cpu

Virtuoso System Requirements

由 一笑奈何 提交于 2021-02-07 03:47:51
问题 We would be using Virtuoso for storing RDFs, the triple count will be 100 million to start with. I need to know what should be typical RAM, CPU, Disk etc for this. Querying will be with SPARQL and there will be a bit complex queries. Kindly provide your inputs. 回答1: The average size of a Virtuoso version 6.x triple (quad) is about 30bytes thus for 100 million triples you would need about 3GB RAM , this being the most critical component to enable the database working set to fit in memory ,

how to set CPU affinity of a program?

由 限于喜欢 提交于 2021-02-06 10:47:30
问题 I have a program written in C#, I am using VSTS 2008 + .Net 3.5 + Windows Vista Enterprise x86 to develop a Windows Forms application. My current computer is dual-core CPU, I want to set CPU affinity of my program to run on a specific CPU and free another CPU to do some other job. Any ideas how to do this? Either through coding or configuration is ok. A little more background is, my program is CPU intensive, so I do not want to let it occupy all two CPU resources on my computer and I want to

how to set CPU affinity of a program?

由 ∥☆過路亽．° 提交于 2021-02-06 10:45:07
问题 I have a program written in C#, I am using VSTS 2008 + .Net 3.5 + Windows Vista Enterprise x86 to develop a Windows Forms application. My current computer is dual-core CPU, I want to set CPU affinity of my program to run on a specific CPU and free another CPU to do some other job. Any ideas how to do this? Either through coding or configuration is ok. A little more background is, my program is CPU intensive, so I do not want to let it occupy all two CPU resources on my computer and I want to

How is PCI segment(domain) related to multiple Host Bridges(or Root Bridges)? [closed]

由 ∥☆過路亽．° 提交于 2021-02-05 20:35:53
问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 months ago . Improve this question I'm trying to understand how PCI segment(domain) is related to multiple Host Bridges? Some people say multiple PCI domains corresponds to multiple Host Bridges, but some say it means multiple Root Bridges under a single Host Bridge. I'm confused and I don't find

How is PCI segment(domain) related to multiple Host Bridges(or Root Bridges)? [closed]

由 老子叫甜甜 提交于 2021-02-05 20:35:21
问题 Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 months ago . Improve this question I'm trying to understand how PCI segment(domain) is related to multiple Host Bridges? Some people say multiple PCI domains corresponds to multiple Host Bridges, but some say it means multiple Root Bridges under a single Host Bridge. I'm confused and I don't find

How does CPU perform operation that manipulate data that's less than a word size

由 ≯℡__Kan透↙ 提交于 2021-02-05 11:39:49
问题 I had read that when CPU read from memory, it will read word size of memory at once (like 4 bytes or 8 bytes). How can CPU achieve something like: mov BYTE PTR [rbp-20], al where it copies only one byte of data from al to the stack. (given the data bus width is like 64 bit wide) Will be great if anyone can provide information on how it's implemented on the hardware level. And also, as we all know that when CPU execute program, it has program counter or instruction pointer that points to the

What happens in the CPU when there is no user code to run?

由 戏子无情 提交于 2021-02-05 05:50:09
问题 It sounds reasonable that the os/rtos would schedule an "Idle task". In that case, wouldn't it be power consuming? (it sounds reasonable that the idle task will execute: while (true) {} ) 回答1: This depends on the OS and the CPU architecture. On x86 (Intel compatible) the operating system might execute HLT instructions, making the CPU wait until something interesting happens, such as a hardware interrupt. This supposedly consumes very little power. Operating systems report the time spent doing

why parallel execution on java compile take linear growth in time

由 旧时模样 提交于 2021-02-04 12:51:05
问题 time javac Main.java --> 0m1.050s time javac Main.java & javac Main.java --> 0m1.808s time javac Main.java & javac Main.java & javac Main.java --> 0m2.690s time javac Main.java & ... 8 time --> 0m8.309s When we run javac command in parallel and with each increase in javac command ~1 sec gets added for all the javac command to complete. Why is there a linear growth is time ? Is all javac process while running involved in some kind on locks , if yes how to overcome it so as not to have a linear

CPU

由 放肆的年华 提交于 2021-02-02 06:42:09
time Profile 时间分析工具用来检测应用CPU使用情况 可以看到应用程序选中各个方法正在消耗CPU时间 使用大量CPU不一定是个问题 客户端中动画就对CPU依赖就非常高 动画本身也是非常苛刻且消耗资源较多的任务 Time Profiler帮助我们分析代码的执行时间，找出导致程序变慢的原因，告诉我们“时间都去哪儿了？”。 Time Profiler分析原理：它按照固定的时间间隔来跟踪每一个线程的堆栈信息，通过统计比较时间间隔之间的堆栈状态，来推算某个方法执行了多久，并获得一个近似值。其实从根本上来说与我们的原始分析方法异曲同工，只不过其将各个方法消耗的时间统计起来。 原始的性能分析方法 这种分析方法估计是很多开发人员第一时间想到的，写个单元测试，在开始和结束的地方记录时间。 示例代码： 1 2 3 4 5 6 NSDate *startDate = [NSDate date]; for(int i = 0; i < 999; i++){ // do something } NSDate *endDate = [NSDate date]; NSLog(@"time:%f", [endDate timeIntervalSinceDate: startDate]); 这种方法的缺点有以下几点: 1、测试效率太低，很多性能瓶颈是很难预估到的，需要从上层到下层进行逐步排除； 2

HOW TO FORCEFULLY DISABLE intel_pstate? intel_pstate is enabled on reboot even with intel_pstate=disable option in grub

由 走远了吗. 提交于 2021-01-29 10:20:55
问题 I am trying to use cpu-frequency scaling to set cpu frequency. In my system, only powersave , performance frequency-scaling-governor supported. It was explained in other document, by default, intel_pstate is enabled and it only supports powersave , performance frequency-scaling-governor and solution is disable intel_pstate. So I tried to disable as below sudo nano /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable" sudo update-grub on reboot, intel_pstate is enabled. so ,
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