Asyncronous offload takes more time than expected
Hi all,Here is a tricky issue i seem to be facing.The use of the signal for asynchronous offload is defined in intel website as "both asynchronous data copy and compute".That means the directive below...
View ArticleDebugging an offload application
Hello, I am trying to offload a function but I get the following error: offload error: process on the device 0 was terminated by signal 11 (SIGSEGV)Searching on the forum I found that there is no...
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Intel® Xeon Phi™ Coprocessor Performance Proof Points
This presentation is an expanding collection of Intel® Xeon Phi™ coprocessor test cases or “proof points” that demonstrate improved software performance for key applications and benchmarks in key...
View ArticleAsynchronous data send taking time
Hi all, I want to send data into the MIC asynchronously.I used the code below. start_time = omp_get_wtime() !dir$ offload_transfer target(mic:0)in(TRACER)signal(1) end_time =...
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Runtime of OpenCL command queue creation
Hello,while using the Intel Xeon Phi with OpenCL (currently version 1.2) I stumbled upon some runtime issues on my Linux system. Further measurements showed the creation of the command queue takes...
View ArticleOptimizations for Computing Factorization [cado-nfs]
Hello,I would like to determine the requirements for factorization of RSA120 using k1om...
View ArticleMatrix multiplication in Matlab runs slower on the Xeon Phi
I have a system with the following configuration:- Xeon Phi 31s1p (57 cores, 8Gb RAM) with MPSS 3.6 installed;- Intel I7 3820 @3.6GHz;- Asus P9X79WS (BIOS version 4802 - the most recent);- 8Gb RAM;-...
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SCIF DMA to FPGA
We have successfully integrated a MIC into a system that we are developing. We are using SCIF to transfer data from the host to the MIC and from the MIC to the host. However we have a requirement to...
View Articlebuilding mpss 3.5 source
Is there any documentation available for building mpss 3.5 from source ? Thank you,-John
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Optimizing matrix-vector multiplication
Hello everyone,In the application I am developing a large matrix M exists of size nxm (n >> m) and a vector x of appropriate size (I will explain what I mean by appropriate). I have to perform...
View Articlelibiomp5.so (with ompt support) cannot trigger ompt_intialize() in an offload...
I'm running an Intel MIC offload openmp application using openmp runtime (with ompt support, both the CPU side and the MIC side), while libiomp5.so on the CPU side can trigger its ompt_intialize() and...
View ArticleOffloading argv vector
Hello,I am trying to offload the argv vector on MIC and I was wondering what would be the right path to follow.I found out here :...
View Article[SCIF user guide] Alignment and DMA transfers question
Hi,in the subsection 4.1 in the SCIF user guide it is written the following.“Lower performance will likely be realized if the source and destination base addresses are not cacheline aligned but...
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Using OpenCV with ICC and MIC
HelloI am working on my master thesis that involves using Intel Xeon Phi for image processing. I intend to use OpenCV libraries for the image processing, matrix multiplication and similar needs.Firstly...
View ArticleClarification on the Capabilities of Xeon Phi
I have purchased 3x Xeon Phi 3120P. Now I realize they are totally useless without the compiler, which is another hidden cost of 700 USD. Then, what I am wondering is whether I will have the same...
View ArticleIntel MIC - sum of intrinsic vector elements
I have a __m512d intrinsic vector and I need sum of his elements. Is there any easy way to do this? I am concentrated on a performance of computation, so i need to do this operation quickly. My...
View ArticleCompiling LTTng for the Xeon Phi
Hi,I am currently in trying to compile LTTng for the Xeon Phi for the first time, I started by trying to compile Userspace-RCU which should support the Xeon Phi, as x86_64-linux-k1om is recognized. I...
View Articleofed-driver compilation error, centos 6.7
I am using Centos 6.7, kernel 2.6.32-573.3.1.el6.x86_64, OFED 3.18-1. From the release information I see that mpss 3.6 is supported on RH6.7, but I do not see the corresponding ofed-driver package in...
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setup MIC to MIC passwordless ssh
Hello,Is it possible to setup MIC to MIC passwordless ssh?When I ssh from one MIC to another:root@mic0 ~]# ssh mic1 The authenticity of host 'mic1 (192.168.1.21)' can't be established. ECDSA key...
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