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Selenium WebDriver: Wait for complex page with JavaScript to load
...bserve its behaviour and track some of its variables on window or document etc. This solution, however, is not for everyone and can be used only by you and only on a limited set of pages.
Your solution by observing the HTML code and whether it has or hasn't been changed for some time is not bad (als...
Should I use Vagrant or Docker for creating an isolated environment? [closed]
...ctivity benefits:
Vagrant can launch VirtualBox, VMware, AWS, OpenStack, etc. machines. It doesn't matter what you need, Vagrant can launch it. If you are using Docker, Vagrant can install Docker on any of these so you can use them for that purpose.
Vagrant is a single workflow for all your projec...
What is a good regular expression to match a URL? [duplicate]
... a bit more info on the comment by @RubenMartinezJr. - it does max out the CPU on Chrome and Firefox (Mac OS), but interestingly does not max out the CPU on Safari.
– rinogo
Nov 9 '17 at 14:46
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Why does JPA have a @Transient annotation?
...ystem uses tools to generate entities from database. (Hibernate has those, etc...)
Now, suppose that by your business logic you need a particular field NOT to be persisted. You have to "configure" your entity in a particular way.
While Transient keyword works on an object - as it behaves within a j...
Increasing the maximum number of TCP/IP connections in Linux
... eth0 txqueuelen 5000
echo "/sbin/ifconfig eth0 txqueuelen 5000" >> /etc/rc.local
Similarly bump up the values for net.core.netdev_max_backlog and net.ipv4.tcp_max_syn_backlog. Their default values are 1000 and 1024 respectively.
sysctl net.core.netdev_max_backlog=2000
sysctl net.ipv4.tcp_m...
When and why are database joins expensive?
...ires retrieval of only the keys. In practice, not even the key values are fetched: the key hash values are used for join comparisons, mitigating the cost of multi-column joins and radically reducing the cost of joins involving string comparisons. Not only will vastly more fit in cache, there's a lot...
Debug vs. Release performance
...oven to be invariants
code written under #debug directive is not included, etc.
The rest is up to the JIT.
Full list of optimizations here courtesy of Eric Lippert.
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What is the difference between concurrent programming and parallel programming?
...O bound but not always, e.g. concurrent garbage collectors are entirely on-CPU. The pedagogical example of a concurrent program is a web crawler. This program initiates requests for web pages and accepts the responses concurrently as the results of the downloads become available, accumulating a set ...
How to check if a file is a valid image file?
...more about it than just the format, like bitmap dimensions, format version etc.. So you might see this as a superficial test for "validity".
For other definitions of "valid" you might have to write your own tests.
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What integer hash function are good that accepts an integer hash key?
...tegers that are divisible by a common factor (word-aligned memory adresses etc.). Now if your hash table happens to be divisible by the same factor, you end up with only half (or 1/4, 1/8, etc.) buckets used.
– Rafał Dowgird
Mar 20 '09 at 16:56
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