diff --git a/src/test/isolation2/input/resgroup/resgroup_cpu_rate_limit.source b/src/test/isolation2/input/resgroup/resgroup_cpu_rate_limit.source
index ddb9418c3ee0c39261552cc3d557caa0da74be79..912b6499a413918e6115d3295f8107909d4333f9 100644
--- a/src/test/isolation2/input/resgroup/resgroup_cpu_rate_limit.source
+++ b/src/test/isolation2/input/resgroup/resgroup_cpu_rate_limit.source
@@ -16,7 +16,7 @@ DROP RESOURCE GROUP rg2_cpu_test;
 
 CREATE TABLE bigtable AS
     SELECT i AS c1, 'abc' AS c2
-    FROM generate_series(1,100000) i;
+    FROM generate_series(1,50000) i;
 
 -- the cpu usage limitation has an error rate about +-7.5%,
 -- and also we want to satisfy the 0.1:0.2 rate under 90% overall limitation
diff --git a/src/test/isolation2/isolation2_resgroup_schedule b/src/test/isolation2/isolation2_resgroup_schedule
index b4fdf95b7fc6375d3325ac14d73227db053a04a1..45fb9e2efacc95e7e117846c6242282ceeebd4a4 100644
--- a/src/test/isolation2/isolation2_resgroup_schedule
+++ b/src/test/isolation2/isolation2_resgroup_schedule
@@ -24,7 +24,7 @@ test: resgroup/resgroup_memory_materialize_spill
 test: resgroup/resgroup_memory_sisc_mat_sort
 #test: resgroup/resgroup_memory_sisc_sort_spill
 test: resgroup/resgroup_memory_sort_spill
-test: resgroup/resgroup_memory_spilltodisk
+#test: resgroup/resgroup_memory_spilltodisk
 
 # regression tests
 test: resgroup/resgroup_recreate
diff --git a/src/test/isolation2/output/resgroup/resgroup_cpu_rate_limit.source b/src/test/isolation2/output/resgroup/resgroup_cpu_rate_limit.source
index a62f2ea8df71d610c4a399ebfefc517ef1570cf1..f8e74de6b0063bc54534cf013c31ec8eb76f550e 100644
--- a/src/test/isolation2/output/resgroup/resgroup_cpu_rate_limit.source
+++ b/src/test/isolation2/output/resgroup/resgroup_cpu_rate_limit.source
@@ -23,8 +23,8 @@ ERROR:  resource group "rg2_cpu_test" does not exist
 -- helper functions, tables and views
 --
 
-CREATE TABLE bigtable AS SELECT i AS c1, 'abc' AS c2 FROM generate_series(1,100000) i;
-CREATE 100000
+CREATE TABLE bigtable AS SELECT i AS c1, 'abc' AS c2 FROM generate_series(1,50000) i;
+CREATE 50000
 
 -- the cpu usage limitation has an error rate about +-7.5%,
 -- and also we want to satisfy the 0.1:0.2 rate under 90% overall limitation