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unexpected hStreams performance
Hey guys, I am writing microbenchmarks with hStreams, but I met with some unexpected performance numbers. The observations are that, when increasing the number of partitions (or places per domain), the...
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Unexpected Performance for Separate Process of offload
Hi everyone, When I tried to separate the offload process for axpy(y[i] = x[i] * a + y[i]) (allocate/copy memory for x/y to coprocessor(xeon phi)-> run the kernel on the coprocessor(xeon phi)->...
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Why Are Two Same Code and Data with Different Execution Time?
Hi everyone,I found that when I run the axpy(y[i] = x[i] * a + y[i]) with two separate set of similar data, I got the totally different execution time as following. The attached file is the sample code...
View ArticleOpenMP 4.0 Copying partial arrays to the device - weird behavior
Hello all. I am trying to reduce my offload costs by only copying the data that I need.!original copy !$omp target update from(my_array) !this works !$omp target update from(1:1000,1) !$omp target...
View Articleproject rebuild error - #11012
Hi,I am just starting to learn how to program Intel PHI card. I have recently written the 1st and a very simple program (to copy some array from host to card memory) but unable to rebuild...
View Article[Fortran] Regarding Implementation of fast-transcendentals on Xeon / Xeon Phi
Hello,I have been experimenting with the following compiler flags / options.1. fp-model [strict, source, fast=2,etc]2. -fast-transcendentals3.-fimf-precision=high/low/mediumI have been comparing the...
View ArticleNative mpi
I would like to clear confusion regarding native mpi paradigm in intel xeon phi. Is it possible to use mpi to create two tasks in two separate node xeon phi natively ? That means, i want to use two...
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Compiling for the Intel® Xeon Phi™ processor x200 and the Intel® AVX-512 ISA
IntroductionThis document briefly gives an overview of the Intel® Advanced Vector Extensions 512 (Intel® AVX-512) and shows different ways to build an application for the Intel® Xeon Phi™ processor...
View ArticleHow to install 'locale' on Xeon Phi?
Hi. I want to install the 'locale' package on Xeon Phi. How to do this? It's not like a library, which I can cross-compile and upload it to the board. 'locale' is related to environmental variables and...
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Less performance on mic
HPL benchmark performance obtained on a host + 1 MIC cards is coming only 154GFlops. The Host system has 102 GB memory. The theoretical peak is 1.2TF + + 256GFLOPS = 1.4TF. May I please know how to...
View ArticleSemana sobre Programação Massivamente Paralela
Lingua Portoghese, BrasileO objetivo principal desta palestra é introduzir o conceito de “modernização de código” aos pesquisadores e desenvolvedores de software que não tem como foco principal a...
View Articlehow can I offload more than one part of a whole array ?
If I have a global array A, which contains all my data. I may use different parts of A in an offload sections. How do I just copy content of parts (more than one) I am interested in to mic but not copy...
View Articlequestion on cache eviction
I'm experimenting on cache eviction in my code using _mm_clevict(), and have the following observations:(1) if data are evicted from L1 alone (_MM_HINT_T0), the code is slowed by ~30%.(2) if data are...
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MPSS Unable to start
Hello, my Xeon Phi was working for about a month and suddenly it has stopped working. Using the Intel MPSS Debugging Flowchart for Linux I followed the steps down and then across the bottom to...
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Symmetric mode does not run and hangs mic
I have set up a system with Intel Xeon processors and Xeon Phi coprocessors under CentOS 7, kernel 3.10.0-327, Intel Composer Xe 2015.2.164. Installation os MPSS 3.6.1 went smoothly. Build up of MIC...
View ArticleData structure in Xeon phi
Dear all: In my simulation, i have multiple simulation boxes. Molecules can randomly interchange between boxes based on potential energy calculation, so i need to append new molecule and...
View ArticleUnable to run HPL on mic
I am running hpl on mic node , but facing the error and run is stopped .Error in scif_send 0: Success.
View ArticleLinux does not detect Xeon Phi card
Here is our setup:Motherboard: Asus P9X79 WS BIOS version 4802 (Above 4G decoding is enabled) CPU: Intel Core i7 4820K OS: CentOS 7.1 with Linux 3.10.0-229I have a Xeon Phi 31S1P. I have not been able...
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An Intro to MCDRAM (High Bandwidth Memory) on Knights Landing
The Intel’s next generation Xeon Phi™ processor family x200 product (code-name Knights Landing) brings in new memory technology, a high bandwidth on package memory called Multi-Channel DRAM (MCDRAM) in...
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