Bug 4146 - Performance problems with RichTextBoxes.AppendText und Linux
Summary: Performance problems with RichTextBoxes.AppendText und Linux
Status: NEW
Alias: None
Product: Class Libraries
Classification: Mono
Component: Windows.Forms ()
Version: 2.10.x
Hardware: PC Linux
: Lowest normal
Target Milestone: Community
Assignee: Bugzilla
Depends on:
Reported: 2012-03-29 06:49 UTC by Karl Lueger
Modified: 2017-09-01 11:56 UTC (History)
1 user (show)

Tags: mono-community
Is this bug a regression?: ---
Last known good build:

The test program illustrating the performance loss. (19.88 KB, application/x-zip-compressed)
2012-03-29 06:49 UTC, Karl Lueger

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Description Karl Lueger 2012-03-29 06:49:57 UTC
Created attachment 1601 [details]
The test program illustrating the performance loss.

We are developing a GUI application logging frames sent by remote Devices. We developing the linux part with Mono for Visual Studio 2008.

currently we are using

- Mono for Visual Studio 2008 Version 2.0.7180

- OpenSuse 11.4, Mono JIT xompiler version 2.10.6 or 2.8.2

Desktop computer properties:
3,5 GB RAM, 4x 2.83 GHz, Windows 7 32-bit

We have serious performance problems when writing text into a RichTextBox with a high rate. Now we wrote a test program that just writes lines (~70 characters) into a RichTextBox in a loop. Under Windows everything works fine so far. The rate is about 1 line per milisecond. Under openSuse and Mono the operations slows unacceptably down to a period of about 15ms per line.

What configuration we could perform to get the performance to acceptable rates? Let's say to 300-400 lines per second. Any Advice? Is it a defect?

I attached a test program. With this you can reproduce the observed behavior (see method btnStart_Click). To show that no other parts of the loop causing the problem we alternatively wrote the same stream to a file. In this case the lines are written at given rate without obvious performance loss. You can easily sitch between two modes (writting to file or to RichTextBox).