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6
votes
3answers
590 views

zsync vs. jigdo

What's the difference between zsync and jigdo? Their core functionality seems the same, so I'm curious on things like performance, file size, and ease-of-use. Would also be interesting to know why one ...
6
votes
5answers
3k views

Sync writes very slow. Ubuntu 10.10, 32 bits, ext4

I am running ActiveMQ on my Macbook Pro that runs Ubuntu 10.10, 32 bits with an ext4 partition. Linux iker-laptop 2.6.35-23-generic-pae #40-Ubuntu SMP Wed Nov 17 22:32:51 UTC 2010 i686 GNU/Linux If ...
6
votes
2answers
698 views

I/O-overhead of dm-encrypted device?

What would be the Read-/Write-overhead when using dm-crypt (LUKS) as full disk-encryption (including root partition) on a Linux-Desktop (Ubuntu)? I plan to stack it like so: LUKS > LVM > ext4 The CPU ...
14
votes
5answers
6k views

Is there a parallel file archiver (like tar)?

Is there something out there for parallel archiving of files? Tar is great, but I don't use tape archives, and it's more important to me that the archiving happens quickly (with compression like ...
72
votes
7answers
16k views

Why use swap when there is more than enough RAM

Using swap space instead of RAM can drastically slow down a pc. So why, when I have more than enough RAM available, does my Linux system (Arch) use the swap? Checkout my conky output below: ...
1
vote
0answers
281 views

Array Performance very similar to LinkedList - What gives? [closed]

So the title is somewhat misleading... I'll keep this simple: I'm comparing these two data structures: An array, whereby it starts at size 1, and for each subsequent addition, there is a realloc() ...
2
votes
4answers
5k views

What is “System Memory ” displayed in nmon in AIX?

I have a host with AIX 6.1 (6100-04-02-1007) upgraded from AIX 5.1 with Veritas Storage Foundation 5.1. Since the upgrade from AIX 5.3 to 6.1, Run vx services means a lots of memory consumed that I ...
6
votes
4answers
207 views

Quantify unix responsiveness

I am one of the n users of a shared unix machine. For reasons unknown, the machine is not "responsive" enough. For example, it is slow on interactive commands, it takes few noticeable moments for any ...
6
votes
2answers
4k views

Diffing two big text files

I have two big files (6GB each). They are unsorted, with linefeeds (\n) as separators. How can I diff them? It should take under 24h.
3
votes
2answers
676 views

Does the Linux PreemptRT patch benefit desktop users?

Does the PREEMPT_RT patch (real-time kernel) have any benefit for regular desktop users?
14
votes
2answers
2k views

Measure pipe throughput in the shell

There is a shell command that allows to measure how fast the data goes through it, so you can measure the speed of output of commands in a pipe. So instead of: $ somecommand | anothercommand you ...
20
votes
11answers
6k views

the lightest way to have a GUI in Linux?

I have been using Gnome and KDE for a while, and I am now running Compiz standalone... Regarding system resource, I think the most heavy ones are feature-rich desktop environments (Gnome, KDE), then ...
8
votes
2answers
1k views

Heavy write activity on SSD nukes system performance

I've noticed that when I do heavy write applications, the whole system slows down. To test this further I ran this to do a (relatively) low-CPU, high disk activity: john -incremental > file_on_SSD ...
4
votes
5answers
5k views

Why is this network connection so slow?

I am having some problems with network performance speed on a Linux server running Ubuntu 9.10. Transfer speeds on all types of traffic are around 1.5MB/s on a 1000mbit/s wired ethernet connection. ...
5
votes
5answers
2k views

How do you free up resources in Ubuntu?

What steps do you take to make a vanilla Ubuntu system run faster and use less memory? I'm using Ubuntu as the OS for my general purpose PC, but it's on slightly older hardware and I want to get as ...
11
votes
1answer
521 views

How do I go about tracking down IO usage in Linux and other *nix OS'?

Occasionally, something on my system starts hammering the disk. I would like to log data that would let me know about I/O usage per process, then I could go back to it later and see what keeps doing ...
7
votes
2answers
805 views

Has anyone got any performance numbers comparing IIS and .NET to Cherokee and Mono?

I am setting up a development server and want to set it up to serve ASP.NET pages using Mono. I am planning on using Cherokee and Mono (http://www.cherokee-project.com/doc/cookbook_mono.html) and ...
25
votes
12answers
2k views

How can I tweak my Linux desktop to be more responsive?

I have the experience that Linux works fine until the physical memory is exhausted. As soon as swap space is used the performance is severely degraded and the GUI becomes unresponsive. This problem ...