User and Reference Guide

Contents

SYNC-MAX-DURATION

Syntax:
SYNC-MAX-DURATION <duration>
 
Variable
VT_SYNC_MAX_DURATION
Default
1 minute
Description
Intel Trace Collector can use either a barrier at the beginning and the end of the program run to take synchronized time stamps on processes or it can use a more advanced algorithm based on statistical analysis of message round-trip times.
This option enables this algorithm by setting the maximum number of seconds that Intel Trace Collector exchanges messages among processes. A value less than or equal to zero disables the statistical algorithm.
The default duration is much longer than actually needed, because usually the maximum number of messages (set through
SYNC-MAX-MESSAGES
)is reached first. This setting mostly acts as a safe-guard against excessive synchronization times, at the cost of potentially reducing the quality of clock synchronization when reaching it and then sending less messages.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.