Andreas Sandberg – PhD Student

I'm not in my office?

Check my calendar, I might be back soon. As an alternative to phone and email, it's usually possible to reach me on IRC. I'm usually connected to FreeNode and EFNet, the nick is sandberg.

Research

I'm a member of the UART group. We specialize in computer architecture, and in particular how computer architecture decisions affect software. Our research mainly focuses on analyzing optimizing performance with respect to the memory system.

Publications

• A simple statistical cache sharing model for multicores. Andreas Sandberg, David Black-Schaffer, and Hagersten Erik. In Proc. 4th Swedish Workshop on Multi-Core Computing, pp 31-36, Linköping University, Linköping, Sweden, 2011. (fulltext).
• A Software Technique for Reducing Cache Pollution. Andreas Sandberg, David Eklöv, and Erik Hagersten. In Proc. 3rd Swedish Workshop on Multi-Core Computing, pp 59-62, Chalmers University of Technology, Göteborg, Sweden, 2010. (fulltext).
• Reducing Cache Pollution Through Detection and Elimination of Non-Temporal Memory Accesses. Andreas Sandberg, David Eklöv, and Erik Hagersten. In Proc. International Conference for High Performance Computing, Networking, Storage and Analysis: SC 2010, p 11, IEEE, Piscataway, NJ, 2010. (DOI, fulltext).
• Efficient detection of communication in multi-cores. Andreas Sandberg and Stefanos Kaxiras. In Proc. 2nd Swedish Workshop on Multi-Core Computing, pp 119-121, Department of Information Technology, Uppsala University, Uppsala, Sweden, 2009. (fulltext).

Software

Most of our research projects require us to develop some code. Our research group makes some of our software available through GitHub.

Teaching

Semester	Course code	Course	What
Autumn 2009	1DT016	Computer Architecture I (distance)
Autumn 2009	1DT051	Information Technology	Labs in digital logic
Autumn 2009	1DT013	Computer Architecture II	Responsible for labs and assignments
Spring 2010	1TT901	Embedded Control Systems	Programming and hardware
Autumn 2010	1DT024	Advanced Computer Architecture	Responsible for labs and assignments
Autumn 2011	1DT024	Advanced Computer Architecture	Responsible for labs and assignments

One of the assignments I developed for the Advanced Computer Architecture course contains a short introduction to SSE. The lab manual and the source code can be used as a standalone introduction to SSE. Feel free to contact me if you have any questions or comments about this material.

Other

Software patches

On some occasions I've fixed a bug or two in some piece of code, but for one reason or the other the bug fix hasn't been included in the upstream release (maybe because I haven't gotten around to send the patch to the right person). Check out my patch dump site for such patches. There are some patches to get Lejos running on Solaris there.

Some of my hacks and projects are available on GitHub. I've started to play around with the HiPE backends some time ago. One of the projects was to port HiPE to PPC64, this work has now been merged with the upstream version.

Hobby

• Hiking - I usually try to go hiking at least a week every year, I particularly like the area around Kebnekaise.
• Sea Kayaking - I try to go for at least one longer kayaking trip on one of the larger lakes or in the archipelago every summer. There are a couple of places where you can rent kayaks around Uppsala. I usually rent kayaks from Friluftsfrämjandet, which also has courses for people interested in trying kayaking. Connos Kajak also seems to have some nice kayaks.
• Scuba Diving - Yes, you can actually go scuba diving in Sweden. I'm currently more or less active in three of the Uppsala clubs, DykUpp, Tumlaren and Uppsala Dykarskola.
• Tour Skaring - There are plenty of good lakes for tour skating within a short distance from Uppsala. Inline skating is a nice alternative if you can't wait for the lakes to freeze.
• Cross-country skiing - Another winter activity, like hiking, but with snow and slightly colder.
• Badminton - I usually play with NNIF. University employees can play for free with the university sports club.
• Climbing - The most recent addition to 'strange stuff I do in my spare time'. Currently only indoors at Campus1477, but I'll probably start to climb outdoors as soon as it gets warm again.

Some of my other hobby projects are listed here.