Cypress CSC-1200T Guía de usuario Pagina 22

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22 Cray T3E User’s Guide
Micro-
processor
Local
Memory
Support
Circuitry
Network
Router
-Z +Z
+Y
-Y-X
+X
Figure 3.1: The components of Cray T3E node.
This is a problem only if you are using the SHMEM library for commu-
nication. The MPI library, for example, handles the streams mechanism
properly.
The streams mechanism can be disabled or enabled on the user level by
using the environment variable $SCACHE_D_STREAMS. To enable streams,
give the command
setenv SCACHE_D_STREAMS 1
before executing your program. To disable streams, set the environment
variable to 0. Use the command udbsee to see whether you have rights
to use the streams mechanism.
You can also set the streams using the C/C++ function
#include <mpp/rastream.h>
void set_d_stream(int ss);
or the Fortran routine
INTEGER :: ss
CALL SET_D_STREAM(ss)
See the manual pages for more details (man intro_streams).
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