Sep
30
awarded  Explainer