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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...n your cache. L is always power of 2.
The six comes from fact that 2^6 == 64 bytes is standard size of cache line.
Now what does this mean? Well it means that if I have address X and address Y and
(X >> 6) - (Y >> 6) is divisible by L (i.e. some large power of 2), they will be stored ...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
... I need to limit the ability of the token to be guessed. Because uniqid is based on the time, and according to php.net "the return value is little different from microtime()", uniqid does not meet the criteria. PHP recommends using openssl_random_pseudo_bytes() instead to generate cryptographically ...
How to retrieve a file from a server via SFTP?
...ns HttpClient, amongst others.
It supports both user/pass and certificate-based logins nicely, as well as all a whole host of other yummy SSH2 features.
Here's a simple remote file retrieve over SFTP. Error handling is left as an exercise for the reader :-)
JSch jsch = new JSch();
String knownH...
What is the runtime performance cost of a Docker container?
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Here's some more benchmarks for Docker based memcached server versus host native memcached server using Twemperf benchmark tool https://github.com/twitter/twemperf with 5000 connections and 20k connection rate
Connect time overhead for docker based memcached seem...
Why should a Java class implement comparable?
...aim majority of interfaces are consumed by the user's code. In larger code bases, "yourself" quickly becomes "others"
– Enno Shioji
May 2 '17 at 6:01
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Can you use if/else conditions in CSS?
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You could create two separate stylesheets and include one of them based on the comparison result
In one of the you can put
background-position : 150px 8px;
In the other one
background-position : 4px 8px;
I think that the only check you can perform in CSS is browser recognition:
Cond...
View contents of database file in Android Studio
...devices to get the list of your devices
C:\Android\adt-bundle-windows-x86_64\sdk\platform-tools>adb devices
List of devices attached
emulator-xxxx device
3- Connect a shell to your device:
C:\Android\adt-bundle-windows-x86_64\sdk\platform-tools>adb -s emulator-xxxx shell
4- Navigate to...
How to use npm with node.exe?
...2-02-20) will install NPM along with NodeJS.
NOTES:
At this point, the 64-bit version is your best bet
The install path for 32-bit node is "Program Files (x86)" in 64-bit windows.
You may also need to add quotes to the path statement in environment variables, this only seems to be in some cases ...
ExecJS::RuntimeError on Windows trying to follow rubytutorial
...oesn't appear to work at first, make sure you try that! I'm on windows 8 64-bit, and it worked for me! Thanks
– Peter Kirby
Apr 11 '13 at 1:24
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Javascript calculate the day of the year (1 - 366)
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The day component is base-1. i.e. to represent January 1st of this year, you'd use new Date(2014, 0, 1), and not new Date(2014, 0, 0) as you have here. Is that intentional? Perhaps that's what accounts for being off by one day as new Date(2014...