Limit search to items available for checkout
Title I/O performance measurement on Cray-1 and CDC 7600 computers.
Imprint Los Alamos, N.M. : Los Alamos National Laboratory, 1980.


 GovDocs Federal/Fiche  E 1.28:LA-8467-MS    AVAILABLE
Description 11 pages : 11 ; 28 cm
Note Published through the Information Bridge: DOE Scientific and Technical Information.
Computer performance evaluation users group conference, Orlando, FL, USA, Oct 1980.
Subject Computer systems ǂx Performances.
Computer input-output equipment ǂx Performances.
Summary Disk I/O transfer rates and overhead CPU times were measured as functions of buffer size and number of logically independent I/O channels for several operating systems and 16 I/O routines on the Cray-1 and CDC 7600 computers. By parameterizing the codes for a variable number of channels, buffer sizes, and words transmitted, the effect of these variables is observed for buffered, nonbuffered, and random-access I/O transmissions. To measure CPU-overlapped performance, I/O was performed concurrently with a pretimed compute loop. Rates, sector overhead, and CPU transmission speeds were calculated upon completion of I/O. Effects of memory blocking due to vector operations were observed. Methods and results are presented. 4 figures, 1 table.
Other Author Los Alamos Scientific Laboratory. Researcher .
Los Alamos National Laboratory. Researcher .
United States. Department of Energy. Office of Scientific and Technical Information. Distributor.