Finite difference is a simple and efficient mathematical tool that helps solve differential equations. In this paper, we solve an isotropic acoustic 3D wave equation using explicit, time domain finite differences.
Hi, I'm trying to figure out why I get a 20% Haswell slowdown porting some C++ IIR filter loops from AVX128 to AVX256. Advisor's no help as both Check Dependencies and Check Memory Access Patterns always fail with internal errors all variations I've had time to try so far. Find Trip Counts and FLOPS fails too as it eventually causes a crash in the target process; it seems to add no information over Survey Target (which is the only bit of the workflow clearly working) but might reach the loops in question. Output from
Hi, Intel technician,
I am currently using advixe-cl instead of advixe-gui and have produced the text report of survey. However, I cannot view the Fortran source codes corresponding to the advise given in the text SURVEY report. Under Windows, I can view source codes. Under Linux, how can I view the Fortran source codes? of course, options -g, -O3, -simd, -vec, and -qopenmp have been used while building imex.exe with 2017 intel Frotran compiler.
The followings are the commands I used.
HI, Intel technician,
when I ran 2017 intel advisor XE under Linux, the following error occurred
09:08:24: Error: Unable to initialize GTK+, is DISPLAY set properly?
could you do me a favour and give me an advise to fix above problem?
Thanks in advance and I am looking forward to hearing from you.
Apparently, Advisor cannot analyze results for display in Survey Report where cilk_for is in use. The "Why no vectorization?" field shows this comment. The times are quoted as 0. in summary even though they show up with reasonable values ascribed to cilkrts_cilk_for in source and assembly view. I have built with -debug:inline-debug-info -Qipo-.
I have been making a practice of setting -debug:inline-debug-info when building for Advisor. Today I noticed a case where Advisor 17 update 2 misses a vectorized loop in a C function called from Fortran (with all the events linked to the C prolog). This appears to be cured by building with /Qipo-. I don't expect any benefit from ipo (as opposed to ip), so this is a satisfactory method, if only it can be remembered. Qipo- appears to help with analysis of pure Fortran as well.
A colleague teaches a parallel programming course at the University of New Mexico. He'd like to introduce his spring semester class to Roofline.
Is the Parallel Studio XE Cluster Edition, Student Edition the latest version ( 2017 Update 1 at this time)? Does it have the Roofline capability, assuming one adds env var
Will Update 2 remove the need for the ADVIXE_EXPERIMENTAL env var?