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How should strace be used?
...ster than GDB because it looks up errno codes for you, e.g. -EFAULT (oops, read-only buffer) or -ENOENT (oops, ran from the wrong directory where the relative path didn't work).)
– Peter Cordes
Apr 9 '19 at 6:50
...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...r the cases when an approximation suffices, but speed is required. If you read Intel's documentation, you will also find an instruction sequence (reciprocal square-root approximation followed by a single Newton-Raphson step) that gives nearly full precision (~23 bits of accuracy, if I remember prop...
How to refer to relative paths of resources when working with a code repository
...em using a different path separator in the future and want your code to be ready for it, os.pardir will be more portable. I'd make the case that every programmer, even one who never read any python knows the meaning of "..", while "os.pardir" is a level o f indirection one would have to look up in t...
Measure the time it takes to execute a t-sql query
...r doc on how to do this but couldn't find doc that didn't require hours of reading. Can you recommend a "Profiler for Dummies" link?
– TheMoot
Jul 26 '12 at 18:05
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Changing MongoDB data store directory
...path parameter in MongoDB will allow you to control what directory MongoDB reads and writes it's data from.
mongod --dbpath /usr/local/mongodb-data
Would start mongodb and put the files in /usr/local/mongodb-data.
Depending on your distribution and MongoDB installation, you can also configur...
HashMap with multiple values under the same key
...ple.add(new Person("Bob Jones"));
peopleByForename.put("Bob", people);
// read from it
List<Person> bobs = peopleByForename["Bob"];
Person bob1 = bobs[0];
Person bob2 = bobs[1];
The disadvantage with this approach is that the list is not bound to exactly two values.
2. Using wrapper class
...
How can I get around MySQL Errcode 13 with SELECT INTO OUTFILE?
...etc/init.d/apparmor reload
WARNING: the change above will allow MySQL to read and write to the /data directory. We hope you've already considered the security implications of this.
share
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improve...
Detecting an undefined object property
... it had accidentally been redefined. In modern JavaScript, the property is read-only.
However, in modern JavaScript, "undefined" is not a keyword, and so variables inside functions can be named "undefined" and shadow the global property.
If you are worried about this (unlikely) edge case, you can...
How do I rename an open file in Emacs?
...
(if (get-buffer new-name)
(message "A buffer named '%s' already exists!" new-name)
(progn
(rename-file filename new-name 1)
(rename-buffer new-name)
(set-visited-file-name new-name)
(set-buffer-modified-p nil))))))
Take a look at tha...
Go to particular revision
...the branch name. (See Treeishes in the Git Community Book, which is a good read, to see other options for navigating your tree.)
git log has a whole set of options to display detailed or summary history too.
I don't know of an easy way to move forward in a commit history. Projects with a linear hi...