Questions about software, hardware or network performance. Please use as a supplement for other, more specific tags.

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1
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0answers
24 views

Is it normal to irssi freezes when receiving dcc?

I'm running it over screen with Raspberry Pi Model B, but when a streaming begins, I am unable to type anything, even Alt + Arrow doesn't work, but changing screen's window with Ctrl+A + # works, so, ...
2
votes
1answer
42 views

How to make an kiosk type application for the car? [closed]

How would I create an application that is the first and only thing a user sees? I want to create an application for my car. The app will need to boot as quickly as possible and completely take over ...
0
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0answers
20 views

Is it possible to run Pantheon on ArchLinux with bearable performance? (B+)

I received my Raspberry Pi B+ in the mail today and Pantheon is one of my favourite desktop environments. My question is if it possible to run it with decent performance? By requirements you could but ...
0
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2answers
30 views

Optimising raspbian performance for python script

(I know this is probably the most overkilled question but) I've designed a pretty heavy code/script in python, which yes would of been better implemented on c, but in saying that short of over ...
1
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1answer
37 views

Does my raspberrypi take up resources if I startx but remote ssh into the machine?

I was wondering how to get the best performance out of my pi and currently the gui is started with starx automatically on boot, however I intend on using the pi remotely. My question then is: does ...
1
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3answers
102 views

Is Raspberry Pi powerfull enough for commercial web development?

I'm considering buying a raspberry for everything work related, especially software development for the web, since i'm a software engineering student and web start up founder. I would like to know if ...
1
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0answers
54 views

Stream unencoded raw video bit data to a machine with a good GPU to speed up video processing time?

I have a Pi B+ and a HD USB Webcam, as well as an improved wifi card (300Mbps). I am working on a research project where I want to build multiple 'camera units' (lets say 3 as an example). each camera ...
1
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1answer
131 views

State of art in performance of Raspbmc

I'm using Raspbmc and it's awesome. But i feel a (in my opinion) huge delay to load videos. So I started to find bottlenecks. So here are my changes: Using a very good quality SD card, which has a ...
0
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0answers
57 views

Raspberry Pi variant or alternative for MAME

I have recently been trying to use a Raspberry Pi as a MAME arcade machine, and some of the more advanced games will not run with enough performance to be playable. Are there more powerful Raspberry ...
0
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0answers
41 views

Running a webserver unikernel on RaspberryPi

Is there anyone who have tried to install a webserver unikernel on a Raspberry? In both cases, is it something possible and could one run an efficient webserver from it? What are your thoughts on ...
0
votes
1answer
116 views

Optimising ImageMagick Conversions for Raspberry Pi

I've been working with ImageMagick on the Raspberry Pi (model B) and have noticed a bottle neck in the area of image conversions. When converting between bmp, jpg, png, etc. the speeds are acceptable ...
0
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0answers
79 views

Fast os for Raspberry Pi

I'm creating a project with raspberry pi and I need an "os" which boots in a few seconds when the power is turned on. The os has to have the following features: audio driver (3.5mm) c/c++ running ...
1
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0answers
110 views

Is RaspberryPi OpenCV fast enough to run eye blink recognition?

I would like to create application that can recognise eye blink recognition on RaspberryPi with Raspberry Pi Noir camera. Eye blinks are fast, so I will have to process many frames per second. Is ...
4
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0answers
153 views

How to achieve gpu_mem=8?

I see some people claiming (see links) they have a memory splitting of gpu_mem=8, but I always thought 16/496 is the minimum split? Here is an answer on this very page: ...
5
votes
2answers
111 views

Why has Raspbian enabled swap by default if that is bad?

I always read that swap on a Pi should be disabled because enabling it lowers SD card lifetime and is very slow anyways (no performance gain with swap). So I disabled it. But is there a good reason ...
1
vote
1answer
230 views

How many applications can a single, optimized SSH-only Raspberry Pi B handle?

How many "passive, common, server-like tasks" can a single home-used RPi perform in parallel? There are many things you can have a RPi serving, like a NAS, a webserver (PHP+SQL), a git repository, a ...
2
votes
3answers
320 views

Raspbian is very sluggish. Almost unusable

This is my first time posting in this forum. I have the Model B board 512mb version, a class 4 16gb SDHD. I bought my Raspberry Pi yesterday and tried to load Arch Linux with no avail. I am a fairly ...
0
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0answers
360 views

Squid + SquidGuard + adblock, performance issue

I want to use my rpi as proxy: cache + blocker Cache is working but when I add SquidGuard with the mozilla adblock expressions it becames so slow! Have you tried it? If yes, is it slow? Did you try ...
3
votes
1answer
535 views

Raspberry Pi + ASIX AX88772: poor performance as a LAN/Broadband gateway?

In a bid to quieten my room, I'm attempting to replace a generic box (2 nics) with an ARM (raspberry pi, the 512mb model) as my Internet gateway/firewall. My research selecting components, lead me to ...
0
votes
1answer
1k views

Speed up samba media performance

I have my RPi media server setup using an external HDD mounted using ntfs-3g (ntfs formatted needs to mount on windows) and Samba to share the drive in the network. Currently, I have 1 client (MacBook ...
0
votes
1answer
189 views

How to choose between an all-in-one server or multiple Raspberry Pi?

I have one Raspberry Pi (with 256MB of RAM) and a lot of ideas to do with it. For example: Download center with transmission, amule, etc. Web server with static webs (or few PHP code) and few visits ...
2
votes
1answer
81 views

Transputer Emulation

Given that next year is the 30th anniversary of the Inmos Transputer, I'd like to try to set up a sort of emulation of the distributed architecture using the RPi. Although I'm only at the planning ...
2
votes
3answers
87 views

Performance drops after a few seconds

I am running a computer vision program on a Raspberry Pi (Linux raspberrypi 3.10.19+), and when it firsts begins, each iteration of the main loop runs in 6 ms. After a few seconds, the time per loop ...
1
vote
1answer
75 views

Which config ? tomcat nat or combo tomcat+mod_jk+apache

I just received my Raspberry pi which I plan to use for a gwt webapp. In performance view, what will be better to do ? only tomcat with NAT to serve my http external port serving static content ...
2
votes
2answers
13k views

Can you make a high-power NAS from a Raspberry Pi?

I am completely new to Raspberry Pi, and don't know a lot about it. My knowledge on hardware, software and programming (except for basic Python) is also very limited. However, I read you can make a ...
1
vote
0answers
283 views

CPU usage is at 100% for the first 90s after GUI loads

I don't generally use the GUI, but included it in case I needed to test my raspi camera. Now I don't know what the technical terms are, so I'll describe as I go. After I enter the GUI the little CPU ...
0
votes
1answer
326 views

RaspberryPi program takes 100% cpu [closed]

Why my program takes 100 % CPU even if its a helloworld program. Is it normal behavior?. Can anyone tell me the reason for this?. I am using debian wheezy. Here is the screen shot of process.. ...
2
votes
1answer
197 views

Fast, Userland GPIO

I need fast (>10 Khz) userland access to the GPIO pins. Are there any options available? /sys/class/gpio based GPIO is too slow (I've tested it), and having to have your application run as root is ...
1
vote
1answer
563 views

Slow file transfer to USB thumbdrive

Currently my files are transferring at a speed of 10 kilobytes/s or less to a thumbdrive that is Fat32 formatted. I have a pretty stock Raspian install, and I've done an rpi-update. I am using a ...
1
vote
4answers
199 views

Which would be faster? Computing 2000 MD5 hashes on the fly or cache them on SD?

Without going much into details, I'll have a Pi working as a game server. Players make requests to that server. For each player, the Pi will have a table of pre-computed MD5 hashes corresponding to ...
1
vote
2answers
2k views

RPi extremely slow download speed

I am trying to set up my Raspberry Pi as a small home server, and I am having issues with my download speed. My Windows PC is getting up to 6mb/s, the Raspberry Pi is doing a dist-upgrade, and is ...
3
votes
1answer
164 views

What kind of data rate can I expect from the Raspberry Pi's MPEG Hardware codec?

What kind of data rate can I expect the hardware coded to decode smoothly? While playing a video on VLC Player, I can choose Tools > Media Information > Statistics Tab Here I can see the bit ...
2
votes
1answer
373 views

Finding cards optimized for random read/write

In a recent article on the official Pi site the authors mention that a class 4 SD card which is optimised for random read/write can be faster than a class 6 or even a class 10 card which is optimised ...
1
vote
2answers
425 views

When does the OS kill an application?

I have an application which polls a bunch of servers every few minutes. To do this, it spawns one thread per server to poll (15 servers) and writes back the data to an object, however sometimes the ...
2
votes
2answers
3k views

Max MB/s down from BT Sync?

The maximum speed of my Pi can get is about 1.8 MB/s down when using BitTorrent Sync. On the same network, my MacBook Air is BT Sync at 9 to 10 MB/s down. 512MB model no swap both Pi and MacBook Air ...
3
votes
1answer
2k views

Image processing on embedded system - raspberry PI or other board?

I need to write a program that does some LK optical flow calculations on an USB webcam feed using OpenCV. This has to be on an embedded system. I currently own a Raspberry PI revision A coupled with ...
3
votes
0answers
494 views

Can't connect RFCOMM socket: Permission denied

00:1A:7D:11:C0:66 is a headset. sdptool search --bdaddr 00:1A:7D:11:C0:66 HS results in Searching for HS on 00:1A:7D:11:C0:66 ... Service Name: Headset Service RecHandle: 0x10001 Service Class ...
1
vote
1answer
697 views

Playing M4V files (H264) via Wifi on iOS using the RPi as an Access Point doesn't work

I want to play videos, located on an USB disk which is connected via a powered USB hub, on my iPad(s). I converted these videos from .MKV to M4V (H264 codec) with HandBrake on Windows 7 using the ...
2
votes
1answer
173 views

is 1.3mB/s as good as it gets for transferring files to a NTFS drive attached to the Pi via a samba share

I have just set up my pi with a couple of different distros (first the squeeze that came installed on it, then the wheezy (but that wouldn't initialise the USB drive ie light never came on and pi ...
1
vote
1answer
233 views

Striping down for java/swing only thin client

Very important note: This same question is also asked at the raspberry pi forums. I guarantee to copy answers from here to there with correct credentials. Hello everyone I am currently developing a ...
2
votes
2answers
477 views

Does dust accumulation on raspberry pi causes heating problem

My raspberry pi is placed where a lot of dust accumulates on the surface.I recently checked and there was a layer of dust settled on it. I cleaned up the device and restarted it. To my surprise, Its ...
7
votes
2answers
5k views

CUPS is too slow, how can I make it faster?

I'm using CUPS for my Samsung CLP-315. It works very well, but it is too slow. It normally takes five minutes or more to print a single page (from pdf). When it's printing, gs is taking 100% of the ...
4
votes
1answer
1k views

How do I improve speed of photo/image resize? (~8MB to ~100KB)

I'm building a program which reads photos off an SD Card then resize the images and upload them to Flickr (note, it's a second SD Card reader, not the one on-board) The photos are high-resolution ...
5
votes
5answers
2k views

Can the original StarCraft be played on LAN with a Raspberry Pi?

Update! StarCraft has been ported to ARM: Reddit discussion Hacker News discussion Geek.com article Download: http://repo.openpandora.org/?page=detail&app=package.starcraft So, I've unaccepted ...
3
votes
1answer
605 views

Would Scrapy Be Ok To Run on A Raspberry Pi?

I'm thinking of getting a raspberry pi to do some scraping work so i can go out while everything continues to run while at home. Is there any reason why Scrapy would be a bad idea for a Raspberry Pi ...
3
votes
2answers
1k views

Expected User Limit of IRC Server on Pi 512 MB?

Does anyone have a clue of the maximum number of users RPi 512 MB could handle if running an IRC server? I'm just looking for an approximate number, is it 100, 10'000 or millions?
0
votes
1answer
2k views

Hadoop on the Pi

I've seen a couple of articles claiming to build a "super computer" using several Raspberry Pis. I know the processing power of the Raspberry Pi is relatively slow so you're not going to be simulating ...
1
vote
1answer
1k views

Performance difference Raspbian versus Gentoo

Is there a measurable difference in CPU performance between Gentoo and Raspbian? With Gentoo you use different compiler flags and with the USE flags compile only what you need. In Raspbian all ...
15
votes
3answers
15k views

Where is the bottleneck of web browse speed on raspberry pi?

On a Model B 512 MB Pi with Raspbian “wheezy”, I have tried Midori, Chromium and Iceweasel. When the web page gets larger, loading is slow, even after I overclocked it to 1 GHz. On an Android phone ...
3
votes
1answer
444 views

Comparison of Python Gui performances

I am building a data visualization application. It is a multithreaded Gui without user interaction. I have 24 widgets that shall be updated any 100ms. 16 widgets are PyCairo rectangles and the other 8 ...