From b649023949f8a762d193833e192dbae8d53d105e Mon Sep 17 00:00:00 2001
From: Jan David Mol <mol@astron.nl>
Date: Thu, 7 Mar 2019 13:43:31 +0000
Subject: [PATCH] COB-5: Lower MPI polling as it seems to be good enough and
stresses the system less.
---
RTCP/Cobalt/InputProc/src/Transpose/MPIUtil.cc | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/RTCP/Cobalt/InputProc/src/Transpose/MPIUtil.cc b/RTCP/Cobalt/InputProc/src/Transpose/MPIUtil.cc
index fd13cf145dd..d63ccb350c2 100644
--- a/RTCP/Cobalt/InputProc/src/Transpose/MPIUtil.cc
+++ b/RTCP/Cobalt/InputProc/src/Transpose/MPIUtil.cc
@@ -446,11 +446,13 @@ namespace LOFAR {
ScopedLock sl(mutex);
while(!done) {
- // next poll will be in 0.1 ms
+ // next poll will be in 0.5 ms
//
// NOTE: MPI is VERY sensitive to this, requiring
// often enough polling to keep transfers
// running smoothly.
+ //
+ // If the observations do not run at real time, try lowering the polling interval.
if (requests.empty()) {
// wait for request, with lock released
@@ -463,7 +465,7 @@ namespace LOFAR {
// the lock and just wait with a timeout
if (!requests.empty()) {
struct timespec deadline = TimeSpec::now();
- TimeSpec::inc(deadline, 0.0001);
+ TimeSpec::inc(deadline, 0.0005);
newRequest.wait(mutex, deadline);
}
--
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