Recent questions tagged performance

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performance - Angular 4 Unit Tests (TestBed) extremely slow

I have some unit tests using Angular TestBed. Even if the tests are very simple, they run extremely slow (on ... , concurrency: Infinity }) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Haskell: Can I perform several folds over the same lazy list without keeping list in memory?

My context is bioinformatics, next-generation sequencing in particular, but the problem is generic; so I will use ... the file each time. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - R: Passing a data frame by reference

R has pass-by-value semantics, which minimizes accidental side effects (a good thing). However, when code ... are exclusively with data frames. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Packing two DWORDs into a QWORD to save store bandwidth

Imagine a load-store loop like the following which loads DWORDs from non-contiguous locations and stores them ... useful extensions like BMI. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Iterate a windows ascii text file, find all instances of {LINE2 1-9999} replace with {LINE2 "line number the code is on"}. Overwrite. Faster?

This code works. I just want to see how much faster someone can make it work. Backup your Windows 10 batch file ... of anything to speed it up? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Why does my App start incredibly slow (10s+) at first run, showing only white screen on android 5.0?

I have a freshly created app (built in android studio 2.0), having a few activities. When I test it on my Android ... play-services-gcm:8.3.0" } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Programmatically getting per-process network statistics on Windows?

I'd like to find out which processes are using my network. This is quite easy in Linux, but I'm stumped as to ... 7 preferred. Win32 or COM OK. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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734 views

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performance - Cost of Inserts vs Update in SQL Server

I have a table with more than a millon rows. This table is used to index tiff images. Each image has ... have other indices on the fields. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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764 views

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performance - How expensive is []byte(string)?

Let's convert string to []byte: func toBytes(s string) []byte { return []byte(s) // What happens here? ... /decoding, like utf8 <-> runes? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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803 views

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performance - How to reduce Scala (/ Java) startup overhead?

I'm pretty ignorant of the Java world (I do mostly C / Python) but Scala looked interesting enough to pull me ... ) imports for a Scala program? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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683 views

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performance - Why is this naive matrix multiplication faster than base R's?

In R, matrix multiplication is very optimized, i.e. is really just a call to BLAS/LAPACK. However, I'm ... you're okay skipping the checking. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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805 views

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performance - _.isFunction(a) vs. typeof a === 'function'? javascript

I think it might be only performance case - http://jsperf.com/comparing-underscore-js-isfunction-with-typeof- ... more appropriate to use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

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performance - Reserve memory for list in Python?

When programming in Python, is it possible to reserve memory for a list that will be populated with a known ... etc. stored directly in lists? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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758 views

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performance - How to measure the speed of a python function

I usually write codes(functions) on www.codefights.com as a competitor.So speed is one of the important part of ... function or a def function . See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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performance - Java Double vs double: class type vs primitive type

I was curious to what the performance differences between Java's class and primitive type for double were. ... to allow mathematical operators? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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747 views

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performance - Why is printf in F# so slow?

I've just been really surprised by how slow printf from F# is. I have a number of C# programs that process ... 30,000 rows. Nothing special. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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781 views

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performance - Array vs Slice: accessing speed

This question is about the speed of accessing elements of arrays and slices, not about the efficiency of passing them ... (tried byte and int) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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performance - Why do MySQL InnoDB inserts / updates on large tables get very slow when there are a few indexes?

We have a series of tables that have grown organically to several million rows, in production doing an insert ... locking a table for updates? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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618 views

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performance - Is CSS faster when you are specific?

Is div.container faster than .container ? You know like in jquery if you be more specific with your selectors it ... if it is better specified? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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782 views

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performance - Most efficient way to find smallest of 3 numbers Java?

I have an algorithm written in Java that I would like to make more efficient. A part that I think ... speed increase would be greatly helpful See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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687 views

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performance - BDE vs ADO in Delphi

Please note the Edit below for a lot more information, and a possible solution We recently modified a large Delphi ... := FSQL.Text; end; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

1 answer

performance - reuse JVM in Hadoop mapreduce jobs

I know we can set the property "mapred.job.reuse.jvm.num.tasks" to re-use JVM. My questions are: (1) ... mapreduce jobs? Thank you very much! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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671 views

1 answer

performance - Android - Declarative vs Programmatic UI

Has anyone seen or compiled benchmarks comparing declarative (XML) versus programmatically created UI's in Android? ... for any reason? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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754 views

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performance - Whats the main advantage and disadvantage of "do not keep activities" in android

One query I would like to have if anyone could answer it like: Do not keep activities options to be checked ... share the experience on 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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643 views

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performance - Find an element in an infinite length sorted array

Given an infinite length sorted array having both positive and negative integers. Find an element in it. EDIT All ... best case and worst case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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performance - gdi+ Graphics::DrawImage really slow~~

I am using a GDI+ Graphic to draw a 4000*3000 image to screen, but it is really slow. It takes about ... ? It's really annoying -___________-| See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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817 views

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performance - Fastest Way to generate 1,000,000+ random numbers in python

I am currently writing an app in python that needs to generate large amount of random numbers, FAST. Currently I ... make this faster? Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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596 views

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performance - Big O, what is the complexity of summing a series of n numbers?

I always thought the complexity of: 1 + 2 + 3 + ... + n is O(n), and summing two n by n matrices would be ... O(n^2). What am I missing here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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