Questions tagged [performance]
Questions about software, hardware or network performance. Please use as a supplement for other, more specific tags.
204
questions
17
votes
7
answers
57k
views
How to change the default governor?
I want to change the default governor on my pi from ondemand to performance. Is there a way of doing this?
- 959
3
votes
2
answers
2k
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 ...
- 302
3
votes
3
answers
4k
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 ...
- 302
2
votes
3
answers
5k
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 ...
- 299
4
votes
1
answer
3k
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 ...
- 43
6
votes
2
answers
10k
views
How the usage of ZRam module in Raspberry Pi Kernel improves performance?
zRam increases performance by avoiding paging on disk and instead uses a compressed block device in RAM in which paging takes place until it is necessary to use the swap space on the hard disk drive
...
- 161
4
votes
0
answers
3k
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 ID ...
- 171
1
vote
1
answer
2k
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 ...
- 21
2
votes
1
answer
342
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 ...
- 121
1
vote
1
answer
314
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 ...
- 111
3
votes
2
answers
2k
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 ...
- 1,718
17
votes
3
answers
30k
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 ...
- 325
7
votes
1
answer
3k
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 JPG'...
- 73
6
votes
10
answers
5k
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 ...
- 113
3
votes
1
answer
2k
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 ...
- 205
4
votes
3
answers
4k
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?
- 150
1
vote
2
answers
3k
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 ...
- 111
4
votes
2
answers
6k
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 ...
- 1,608
24
votes
3
answers
34k
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 ...
- 343
4
votes
1
answer
2k
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 ...
- 143
4
votes
1
answer
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 ...
- 950
19
votes
8
answers
49k
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 (...
- 291
2
votes
1
answer
13k
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 ...
- 949
3
votes
3
answers
701
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 ...
- 31
19
votes
8
answers
39k
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 converter ...
- 193
3
votes
0
answers
716
views
Is zero semblance of Xorg rendering performance normal? [closed]
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 ...
- 1,176
33
votes
3
answers
41k
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 ...
- 535
6
votes
2
answers
2k
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 ...
- 161
9
votes
2
answers
1k
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 client'...
- 193
5
votes
7
answers
10k
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 ...
- 428
11
votes
1
answer
7k
views
omxplayer: h.264 bitrates and encoding settings for stutter-free playback
We just received six Raspberry Pi boards with 512mb ram and plan to use them for HDMI playback.
Initial tests were working great with omxplayer, but we are experiencing extreme stuttering issues for ...
- 211
22
votes
6
answers
81k
views
How can I stress test my Raspberry Pi
I recently picked up a battery powered USB cell phone charger and I'm running some tests to see what kind of battery life I will get. Right now I'm just testing at Idle. I want to also run a test ...
- 1,092
5
votes
2
answers
6k
views
Usb disk over network - performance
Using a simple setup with PI as a NAS, with an attached USB disk, like this:
[RPI] (USB) -> Ethernet
-> USB 2.0 Disk
Of course both network and disk access share the same USB port, but ...
13
votes
4
answers
11k
views
SD card write speed seems to be 14 times slower than read speed
I was writing to an SD card this evening from a Mac Book Air internal card reader, and the performance reported was 1.4 MB/sec. I later read tested it on the Raspberry Pi and got 20 MB/sec. ...
- 489
44
votes
3
answers
63k
views
Why does the Raspberry Pi need a MPEG-2 licence?
Since August 24 2012, it is possible to buy a licence to hardware-decode MPEG-2 videos.
Here are my questions:
Does it mean that, without this licence, the RPi cannot handle at all MPEG-2 video, or ...
- 3,693
7
votes
1
answer
2k
views
Could raspberry be a good choice for home monitoring?
I'm not sure if this is the correct thread to ask but I need to start somewhere
What I'm looking to do is small box computer that I can mount on wall near the exit from my house that would monitor ...
- 73
4
votes
1
answer
802
views
How do I connect a DS18B20?
I'm trying to connect a DS18B20 to the GPIOs. I have successfully done so electronically, but I could only code the reset function because it's not that time critical. It is OK for that function to ...
- 1,220
4
votes
4
answers
3k
views
Does Raspberry Pi runs Minecraft and Netbeans 7.2?
I have a computer with 512MB of RAM Memory, CPU Intel Celeron 1.60GHz and a 80GB HD. After the new Minecraft update to 1.3.X, Minecraft don't run on my computer any more even on Windows XP and Lubuntu ...
- 143
27
votes
5
answers
33k
views
Why is my SD card slow?
My SD card seems to be running slow. I have an ADATA 16 GB SDHC Class 10 card. I checked the compatibility list which lists a card with similar specifications, and it states that it is "working". Even ...
- 1,092
48
votes
9
answers
75k
views
Can the Raspberry Pi be used as a media center?
I am looking for a simple solution to play videos and music stored on my NAS.
I've found the Raspberry Pi and projects like OpenElec and RaspBMC which will run XMBC on the board.
My problem is that I'...
- 583
36
votes
4
answers
28k
views
What is the highest performing hardware configuration?
I know that exact benchmark numbers will vary between manufacturers, but in general if you only consider higher end flash drives, SD cards, and USB HDDs and your Raspberry Pi is connected to a network ...
- 2,927
9
votes
1
answer
2k
views
Hard-float and performance
Ever since the official Raspbian image came out, there has been much talking about hard-float - often cited as one of the most prominent Raspbian features, promising "tremendous performance boost".
I ...
user13
65
votes
6
answers
125k
views
How do I determine the current MHz?
I've been trying to get an accurate reading of my Raspberry Pi's MHz, since I overclocked it in /boot/config.txt
My /boot/config.txt is as following:
pi@raspbmc:~$ cat /boot/config.txt
arm_freq=900
...
- 963
25
votes
1
answer
7k
views
How do I turn on Level 2 (L2) cache?
It has been suggested to me that the L2 cache is turned off by default on the Pi, and that turning it on could improve CPU performance (probably at the expense of GPU performance). I'm keen to explore ...
- 2,912
13
votes
2
answers
6k
views
Why does python run relatively slowly?
I've been benchmarking the Pi on some of my simulation codes, relative to a couple of laptops I have. My codes tend to be floating point intensive, so I've been using Raspbian (which turns out to be ...
- 2,912
21
votes
1
answer
7k
views
How can I use a USB HDD to extend the life of my SD Card?
How can I set up a USB HDD to extend the life of my SD Card and maximize the performance of my Raspberry Pi?
Related: How can I extend the life of my SD card?
- 5,883
17
votes
4
answers
35k
views
Can I speed up web browsing on the Raspberry Pi?
Browsing the web using Midori on the Raspberry Pi feels very slow.
I appreciate that the speed at which a web page will load is determined by a number of factors including: the speed of the network ...
- 5,883
30
votes
4
answers
9k
views
Is there anything I can do to improve boot speed?
I love my Pi, but it takes a considerable time to boot. If I want to use it as a Media Centre, it's quite important that it powers up quickly.
Are there any steps I can take to improve boot ...
- 22.5k
32
votes
6
answers
34k
views
What is a typical boot time for the standard Debian distribution on a typical SD card?
How long does the RasPi take to boot when using the standard Debian distribution on a typical SD card? Are we talking less than a second? A couple of seconds? 10 seconds? 100 seconds?
This isn't too ...
- 1,459
23
votes
1
answer
11k
views
Can I stream 1080p video from the Pi?
We all know the Pi can play 1080p video no problem, but is it fast enough to act as the basis for a file server that can stream 1080p video over its wired network connection?
I'm thinking of using ...
- 10.9k