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Use default numCompletionVectors if disni returns negative. #32

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Use default numCompletionVectors if disni returns negative. #32

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6 changes: 5 additions & 1 deletion src/main/java/org/apache/spark/shuffle/rdma/RdmaNode.java
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Original file line number Diff line number Diff line change
Expand Up @@ -232,8 +232,12 @@ private void initCpuArrayList() throws IOException {
};

final int maxCpu = Runtime.getRuntime().availableProcessors() - 1;
int numCompletionVectors = listenerRdmaCmId.getVerbs().getNumCompVectors();
if (numCompletionVectors <= 0) {
numCompletionVectors = 1;
}
final int maxUsableCpu = Math.min(Runtime.getRuntime().availableProcessors(),
listenerRdmaCmId.getVerbs().getNumCompVectors()) - 1;
numCompletionVectors) - 1;
if (maxUsableCpu < maxCpu - 1) {
logger.warn("IbvContext supports only " + (maxUsableCpu + 1) + " CPU cores, while there are" +
" " + (maxCpu + 1) + " CPU cores in the system. This may lead to under-utilization of the" +
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