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理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...息：
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Out of memory: Kill process 9682 (mysqld) score 9 or sacrifice child
Killed process 9682, UID 27, (mysqld) total-vm:47388kB, anon-rss:3744kB, file-rss:80kB
httpd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
httpd cpuset=/ mems_allowed=0
Pid: 8911...
find -exec a shell function in Linux?
...has a couple of pitfalls that are easily overcome:
find . -print0 | while IFS= read -r -d '' file; do dosomething "$file"; done
This uses null as a delimiter instead of a linefeed, so filenames with linefeeds will work. It also uses the -r flag which disables backslash escaping, without it backs...
jQuery Ajax File Upload
...ssible through AJAX.
You can upload file, without refreshing page by using IFrame.
You can check further details here.
UPDATE
With XHR2, File upload through AJAX is supported. E.g. through FormData object, but unfortunately it is not supported by all/old browsers.
FormData support starts from f...
What is an abstract class in PHP?
...nd non-abstract methods, but it must contain at least one abstract method. If a class has at least one abstract method, then the class must be declared abstract.
Note: Traits support the use of abstract methods in order to impose requirements upon the exhibiting class.
Example below :
class ...
Heroku free account limited?
...yno is an instance of your application running and responding to requests. If each instance of your application can serve each request in 100ms, then you get 600 requests/minute with the free account.
Your application code and its assets (the slug) are limited to 300 MB in total. Your application a...
How to make link look like a button?
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This only works for me if I apply it to a tag directly (a {display: block ...}), which is not acceptable. Do you have any idea why class attribute inside a tag won't work? :( I'm using Firefox 27. I also tried a.button {...} and it doesn't work eit...
How do I find the number of arguments passed to a Bash script?
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To clarify: unlike argc in C-like languages, $# will be 0 if there are no arguments passed to the script, 1 if there is one argument, etc.
– Vladimir Panteleev
Dec 8 '14 at 11:55
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How to pass JVM options from bootRun
...roxy.
I use "Spring Boot" gradle plugin and the question is how can I specify proxy settings for JVM?
7 Answers
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Erlang's 99.9999999% (nine nines) reliability
...s that the service provided by the AXD301 system was ever offline. Subtle difference. As Joe Armstrong says here:
The AXD301 has achieved a NINE nines reliability (yes, you read that right, 99.9999999%). Let’s put this in context: 5 nines is reckoned to be good (5.2 minutes of downtime/year). 7 n...
Explanation of the UML arrows
...0%29.aspx
5: Association: A relationship between the members of two classifiers.
5a: Aggregation: An association representing a shared ownership relationship. The
Aggregation property of the owner role is set to Shared.
5b: Composition: An association representing a whole-part relationship. The Ag...