xealits

What exactly is "iowait"?

To summarize it in one sentence, 'iowait' is the percentage
of time the CPU is idle AND there is at least one I/O
in progress.

Each CPU can be in one of four states: user, sys, idle, iowait.
Performance tools such as vmstat, iostat, sar, etc. print
out these four states as a percentage.  The sar tool can
print out the states on a per CPU basis (-P flag) but most

xealits

Open Computing Language (OpenCL) is a language and framework for writing computationally intensive kernels that run accross heterogenious platforms, including GPUs, CPUs, and perhaps other more esoteric devices.

Intel provides an OpenCL implementation for Intel CPUs, but there's not a lot of instructions on how to get it set up. Here's what I did.

Installing Intel CPU OpenCL on Ubuntu (12.04)

1. Download the Intel® SDK for OpenCL* Applications XE 2013 from the Intel website, here http://software.intel.com/en-us/vcsource/tools/opencl-sdk-xe. The download is a tarball -- the one I got is called intel_sdk_for_ocl_applications_2013_xe_sdk_3.0.67279_x64.tgz
2. Unpack the tarball and cd into the new directory

xealits

# list the files in EOS
eos ls [-la] /eos/cms/user/t/test/

# copy all inside the directory recursively
eos cp -r /eos/cms/user/t/test/histodirectory/ /afs/cern.ch/user/t/test/histodirectory

# copy a single file
eos cp /eos/cms/user/t/test/histo.root /tmp/ 
eos cp /eos/cms/store/user/Username/Datadir/Data.root .

xealits

#!/bin/bash

export GTAGSLABEL=ctags

if [ -r $PWD/.globalrc ]; then
    GTAGSCONF=$PWD/.globalrc
elif [ -r $HOME/.globalrc ]; then
    GTAGSCONF=$HOME/.globalrc
elif [ -r /usr/local/share/gtags/gtags.conf ]; then
    GTAGSCONF=/usr/local/share/gtags/gtags.conf