Questions tagged [low-latency]

For questions pertaining to the measurement or improvement of latency in a system.

In computing terms, describe the time it takes to perform an action. Low latency implies this should be particularly short. It is usually in the range of timings which cannot be seen, only measured.

Low Latency implies that there is a measure for the latency of critical portions of the system and that it should meet this latency requirement a high percentage of the time e.g. 99%, 99.9%, 99.99% or worst case.

This could be any where from 10 nano-second to 100 milli-seconds depending on the context.

Questions which tag low latency should give measurable timings and percentage to reach that as the solution to follow is very dependant on these measures.

Without a latency measure to go by often the simplicity of the solution should be the target which will produce quick application with minimal complexity/effort.

416 questions
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How to compile Mellanox libvma on gentoo?

I am trying to build Mellanox's high speed network library libvma on gentoo http://code.google.com/p/libvma/ However I keep on getting this error In file included from ../../src/vma/util/sys_vars.h:24:0, from ../../src/vma/util/utils.h:22, from…
coolbootgeek
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low latency data link pc to android

can anyone recommend a method for low latency bi-directional com link between my pc app and android slave app. the app i have works now via wifi but the latency is too slow (about 300mS), i'm looking to get it down to 10mS or so. the android is…
steveh
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Fixing method latency in Java

Another problem, same program: The following is MainGUI.java import java.awt.*; import java.awt.event.*; import java.net.*; import java.util.*; import javax.swing.*; import javax.swing.Timer; public class MainGUI extends JFrame implements…
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Is there an AWS service that provides <= 20 milliseconds query latency?

For a use-case, my team is using DynamoDB to query a GSI. With increasing number of rows returned, the query latency increases. Our code looks something like this (Java) (pretty normal) Map keyConditions = new…
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how to slice bytebuffer WITHOUT creating garbage

I am trying to use ByteBuffer as an internal storage for a class. I want to abstract the flip() and ByteBuffer manipulation from the caller but also do not want to use slice() as it creates additional garbage. Is there any alternative or design…
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in a worst case how much QPI latency can slow-down arbitrary application?

I'm developing low-latency HFT trading application. I'm using single-CPU machine. Because it's much easier to configure and maintain, (no need to tune NUMA). Also, obviously, assuming we have enough resources, it should be definitely not slower than…
Oleg Vazhnev
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Extremely fast 8 bytes to double in Java - For HFT application

our HFT trading application is developed in Java. We need to convert 8 bytes to a double number but the conversion has to be extremely fast. Remember our latency is under 15 micro second, so conventional java approaches will probably not work for…
Neha Sharma
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Why would the Nexus 7 and Nexus 10 have different audio latency with the same OS?

I have read that audio latency has been reduced to as low as 12ms on the Android 4.2 Jelly Bean OS. However, I have also read that this improvement is available on the Nexus 10 but not on the Nexus 7. How could these two devices use the same OS and…
user1971506
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What is the absolutely fastest way to output a signal to external hardware in modern PC?

I was wondering, what is the absolutely fastest way (lowest latency) to produce external signal (for example CMOS state change from 0 to 1 on electrical wire connected to other device etc.) from PC, counting from the moment, where CPU assembler…
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What are the real-time compute solutions that can take raw semistructured data as input?

Are there any technologies that can take raw semi-structured, schema-less big data input (say from HDFS or S3), perform near-real-time computation on it, and generate output that can be queried or plugged in to BI tools? If not, is anyone at least…
jbx72487
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Which one performs better in Java? Creating object or getting from cache twice?

The object has 6,7 fields. cache.get() is a map read. Which one is faster? obj temp = cache.get(key); // temporary object creation Int id = temp != null ? temp.getId() : null; or Int id = cache.get(key) != null ?…
sachyy
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