WRF-IO: remove setting hints of cb_nodes and nc_num_aggrs_per_node

Also enable command-line options "-r" and "-w" to take a list of file names
separated by commas, so it can run multiple write/read benchmarks, each
using a different output/input file. For reads, this can avoid file system
caching effect. For writes, there should be no caching effect. Using multiple
output files simply allows to run the write benchmark multiple times.

Author: wkliao

benchmarks/WRF-IO/wrf_io.c

@@ -26,7 +26,7 @@
  *    % mpicc -O2 wrf_io.c -o wrf_io -lpnetcdf
  *
  * An example of run command:
- *    % mpiexec -n 4 ./wrf_io -w -y 100 -x 100 -n 2 -i wrf_header.txt ./wrf_io.nc
+ *    % mpiexec -n 4 ./wrf_io -y 100 -x 100 -n 2 -i wrf_header.txt -w ./wrf_io.nc
  *
  *    -----------------------------------------------------------
  *    ---- WRF-IO write benchmark ----
@@ -939,9 +939,13 @@ int wrf_r_benchmark(char       *in_file,
     return err;
 }
 
+/*---- parse_str() >---------------------------------------------------------*/
+/* This subroutine parses an input string, in_str, into substring tokens,
+ * separated by comma, and returns the number of substrings.
+ */
 static
-int parse_str(char  *in_str,
-              int  **int_arr)
+int parse_str(char   *in_str,
+              char ***str_arr)
 {
     char *token, *str_dup;
     int nelems=0;
@@ -962,16 +966,16 @@ int parse_str(char  *in_str,
 
     free(str_dup);
 
-    /* allocate int_arr */
-    *int_arr = (int*) malloc(sizeof(int) * nelems);
+    /* allocate str_arr */
+    *str_arr = (char**) malloc(sizeof(char*) * nelems);
 
-    /* populate int_arr[] */
+    /* populate str_arr[] */
     str_dup = strdup(in_str);
     token = strtok(str_dup, ",");
-    (*int_arr)[0] = atoi(token);
+    (*str_arr)[0] = strdup(token);
     nelems = 1;
     while ((token = strtok(NULL, ",")) != NULL)
-        (*int_arr)[nelems++] = atoi(token);
+        (*str_arr)[nelems++] = strdup(token);
 
     free(str_dup);
     return nelems;
@@ -985,12 +989,11 @@ usage(char *argv0)
     "       [-h] print this help\n"
     "       [-q] quiet mode\n"
     "       [-d] debug mode\n"
-    "       [-r filename] benchmark read peformance\n"
-    "       [-w filename] benchmark write peformance\n"
+    "       [-r file1,file2,...] benchmark read  performance\n"
+    "       [-w file1,file2,...] benchmark write performance\n"
     "       [-y num] longitude of global 2D grid\n"
     "       [-x num] latitude of global 2D grid\n"
     "       [-n num] number of time steps\n"
-    "       [-c str] a list of cb_nodes separated by commas\n"
     "       [-i cdf_file] input text file containing CDL header\n";
     fprintf(stderr, help, argv0);
 }
@@ -999,11 +1002,9 @@ int main(int argc, char** argv)
 {
     extern int optind;
     extern char *optarg;
-    char out_file[1024], in_file[1024], int_str[24];
-    char *cdl_file, *cb_nodes_str;
-    int i, j, err, nerrs=0, nprocs, rank, ntimes, psizes[2], hid;
-    int num_cb_nodes, num_intra_nodes, *cb_nodes, do_read, do_write;
-    int nc_num_aggrs_per_node[]={0};
+    char *out_files, *in_files, *cdl_file, **fname;
+    int i, err, nerrs=0, nprocs, rank, ntimes, psizes[2], hid;
+    int nfiles, do_read, do_write;
     MPI_Offset longitude, latitude;
     MPI_Info info=MPI_INFO_NULL;
 
@@ -1012,16 +1013,16 @@ int main(int argc, char** argv)
     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
     MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
 
-    verbose  = 1;
-    debug    = 0;
-    do_read  = 0;
-    do_write = 0;
-    ntimes   = 1;
-    cdl_file = NULL;
+    verbose   = 1;
+    debug     = 0;
+    do_read   = 0;
+    do_write  = 0;
+    ntimes    = 1;
+    cdl_file  = NULL;
+    in_files  = NULL;
+    out_files = NULL;
     longitude = -1; /* default to use west_east from cdl file */
-    latitude = -1; /* default to use south_north from cdl file */
-    cb_nodes     = NULL;
-    cb_nodes_str = NULL;
+    latitude  = -1; /* default to use south_north from cdl file */
 
     while ((i = getopt(argc, argv, "hqdr:w:y:x:n:c:i:")) != EOF)
         switch(i) {
@@ -1030,17 +1031,15 @@ int main(int argc, char** argv)
             case 'd': debug = 1;
                       break;
             case 'r': do_read = 1;
-                      snprintf(in_file, 1024, "%s", optarg);
+                      in_files = strdup(optarg);
                       break;
             case 'w': do_write = 1;
-                      snprintf(out_file, 1024, "%s", optarg);
+                      out_files = strdup(optarg);
                       break;
             case 'y': longitude = atoll(optarg);
                       break;
             case 'x': latitude = atoll(optarg);
                       break;
-            case 'c': cb_nodes_str = strdup(optarg);
-                      break;
             case 'n': ntimes = atoi(optarg);
                       break;
             case 'i': cdl_file = strdup(optarg);
@@ -1063,104 +1062,71 @@ int main(int argc, char** argv)
 
     /* input CDL file is required for write benchmark */
     if (do_write && cdl_file == NULL) {
-        if (rank == 0) usage(argv[0]);
+        if (rank == 0) {
+            fprintf(stderr, "Error: write benchmark requires input CDL file\n");
+            usage(argv[0]);
+        }
         MPI_Finalize();
         return 1;
     }
 
-    /* parse CDL header file */
-    if (do_write) {
-        err = cdl_hdr_open(cdl_file, &hid);
-        free(cdl_file);
-        if (err != NC_NOERR) goto err_out;
-    }
-
     /* set up the 2D block-block data partitioning pattern */
     psizes[0] = psizes[1] = 0;
     MPI_Dims_create(nprocs, 2, psizes);
 
-    if (debug && do_write && rank == 0) {
-        printf("longitude=%lld latitude=%lld psizes=%d x %d\n",
-               longitude,latitude,psizes[0],psizes[1]);
-        fflush(stdout);
-    }
-
-    if (cb_nodes_str != NULL) {
-        num_cb_nodes = parse_str(cb_nodes_str, &cb_nodes);
-        free(cb_nodes_str);
-    }
-    else
-        num_cb_nodes = 1;
-
-    num_intra_nodes = sizeof(nc_num_aggrs_per_node) / sizeof(int);
-
-    /* set PnetCDF I/O hints */
-    MPI_Info_create(&info);
-
     if (do_write) {
-        for (i=0; i<num_cb_nodes; i++) {
-            /* set hint cb_nodes */
-            if (cb_nodes != NULL) {
-                sprintf(int_str, "%d", cb_nodes[i]);
-                MPI_Info_set(info, "cb_nodes", int_str);
-            }
+        /* parse CDL header file */
+        err = cdl_hdr_open(cdl_file, &hid);
+        free(cdl_file);
+        if (err != NC_NOERR) goto err_out;
 
-            for (j=0; j<num_intra_nodes; j++) {
-                snprintf(int_str, 24, "%d", nc_num_aggrs_per_node[j]);
-                MPI_Info_set(info, "nc_num_aggrs_per_node", int_str);
+        if (debug && rank == 0) {
+            printf("longitude=%lld latitude=%lld psizes=%d x %d\n",
+                longitude,latitude,psizes[0],psizes[1]);
+            fflush(stdout);
+        }
 
-                if (debug && rank == 0) {
-                    printf("Info cb_nodes set to %d nc_num_aggrs_per_node set to=%d\n",
-                           cb_nodes[i],nc_num_aggrs_per_node[j]);
-                    fflush(stdout);
-                }
+        /* Example of out_files: "0.nc,1.nc,2.nc", i.e. 3 output files */
+        nfiles = parse_str(out_files, &fname);
 
-                MPI_Barrier(MPI_COMM_WORLD);
+        for (i=0; i<nfiles; i++) {
+            MPI_Barrier(MPI_COMM_WORLD);
 
-                err = wrf_w_benchmark(out_file, hid, psizes, longitude, latitude,
-                                      ntimes, info);
+            err = wrf_w_benchmark(fname[i], hid, psizes, longitude, latitude,
+                                  ntimes, info);
 
-                if (err != NC_NOERR)
-                    printf("%d: Error at %s line=%d: i=%d j=%d error=%s\n",
-                           rank, argv[0], __LINE__, i, j, ncmpi_strerror(err));
-            }
+            if (err != NC_NOERR)
+                printf("%d: Error at %s line=%d: i=%d error=%s\n",
+                       rank, argv[0], __LINE__, i, ncmpi_strerror(err));
+
+            free(fname[i]);
         }
+        if (nfiles > 0) free(fname);
     }
 
     if (do_read) {
-        for (i=0; i<num_cb_nodes; i++) {
-            /* set hint cb_nodes */
-            if (cb_nodes != NULL) {
-                sprintf(int_str, "%d", cb_nodes[i]);
-                MPI_Info_set(info, "cb_nodes", int_str);
-            }
+        /* Example of in_files: "0.nc,1.nc,2.nc", i.e. 3 input files */
+        nfiles = parse_str(in_files, &fname);
 
-            for (j=0; j<num_intra_nodes; j++) {
-                snprintf(int_str, 24, "%d", nc_num_aggrs_per_node[j]);
-                MPI_Info_set(info, "nc_num_aggrs_per_node", int_str);
+        for (i=0; i<nfiles; i++) {
+            MPI_Barrier(MPI_COMM_WORLD);
 
-                if (debug && rank == 0) {
-                    printf("Info cb_nodes set to %d nc_num_aggrs_per_node set to=%d\n",
-                           cb_nodes[i],nc_num_aggrs_per_node[j]);
-                    fflush(stdout);
-                }
+            err = wrf_r_benchmark(fname[i], psizes, ntimes, info);
 
-                MPI_Barrier(MPI_COMM_WORLD);
+            if (err != NC_NOERR)
+                printf("%d: Error at %s line=%d: i=%d error=%s\n",
+                       rank, argv[0], __LINE__, i, ncmpi_strerror(err));
 
-                err = wrf_r_benchmark(in_file, psizes, ntimes, info);
-
-                if (err != NC_NOERR)
-                    printf("%d: Error at %s line=%d: i=%d j=%d error=%s\n",
-                           rank, argv[0], __LINE__, i, j, ncmpi_strerror(err));
-            }
+            free(fname[i]);
         }
+        if (nfiles > 0) free(fname);
     }
 
-    MPI_Info_free(&info);
-    if (cb_nodes != NULL) free(cb_nodes);
-
 err_out:
     cdl_hdr_close(hid);
+    if (out_files != NULL) free(out_files);
+    if (in_files  != NULL) free(in_files);
+    if (info != MPI_INFO_NULL) MPI_Info_free(&info);
 
     MPI_Finalize();
     return (nerrs > 0);