1. Assignment 5/9 – 2005 INF 5070 – Media Servers and Distribution Systems:

2. 2005 Carsten Griwodz & Pål Halvorsen INF5070 – media servers and distribution systems Assignment Group size  2 or 3 students per assignment Schedule  3.october: delivery of a project plan  Reason have early ideas concerning test setup, tests to run, etc. opportunity to coordinate with other groups studiereform …  28.november: written report and oral presentation of results  Reason share the results train presenting

3. 2005 Carsten Griwodz & Pål Halvorsen INF5070 – media servers and distribution systems Assignment ideas  Context switch reduction for networking in the Linux kernel For many concurrent TCP connections to the same process  Evaluate Linux schedulers for parallel multimedia transcoding workloads Proposal: o use http://ck.kolivas.org/patches/plugsched/ o cpuse.sf.net patches for collecting results o mencode for transcoding  Interval caching using mmap and madvise IC is explained in week 3 Implement a one-machine, one process test, compare disk I/O with mmap without madvise

4. 2005 Carsten Griwodz & Pål Halvorsen INF5070 – media servers and distribution systems Assignment ideas  Compare Linux’s alternative disk schedulers Implement a single-process, multi-thread benchmark for concurrent reading of streams from disk (to /dev/null) Compare latency and throughput  File system comparisons  Compare C++ binding speed Compare the speed of C++ functions calls under various conditions (static functions, virtual functions, dynamically loaded objects), different x86 CPUs, different compilers Proposal: use the clock cycle counter, RDTSC

5. 2005 Carsten Griwodz & Pål Halvorsen INF5070 – media servers and distribution systems Assignment ideas  Cross-test bandwidth claim of TCP variations Test large file transfers over a bottleneck between 2 pairs of Linux machines with different TCP variations Write your own test, compare statistics only for competing phase  Cross-test TCP and SCTP Use TCP SACK (Linux default) About SCTP API extensions: http://www.ietf.org/internet-drafts/draft- ietf-tsvwg-sctpsocket-10.txt