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Best practices for in-app database migration for Sqlite
...ng stringWithFormat:@"userdata.sqlite"];
_database = [[FMDatabase alloc] initWithPath:[documentsDir stringByAppendingPathComponent:databaseName]];
_database.logsErrors = YES;
if (![_database openWithFlags:SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | SQLITE_OPEN_FILEPROTECTI...
Spark java.lang.OutOfMemoryError: Java heap space
...
I suffered from this issue a lot when using dynamic resource allocation. I had thought it would utilize my cluster resources to best fit the application.
But the truth is the dynamic resource allocation doesn't set the driver memory and keeps it to its default value, which is 1G.
I res...
Virtual functions and performance - C++
...s 1st level cache with more memory than my first computer had? Not at all. Allocating memory from main RAM will cost you more time than if all your functions were virtual.
Its like the old, old days where people said structured programming was slow because all the code was split into functions, eac...
Reading a string with scanf
...ld take it then that this would not be the case with a pointer to a string allocated through malloc()?
– abeln
Mar 23 '11 at 15:04
4
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How to free memory in Java?
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Java uses managed memory, so the only way you can allocate memory is by using the new operator, and the only way you can deallocate memory is by relying on the garbage collector.
This memory management whitepaper (PDF) may help explain what's going on.
You can also call Sy...
What is the difference between `new Object()` and object literal notation?
...re there are differences between the two syntaxes when you get into memory allocation.
– newshorts
May 20 '15 at 0:29
2
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Is there a performance difference between a for loop and a for-each loop?
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There is the performance penalty of allocating the iterator. I had some highly parallel code in an Android live wallpaper. I saw that the garbage collector was going crazy. It was because for-each loops were allocating temporary iterators in many different (sho...
in iPhone App How to detect the screen resolution of the device
...it with the screen size of the iOS device
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Set the initial view controller to be the root view controller of the window object
self.window.rootViewController = initialViewController;
/...
How do I use a custom deleter with a std::unique_ptr member?
...d up with UB if the pointer passed into std::unique_ptr<Bar> was not allocated from create(), but from some other allocation function.
– Justin
Jul 10 '18 at 20:18
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Why do I get a segmentation fault when writing to a “char *s” initialized with a string literal, but
... the size of str in the second example will show you that the compiler has allocated 7 bytes for it:
printf("%d", sizeof(str));
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