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3
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0answers
24 views

SoftIRQs and Fast Packet Processing on Linux network

I have been reading about performance tuning of Linux to get the fastest packet processing times when receiving financial market data. I see that when the NIC receives a packet, it puts it in memory ...
0
votes
0answers
15 views

server load and performance testing

Dears, there are some cluster of servers that are responsible for a telecommunication company databases. the OS's was Linux Redhat installed on bare metal till now, but all the clusters are migrating ...
0
votes
0answers
14 views

Linux has horrible battery life on high end laptop [duplicate]

I'm running 64 bit mint 17.3 cinnamon on my lenovo yoga 2 pro (4th gen i7, 8 gb ram, ssd). It has a quad hd 3200x1800 resolution display. I realize this is most likely bottle necking my battery life. ...
0
votes
0answers
52 views

problem with ABAQUS job on Rocks cluster

I created ROCKS6 cluster and i installed ABAQUS on my cluster and it works well on frontend, but i can not submit job on my 2 other compute nodes. I just want to run ABAQUS on this cluster (frontend ...
0
votes
0answers
86 views

How to install ABAQUS software on Rocks cluster 6.2

First of all sorry for my english. I create a new cluster with 3 . which one of them is frontend and two of them is compute . i should notice that, i am newest in linux and linux hpc clustering. I ...
1
vote
0answers
39 views

Restoring in-memory/swapped page state on resume from hibernation

I'm a big fan of Linux's hibernation support, which works extremely well on all the (admittedly slightly older) hardware I've tried it on. I highly prefer it to full shutdown and power up. There's ...
0
votes
0answers
61 views

why writing under ram disk is slower than reading?

I have been running a test to verify the performance improvement with ram disk. I used tmpfs provided by Linux kernel,but writing speed is slower than reading. Who had run similar tests and what's ...
0
votes
0answers
263 views

default cpu affinity

On a CentOS 6 system with 32 cores, what could make all processes run under core 0 only? This is a system running nothing but a few stunnel processes actively. This is not a system we would set IRQ ...
16
votes
9answers
1k 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 F....
3
votes
1answer
209 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 ...
2
votes
2answers
202 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 ...
3
votes
1answer
85 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
220 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
334 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
475 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
2answers
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 ...
38
votes
4answers
5k 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?