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

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0answers
51 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
vote
0answers
37 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
89 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
101 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
94 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
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3answers
259 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
148 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
362 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
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1answer
777 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
148 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
70 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
83 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 ...
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vote
1answer
65 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
11k 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
265 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
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1answer
297 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
171 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
499 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
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4answers
184 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
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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
156 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
312 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
353 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
2k 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
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0answers
449 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
644 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
164 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
223 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
463 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
4k 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
855 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
1k 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
490 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
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3answers
14k 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
407 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 ...
4
votes
1answer
2k views

SMB performance issues on Raspbmc

I'm having some serious performance issues (i think) using raspbmc to stream videos/music from my windows XP machine. The setup is as follows: In the attic : Windows XP P4 3.4Ghz 4Gb ram, edimax ...
1
vote
0answers
169 views

Interfacing external device using accurate high-speed clock signal

I need to interface device using specific synchronous protocol that requires clock signal within 1..2MHz. Period instability shouldn't exceed 10%. Also, in certain condition protocol requres clock ...
13
votes
9answers
41k views

Will a Raspberry Pi perform well with XBMC and many movies?

I have a library with more than 1000 movies and I'm searching for a cheap but good performance media centre system. I've been using a Xtreamer Prodigy until now but it's firmware's a little slow ...
0
votes
1answer
1k views

Benchmark USB HDD

I'm using an external USB 2.0 HDD to extend the storage of the Pi which holds my movie-collection. I'm experiencing problems with skips when playing HD movies (720p / 1080p). Also, when transferring ...
2
votes
3answers
331 views

How Viable is an RPI Laptop?

I've been seriously looking into making one of the Raspberry Pi Laptops that have been floating around using the Motorola Atrix Lapdock solution found here and here. The whole reason for doing this ...
9
votes
7answers
10k views

Is Pi powerful enough for an oscilloscope project?

My goal is to make Pi based instruments, starting with an oscilloscope. So I read answers to What Analog to Digital Converters Are Available For RPI? How can I connect an analog to digital ...
2
votes
0answers
373 views

Is zero semblance of Xorg rendering performance normal?

I'm trying to setup a simple little configuration running a dedicated piece of software to display slides. Unfortunately the software uses some OpenGL extensions. No 3D mind you, just some basic font ...
8
votes
2answers
5k views

What speed can I expect from the hardware-H264-encoding?

I stumbled over the Wikipedia-article that the Broadcom GPU has hardware support for encoding H.264/AVC, not only de-coding. I also found an article where someone gave an example using ffmpeg to ...
5
votes
1answer
795 views

Industrial applications

I've been wondering what's the durability of the RPI and the maximum temperature it can operate on. Is it possible to use it to replace some industrial computers? I'm thinking set-top boxes for ...
6
votes
2answers
483 views

X forwarding and GPU memory allocation

I run my Raspberry Pi headless and typically use X forwarding to run applications. I'm wondering what split I should use for allocating the RAM. I am not sure whether it is the server or the ...
4
votes
7answers
5k views

What is the lowest power, most compatible, most compact usb wi-fi adaptor that works out of the box with the Raspberry Pi?

It seems that several people (myself included) are having great difficulty getting different wi-fi adapters to work reliably with the Pi. Some adaptors seem to require excessive amounts of power and a ...