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- Newsgroups: comp.parallel
- Path: sparky!uunet!gumby!destroyer!gatech!hubcap!fpst
- From: Lutz Prechelt <prechelt@ira.uka.de>
- Subject: MasPar communication measurements technical report
- Message-ID: <1993Jan12.135553.15528@hubcap.clemson.edu>
- Sender: newsadm@ira.uka.de
- Nntp-Posting-Host: i41s18.ira.uka.de
- Organization: University of Karlsruhe, FRG
- Date: Tue, 12 Jan 1993 10:30:49 +0100
- Approved: parallel@hubcap.clemson.edu
- Lines: 67
-
-
- [[ This report has been announced as a draft version a few weeks ago.
- The completed version does not contain any new data. The only changes
- are an additional one page summary of results and some polishing.
- ]]
-
-
- Technical report 1/93 of the University of Karlsruhe, Department
- of Informatics is available. It is called
-
- "Measurements of MasPar MP-1216A Communication Operations"
-
- It shows a variety of timings that have been measured
- for the MasPar router, xnet, and complex library interprocessor
- communication operations. The results are discussed; some are really
- surprising.
- There are some lessons to learn from these results.
- The most shocking one is
- "Sometimes it is better to use router even if xnet would be possible"
-
- Measured operations are:
- router send/fetch, ss/ps/sp/pp_rsend and ss/ps/sp/pp_rfetch,
- (dito for xnet),
- reduce, scan, sendwith, psort, rank, select, enumerate.
- Measurement conditions are:
- Various processor activity patterns (random, regular, block),
- various communication patterns (random, regular, block, shift),
- various packet sizes (1, 2, 4, 8, 32, 128, 256 bytes),
- various segment counts (for 'scan'), etc.
-
- The report has 38 pages and contains 30 diagrams.
- It describes 70 different measurement series with about
- 100 data points each.
- I think this data is a valuable aid for all MasPar programmers.
-
-
- The draft version is available in Postscript format
- for anonymous ftp from
-
- sanfrancisco.ira.uka.de (129.13.13.110) in
- pub/maspar/maspar_measure_report.ps.Z (about 205 kB)
-
- This version prints on A4 paper. If you want to use US-american
- 8.5 x 11 inch paper, get the file
-
- sanfrancisco.ira.uka.de (129.13.13.110)
- pub/maspar/maspar_measure_report_US.ps.Z (about 205 kB)
-
- instead (it contains the same report).
- The measurement program itself is also available as source code on
-
- sanfrancisco.ira.uka.de (129.13.13.110) in
- pub/maspar/maspar_measure_program.tar.Z (about 20 kB)
-
- Remember to use 'binary' mode in ftp, or you will get garbage.
-
- Lutz
-
-
- Lutz Prechelt (email: prechelt@ira.uka.de) | Whenever you
- Institut fuer Programmstrukturen und Datenorganisation | complicate things,
- Universitaet Karlsruhe; D-7500 Karlsruhe 1; Germany | they get
- (Voice: ++49/721/608-4068, FAX: ++49/721/694092) | less simple.
-
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