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闲扯Nginx的accept_mutex配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...相关的解释：
OS may wake all processes waiting on accept() and select(), this is called thundering herd problem. This is a problem if you have a lot of workers as in Apache (hundreds and more), but this insensible if you have just several workers as nginx usually has. Therefore turning acc...
SQL: How to get the count of each distinct value in a column?
...
SELECT
category,
COUNT(*) AS `num`
FROM
posts
GROUP BY
category
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Delete newline in Vim
...
You can also select all the lines you want to join using V (Visual Line Mode) then press J or gJ
– Sbu
Jan 24 '17 at 6:13
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Rails Migration: Remove constraint
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This should be the selected answer
– nahtnam
Aug 9 '19 at 17:50
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How to make phpstorm display line numbers by default?
...er - right click on the long white column (where breakpoints are set) then select Show Line Numbers.
Red dot on the screenshot is a place where you have to click
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AngularJS : automatically detect change in model
...s model being deep dirty-checked, possibly multiple times). In that case, selective $watch()es or selective ng-change would be better.
– Mark Rajcok
Mar 15 '13 at 3:57
add a ...
How to print register values in GDB?
...ax
# $1 = 0
set $eax = 1
p $eax
# $2 = 1
This syntax can also be used to select between different union members e.g. for ARM floating point registers that can be either floating point or integers:
p $s0.f
p $s0.u
From the docs:
Any name preceded by ‘$’ can be used for a convenience vari...
A non-blocking read on a subprocess.PIPE in Python
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fcntl, select, asyncproc won't help in this case.
A reliable way to read a stream without blocking regardless of operating system is to use Queue.get_nowait():
import sys
from subprocess import PIPE, Popen
from threading import T...
How to change the name of a Django app?
...ete the permissions: delete from auth_permission where content_type_id in (select id from django_content_type where app_label = '<OldAppName>')
Delete content types: delete from django_content_type where app_label = '<OldAppName>'
Rename the folder of the app.
Change any references to y...
Incorrect syntax near ')' calling stored procedure with GETDATE
...N
set @DateVar=ISNULL(@DateVar,GETDATE())
--the SP stuff here
SELECT @DateVar
END
GO
And then try:
EXEC DisplayDate '2013-02-01 00:00:00.000'
EXEC DisplayDate
Remark: Here I supposed that NULL value is not in use for this parameter. If it is not your case - you can use another unus...