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

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0
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3answers
118 views

Is raspberry pi 2 model B a good candidate as a “Download Box” or NAS

I am planning to buy Raspberry pi 2 Model B. Predominantly for two purposes, Download Box (for Torrents, ftp / http downloads) Web Server (For replying some requests to Local Client computers ) and ...
1
vote
0answers
122 views

New PI 2 B+ unusably slow, CPU and RAM not being used?

Just setup a new R Pi 2B+, using raspbian on a 16gb sd card, ethernet, USB mouse/keyboard and HDMI out. Finding it extremely slow - the UI is reasonably responsive however installing monodevelop took ...
2
votes
1answer
47 views

How much performance do I lose, when running the desktop (but not using it)?

Using raspi-config you can decide whether the pi should boot into a desktop environment or not. I only use my pi over ssh so if the desktop is there or not does not matter to me at all. My question ...
1
vote
0answers
58 views

How to avoid high cpu load while using spi with the bcm2835 c library? [closed]

I'm trying to use the bcm2835 c library to get data from an ADC (I'm running raspbian of a raspi B+). So far I've been using the default configuration with success: if (!bcm2835_init()) { ...
0
votes
2answers
4k views

Why is my Raspberry Pi 2 with OSMC slow?

I just installed my new Raspberry Pi 2 B model with the OSMC OS Alpha version 4. While the Pi 2 is supposedly much faster, I experience the device to be not very responsive when navigating the menu's ...
3
votes
2answers
83 views

Can I get better performance on Raspbian if I blacklist a lot of kernel modules in raspi-blacklist.conf?

I have a Raspberry Pi that is being used only for displaying a single webpage. I have the memory split set at 64M for the GPU. The display does not require sound, web-video, usb-devices, user-input. ...
0
votes
0answers
10 views

40Mhz pulse counting and storing count value [duplicate]

I am new to Raspberry pi. I need to count 40 Mhz continuous pulse for every 100 microseconds and store the count in micro SD card before next cycle starts. The process should run for 24 hours. I am ...
1
vote
1answer
177 views

NTFS with high CPU usage

I'm using a RPi B+ with XBian and transmission, and an external USB 2TB disk, which has an external power supply. That disk is NTFS, and I've noticed that the CPU usage of the mount-ntfs process is ...
1
vote
0answers
43 views

How can I tell if Java is performing properly?

There are many different versions of Java and many instructions on how to install the fastest Java version on a Raspberry Pi. How can I tell if the one I've installed is using hard floats? Are there ...
0
votes
1answer
183 views

Weak performance during motion detection with picamera and python script

To dig into the picamera python api i just started a simple motion detection script. It runs in the videomode with 2 frames/second and a resolution of 320x240. Frames are captured with the ...
0
votes
0answers
118 views

RetroPi on B+ - Slowness, music glitches when WiFi connected

I have a B+ with retropie 2.3 installed. I've sucessfuly connected a TP-Link TL-WN722N WiFi dongle. It seems that most roms run slower and have music glitches when dongle is connected. When I ...
3
votes
1answer
374 views

Execution time performance when counting up to 1,000,000,000

I have made a simple C++ program that simply counts up a variable to 1,000,000,000 and then displays the time it took. I used a simple for loop to do this. for(long n=0;n<1000000000;n++); The ...
1
vote
1answer
155 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 Meta + Arrow doesn't work, but changing screen's window with Ctrl + A # works, so, ...
2
votes
1answer
83 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
votes
0answers
110 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
votes
2answers
71 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
vote
1answer
85 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
vote
3answers
149 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
vote
0answers
138 views

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

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
vote
1answer
174 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
votes
0answers
100 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 ...
1
vote
0answers
78 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
589 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
votes
0answers
102 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
189 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
votes
1answer
300 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
156 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
484 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
491 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
votes
0answers
529 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
858 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
3k 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
254 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
89 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
94 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
105 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
17k 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
346 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
430 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
254 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
794 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
246 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
3k 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
178 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 ...
3
votes
1answer
472 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
603 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
3answers
4k 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
641 views

Can't connect RFCOMM socket: Permission denied [closed]

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
906 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 ...