大约有 40,000 项符合查询结果（耗时：0.0319秒） [XML]
Context switches much slower in new linux kernels
...to zero, hopefully disabling it as well. I do not have a system that I can test this on, because intel_idle.max_cstate=0 completely knocks out the cpuidle driver on all of the hardware available to me. However, if your installation does revert you from intel_idle to acpi_idle with just the first boo...
How to check if an NSDictionary or NSMutableDictionary contains a key?
... = [[NSMutableDictionary alloc] init];
keysByName[@"fred"] = @1;
NSString* test = @"fred";
if ([keysByName objectForKey:test] != nil)
NSLog(@"\nit works for key lookups"); // OK
else
NSLog(@"\nsod it");
if (keysByName[test] != nil)
NSLog(@"\nit works for key lookups using indexed synt...
Split column at delimiter in data frame [duplicate]
...),
+ bar=c('p|q', 'r|s', 's|t'), stringsAsFactors=F)
> transform(df, test=do.call(rbind, strsplit(foo, '|', fixed=TRUE)), stringsAsFactors=F)
id foo bar test.1 test.2
1 1 a|b p|q a b
2 2 b|c r|s b c
3 3 c|d s|t c d
Multiple columns:
> transform(df, lapp...
How to set child process' environment variable in Makefile
...ault. However you can use make's export to force them to do so. Change:
test: NODE_ENV = test
to this:
test: export NODE_ENV = test
(assuming you have a sufficiently modern version of GNU make >= 3.77 ).
share
...
Convert XLS to CSV on command line
... is not limited to xls at all. xlsx Works just fine, as we could expect.
Tested with Office 2010.
share
|
improve this answer
|
follow
|
...
Nginx url重写rewrite实例详解 - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...访问如下：
server {
listen 80;
server_name www.test.com;
location / {
root /data/test;
index index.html;
}
}
server {
listen 80;
server_name *.test.com;
if ( $http_host ~* "^(.*)\.test\.com$") ...
Completion handler for UINavigationController “pushViewController:animated”?
...
I believe (haven't tested) that this could provide inaccurate results if the presented view controller triggers animations inside it's viewDidLoad or viewWillAppear implementations. I think those animations will be started before pushViewContr...
Using forked package import in Go
... a tiny feature to a library I am using when I ran into this headache with testing it before creating a Pull Request.
– Joakim
Jul 18 '16 at 16:20
add a comment
...
Does use of final keyword in Java improve the performance?
...le below are concatenated statically (at compile time).
public class FinalTest {
public static final int N_ITERATIONS = 1000000;
public static String testFinal() {
final String a = "a";
final String b = "b";
return a + b;
}
public static String testNonFina...
Show pending migrations in rails
...ere is an example of the output after having just generated and not run a 'test' migration
rails_project theIV$ rake db:abort_if_pending_migrations
(in /Users/theIV/Sites/rails_project/)
You have 1 pending migrations:
20090828200602 Test
Run "rake db:migrate" to update your database then try agai...