From: Sun Yuechi <sunyuechi@iscas.ac.cn>
Date: Sat, 13 Jun 2026 11:24:50 +0000 (+0800)
Subject: crimson/test: shrink messenger-thrash max_message_len to 1MB
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=feffdffb8ef265e3416f2f6e4f0630d4fa5b33bd;p=ceph.git

crimson/test: shrink messenger-thrash max_message_len to 1MB

The test keeps random_num payload buffers (each up to max_message_len)
resident and sends copies concurrently; at 4MB the peak working set
runs ~600MB and overflows the test's 256M --memory arena with bad_alloc.

--memory only binds when seastar's own allocator is compiled in
(RelWithDebInfo/Release); Debug/Sanitize define
SEASTAR_DEFAULT_ALLOCATOR and use the heap, so the limit never bites
there.

Shrink max_message_len to 1MB, cutting the peak below 160MB so it fits
the 256M arena instead of enlarging it.

Signed-off-by: Sun Yuechi <sunyuechi@iscas.ac.cn>
---

diff --git a/src/test/crimson/test_messenger_thrash.cc b/src/test/crimson/test_messenger_thrash.cc
index ebc4a383ab2..1274db22cdc 100644
--- a/src/test/crimson/test_messenger_thrash.cc
+++ b/src/test/crimson/test_messenger_thrash.cc
@@ -244,7 +244,7 @@ class SyntheticWorkload {
    const unsigned min_connections = 10;
    const unsigned max_in_flight = 64;
    const unsigned max_connections = 128;
-   const unsigned max_message_len = 1024 * 1024 * 4;
+   const unsigned max_message_len = 1024 * 1024;
    const uint64_t  servers, clients;
 
    SyntheticWorkload(int servers, int clients, int random_num,