if (extra->root != 0 || (extra->datatype1 && strcmp(extra->datatype1, "")))
fprintf(trace_file, "%d %s", extra->root, extra->datatype1);
fprintf(trace_file, "\n");
break;
case TRACING_ALLREDUCE: // rank allreduce comm_size comp_size (datatype)
if (extra->root != 0 || (extra->datatype1 && strcmp(extra->datatype1, "")))
fprintf(trace_file, "%d %s", extra->root, extra->datatype1);
fprintf(trace_file, "\n");
break;
case TRACING_ALLREDUCE: // rank allreduce comm_size comp_size (datatype)