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Context switches much slower in new linux kernels
We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to belie...
How do I use a Boolean in Python?
... It is usually simpler to use checker=(some_decision) (e.g. checker=(a<b)), instead of an 'if'.
– MAK
Nov 17 '09 at 13:25
11
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Which is faster : if (bool) or if(int)?
...ol as an 8-bit value, and your system ABI requires it to "promote" small (< 32-bit) integer arguments to 32-bit when pushing them onto the call stack. So to compare a bool, the compiler generates code to isolate the least significant byte of the 32-bit argument that g receives, and compares it wi...
Undo changes in entity framework entities
...me! Only modification I made is to use the the generic version of Entries<T>() so that it works for my respositories. This gives me more control and I can roll back per entity type. Thanks!
– Daniel Mackay
Aug 17 '17 at 23:55
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Difference between break and continue statement
...
System.out.println ("starting loop:");
for (int n = 0; n < 7; ++n)
{
System.out.println ("in loop: " + n);
if (n == 2) {
continue;
}
System.out.println (" survived first guard");
if (n == 4) {
break;
}
System.out.println (" survived...
How to remove the first commit in git?
...commit history, and commit your new content on it:
git checkout --orphan <new-branch-name>
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What does “WARN Could not determine content-length of response body.” mean and how to I get rid of i
...0/lib/ruby/1.9.1/webrick/httpresponse.rb
The location of the file to be altered differs depending on the type of installation, RVM or not, or even multi-user or single user, so I'm just giving the last part of it:
.../ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpresponse.rb
I hope this can be help...
Downloading Java JDK on Linux via wget is shown license page instead
...value doesn't have to be "accept-securebackup-cookie".
Required for Wget<1.13
--no-check-certificate
Only required with wget 1.12 and earlier, which do not support Subject Alternative Name (SAN) certificates (mainly Red Hat Enterprise Linux 6.x and friends, such as CentOS). 1.13 was released...
Patterns for handling batch operations in REST web services?
...Just make use of a subresource.
POST /mail/0/markAsRead
POSTDATA: true
Alternatively, you could use parameterized resources. This is less common in REST patterns, but is allowed in the URI and HTTP specs. A semicolon divides horizontally related parameters within a resource.
Update several attri...
What is the copy-and-swap idiom?
...ward, the copy-assignment operator is arguably the most nuanced and difficult. How should it be done? What pitfalls need to be avoided?
The copy-and-swap idiom is the solution, and elegantly assists the assignment operator in achieving two things: avoiding code duplication, and providing a strong e...