Intel® Moderncode for Parallel Architectures

An M/M/n queuing model simulation

 

Hello,

An M/M/n queuing model simulation with Object Pascal and my Thread Pool Engine - version 1.02

You can download it from:

http://pages.videotron.com/aminer/

Read more bellow...

Author: Amine Moulay Ramdane

Description:

It's harder and sometimes impossible to get analytical results about waiting times and queue length for general interarrival and service distributions; so, it's important to be able to estimate these quantities by observing the results of simulation.

Pointers defined in modules and OpenMP

I am working with a program (which I did not write) which has a pointer to a derived type in a module;

module X
type mytype
    integer x, y, z
end type mytype
type (mytype), pointer :: p_mt
end module X 

 

This module is accessed in a subroutine;

subroutine Loop
use X
p_mt  => GoGetOne()
p_mt % x = 7.0
...

So far, so good. However, subroutine Loop is accessed from with a parallel loop in another subroutine;

 

2 CPUs vs num_threads

I have 2 xeon CPUs in the PC, each has 4 cores. However, I can only set num_threads to 4. If I set it to a number > 4, I get a message:

OMP: Error #136: Cannot create thread.
OMP: System error #8: Not enough storage is available to process this command.
OMP: Error #178: Function GetExitCodeThread() failed:
OMP: System error #6: The handle is invalid.

Is it not possible to use all the cores in the system because they are distributed across 2 cpus or why is this happening?

(Compiler: Intel C++ 13.0
OS: Windows server 2008 R2)

RTM abort due to RTM_RETIRED.ABORTED_MISC5

Hi there,

I drop a piece of CPU-bounded code into the Linux Kernel with local interrupt disabled. The code is surrounded by RTM instructions. On average, the code commits successfully within around 100 tries. On abortion, the reason reported by PMU is RTM_RETIRED.ABORTED_MISC5  I wonder what would be the reason provided that the local interrupt has been disabled?

PS. The description of RTM_RETIRED.ABORTED_MISC5: none of the previous 4 categories (e.g. interrupt).

Thanks in advance.

BR,

Le Guan

MultiThreading with MKL library nonlinear least square solver

Hello everybody, 
I am using the intel solution for Nonlinear Least Squares Problem with Linear (Bound) Constraints
http://software.intel.com/sites/products/documentation/hpc/mkl/mklman/GUID-B6BADF1C-F90C-4D30-8B84-CF9A5F970E08.htm#GUID-B6BADF1C-F90C-4D30-8B84-CF9A5F970E08

Question: what do I need to do to run the optimizer in parallel?

threading

I have intel i3 processor on my laptop. though it has 2 cores it can run 4 threads at a time. When I see task manager I see programs with 11 threads , 40 threads. How are these threads scheduled? is it hardware implemented or managed by the host OS?

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