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list.clear() vs list = new ArrayList(); [duplicate]
... one way holds onto memory, the other one throws out its memory and gets reallocated from scratch (with the default capacity). Which is better depends on whether you want to reduce garbage-collection churn or minimize the current amount of unused memory. Whether the list sticks around long enough to...
Large, persistent DataFrame in pandas
...(here's a tedious one: you could transcribe the file row-by-row into a pre-allocated NumPy array or memory-mapped file--np.mmap), but it's one I'll be working on in the near future. Another solution is to read the file in smaller pieces (use iterator=True, chunksize=1000) then concatenate then with ...
Move assignment operator and `if (this != &rhs)`
...ll you need to do is a memcpy (hidden under std::copy). You don't want to allocate a new array of the same size and then deallocate the old one of the same size!
Now for your clients who actually want strong exception safety:
template <class C>
C&
strong_assign(C& lhs, C rhs)
{
...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
... of the inserted record from the trigger.
IdentCurrent: The last identity allocated for the table.
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MySQL InnoDB not releasing disk space after deleting data rows from table
... 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
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What's the difference between unit tests and integration tests? [duplicate]
... They usually require resources like database instances and hardware to be allocated for them. The integration tests do a more convincing job of demonstrating the system works (especially to non-programmers) than a set of unit tests can, at least to the extent the integration test environment resemb...
Java String - See if a string contains only numbers and not letters
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If you look at the code of toCharArray, it is allocating a char array and copying the chars (i think that could be expensive). What about if you just iterate the string using an index and charAt, would it be faster? Would be interesting also if you could add the soluti...
Detect if a NumPy array contains at least one non-numeric value?
...really the fastest way to do this? i) Doesn't numpy.isnan(a).any() involve allocating a large temporary array (it is it a view). ii) If the first element is NAN, does this solution involve iterating over the full array? If I set the first element to NAN, this still takes about 5microseconds, which s...
Parsing HTML into NSAttributedText - how to set font?
... self.font.pointSize]];
self.attributedText = [[NSAttributedString alloc] initWithData:[string dataUsingEncoding:NSUnicodeStringEncoding]
options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
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Is it a bad practice to catch Throwable?
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How do you know what was allocated and what wasn't prior to the OOME? All bets are off once you get that, even inside a J2EE container like Tomcat or JBoss.
– bmauter
May 31 '13 at 2:05
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