Recent questions tagged Performance

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performance - Lookup table vs switch in C embedded software

In another thread, I was told that a switch may be better than a lookup table in terms of speed and compactness. ... why! Thanks for your help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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585 views

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performance - What's the fastest way to concatenate two Strings in Java?

What's the fastest way to concatenate two Strings in Java? i.e String ccyPair = ccy1 + ccy2; I'm ... .lang.StringBuilder.(StringBuilder.java:93) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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752 views

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performance - Which is faster? Comparison or assignment?

I'm doing a bit of coding, where I have to write this sort of code: if( array[i]==false ) array[i]=true; ... I don't think that applies here :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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692 views

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performance - PostgreSQL slow on a large table with arrays and lots of updates

I have a pretty large table (20M records) which has a 3 column index and an array column. The array ... have much experience with those). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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601 views

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performance - Android compilation is slow (using Eclipse)

When I change any .java file and build, the compilation takes 16 seconds. I don't understand why it ... to improve the compilation speed? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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486 views

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performance - Why is zipped faster than zip in Scala?

I have written some Scala code to perform an element-wise operation on a collection. Here I defined two methods ... on a collection in Scala? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Network throttling with chrome and selenium

Google Chrome 38 introduced the new "Device Mode & Mobile Emulation" functionality in devtools. In addition ... about chrome+selenium. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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856 views

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performance - preallocate list in R

It is inefficient in R to expand a data structure in a loop. How do I preallocate a list of a certain size? ... is a better way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Android Recyclerview vs ListView with Viewholder

I recently came across the android RecyclerView which was released with Android 5.0 and it seems that ... is different from Listview? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Python string formatting: is '%' more efficient than 'format' function?

I wanted to compare different to build a string in Python from different variables: using + to concatenate (referred ... (name, mean(timings)) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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525 views

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performance - Measuring Java execution time, memory usage and CPU load for a code segment

For a particular segment of Java code, I'd like to measure: Execution time (most likely thread execution time) ... would go down really 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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755 views

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performance - android ble connect slowly

Hi I'm writing an Android app to connect to a BLE peripheral device. Android 4.4.2, Galaxy Nexus. I have ... any chance we can improve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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performance - Android: requestLayout() improperly called

The following error occurs when I attempt to inflate a layout within a ListView: requestLayout() improperly ... a ViewPager and Fragments See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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515 views

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performance - SQL Server SELECT statements causing blocking

We're using a SQL Server 2005 database (no row versioning) with a huge select statement, and we're seeing it ... I can do to mitigate this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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477 views

1 answer

performance - Angular 7 ,Reactive Form slow response when has large data

I have a very complex and large data and I have to build a Reactive form around it in a component. ... performance issues in the Reactive Form. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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561 views

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performance - Is branch divergence really so bad?

I've seen many questions scattered across the Internet about branch divergence, and how to avoid it. However, ... divergent code is faster. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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570 views

1 answer

performance - Efficiency of branching in shaders

I understand that this question may seem somewhat ungrounded, but if someone knows anything theoretical / has ... the real situation... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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749 views

1 answer

performance - OpenGL - How to calculate normals in a terrain height grid?

My approach is to calculate two tangent vectors parallel to axis X and Y respectively. Then calculate the cross ... in terms of CPU cycles. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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684 views

1 answer

performance - Max files per directory in S3

If I had a million images, would it be better to store them in some folder/sub-folder hierarchy or ... their ACLs (programatically speaking)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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627 views

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performance - Why is long slower than int in x64 Java?

I'm running Windows 8.1 x64 with Java 7 update 45 x64 (no 32 bit Java installed) on a Surface Pro 2 ... Java 8 RTM, no significant change. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

477 views

1 answer

performance - Get number of concurrent requests by browser

I'm trying to figure out whether it would be worthwhile to spread image requests across multiple sub-domains ... , per this question? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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720 views

1 answer

performance - High Memory Usage Using Python Multiprocessing

I have seen a couple of posts on memory usage using Python Multiprocessing module. However the questions don't seem ... can I fix this issue? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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700 views

1 answer

performance - Speed tradeoff of Java's -Xms and -Xmx options

Given these two commands A: $ java -Xms10G -Xmx10G myjavacode input.txt B: $ java -Xms5G -Xmx5G myjavacode input ... the output of my program? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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480 views

1 answer

performance - How to do OpenGL live text-rendering for a GUI?

I'm implementing a GUI built on top of OpenGL. I came to the problem that each GUI will have -- text ... GForce 6 and later graphics cards. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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552 views

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performance - GHC's RTS options for garbage collection

I have a Haskell program which processes a text file and builds a Map (with several million elements). The ... (B.unpack newSuffix) newStates) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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496 views

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performance - Client-side logic OR Server-side logic?

I've done some web-based projects, and most of the difficulties I've met with (questions, confusions) could be ... mobile devices, and others). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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537 views

1 answer

performance - What does the times mean in Google Chrome's timeline in the network panel?

Often when troubleshooting performance using the Google Chrome's network panel I see different times and often wonder ... long waiting times? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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510 views

1 answer

performance - Optimizing member variable order in C++

I was reading a blog post by a game coder for Introversion and he is busily trying to squeeze every CPU tick ... coding this way by default. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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