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Optimal number of threads per core
...eally parallelizable, so I can run chunks of it on an infinite number of threads and each thread takes the same amount of time.
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Seeing the console's output in Visual Studio 2010?
...ink for abit more info social.msdn.microsoft.com/Forums/en/csharpgeneral/thread/…
– Richard Adnams
Mar 14 '11 at 16:22
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How can I read a function's signature including default argument values?
Given a function object, how can I get its signature? For example, for:
8 Answers
8
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Longest line in a file
...l commands. Takes filename as first argument:
#!/bin/sh
MAX=0 IFS=
while read -r line; do
if [ ${#line} -gt $MAX ]; then MAX=${#line}; fi
done < "$1"
printf "$MAX\n"
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COUNT DISTINCT with CONDITIONS
... be included in count.
One thing to note here is that this can be done by reading the table once. When it seems that you have to read the same table twice or more, it can actually be done by reading once, in most of the time. As a result, it will finish the task a lot faster with less I/O.
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ALTER TABLE without locking the table?
When doing an ALTER TABLE statement in MySQL, the whole table is read-locked (allowing concurrent reads, but prohibiting concurrent writes) for the duration of the statement. If it's a big table, INSERT or UPDATE statements could be blocked for a looooong time. Is there a way to do a "hot alter", li...
What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)?
I have a Map which is to be modified by several threads concurrently.
19 Answers
19
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how to listen to N channels? (dynamic select statement)
...h approaches presented so far given the same input, a slice of channels to read from and a function to call for each value which also need to know which channel the value came from.
There are three main differences between the approaches:
Complexity. Although it may partially be a reader preferen...
Java FileReader encoding issue
I tried to use java.io.FileReader to read some text files and convert them into a string, but I found the result is wrongly encoded and not readable at all.
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How do I remove/delete a folder that is not empty?
...erence: shutil.rmtree.
By design, rmtree fails on folder trees containing read-only files. If you want the folder to be deleted regardless of whether it contains read-only files, then use
shutil.rmtree('/folder_name', ignore_errors=True)
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