diff --git a/resource/modules/Makefile.am b/resource/modules/Makefile.am
index 9b1368beb..dc2272ac6 100644
--- a/resource/modules/Makefile.am
+++ b/resource/modules/Makefile.am
@@ -24,6 +24,7 @@ sched_fluxion_resource_la_CXXFLAGS = \
     $(FLUX_CORE_CFLAGS)
 sched_fluxion_resource_la_LIBADD = \
     ../libresource.la \
+    $(FLUX_IDSET_LIBS) \
     $(FLUX_CORE_LIBS) \
     $(DL_LIBS) \
     $(HWLOC_LIBS) \
diff --git a/resource/modules/resource_match.cpp b/resource/modules/resource_match.cpp
index 89e3850b9..2671eae10 100644
--- a/resource/modules/resource_match.cpp
+++ b/resource/modules/resource_match.cpp
@@ -33,6 +33,7 @@ extern "C" {
 #include "config.h"
 #endif
 #include <flux/core.h>
+#include <flux/idset.h>
 #include <jansson.h>
 #include "src/common/libutil/shortjansson.h"
 }
@@ -91,6 +92,7 @@ resource_ctx_t::~resource_ctx_t ()
     flux_msg_handler_delvec (handlers);
 }
 
+
 /******************************************************************************
  *                                                                            *
  *                          Request Handler Prototypes                        *
@@ -1114,10 +1116,60 @@ static void info_request_cb (flux_t *h, flux_msg_handler_t *w,
         flux_log_error (h, "%s: flux_respond_error", __FUNCTION__);
 }
 
+static int get_stat_by_rank (std::shared_ptr<resource_ctx_t>& ctx, json_t *o)
+{
+    int rc = -1;
+    int saved_errno = 0;
+    char *str = nullptr;
+    struct idset *ids = nullptr;
+    std::map<size_t, struct idset *> s2r;
+
+    for (auto &kv : ctx->db->metadata.by_rank) {
+        if (kv.first == -1)
+            continue;
+        if (s2r.find (kv.second.size ()) == s2r.end ()) {
+            if ( !(ids = idset_create (0, IDSET_FLAG_AUTOGROW)))
+                goto done;
+            s2r[kv.second.size ()] = ids;
+        }
+        if ( (rc = idset_set (s2r[kv.second.size ()],
+                              static_cast<unsigned int> (kv.first))) < 0)
+            goto done;
+    }
+
+    for (auto &kv : s2r) {
+        if ( !(str = idset_encode (kv.second,
+                                   IDSET_FLAG_BRACKETS | IDSET_FLAG_RANGE))) {
+            rc = -1;
+            goto done;
+        }
+        if ( (rc = json_object_set_new (o, str,
+                      json_integer (static_cast<json_int_t> (kv.first)))) < 0) {
+            errno = ENOMEM;
+            goto done;
+        }
+        saved_errno = errno;
+        free (str);
+        errno = saved_errno;
+        str = nullptr;
+    }
+
+done:
+    for (auto &kv : s2r)
+        idset_destroy (kv.second);
+    saved_errno = errno;
+    s2r.clear ();
+    free (str);
+    errno = saved_errno;
+    return rc;
+}
+
 static void stat_request_cb (flux_t *h, flux_msg_handler_t *w,
                              const flux_msg_t *msg, void *arg)
 {
     std::shared_ptr<resource_ctx_t> ctx = getctx ((flux_t *)arg);
+    int saved_errno;
+    json_t *o = nullptr;
     double avg = 0.0f;
     double min = 0.0f;
 
@@ -1125,15 +1177,35 @@ static void stat_request_cb (flux_t *h, flux_msg_handler_t *w,
         avg = ctx->perf.accum / (double)ctx->perf.njobs;
         min = ctx->perf.min;
     }
-    if (flux_respond_pack (h, msg, "{s:I s:I s:f s:I s:f s:f s:f}",
+    if ( !(o = json_object ())) {
+        errno = ENOMEM;
+        goto error;
+    }
+    if (get_stat_by_rank (ctx, o) < 0) {
+        flux_log_error (h, "%s: get_stat_by_rank", __FUNCTION__);
+        goto error_free;
+    }
+    if (flux_respond_pack (h, msg, "{s:I s:I s:o s:f s:I s:f s:f s:f}",
                                    "V", num_vertices (ctx->db->resource_graph),
                                    "E", num_edges (ctx->db->resource_graph),
+                                   "by_rank", o,
                                    "load-time", ctx->perf.load,
                                    "njobs", ctx->perf.njobs,
                                    "min-match", min,
                                    "max-match", ctx->perf.max,
-                                   "avg-match", avg) < 0)
-        flux_log_error (h, "%s", __FUNCTION__);
+                                   "avg-match", avg) < 0) {
+        flux_log_error (h, "%s: flux_respond_pack", __FUNCTION__);
+    }
+
+    return;
+
+error_free:
+    saved_errno = errno;
+    json_decref (o);
+    errno = saved_errno;
+error:
+    if (flux_respond_error (h, msg, errno, NULL) < 0)
+        flux_log_error (h, "%s: flux_respond_error", __FUNCTION__);
 }
 
 static inline int64_t next_jobid (const std::map<uint64_t,
diff --git a/resource/readers/resource_reader_grug.cpp b/resource/readers/resource_reader_grug.cpp
index 62923c191..af62c88a1 100644
--- a/resource/readers/resource_reader_grug.cpp
+++ b/resource/readers/resource_reader_grug.cpp
@@ -228,6 +228,7 @@ vtx_t dfs_emitter_t::emit_vertex (ggv_t u, gge_t e, const gg_t &recipe,
     m.by_path[g[v].paths[ssys]] = v;
     m.by_type[g[v].type].push_back (v);
     m.by_name[g[v].name].push_back (v);
+    m.by_rank[m_rank].push_back (v);
     return v;
 }
 
diff --git a/resource/readers/resource_reader_hwloc.cpp b/resource/readers/resource_reader_hwloc.cpp
index 744fd8639..f5340ae83 100644
--- a/resource/readers/resource_reader_hwloc.cpp
+++ b/resource/readers/resource_reader_hwloc.cpp
@@ -107,6 +107,7 @@ vtx_t resource_reader_hwloc_t::add_new_vertex (resource_graph_t &g,
     m.by_path[g[v].paths[subsys]] = v;
     m.by_type[g[v].type].push_back (v);
     m.by_name[g[v].name].push_back (v);
+    m.by_rank[rank].push_back (v);
     return v;
 }
 
diff --git a/resource/readers/resource_reader_jgf.cpp b/resource/readers/resource_reader_jgf.cpp
index ee6ecd961..fa871db74 100644
--- a/resource/readers/resource_reader_jgf.cpp
+++ b/resource/readers/resource_reader_jgf.cpp
@@ -298,6 +298,7 @@ int resource_reader_jgf_t::add_graph_metadata (vtx_t v,
     }
     m.by_type[g[v].type].push_back (v);
     m.by_name[g[v].name].push_back (v);
+    m.by_rank[g[v].rank].push_back (v);
     rc = 0;
 
 done:
diff --git a/resource/store/resource_graph_store.hpp b/resource/store/resource_graph_store.hpp
index 04bd43c0d..5dd378b5c 100644
--- a/resource/store/resource_graph_store.hpp
+++ b/resource/store/resource_graph_store.hpp
@@ -42,6 +42,7 @@ struct resource_graph_metadata_t {
     std::map<subsystem_t, relation_infra_t> v_rt_edges;
     std::map<std::string, std::vector <vtx_t>> by_type;
     std::map<std::string, std::vector <vtx_t>> by_name;
+    std::map<int64_t, std::vector <vtx_t>> by_rank;
     std::map<std::string, vtx_t> by_path;
 };
 
diff --git a/resource/utilities/resource-query.cpp b/resource/utilities/resource-query.cpp
index 17a925b01..4ee20b19e 100644
--- a/resource/utilities/resource-query.cpp
+++ b/resource/utilities/resource-query.cpp
@@ -500,6 +500,11 @@ static int populate_resource_db (std::shared_ptr<resource_context_t> &ctx)
                      ctx->db->metadata.by_name.size () << std::endl;
         std::cout << "INFO: by_path Key-Value Pairs: " <<
                      ctx->db->metadata.by_path.size () << std::endl;
+        for (auto it = ctx->db->metadata.by_rank.begin (); 
+                     it != ctx->db->metadata.by_rank.end (); ++it) {
+            std::cout << "INFO: number of vertices with rank " 
+                        << it->first << ": " << it->second.size () << "\n";
+        }
     }
 
 done:
diff --git a/t/Makefile.am b/t/Makefile.am
index 116f11f65..74d41626a 100644
--- a/t/Makefile.am
+++ b/t/Makefile.am
@@ -69,7 +69,8 @@ TESTS = \
     t4009-match-update.t \
     t5000-valgrind.t \
     t6000-graph-size.t \
-    t6001-match-formats.t
+    t6001-match-formats.t \
+    t6002-graph-hwloc.t
 
 check_SCRIPTS = $(TESTS)
 
diff --git a/t/scripts/flux-ion-resource.py b/t/scripts/flux-ion-resource.py
index 4dbd1a6b9..0e46e444d 100755
--- a/t/scripts/flux-ion-resource.py
+++ b/t/scripts/flux-ion-resource.py
@@ -156,6 +156,7 @@ def stat_action (args):
     resp = r.rpc_stat ()
     print ("Num. of Vertices: ", resp['V'])
     print ("Num. of Edges: ", resp['E'])
+    print ("Num. of Vertices by Rank: ", json.dumps (resp['by_rank']))
     print ("Graph Load Time: ", resp['load-time'], "Secs")
     print ("Num. of Jobs Matched: ", resp['njobs'])
     print ("Min. Match Time: ", resp['min-match'], "Secs")
diff --git a/t/t6000-graph-size.t b/t/t6000-graph-size.t
index b3f4f26d7..46e6f4348 100755
--- a/t/t6000-graph-size.t
+++ b/t/t6000-graph-size.t
@@ -20,8 +20,10 @@ test_expect_success "vertex/edge counts for a tiny machine are correct" '
     test ${edg} -eq 198
 '
 
-test_expect_success "by_type, by_name, and by_path map sizes are correct \
-for GRUG" '
+# Note that by default the rank is -1, meaning that the by_rank map 
+# contains the same number of vertices as the overall resource graph. 
+test_expect_success "by_type, by_name, by_path, and by_rank map sizes are \
+correct for GRUG" '
     echo "quit" > input2.txt &&
     ${query} -L ${tiny_grug} -e -S CA -P high < input2.txt > out2.txt &&
     by_type=$(grep "by_type" out2.txt | sed "s/INFO: by_type Key-Value \
@@ -30,13 +32,21 @@ Pairs: //") &&
 Pairs: //") &&
     by_path=$(grep "by_path" out2.txt | sed "s/INFO: by_path Key-Value \
 Pairs: //") &&
+    by_rank=$(grep "number of" out2.txt | sed "s/INFO: number of \
+vertices with rank //") &&
+    rank=$( echo ${by_rank} | sed "s/:.*//" ) &&
+    nvertices=$( echo ${by_rank} | sed "s/[^:]*://" ) &&
     test ${by_type} -eq 7 &&
     test ${by_name} -eq 52 &&
-    test ${by_path} -eq 100
+    test ${by_path} -eq 100 &&
+    test ${rank} -eq -1 &&
+    test ${nvertices} -eq 100
 '
 
-test_expect_success "by_type, by_name, and by_path map sizes are correct \
-for JGF" '
+# Note that by default the rank is -1, meaning that the by_rank map 
+# contains the same number of vertices as the overall resource graph. 
+test_expect_success "by_type, by_name, by_path, and by_rank map sizes are \
+correct for JGF." '
     echo "quit" > input3.txt &&
     ${query} -L ${tiny_jgf} -e -S CA -P high -f jgf < input3.txt > \
 out3.txt &&
@@ -46,13 +56,21 @@ Pairs: //") &&
 Pairs: //") &&
     by_path=$(grep "by_path" out3.txt | sed "s/INFO: by_path Key-Value \
 Pairs: //") &&
+    by_rank=$(grep "number of" out3.txt | sed "s/INFO: number of \
+vertices with rank //") &&
+    rank=$( echo ${by_rank} | sed "s/:.*//" ) &&
+    nvertices=$( echo ${by_rank} | sed "s/[^:]*://" ) &&
     test ${by_type} -eq 7 &&
     test ${by_name} -eq 52 &&
-    test ${by_path} -eq 100 
+    test ${by_path} -eq 100 &&
+    test ${rank} -eq -1 &&
+    test ${nvertices} -eq 100
 '
 
-test_expect_success "by_type, by_name, and by_path map sizes are correct \
-for hwloc" '
+# Note that by default the rank is -1, meaning that the by_rank map 
+# contains the same number of vertices as the overall resource graph. 
+test_expect_success "by_type, by_name, by_path, and by_rank map sizes are \
+correct for hwloc" '
     echo "quit" > input4.txt &&
     ${query} -L ${exclusive_001N_hwloc} -e -S CA -P high -f hwloc < \
 input4.txt > out4.txt &&
@@ -62,9 +80,15 @@ Pairs: //") &&
 Pairs: //") &&
     by_path=$(grep "by_path" out4.txt | sed "s/INFO: by_path Key-Value \
 Pairs: //") &&
+    by_rank=$(grep "number of" out4.txt | sed "s/INFO: number of \
+vertices with rank //") &&
+    rank=$( echo ${by_rank} | sed "s/:.*//" ) &&
+    nvertices=$( echo ${by_rank} | sed "s/[^:]*://" ) &&
     test ${by_type} -eq 7 &&
     test ${by_name} -eq 21 &&
-    test ${by_path} -eq 21
+    test ${by_path} -eq 21 &&
+    test ${rank} -eq -1 &&
+    test ${nvertices} -eq 21
 '
 
 test_expect_success "--reserve-vtx-vec works" '
diff --git a/t/t6002-graph-hwloc.t b/t/t6002-graph-hwloc.t
new file mode 100755
index 000000000..b0bce2ce7
--- /dev/null
+++ b/t/t6002-graph-hwloc.t
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+test_description='Test Graph Data Store under the Fluxion Resource Module'
+
+. `dirname $0`/sharness.sh
+
+hwloc_basepath=`readlink -e ${SHARNESS_TEST_SRCDIR}/data/hwloc-data`
+# 4 brokers, each (exclusively) have: 1 node, 2 sockets, 16 cores (8 per socket)
+excl_4N4B="${hwloc_basepath}/004N/exclusive/04-brokers"
+
+verify() {
+    local of=$1
+    echo "{\"[0-3]\": 37}" | jq ' ' > ref.out
+    cat ${of} | grep Rank: | awk '{ print $6 $7}' | jq ' ' > cmp.out
+    diff cmp.out ref.out
+    return $?
+}
+
+skip_all_unless_have jq
+
+test_under_flux 4
+
+test_expect_success 'qmanager: hwloc reload works' '
+    flux hwloc reload ${excl_4N4B}
+'
+
+test_expect_success 'qmanager: loading resource and qmanager modules works' '
+    flux module remove sched-simple &&
+    load_resource prune-filters=ALL:core subsystems=containment policy=low
+'
+
+test_expect_success 'qmanager: graph stat as expected' '
+    flux ion-resource stat > stat.out &&
+    verify stat.out
+'
+
+test_expect_success 'removing resource and qmanager modules' '
+    remove_resource
+'
+
+test_done