diff --git a/test/watch_psil_allocs.lua b/test/watch_psil_allocs.lua
new file mode 100644
index 0000000..a45685e
--- /dev/null
+++ b/test/watch_psil_allocs.lua
@@ -0,0 +1,56 @@
+-- add this to psil:
+
+--[[
+    -- count the number of subscribers in this PSIL instance
+    ---@return integer count
+    function public.count()
+        local c = 0
+        for _, val in pairs(ic) do
+            for _ = 1, #val.subscribers do c = c + 1 end
+        end
+        return c
+    end
+]]--
+
+
+-- add this to coordinator iocontrol front panel heartbeat function:
+
+--[[
+if io.facility then
+    local count = io.facility.ps.count()
+
+    count = count + io.facility.env_d_ps.count()
+
+    for x = 1, #io.facility.induction_ps_tbl do
+        count = count + io.facility.induction_ps_tbl[x].count()
+    end
+
+    for x = 1, #io.facility.sps_ps_tbl do
+        count = count + io.facility.sps_ps_tbl[x].count()
+    end
+
+    for x = 1, #io.facility.tank_ps_tbl do
+        count = count + io.facility.tank_ps_tbl[x].count()
+    end
+
+    for i = 1, #io.units do
+        local entry = io.units[i] ---@type ioctl_unit
+
+        count = count + entry.unit_ps.count()
+
+        for x = 1, #entry.boiler_ps_tbl do
+            count = count + entry.boiler_ps_tbl[x].count()
+        end
+
+        for x = 1, #entry.turbine_ps_tbl do
+            count = count + entry.turbine_ps_tbl[x].count()
+        end
+
+        for x = 1, #entry.tank_ps_tbl do
+            count = count + entry.tank_ps_tbl[x].count()
+        end
+    end
+
+    log.debug(count)
+end
+]]--