test: decrease the test system in HSolver_dav

Author: pxlxingliang

source/module_hsolver/test/diago_david_test.cpp

@@ -161,8 +161,8 @@ TEST_P(DiagoDavTest,RandomHamilt)
 INSTANTIATE_TEST_SUITE_P(VerifyDiag,DiagoDavTest,::testing::Values(
 		//DiagoDavPrepare(int nband, int npw, int sparsity, int order,double eps,int maxiter)
         DiagoDavPrepare(10,100,0,4,1e-5,500),
-        DiagoDavPrepare(20,500,7,4,1e-5,500),
-        DiagoDavPrepare(50,1000,8,4,1e-5,500)
+        DiagoDavPrepare(20,500,7,4,1e-5,500)
+        //DiagoDavPrepare(50,1000,8,4,1e-5,500)
 		//DiagoDavPrepare(20,2000,8,4,1e-5,500)
 ));
 
@@ -174,7 +174,7 @@ TEST(DiagoDavRealSystemTest,dataH)
 	ifs.close();
 	DIAGOTEST::hmatrix = hmatrix;
 	DIAGOTEST::npw = hmatrix.nc;
-	int nband = max(hmatrix.nc/4,1);
+	int nband = max(hmatrix.nc/20,1);
 
 	DiagoDavPrepare ddp(nband,DIAGOTEST::npw,0,2,1e-5,500);