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
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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
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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
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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,
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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).
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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
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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
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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
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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
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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
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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
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"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-
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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