More realistic test sizes in test_ORExpand_parallel

Enclave/OblivAlgs/ORExpand.cpp

@@ -45,8 +45,8 @@ void test_ORExpand()
 
 void test_ORExpand_parallel(threadid_t nthreads)
 {
-    size_t block_size = 48;
-    uint32_t N = 1000000;
+    size_t block_size = 384;
+    uint32_t N = 500000;
 
     unsigned char *buf = new unsigned char[N*block_size];
     uint32_t *dest = new uint32_t[N];