DXT parser output: change pthered ID from -1 to N/A when not available

Author: wkliao

darshan-util/darshan-dxt-logutils.c

@@ -458,7 +458,7 @@ void dxt_log_print_posix_file(void *posix_file_rec, char *file_name,
             if (rec->num_comps) printf("  ");
         }
         if (mod_ver[DXT_POSIX_MOD] == 1)
-            printf("   -1\n");
+            printf("   N/A\n");
         else
             printf("   %-20lu\n", io_trace[i].pthread_id);
     }
@@ -508,7 +508,7 @@ void dxt_log_print_posix_file(void *posix_file_rec, char *file_name,
         }
 
         if (mod_ver[DXT_POSIX_MOD] == 1)
-            printf("   -1\n");
+            printf("   N/A\n");
         else
             printf("   %-20lu\n", io_trace[i].pthread_id);
     }
@@ -557,7 +557,7 @@ void dxt_log_print_mpiio_file(void *mpiio_file_rec, char *file_name,
         printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f  ", "X_MPIIO", rank, "write", i, offset, length, start_time, end_time);
 
         if (mod_ver[DXT_MPIIO_MOD] <= 2)
-            printf("   -1\n");
+            printf("   N/A\n");
         else
             printf("   %-20lu\n", io_trace[i].pthread_id);
     }
@@ -571,7 +571,7 @@ void dxt_log_print_mpiio_file(void *mpiio_file_rec, char *file_name,
         printf("%8s%8" PRId64 "%7s%9d%16" PRId64 "%16" PRId64 "%12.4f%12.4f  ", "X_MPIIO", rank, "read", (int)(i - write_count), offset, length, start_time, end_time);
 
         if (mod_ver[DXT_MPIIO_MOD] <= 2)
-            printf("   -1\n");
+            printf("   N/A\n");
         else
             printf("   %-20lu\n", io_trace[i].pthread_id);
     }