Micro-coreThe bigger the system, the more potential bugs, so the microkernel has an advantage in reducing bugs, and seL4 is one of the smallest cores in the world. But the performance of seL4 can be compared with the best-performing micro-cores today.As a microkernel, SEL4 provides a small number of services to the application, such as the creation and management
SEL4 Specifies the platform that can be run and compiles it according to the following match.
ARCH
PLAT
ARMV
CPU
Arm
Imx31
ARMv6
Arm1136jf-s
Arm
Omap3
Armv7-a
Cortex-a8
Arm
am335x
Armv7-a
Cortex-a8
Ia32
Pc99
After cloning from GitHub to the project, do the following:If you encounter
:
Tar xzvf ruby-fcgi-0.8.7.tar.gz
CD ruby-fcgi-0.8.7
Ruby install.rb config----with-fcgi-include=/opt/modules/fcgi/include--with-fcgi-lib=/opt/modules/fcgi/lib
Ruby INSTALL.RB Setup
Ruby Install.rb Install
LIGHTTPD Installation:
Download Address: http://www.lighttpd.net/download/
Note: Check the Linux pcre before installing, the default installation of Pcre-4.5-3.2.rhel4 in Redhat, this version does not support LIGHTTPD.
Two additional rpm,grep-2.5.1-32.2.i386.rpm and pcre-devel-4.5-3.2.
function description (example: City field: ID (PK), belong_id (ID of the province), city (city name ))'''Colname_id: ID (used as the id value associated with the next menu)''Parameter colname_name: City (note that this is the field name)'''Table_name: City (note that this is the table name)''Parameter parentcol: It is belong_id (parent class Id field name)''Parameter belongparent: that is, sel1 (value from request)''The returned value is the encrypted value of escape (for example, id1, ID +" 2%
execution result is 0.0312.2.2 calculate the selection rate of several candidate lengths
Select count (DISTINCTLEFT (city, 3)/COUNT (*) AS sel3,
COUNT (distinct left (city, 4)/COUNT (*) AS sel4,
COUNT (distinct left (city, 5)/COUNT (*) AS sel5,
COUNT (distinct left (city, 6)/COUNT (*) AS sel6,
COUNT (distinct left (city, 7)/COUNT (*) AS sel7
FROM city_demo;
+ -------- +
| Sel3 | sel4 | sel5 | sel6 | sel7
+ iguana + magpie + wombat, iguana is similar to l4env, magpie is similar to dice, and wombat is similar to l4linux. 2) Security sel4 + l4.verified. I cannot tell the differences between the two projects. sel4 indicates Security embedded L4. In short, even if formal method is used to verify okl4 is secure kernel, it seems that they have reached the level of machine code verification. The general step is to
Http://microkerneldude.wordpress.com/2014/08/29/ok-labs-story-1-the-beginning/:
Note: Supplement to sel4 background
Last week, I promised to talk about the history of the open kernel lab. This is the first part.
It all started more than a decade ago. One morning I received a call from Kevin and he said he was an intellectual property lawyer at Qualcomm. When you know their nature, it will usually make your spine cooler. However, the conversation is
--Check the frequency of occurrenceSelect COUNT (*) as Cnt,cityFrom Sakila.city_demo GROUP by city ORDER by CNT DESC LIMIT 10;1.select count (Distinct city)/count (*) from Sakila.city_demo;* Selection of complete columns2. Select COUNT (distinct left (city,3))/count (*) as SEL3,COUNT (distinct left (city,4))/count (*) as SEL4,COUNT (distinct left (city,5))/count (*) as SEL5,COUNT (distinct left (city,6))/count (*) as SEL6,COUNT (distinct left (city,7)
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