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What do the return values of node.js process.memoryUsage() stand for?
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[rss, heapTotal, heapUsed] => size in megabytes? kilobytes? can you add that to your answer? are they all the same units?
– Alexander Mills
Mar 6 '18 at 1:13
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What exactly is Python's file.flush() doing?
...uffers
Operating system buffers
The internal buffers are buffers created by the runtime/library/language that you're programming against and is meant to speed things up by avoiding system calls for every write. Instead, when you write to a file object, you write into its buffer, and whenever the b...
What is the difference between pip and conda?
...ip cannot install the Conda package format. You can use the two tools side by side (by installing pip with conda install pip) but they do not interoperate either.
Since writing this answer, Anaconda has published a new page on Understanding Conda and Pip, which echoes this as well:
This highlig...
Most underused data visualization [closed]
...data. Heat maps can be useful for this. One really neat one was featured by David Smith on the Revolutions blog. Here is the ggplot code courtesy of Hadley:
stock <- "MSFT"
start.date <- "2006-01-12"
end.date <- Sys.Date()
quote <- paste("http://ichart.finance.yahoo.com/table.csv?s="...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...ache misses with matice2 either.
Now to go deeper in how caches works, if byte address of your variable is X, than the cache line for it would be (X >> 6) & (L - 1). Where L is total number of cache lines in your cache. L is always power of 2.
The six comes from fact that 2^6 == 64 bytes...
Which iomanip manipulators are 'sticky'?
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Important notes from the comments below:
By Martin:
@Chareles: Then by this requirement all manipulators are sticky. Except setw which seems to be reset after use.
By Charles:
Exactly! and the only reason that setw appears to behave differently is beca...
What's the difference between libev and libevent?
...d didn't cope well with time jumps.
Libev tried to improve each of these, by not using global variables but using a loop context for all functions, by using small watchers for each event type (an I/O watcher uses 56 bytes on x86_64 compared to 136 for libevent), allowing extra event types such as t...
Aggregate function in an SQL update query?
...INNER JOIN (select field3, sum(field2) as field2Sum
from table2
group by field3) as t2
on t2.field3 = t1.field3
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Set Django IntegerField by choices=… name
...an readable names. Is there in Django a convenient way to set these fields by the human readable name instead of the value?
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How can I negate the return-value of a process?
... not command
The '!' operator, whether built-in to your shell or provided by the o/s, is not universally available. It isn't dreadfully hard to write, though - the code below dates back to at least 1991 (though I think I wrote a previous version even longer ago). I don't tend to use this in my sc...