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Custom thread pool in Java 8 parallel stream
...t;
// Parallel task here, for example
IntStream.range(1, 1_000_000).parallel()
.filter(PrimesPrint::isPrime)
.boxed().collect(Collectors.toList())
).get();
System.out.println(primes);
} catch (InterruptedException | ExecutionException e) {
...
What's the difference between JPA and Hibernate? [closed]
...
632
votes
JPA is the dance, Hibernate is the dancer.
...
Set default value of an integer column SQLite
....new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f17617610%2fset-default-value-of-an-integer-column-sqlite%23new-answer', 'question_page');
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Setting the Vim background colors
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How expensive is RTTI?
...
I was doing a quick test using this:
GCC Clock() + XCode's Profiler.
100,000,000 loop iterations.
2 x 2.66 GHz Dual-Core Intel Xeon.
The class in question is derived from a single base class.
typeid().name() returns "N12fastdelegate13FastDelegate1IivEE"
5 Cases were tested:
1) dynamic_cast< Fi...
Improve INSERT-per-second performance of SQLite
...formance of a C application can vary from 85 inserts per second to over 96,000 inserts per second!
10 Answers
...
Setting transparent images background in IrfanView
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Multiple Updates in MySQL
...6.7x faster for me than the TRANSACTION method. I tried on a set of both 3,000 and 30,000 rows.
The TRANSACTION method still has to run each individually query, which takes time, though it batches the results in memory, or something, while executing. The TRANSACTION method is also pretty expensive ...
java.util.regex - importance of Pattern.compile()?
...e() {
var before = Instant.now();
for (int i = 0; i < 1_000_000; i++) {
Pattern.compile("ab").matcher("abcde").matches();
}
System.out.println("recompile " + Duration.between(before, Instant.now()));
}
@Test
public void compileOnce() {
...
Or versus OrElse
...ocals init ([0] object a,
[1] int32 b,
[2] bool CS$4$0000)
IL_0000: nop
IL_0001: ldnull
IL_0002: stloc.0
IL_0003: ldc.i4.3
IL_0004: stloc.1
IL_0005: ldloc.0
IL_0006: ldnull
IL_0007: ceq
IL_0009: ldloc.0
IL_000a: callvirt instance string...