http://blog.csdn.net/unbutun/archive/2010/07/15/5738313.aspx spinlock use, as not quite understand the beginning of the development kernel module, a problem, debugging for many days, and later discovered that the lock code, the call to the kernel api
implementation, priority, long time, assumptions, sleep, linux, debugging, data structure, deadlock, kernel module, global data, worst case, core rules, critical areas, origin of the name, foreseeable future, spinlock, development kernel, kernel api, spinlocksJune 14
5.6.5 new_heap () New_heap () function is responsible for mapping a region of memory from mmap as sub_heap, in the 32-bit system, the function mapping every 1M of memory, the memory block address mapped by 1M alignment; in 64 for the system, the func
max size, lt 1, source code analysis, fragment, alignment, realization, memory management, different systems, 1m, heap size, atomicity, multiple threads, bit system, memory block, worst case, bit systems, block address, virtual address space, mmap, pad sizeMay 30
Analysis of the algorithm is incremental analysis, rather than as a precise mathematical analysis, so the need to memorize some common symbols O is the computational complexity of the upper bound function, the algorithm used to measure the complexity
lt, c function, worst case, algorithm analysis, optimal algorithm, computational complexity, mathematical analysis, incremental analysisMay 12
There are two basic ideas: 1. Algorithm is as follows: According to the quick thinking of sorting by (1) recursively for all the data into [a, b) b (b, d] two intervals, (b, d] is greater than the number of interval [a, b) the number of range (2) (b,
element, elements, algorithm, d2, piles, intervals, number 1, running time, step2, worst case, 100 million, time complexity, recursively, personal thoughts, top of the heap, interval 3, lgmMay 11
Original Source: http://playpcesor.blogspot.com/2011/05/lastpass.html , reprint please indicate the original source. LastPass official blog from the news Tuesday, U.S. time, when some of its servers LastPass detect suspicious traffic, to judge from t
blog, servers, original source, point of view, prevention, blogspot, email address, worst case, master password, high intensity, maste, security technology, account email, word vocabulary, ip section, converse, account management services, secret invasion, suspicious traffic, security notificationMay 6
Bubble Sort Quick sort is an improvement. It heap row method, Hill, like more efficient method, but somewhat less stable. For small arrays, the efficiency of commonly used sorting methods or less, but for large arrays, using the above method to sort
pointer, array element, critical data, array length, bubble sort, arrays, first choice, sorting algorithm, heap, key data, worst case, orderly sequence, time complexity, exchange 5, start x, nlogn, quick sort java, arbitrary data, case time, more efficient methodMay 6
Posted on July 25, 2010 by Jeremy Zawodny Following up on yesterday's 200,000,000 Keys in Redis 2.0.0-rc3 POST, which was a worst-case Test Scenario to see what the overhead for top-level Keys in Redis is, I decided to PUSH the boundaries in a Differ
key value, value pairs, test scenario, usr bin, boundaries, memory usage, 5b, slaves, int rand, process id, 00000000, worst case, 1 billion, case test, uptime, hash data, multiplexing, rc3, level keys, valsApril 26
A system of n printer, there are M processes to share printer resources, each process requires X units, when the value of M does not exceed _____ when the system does not deadlock ~ ~ The best answer when each process in the worst case: Each process
worst case, printers, deadlock situation, printer resource, printer resourcesMarch 31
hibernate.jdbc.fetch_size 50 hibernate.jdbc.batch_size 25 These two options are very, very important! ! ! The CRUD will seriously affect the performance of Hibernate! C = create, R = read, U = update, D = delete JDBC Fetch Size of the Statement is se
crud, batch size, oracle, databases, memory consumption, oracle database, performance increase, buffer size, access data, test result, hard disk, bulk insert, batch operation, jdbc drivers, performance improvement, write buffer, worst case, reading data, batch updatesJanuary 7
Medians and Order Statistics ------ Overview Order Statistics: Order statistics, that is ranked the number to find out n bits in the number of i, denoted by ith Medians: The median in the middle is the number of ------ Medians values Assuming all the
lt, amp, logic, efficiency, array, target, median, two persons, sequence number, worst case, statistic, time complexity, space complexity, order statistics, case time, introduction to algorithms, middle numbers, intermediate number, medians, ithJanuary 3
With JSP? Or use ASP? From the beginning of web technology to learn is to learn JSP, his open source, he thought, very enticing to me, there is now a number of occasions, make use of java, so learning web technology to chose to study JSP, very happy
quot, programming interface, occasions, open source, jsp, doubts, disdain, sleep, rapid development, technical personnel, six months, independent nature, e commerce website, web technology, learning java, worst case, control database, final answer, first exposureJanuary 1
B-tree: 1. All the leaf nodes at the same level 2. For the m-order B-tree, each internal node has ceil (m / 2) to m children, or a ceil (m / 2) -1 to m-1 A pairs. 3. Level ≤ log ceil (m / 2) (N +1) / 2, ceil (m / 2) is the subscript 4. Insert Delete
overflow, subscript, 2s, child nodes, data structure, ceil, parent node, root node, insertion point, worst case, leaf nodes, b tree, leaf node, internal node, access times, sibling nodes, disk accesses, splay operation, splay tree, amortizedDecember 14
1, select the map container, in order to more quickly find relevant keywords from the object. And use the container list than this linear form, one can simplify the search algorithm, the second can make any of the keywords to index, and paired with t
map, query time, search algorithm, efficiency, pairs, conflict, circumstances, processing time, target object, uncertainty, algorithm complexity, worst case, stl, tree search, computational complexity, relevant keywords, hash table lookup, table calculationsDecember 9
hibernate.jdbc.fetch_size 50 hibernate.jdbc.batch_size 25 These two options are very, very important! ! ! The CRUD will seriously affect the performance of Hibernate! C = create, R = read, U = update, D = delete JDBC Fetch Size of the Statement is se
crud, batch size, oracle, databases, memory consumption, oracle database, performance increase, buffer size, access data, test result, hard disk, bulk insert, batch operation, jdbc drivers, performance improvement, write buffer, worst case, reading data, batch updates, wheDecember 2
Search the web article, written almost all of it. Excerpt below for your reference learning 1 Introduction In Unix-like operating systems, syslog is widely used in the system log. syslog log messages can be recorded both in the local paper, can also
long time, log messages, protocol, host name, norms, excerpt, operating systems, log audit, process id, unified storage, severity, worst case, web article, security management system, program modules, network management tool, audit system, ietf, flexible features, syslog serverNovember 28
Search the web article, written by a very wide almost. Excerpt below for your reference learning 1 Introduction In Unix-like operating systems, syslog is widely used in the system log. syslog log messages can be recorded both in the local paper can a
log messages, protocol, host name, servers, elements, excerpt, operating systems, log audit, process id, severity, worst case, unix host, web article, program modules, network management tool, audit system, ietf, flexible features, security management systems, syslog serverNovember 28
Recommendation system estimates the direction after a large, widely used to customize the user or automatically personalized recommendations to improve the user experience. Recommended products like the Amazon home page, after the search recommendati
user experience, algorithm, scenarios, dimensional vector, amazon, commodities, commodity, vectors, collaborative filtering, worst case, product categories, recommended content, classification system, recommendation system, personal preferences, constellations, search recommendations, statistical measures, cosine similarity, sparsityNovember 21
Mediator means that intermediaries, regulators, transfer objects, by definition, the model in the program must pay an intermediary to regulate, transfer work. Object-oriented design, each object of the burdens simple as possible to encourage the dist
input field, existence, object oriented design, presence, coupling, interaction, worst case, intermediaries, mediator, burdens, polymer, digital content, example dialog, regulatorsNovember 13
MySQL query cache Starting from MySQL 4.0.1, MySQL server has one important feature: Query Cache. When in use, the query cache stores the text of a SELECT query sent to the client with the corresponding results. If the same after receiving a query, t
byte, web servers, mysql 4, cache size, configuration options, alpha 2, performance data, connection protocol, typical situation, worst case, query buffer, protocol format, server retrieves, line selection, stale data, cache performance, benchmark suite, table search, linux alpha, strict consensusOctober 23
At noon yesterday, was a company first despised, then there are two companies at the time the written conflict, and finally think about the, or whatever the X company (who face contempt to be a big risk), the results also appeared in the middle point
knowledge points, similarity, knowledge management, bubble sort, algorithm, insertion sort, examination questions, quick sort, tree traversal, worst case, time complexity, heap sort, test center, efficiency study, tree of knowledge, post order traversal, stability studySeptember 26
The first is at noon yesterday by a company despised, and then written at the time there is conflict in the two companies, and finally think about the, or go to the X Company (risk being despised to be a big risk), the results also appeared in the mi
knowledge points, efficiency, similarity, merger, stack, bubble sort, algorithm, insertion sort, queue, examination questions, quick sort, tree traversal, worst case, orderly sequence, time complexity, heap sort, diameter, test sites, initiate, tree of knowledgeSeptember 26
Order statistics Problem: Given n elements in an array, find the kth smallest element (rank k). The naive algorithm to solve this problem: sort the array A and return A [k]. If use heap sort or merge sort, requires Theta (nlgn) time. We can do better
lt 2, random numbers, running time, worst case, heap sort, t max, order statistics, linear time, quicksort, random variables, random variable, introduction to algorithms, naive algorithm, trivial caseSeptember 21
How fast can we sort? (Depends on the sorting model: what you can do with the elements) Comparison sorts: only use comparisons to determine relative order of elements: quicksort - Theta (nlgn) randomized version heapsort - Theta (nlgn) merge sort - T
lt 2, insertion sort, wikipedia, input element, running time, sorting algorithm, worst case, input elements, heap sort, permutations, stable sort, significant digits, linear time, case time, introduction to algorithms, decision tree model, herman hollerith, optimal comparison, temp storageSeptember 16
Lesson over 80 minutes, a long ah ... many things, but Professor Leiserson spoke fast and good! Quick sort (Quicksort) is CAR Hoare invented in 1960, when he was at Moscow University (Soviet Union, former Soviet Union bar) for visiting students. Nati
chinese version, array elements, many things, partition, running time, sorting algorithm, machine translation, quick sort, worst case, former soviet union, equivalents, leiserson, russian english dictionary, loop invariants, national physical laboratory, moscow university, visiting studentsSeptember 13
Slab Allocation Mechanism: order memory for reuse By default, memcached recently introduced a mechanism called the Slab Allocator distribution, management of memory. Prior to the advent of the mechanism, memory allocation is simply through all the re
cache memory, operating system, memory allocation, figure 1, memcached, basic principle, system memory, memory space, memory manager, memory block, release memory, worst case, memory fragmentation, page memory, distribution management, slab allocator, memory chunksSeptember 13
Today, the problems encountered an javaBean private String eName; public void setEName(String eName){ this.eName=eName; } Results of life and death error, and finally to setEName into seteName, actually just fine. . Internet is a bit javaBean naming
public void, naming convention, getter, getname, life and death, lower case, hump, two letters, default property, worst case, case letter, proper nouns, acronymsAugust 19
hibernate.jdbc.fetch_size and hibernate.jdbc.batch_size hibernate.jdbc.fetch_size 50 hibernate.jdbc.batch_size 25 These two options are very, very important! ! ! Will seriously affect the performance of Hibernate's CRUD! C = create, R = read, U = upd
crud, batch size, jdbc driver, oracle, databases, memory consumption, oracle database, database access, buffer size, batch operations, worst case, size characteristicsJuly 20
As far as I shall, hash table collision solutions are perfect hash list and two. List of shortcomings is the worst case o (n) time complexity. Perfect hash disadvantage is dynamically allocated space, and the worst case space complexity is o (n * n).
hash table, shortcomings, collisions, worst case, red black tree, time complexity, ln, space complexity, bucket sizeJuly 19
Given n elements, requires solution of which the first k elements of small, generally use the first sorted and then get the results directly to the process. In the case of a small amount of data no problem, time complexity is O (n * logn). But when a
import java, java util, parameters, arraylist, array, iteration, arrays, subset, algorithm design, graph, worst case, time complexity, 3n, recursive formula, logn, core ideas, linear time, time solution, case time, median timeJuly 11
Slab Allocation Mechanism: order memory for reuse By default, memcached recently introduced a mechanism called the Slab Allocator distribution, management of memory. Before the advent of the mechanism, memory allocation is through all the records sim
cache memory, memory allocation, figure 1, memcached, basic principle, system memory, memory space, memory manager, memory storage, memory block, release memory, worst case, chunk, memory fragmentation, slabs, page memory, distribution management, acco, slab allocator, memory chunksJuly 4
In addition to the note each string matching algorithms that, Rabin-Karp string matching algorithm is also very good run, the preprocessing time O (m), in the worst case running time of operation O (n-m +1) the hope of matching time O (n). Basic prin
match, algorithm, prime number, string length, running time, worst case, algorithms, pattern string, rabin, rule reference, model series, karpJuly 3
Trie tree is a search tree, which in essence is a definite finite state machine, each node represents a state, according to the different input variables, for state transition. Trie tree search with a key code key code itself and its time and the len
tree structure, array elements, algorithm, state transition, integers, data structure, tree node, key code, search tree, worst case, extracts, double array, tree search, linear array, finite state machine, checksum value, input variables, linear arrays, tree layers, bifurcationJune 30
In order to re-order, there are a few to give the compiler optimization level to varying degrees of freedom. To a programmer from Taiwan in a given machine running a given program the highest possible performance, note the following points must be ad
code generation, test cases, assumptions, fortran, compiler optimization, c compiler, best performance, optimization level, performance analysis, optimized code, worst case, compiler options, degrees of freedom, level performance, performance program, source module, performance note, variable sets, compiler techniques, tuning guideJune 27
Bash auto-completion feature modern discovery, it does not know how much memory I have done away with the burden of saving the number of keyboard. But to write our own scripts can take advantage of its auto-complete feature? The answer is yes. With a
parameters, source code, scripts, error message, memory, ubuntu, several times, programmers, discovery, shortcuts, cur, keyboard, many things, svn, worst case, gnome, dropbox, sheet pdf, complectionJune 20
"Computer Algorithm Design and Analysis" - Wang Xiaodong - Chapter III - recursive and conquer strategy - Homework 2-11 O (1) space algorithm for sub-array transposition Set a [0: n-1] is an array of n elements, k (0 <= k <= n-1) is a non-
lt, source code, array, chapter 3, chapter iii, transposition, data exchange, algorithm design, stdio, orders of magnitude, negative integers, worst case, analysis time, loop 2, space costs, space algorithm, computer algorithm, wang xiaodong, initial thoughts, room tempMay 21
First look at sort of a basic comparison of eight Sorting The average time Worst case Stability Additional space Notes Bubble O (n 2) O (n 2) Stable O (1) n hours is better Exchange O (n 2) O (n 2) Unstable O (1) n hours is better Select O (n 2) O (n
lt 2, merger, shell, number 0, sorting algorithm, heap, worst case, space notes, nlogn, true numberApril 27
Quick sort (Quicksort) is worth mentioning that several variants of algorithms, where some brief description: Randomized quick row: quick sort of worst-case division based on the principal component for each option. Basic quick sort select the first
no doubt, input data, brief description, probability, variants, general principles, possibilities, quick sort, optimization algorithm, worst case, algorithms, time complexity, random function, principal component, information science, science contest, character requirements, limit case, quicksort, randomizationApril 27
We first summarize the "Sort structural feature 1-4" in the performance of ten methods ((N a keyword to be sorted out)): Sorted The average time Worst time Auxiliary storage space Stability Direct Insertion Sort O (N ^ 2) O (N ^ 2) O (1) √ Binar
bubble sort, insertion sort, storage space, sorting algorithm, quick sort, worst case, time complexity, shell sort, selection sort, sort shell, heap sort, tree selection, logn, internal sorting, n level, sort time, auxiliary storage, worst timeApril 18
Complete and accurate system workload definition or understanding for the prediction of its performance is critical. To measure system performance, the work load may be different than the CPU clock speed or random access memory (RAM) of different siz
system performance, response time, practical application, server requests, uniformity, different systems, time server, random access memory, hardware platforms, worst case, memory ram, performance benchmarks, system throughput, case response, cpu clock speed, exact algorithm, system workload, accurate system, internal applications, performance goalsApril 9
Library functions of the sort: / / Syntax: # Include <algorithm> void sort (iterator start, iterator end); void sort (iterator start, iterator end, StritWeakOrdering cmp); / * 1, sort () algorithm in the interval [start, end) elements in ascending o
two elements, insertion sort, interval, self examination, sort method, ascending order, void sort, sequence length, comparison function, worst case, time complexity, scheduling algorithm, n2, library functions, partition function, stable sort, sort algorithm, sort library, partial sort, split levelApril 8
Tanioku just saw an article, I guess is not related with this? ? -------------------------------------------------- ------------------------------------------------ Today, Apple v. HTC violation of their more than 20 patents, even though Apple did no
google, board of directors, mobile phones, android, resignation, spokesman, nexus, htc, droid, patent infringement, apple board, pain in my heart, touch technology, eric schmidt, worst case, g3, reconciliation, tivo, satellite tv, patentsMarch 29
Binary search method is also known as binary search, which makes full use of the order of relations between elements, with sub-rule strategy can be used in the worst case O (log n) complete the search task. The basic idea] [ N number of elements will
lt, amp, principle, source code, scope, array elements, iteration, search method, implementations, ascending order, worst case, search task, const int, const type, binary search algorithm, termination conditions, c description, odd numbers, computer experts, bentleyMarch 18
Our presentation of dynamic search tree are: a binary search tree (BST), a balanced binary search tree (AVL), red-black tree (RBT), B ~ / B + tree (B-tree). These four trees are several advantages with the following: (1) are dynamic structures. In th
quot, tree structure, general description, root node, worst case, nod, order of magnitude, search process, time complexity, b tree, search length, binary search tree, search structure, dynamic search, search costs, insertion time, four trees, index tree, dynamic structures, theme 1March 12
Transfer: http://bigtall.cnblogs.com/archive/2005/10/20/258362.html Shenzhen's air is getting worse, and it seems to buy an air purifier, and at least ensure that day with 12 hours I can breathe fresh air. If the economy really have to pay this price
shenzhen, fundamental purpose, organization structure, combination of the two, software business, foreign countries, organizational structure, worst case, developed countries, wrong direction, math problem, business problems, famous quote, original media, jeff bezos, amazon founder jeff, two pizza, bigtall, community businesses, air purifierDecember 17
Two sub-search algorithm is to use a classic example of sub-rule strategy. Had already been booked for a given sequence of n elements a [0: n-1], now in the n-element to find a specific element of x. The first is easier to think of the order of searc
lt, implementation, string args, relationship, main string, search algorithm, array, element, elements, search method, search methods, worst case, algorithm demo, search tasks, sequential search, search techniqueSeptember 26
Corncob (corn cobs) is hard at work to get along with people in the development team usually presents the following forms: Not in favor of the team's goals or processes, and constantly trying to change them. Continue to make difficult comment: perfor
coordination, conflict, extent, headache, attitudes, waste of time, independent modules, personality, compromise, own shortcomings, worst case, new job, team goals, slow progress, performance reliability, active management, personal goals, corn cobs, attitude towards work, professional attitudeFebruary 3
port link-type trunk port trunk permit vlan 1xtragrid set bold in rowcellstyleextjs anonymous functioncomponent flash32_14_0_0125.ocxwww77rriicomphp regex backwardHttp: gdcp:tske.eyra100.comhttp: 172.29.10.6 glMotor main.jspremote_dependencies_modehttp: vip.check.papert.com