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performance - Python fastest access to line in file
    I have an ASCII table in a file from which I want to read a particular set of lines (e.g. lines 4003 to 4005 ... - but I'd much rather avoid it. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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786 views
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performance - How efficient/fast is Python's 'in'? (Time Complexity wise)
    In Python, what is the efficiency of the in keyword, such as in: a = [1, 2, 3] if 4 in a: ... See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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572 views
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performance - How to understand an EXPLAIN ANALYZE
    I am not very familiar with looking at EXPLAIN ANALYZE results, I have a huge problem with my queries being too ... ) Total runtime: 56.851 ms See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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737 views
1 answer
performance - Optimize mySql for faster alter table add column
    I have a table that has 170,002,225 rows with about 35 columns and two indexes. I want to add a column. The ... add column in tuning of the db? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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571 views
1 answer
performance - Why is the new Tuple type in .Net 4.0 a reference type (class) and not a value type (struct)
    Does anyone know the answer and/or have an opinion about this? Since tuples would normally not be very large, I ... for these. What say you? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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705 views
1 answer
performance - How do I insert a linebreak where the cursor is without entering into insert mode in Vim?
    Is possible to insert a line break where the cursor is in Vim without entering into insert mode? Here's an example ( ... a better way to do it? See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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641 views
1 answer
performance - Can not increase max_open_files for Mysql max-connections in Ubuntu 15
    I am running this version of Mysql Ver 14.14 Distrib 5.6.24, for debian-linux-gnu (x86_64) On this version ... point. Thanks a lot in advance. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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493 views
1 answer
performance - Why does Java's ArrayList's remove function seem to cost so little?
    I have a function which manipulates a very large list, exceeding about 250,000 items. For the majority of ... several hundred thousand items. See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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717 views
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performance - improving speed of Python module import
    The question of how to speed up importing of Python modules has been asked previously (Speeding up the python ... Mac and Linux machines. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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797 views
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performance - PostgreSQL UNIX domain sockets vs TCP sockets
    I wonder if the UNIX domain socket connections with postgresql are faster then tcp connections from localhost in high ... does, by how much? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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571 views
1 answer
performance - What is the fastest (to access) struct-like object in Python?
    I'm optimizing some code whose main bottleneck is running through and accessing a very large list of struct-like ... that I've missed? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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612 views
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performance - Hash table - why is it faster than arrays?
    In cases where I have a key for each element and I don't know the index of the element into an array, ... the memory disposition, isn't it? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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523 views
1 answer
performance - Find the least number of coins required that can make any change from 1 to 99 cents
    Recently I challenged my co-worker to write an algorithm to solve this problem: Find the least number of ... algorithm that's more efficient. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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634 views
1 answer
performance - Java 2D game graphics
    Next semester we have a module in making Java applications in a team. The requirement of the module is to ... performance 2D graphics in Java? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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535 views
1 answer
performance - How do I find out what is hammering my SQL Server?
    My SQL Server CPU has been at around 90% for the most part of today. I am not in a position to be able ... what is causing CPU grief within SQL. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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521 views
1 answer
performance - Can a React-Redux app really scale as well as, say Backbone? Even with reselect. On mobile
    In Redux, every change to the store triggers a notify on all connected components. This makes things very simple for ... flawed for a large app? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
734 views
1 answer
performance - When to use CouchDB over MongoDB and vice versa
    I am stuck between these two NoSQL databases. In my project I will be creating a database within a database. ... need efficient paging as well. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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636 views
1 answer
performance - Any way to move 2 bytes in 32-bit x86 using MOV without causing a mode switch or cpu stall?
    If I want to move 2 unsigned bytes from memory into a 32-bit register, can I do that with a MOV ... this causes a big performance hit. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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626 views
1 answer
performance - How to measure?
    when I did performance-tuning, I will first to work in the high-level and try to answer is this cpu-bound ... knows how to measure these items? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
778 views
1 answer
performance - Mysql: Perform of NOT EXISTS. Is it possible to improve perfomance?
    I have two tables posts and comments. Table comments have post_id attribute. I need to get all posts with ... construction in this situation. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
645 views
1 answer
performance - Storing Python objects in a Python list vs. a fixed-length Numpy array
    In doing some bioinformatics work, I've been pondering the ramifications of storing object instances in a Numpy array ... that has any impact. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
604 views
1 answer
performance - Efficiency: recursion vs loop
    This is just curiosity on my part, but what is more efficient, recursion or a loop? Given two functions (using ... ))) Which is more efficient? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
707 views
1 answer
performance - Java Runtime.maxMemory incorrect?
    I ran the following method Runtime.getRuntime().maxMemory() and gave 85196800. However, I then ran top from the ... ideas what is going on? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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592 views
1 answer
performance - Haswell AVX/FMA latencies tested 1 cycle slower than Intel's guide says
    In Intel Intrinsics Guide, vmulpd and vfmadd213pd has latency of 5, vaddpd has latency of 3. I write some ... vzeroupper Hard question to me. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
526 views
1 answer
performance - How does the IN predicate work in SQL?
    After prepairing an answer for this question I found I couldn't verify my answer. In my first programming ... the IN predicate actually work? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
723 views
1 answer
performance - Setting a fixed FPS in Pygame, Python 3
    I'm currently making a game using PyGame (Python 3), and I'm looking for a way to make the game run ... if that wording was rather confusing. See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
634 views
1 answer
performance - Why are CSS animations and transitions blocked by JavaScript?
    Update 2: Running the JSFiddle below, in Chrome 31.0.1650.34 beta now does not result in the described behaviour i ... .active { opacity: 1; } See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
0 votes
479 views
1 answer
performance - Can I enforce the order of XML attributes using a schema?
    Our C++ application reads configuration data from XML files that look something like this: <data> <value ... huge runtime performance penalty? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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