multicore

What is responsible for changing core's load and frequency in multicore processor

由 人盡茶涼 提交于 2019-12-08 15:41:33
问题 Having looked for a description of the multicore design i keep finding several diagrams, but all of them look somewhat like this: I know from looking at i7z command output that different cores can run at different frequencies. This would suggest that the decisions regarding which core will be given a new process and for changing the frequency of the core itself are done either by the operating system or by the control block of the core itself. My question is: What controls the frequencies of

How can I determine programmatically whether on multi-core, hyperthreading or multi-processor?

由 瘦欲@ 提交于 2019-12-08 10:40:08
问题 I know how to get the processor type, perhaps that's the only way, but I'm actually looking for a way to determine from an application whether it's running on a multi-core processor or on a hyper-threading single-core processor . (background: the hosting providers of some of my clients are very vague about what resources they make available through VMWare images. This application is supposed to run on multi-core, but has seen detrimental performance since its last "move". Normally, on multi

How to Search Multiple SOLR Core?

由 二次信任 提交于 2019-12-07 19:59:28
问题 In Single Solr Instance, multiple core(s) are there. No Shards, Replication and Cloud concept involved. Now how to search over multiple core in this scenario? 回答1: To search across cores, you'll have to use sharding. If the schema for both cores are identical, you can just query one core and provide the shards parameter. If the schema is different, create a separate core that have a merged schema of both the target schemas, then query that core with the two separate cores as shards. Having

Multiple threads on a multicore processor

由 巧了我就是萌 提交于 2019-12-07 18:59:38
问题 How are threads distributed between CORES in a multithreaded system. Lets say i have a program that creates 6 threads. My system has 3 CORES. In this case will the threads be distributed between the 3 COREs or will all the threads execute on the same CORE? 回答1: I found a decent explanation on this blog post. You can use some pinvoke calls to set the thread affinity: [DllImport("kernel32.dll")] static extern IntPtr GetCurrentThread(); [DllImport("kernel32.dll")] static extern IntPtr

QueryPerformanceCounter on multi-core processor under Windows 10 behaves erratically

由 久未见 提交于 2019-12-07 16:55:51
问题 Under Windows, my application makes use of QueryPerformanceCounter (and QueryPerformanceFrequency ) to perform "high resolution" timestamping. Since Windows 10 (and only tested on Intel i7 processors so far), we observe erratic behaviours in the values returned by QueryPerformanceCounter . Sometimes, the value returned by the call will jump far ahead and then back to its previous value. It feels as if the thread has moved from one core to another and was returned a different counter value for

Solrcloud multicore configuration

由 爱⌒轻易说出口 提交于 2019-12-07 13:33:43
问题 I have a standalone Solr instance with 4 different cores working fine using the embedded Jetty server. I configured the cores for v4.10.3 but since I moved to v5.1 and all seems to work fine without any changes. Before going into production, I need to set it up as a Solrcloud installation, initially with 2 nodes (two different machines) with 1 shard per node (to keep it simple). I have been trying to get it to work but I have not been able to do it. I tried to run it like this (I think using

Where to find Paint.NET multithreading white paper?

由 爱⌒轻易说出口 提交于 2019-12-07 12:33:48
问题 Like I wrote elsewhere, I seem to be sure that a white paper by Rick Brewster about multithreading used in Paint.NET once existed. I am not able to find any reference to this white paper again however. Does it (still) exist? And if so, where? EDIT: Found out in comments to an unrelated question that Paint.NET is still free, but code is no longer available? Is this related to the fact that I can't seem to find that white paper any more? EDIT2: Went straight to the horses mouth on this and will

Using Multicore in R for a pentium 4 HT machine

由 荒凉一梦 提交于 2019-12-07 08:25:14
问题 I am using a Pentium 4 HT machine at office for running R, some of the code requires plyr package, which I usually need to wait for 6-7 minutes for the script to finish running, while I saw my processor is only half utilized. I have heard of using Multicore package in R for better utilizing the multicore processor, is my case suitable for this? Thanks! 回答1: There is a bunch of packages out there to do multicoring. See doMPI , doSNOW , doMC and doSMP . They are all front ends for other

How can I Monitor cpu usage per thread of a java application in a linux multiprocessor environment?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-06 15:42:17
I'm running a multithreaded java app in Linux RedHat 5.3 on a machine that has 8 cores (2 quad-core cpu's). I want to monitor the cpu usage of each thread, preferably relative to the maximal cpu it can get (a single thread running on 1 of the cores should go up to 100% and not 12.5%). Can I do it with jconsole/visualVM? Is there another (hopefully free) tool? Yoav If you don't want to use OS specific functions like traversing the /proc directory, you can usually get the values you're looking for from the Java management interface with ThreadMXBean.getThreadCpuTime() and ThreadMXBean

Parallel / Multicore Processing in R for an Integer Program?

由 こ雲淡風輕ζ 提交于 2019-12-06 14:56:07
问题 Are there any packages specifically to let R run faster via parallel computing? I have made a very large IP that needs to run for a while, so I was wondering if there was a specific package in R that could help me run my IP. Currently, I have a function that returns the solution of an IP and the primary line that R gets stuck on (for a very...very long time) is when I use lp (....all.int = TRUE). My CPU is around 12.5% (8 cores) on my Windows computer, and I want it to near 100 Edit: I tried
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