From 702d7e620ff8ce8c2b49700f8c784a2dac66e556 Mon Sep 17 00:00:00 2001
From: Mayeul Cantan <oss+nheko@mayeul.net>
Date: Tue, 19 Jul 2022 13:42:28 +0200
Subject: [PATCH] Better handle 32-bit platforms by limitting database size
Experimentally, setting the database size to 2GB didn't work.
These values are quite arbitrary, and should probably be settings or
automatically adjusted.
---
src/Cache.cpp | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/src/Cache.cpp b/src/Cache.cpp
index 79a5ea048..9782ee995 100644
--- a/src/Cache.cpp
+++ b/src/Cache.cpp
@@ -46,10 +46,16 @@ static const std::string_view OLM_ACCOUNT_KEY("olm_account");
static const std::string_view CACHE_FORMAT_VERSION_KEY("cache_format_version");
static const std::string_view CURRENT_ONLINE_BACKUP_VERSION("current_online_backup_version");
+constexpr auto MAX_DBS = 32384UL;
+#if Q_PROCESSOR_WORDSIZE == 8 // 64-bit
+constexpr auto DB_SIZE = 32ULL * 1024ULL * 1024ULL * 1024ULL; // 32 GB
constexpr size_t MAX_RESTORED_MESSAGES = 30'000;
-
-constexpr auto DB_SIZE = 32ULL * 1024ULL * 1024ULL * 1024ULL; // 32 GB
-constexpr auto MAX_DBS = 32384UL;
+#elif Q_PROCESSOR_WORDSIZE == 4 // 32-bit address space limits mmaps
+constexpr auto DB_SIZE = 1ULL * 1024ULL * 1024ULL * 1024ULL; // 1 GB
+constexpr size_t MAX_RESTORED_MESSAGES = 5'000;
+#else
+#error unknown word size on target CPU
+#endif
constexpr auto BATCH_SIZE = 100;
//! Cache databases and their format.
--
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