This code recipe describes how to get, build, and use the Quantum ESPRESSO code that includes support for the Intel® Xeon Phi™ coprocessor with Intel® Many-Integrated Core (MIC) architecture. This recipe focuses on how to run this code using explicit offload.
本代码介绍了如何获取、构建和使用 Quantum ESPRESSO 代码，该代码支持英特尔® 至强融核™ 协处理器以及英特尔® 集成众核 (MIC) 架构。 本文将重点介绍如何通过显式卸载运行该代码。
Quantum ESPRESSO 是一套集成的开源计算机代码，应用于电子结构计算和纳米级材料建模。 该代码以密度泛函理论、平面波和赝势为基础。 Quantum ESPRESSO 代码由 Quantum ESPRESSO Foundation 进行维护，并通过 GPLv2 许可协议提供。 该代码支持英特尔® 至强™ 处理器（本文中称“主机”）与英特尔® 至强融核™ 协处理器（本文中称“协处理器”）在单个节点和单个集群环境中以卸载模式操作。
- 下载最新 Quantum ESPRESSO 版本：http://www.quantum-espresso.org/download/
从下列 Gibthub 克隆线性代数程序包 libxphi：
Does MIC only support 3 analysis types of vtune:General-exploration, advanced-hotspots, bandwith?
However I use snb-access-contention ,and also got a result.The result is believable?
I recently started using Xeon Phi cards for parallel programming, so I am still a newbie in this field.
I wrote this code as a simple example to start understanding this fascinating world, but I got surprised when I looked at the time of executions.
When I run the code on the host, execution time is 0,08 s. When I run the code adding the pragma offload and pragma omp parallel for, execution time increase up to 9s!
When I compiled the codes, I used -O3 optimization for both of them.
Is there something I am missing?
how to monitor mic's Cache Utilization when a program is running? use vtune or some other tools?
We have a number of iDataPlex dx360 M4 Server machines with each 2 Xeon Phi Coprocessor 5110P cards, and one Mellanox ConnectX-3 card. We're running SLES 11sp3 linux on these machines using a 3.0.101-0.40-default kernel. I've installed mpss 3.4.3, updated the firmware and almost everything seems to function.
The only problem I encounter is with infiniband.
I am porting a code to Xeon Phi (using manual offload) in C++ and I am trying to catch SIGINT signal to free correctly memory before stopping the program. This program also uses openMP tasks for asynchronous I/O.
My first goal is to ignore the SIGINT signal with the function sigaction and the macro SIG_IGN. Unfortunately, my program can still be stopped by a Ctrl C. I also tried to block the SIGINT signal (with pthread_sigmask) before the omp parallel region and catch this signal in the master thread only but without success.
While porting an image processing library to the Xeon Phi, I stumbled upon a strange behaviour: the processing is about 20% faster when I set the number of threads to precisely 103 (I ran the processing multiple times using between 95 and 118 threads).
I am running Ubuntu 14.04 with a xeon phi 31s1p and I have been trying to set up a bridge so that I can have the phi access the internet, although I have been having a lot of trouble and can't seem to figure out what's wrong. I'm pretty sure the bridge itself is fine but the phi can't connect to it, anytime I try and use the simple command for it to connect to the bridge it gives this:
/var/mpss/mic0/etc/network# micctrl --network=static --bridge=br0 --ip=172.31.1.1
[Error] br0: Failed - required brctl command not installed