I installed the TinyOS in the 64-bit version of Ubuntu 12.04LTS, but the final compilation was successful, but all the Java tools were not available. This time I re-installed a 32-bit Ubuntu system. This is sure to be installed.But I found an error after I finished installing all the tutorials.When make TELOSB,> mkdir-p BUILD/TELOSB > Compiling BLINKAPPC to a TELOSB binary > Ncc-o build/telosb/main.exe-os-o-mdisable- hwmul-fnesc-separator=__ >-wall-wshadow-wnesc-all-target=telosb-fnesc-cfile=bui
Scenario ProblemsA common example in our daily life is assembling a computer. When assembling a computer, we usually need to select a series of accessories, such as CPU, hard disk, memory, motherboard, power supply, and chassis. For the sake of simplicity, we only need to consider the choice of CPU and motherboard.
In fact, when selecting a CPU, there are a series of problems, such as the brand, model, number of pins, and clock speed. Only by determin
way, each device is selected in turn, and a large amount of data between the device and the aging system is transmitted through parallel bus. The limitation of this method is that the selected device must overcome the capacitive and inductive loads of the aging board and other unselected devices, which may reduce the data transmission speed of the device on the bus.‧ Single-pin signal returnIn this method, all devices are connected in parallel, except that each device has a signal return pin, a
system ("cd"). Here, it mainly refers to the consumption of sub-processes in the system mode. The test1 program cannot reflect this.(2) The second consumption of 0.180000 seconds is two clock () function calls divided by clocks_per_sec.(3) The Clock () function returns a relative time instead of an absolute time.(4) clocks_per_sec is a system-Defined Macro defined by the GNU standard library as 1000000.
2) times () Time Functions
1) Overview:
The prototype is as follows:Clock_t times (struct
, int value);
The function of the parameter is the same as that of getpriority.
The value of the value is added to the default value of nice NZERO. Set this value to the new nice value.
4. Process Times)
The process time includes wall time (wall clock tie), user CPU time (user CPU time), and kernel CPU time (system CPU time ).
Function times can obtain these three time periods.
Function declaration:
#include clock_t times(struct tms *buf);
Function de
1. PrefaceTest the execution time of a program, including user CPU time, system CPU time, and clock time. Before the time is obtained before the main function of the program is implemented with the time function, this can only roughly calculate the program execution times, can not accurately get other time. When watching "Apue", the book about the program time test procedures, very formal, provide these three time. If so, search the internet for a moment and summarize it.2. How to obtainThere ar
client time is definedif (now==undefined) {now = new Date (). GetTime ();}var TMS = enddate-now;//Get time differenceif (tms$.oaotime.timers.push ({tms:c,content:$ ( This)}); $.oaotime.start (); }); }}); //Countdown Plug- in$.oaotime={ //countdown container, all need to countdown time to register to this container, in the container is a object,object describes the countdown end time, and
//malloc to use, if not, there will be a warning message: An implicit declaration is incompatible with the built-in function ' malloc '. But the warning message is fine .#include #include int main (){float time_use=0;struct Timeval start;struct Timeval end;struct timezone tz; It's explained later.Gettimeofday (start,null); Gettimeofday (start,tz);printf ("start.tv_sec:%d\n", start.tv_sec);printf ("start.tv_usec:%d\n", start.tv_usec);Sleep (3);Gettimeofday (end,null);printf ("end.tv_sec:%d\n", e
Circuit bridge-chip contact with wire to the pin of the package shell, These pins also connect to other devices through the wires on the printed circuit board. As a result, encapsulation technology is a critical part of many integrated circuit products.At present, the CPU is packaged with insulating plastic or ceramic material, can play the role of sealing and improving the electric performance of the chip. As the processor chip's internal frequency
Simple programs can be implemented through commands
[Plain]# Time./testReal 0m2. 033 sUser 0m2. 032 sSys 0m0. 000 s
# Time./test
Real 0m2. 033 sUser 0m2. 032 sSys 0m0. 000 s
If the time command is not convenient, you can use system functions.
[Cpp]# Include // The user obtains the user time and system time.Static struct tms tms_start;Static struct tms tms_end;// Used to get the clock-up timeStatic clock_t c
2 million takes approximately 10 seconds to output the result to a TXT file.
Sub GetPassword () ' by Kagawa
Dim I, J, K, L, M, N, R, S $, s1$, s2$, t$, C1, C2, Cnt, tms#
TMS = Timer
m = ActiveCell
If m = 0 Then M = 2 * 10 ^ 6
n = 6
s = "abc2def3hjk4lm5npq7rst8uvw9xyz" ' primitive characters deliberately break numbers evenly into letters
S1 = "2345789" ' Only number
S2 = "abcdefhjkl
value using the function setpriority.function declaration:
#include
int setpriority (int which, id_t who, int value);
The function of the parameter is the same as getpriority.Value is added to the Nice default value of Nzero, and the value is set to the new nice value.4 Progress time (process times)The process time includes: The Wall time (wall clock tie), the user CPU time, the kernel CPU time (System CPU times).The function times can get these three kinds of time.function d
1. Dip dual-row direct insert Encapsulation
Dip (dualin-line package) is an integrated circuit chip encapsulated in the form of Dual-row direct insertion. Most small-and medium-sized Integrated Circuits (IC) use this encapsulation form, generally, the number of pins cannot exceed 100. The CPU chip in dip package has two pins and needs to be inserted into the chip socket with dip structure. Of course, it c
= user_indexes.table_nameOrder by user_indexes.table_type, user_indexes.table_name,User_indexes.index_name, column_position;
6. Monitor SGA hit rate
Select a. Value + B. Value "logical_reads", C. Value "phys_reads ",Round (100 * (A. Value + B. Value)-C. Value)/(A. Value + B. Value) "buffer hit ratio"From v $ sysstat A, V $ sysstat B, V $ sysstat CWhere a. Statistic # = 38 and B. Statistic # = 39And C. Statistic # = 40;
7. Monitor the hit rate of the Dictionary Buffer in SGA
Select parameter, ge
JAVA design pattern-abstract factory pattern
The previous chapter describes the factory method model. We know that there is only one abstract Product role in the factory method model, and the specific factory role corresponds to the specific product role one by one.
The difference between Abstract Factory roles and specific factory roles today is that abstract factory roles can have multiple abstract product roles, and each abstract Product role can have multiple specific product roles,
The stru
number.
B. The ram resource is 400K-3888Kbit. Note that the size of the ram block is 9 Kbit. Some modules, such as fifo, actually do not use 9 K resources. However, no matter how much you use, you have to use one ram (in some cases, 0.5 ram is used ). Therefore, consider whether the number of ram instances is sufficient.
C. The number of multiplier numbers is 23. Note that it is a 18*18 bit multiplier. In actual use, it depends on the multiplier precision required by the application.
D. The num
1. Scenario Simulation
Take a common example in our daily life: when assembling a computer, we usually need to select a series of accessories. For example, when selecting a CPU, pay attention to the brand, model, and number of pins, clock speed. Only when these values are determined can a CPU be determined. The same is true for the motherboard. For the installation engineer, he only knows that the relevant accessories are required to install a compute
processing of a media type.
Pins:A pin is an interface in itself, and every filter must implement at least one pin (The Pin itself is an interface, and each filter must implement at least one pin ). pins are a way for filters to talk to other filters (pins are a method for linking filters ). typically, a filter might have an input pin and an output pin (typically, a filter may have an input pin and an outp
knitting two-pin positive, two-pin reverse, the end of the needle collection. A total of 8 flowers. 20 Stitches per Flower:First row: Two pins, 6 pins, two pins, two pins, two pins, 6 stitches.Second row: Two pin, 5 pin, two pin, 4 pin, two pin, 5 pin.Third row: Two pin, 4
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