bump mpiio module version and print warning on old

darshan-mpiio-log-format.h

@@ -8,7 +8,7 @@
 #define __DARSHAN_MPIIO_LOG_FORMAT_H
 
 /* current MPI-IO log format version */
-#define DARSHAN_MPIIO_VER 1
+#define DARSHAN_MPIIO_VER 2
 
 /* TODO: maybe use a counter to track cases in which a derived datatype is used? */
 

darshan-util/darshan-mpiio-logutils.c

@@ -64,7 +64,7 @@ static int darshan_log_get_mpiio_file(darshan_fd fd, void** mpiio_buf_p)
         if(!file)
             return(-1);
     }
-
+    
     ret = darshan_log_get_mod(fd, DARSHAN_MPIIO_MOD, file,
         sizeof(struct darshan_mpiio_file));
 
@@ -165,6 +165,12 @@ static void darshan_log_print_mpiio_description(int ver)
     printf("#   MPIIO_F_*_RANK_TIME: fastest and slowest I/O time for a single rank (for shared files).\n");
     printf("#   MPIIO_F_VARIANCE_RANK_*: variance of total I/O time and bytes moved for all ranks (for shared files).\n");
 
+    if(ver < 2)
+    {
+        printf("\n# WARNING: MPIIO module log format version 1 has the following limitations:\n");
+        printf("# - MPIIO_F_WRITE_START_TIMESTAMP may not be accurate.\n");
+    }
+
     return;
 }