From 7902b97a3d5393ac1a5b8aff8402a56bd684b284 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Fri, 21 Oct 2022 23:09:44 +0300
Subject: [PATCH] =?UTF-8?q?mdbx-test:=20=D0=BF=D1=80=D0=BE=D1=81=D1=82?=
 =?UTF-8?q?=D0=B0=D1=8F=20=D0=BF=D1=80=D0=BE=D0=B2=D0=B5=D1=80=D0=BA=D0=B0?=
 =?UTF-8?q?=20warmup.?=
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---
 test/test.cc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/test/test.cc b/test/test.cc
index 6f620223..60fd6914 100644
--- a/test/test.cc
+++ b/test/test.cc
@@ -199,6 +199,19 @@ void testcase::txn_begin(bool readonly, MDBX_txn_flags_t flags) {
 
   log_trace("<< txn_begin(%s, 0x%04X)", readonly ? "read-only" : "read-write",
             flags);
+
+  if (flipcoin_n(5)) {
+    const unsigned mask =
+        unsigned(MDBX_warmup_default | MDBX_warmup_force | MDBX_warmup_oomsafe |
+                 MDBX_warmup_lock | MDBX_warmup_touchlimit);
+    static unsigned counter;
+    MDBX_warmup_flags_t warmup_flags = MDBX_warmup_flags_t(
+        (counter > MDBX_warmup_release) ? prng64() & mask : counter);
+    counter += 1;
+    int err = mdbx_env_warmup(db_guard.get(), txn, warmup_flags, 0);
+    log_trace("== counter %u, env_warmup(flags %u), rc %d", counter,
+              warmup_flags, err);
+  }
 }
 
 int testcase::breakable_commit() {