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MongoDB与内存 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...先看一个MongoDB服务器的top命令结果：
shell> top -p $(pidof mongod)
Mem: 32872124k total, 30065320k used, 2806804k free, 245020k buffers
Swap: 2097144k total, 100k used, 2097044k free, 26482048k cached
VIRT RES SHR %MEM
1892g 21g 21g 69.6
这台MongoDB服务器...
Using msbuild to execute a File System Publish Profile
...t as
simple as invoking your project file with a particular target and
setting some properties. You’ll need to do what VS2010 ought to have
done: create a target yourself that performs the half-deploy then
copies the results to the target folder. To edit your project file,
right click on...
Getting number of elements in an iterator in Python
Is there an efficient way to know how many elements are in an iterator in Python, in general, without iterating through each and counting?
...
How to filter a dictionary according to an arbitrary condition function?
I have a dictionary of points, say:
7 Answers
7
...
Hiding textarea resize handle in Safari
...
What if I want to show it on hover after I've set resize:none ?
– Michael Forrest
Sep 24 '10 at 11:33
...
Making TextView scrollable on Android
...
You don't need to use a ScrollView actually.
Just set the
android:scrollbars = "vertical"
properties of your TextView in your layout's xml file.
Then use:
yourTextView.setMovementMethod(new ScrollingMovementMethod());
in your code.
Bingo, it scrolls!
...
程序员之网络安全系列（三）：数据加密之对称加密算法 - 更多技术 - 清泛网...
...ted, byte[] passwordBytes)
{
byte[] encryptedBytes = null;
// Set your salt here, change it to meet your flavor:
// The salt bytes must be at least 8 bytes.
byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
using (MemoryStream ms = new MemoryStream())
{
us...
Cutting the videos based on start and end time using ffmpeg
...hat way ffmpeg will skip directly to the location. However, that will also set the time "zero" to that location, meaning that -to will point to the wrong time. Source: trac.ffmpeg.org/wiki/Seeking
– Denilson Sá Maia
Jul 30 '15 at 19:41
...
“java.lang.OutOfMemoryError : unable to create new native Thread”
... thread problem. There's also an option called TasksMax (for more isolated settings) for services/systemd that are under [Service] TasksMax=(value). At SUSE, the default value is 512 (which is very limited for production use). More info suse.com/support/kb/doc/?id=000015901 systemctl daemon-reload,...
How do you use script variables in psql?
...
Postgres variables are created through the \set command, for example ...
\set myvariable value
... and can then be substituted, for example, as ...
SELECT * FROM :myvariable.table1;
... or ...
SELECT * FROM table1 WHERE :myvariable IS NULL;
edit: As of psql 9....