From 22ae3f63a3ea07335c8225a7d342929e9a06cacb Mon Sep 17 00:00:00 2001
From: Jiaming Yuan <jm.yuan@outlook.com>
Date: Thu, 15 Jun 2023 00:54:05 +0800
Subject: [PATCH] reduce page number.

---
 src/data/sparse_page_source.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/data/sparse_page_source.h b/src/data/sparse_page_source.h
index 0060f2d4f176..ddadbeeecc58 100644
--- a/src/data/sparse_page_source.h
+++ b/src/data/sparse_page_source.h
@@ -116,7 +116,7 @@ class SparsePageSourceImpl : public BatchIteratorImpl<S> {
     }
     // An heuristic for number of pre-fetched batches.  We can make it part of BatchParam
     // to let user adjust number of pre-fetched batches when needed.
-    uint32_t constexpr kPreFetch = 4;
+    uint32_t constexpr kPreFetch = 3;
 
     size_t n_prefetch_batches = std::min(kPreFetch, n_batches_);
     CHECK_GT(n_prefetch_batches, 0) << "total batches:" << n_batches_;