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14
votes
9answers
578 views

Filter file by line number

Given a file L with one non-negative integer per line and text file F, what would be a fast way to keep only those lines in F, whose line number appears in file L? Example: $ cat L.txt 1 3 $ cat ...
3
votes
1answer
47 views

Io redirection vs file logging performance c/c++

Is there a performance difference from a latency point of view if we do a regular printf and redirect stdout to a file when running the program ( e.g., ./a.out > log.txt 2>&1 ) vs using fprintf ...
0
votes
0answers
44 views

How to benchmark performance and ensure high-availability in a CentOS 7 cluster?

To give you a little context on my question, I'd like to mention that I am writing an essay on high performance and high availability clusters using a 2-node (I know that is not optimal, but it's what ...
2
votes
2answers
44 views

Code for submitting job on cluster

I don't know whether this is the right place for posting this question, if not kindly let me know where I can ask. My doubt: I use the following code to submit a job on a cluster, but I don't know ...
0
votes
0answers
63 views

Problems with kerrighed

I heard about kerrighed and i want to use it for rendering with blender because it is a single system image. I tried to install it over pxe like the installation guide from kerrighed.org says. The ...
2
votes
0answers
42 views

Using SLURM without a feature

Suppose my super computer has the following NODELIST's with the included features: NODELIST FEATURES NodeA (none) NodeB specialfeature and I am trying to benchmark ...
1
vote
1answer
117 views

apache mod_security and performance

I have a list of bots to block, so I was thinking that fail2ban could be a solution until I realized that mod_security would be more efficient in this kind of tasks. The number of bots is huge, so ...
1
vote
1answer
188 views

Strategies for building distributed computing system with hybrid Mac and Linux systems

I want to build a distributed computing system to run Matlab, C and other programming languages for scientific computing. Now I've several old Mac machines with Lion Mac OS installed acted as web ...
2
votes
1answer
346 views

tmpfs performance

I use avconv to make screen recording of gameplays on linux (yeah, I'm sorry, I am one of them, but I get more excited about the scripts than playing it self), but recently my harddrive has gone and ...
3
votes
3answers
1k views

Is there a drawback when using a chroot in high performance computing?

My (small) company uses an out-of-date linux (centos) software stack to run a proprietary software on a small cluster. Understandingly, IT is reluctant to upgrade since everything works now. I'd like ...
2
votes
1answer
1k views

How do I make a multi-threaded app use all the cores on Ubuntu under VMWare?

I have a multi-threaded C++ app (using pThreads) that processes a massive flat file that works great on Windows - uses all four cores on my puny CPU. Client wants to run the same code on Red Hat on a ...
37
votes
4answers
4k views

Why is Linux commonly used as operating system for supercomputers?

As of november 2010, Linux is used on 459 out of the 500 supercomputers of the TOP500. What are the reasons behind this massive use of Linux in the supercomputer space?