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Implement suggestion from Sergey Veletsky

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This commit is contained in:
Alexey Milovidov 2020-04-22 01:40:18 +03:00
parent 561702c264
commit 0482e2e3ea
3 changed files with 18 additions and 2 deletions
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2
programs/server/Server.cpp
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@ -562,7 +562,7 @@ int Server::main(const std::vector<std::string> & /*args*/)
format_schema_path.createDirectories();
/// Limit on total memory usage
size_t max_server_memory_usage = settings.max_server_memory_usage;
size_t max_server_memory_usage = config().getUInt64("max_server_memory_usage", 0);
double max_server_memory_usage_to_ram_ratio = config().getDouble("max_server_memory_usage_to_ram_ratio", 0.9);
size_t default_max_server_memory_usage = memory_amount * max_server_memory_usage_to_ram_ratio;

17
programs/server/config.xml
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@ -90,6 +90,23 @@
<!-- Maximum number of concurrent queries. -->
<max_concurrent_queries>100</max_concurrent_queries>
<!-- Maximum memory usage (resident set size) for server process.
Zero value or unset means default. Default is "max_server_memory_usage_to_ram_ratio" of available physical RAM.
If the value is larger than "max_server_memory_usage_to_ram_ratio" of available physical RAM, it will be cut down.
The constraint is checked on query execution time.
If a query tries to allocate memory and the current memory usage plus allocation is greater
than specified threshold, exception will be thrown.
It is not practical to set this constraint to small values like just a few gigabytes,
because memory allocator will keep this amount of memory in caches and the server will deny service of queries.
-->
<max_server_memory_usage>0</max_server_memory_usage>
<!-- On memory constrained environments you may have to set this to value larger than 1.
-->
<max_server_memory_usage_to_ram_ratio>0.9</max_server_memory_usage_to_ram_ratio>
<!-- Set limit on number of open files (default: maximum). This setting makes sense on Mac OS X because getrlimit() fails to retrieve
correct maximum value. -->
<!-- <max_open_files>262144</max_open_files> -->

1
src/Core/Settings.h
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@ -339,7 +339,6 @@ struct Settings : public SettingsCollection<Settings>
\
M(SettingUInt64, max_memory_usage, 0, "Maximum memory usage for processing of single query. Zero means unlimited.", 0) \
M(SettingUInt64, max_memory_usage_for_user, 0, "Maximum memory usage for processing all concurrently running queries for the user. Zero means unlimited.", 0) \
M(SettingUInt64, max_server_memory_usage, 0, "Maximum memory usage for server. Only has meaning at server startup. It can be specified only for default profile.", 0) \
M(SettingUInt64, memory_profiler_step, 0, "Every number of bytes the memory profiler will collect the allocating stack trace. The minimal effective step is 4 MiB (less values will work as clamped to 4 MiB). Zero means disabled memory profiler.", 0) \
\
M(SettingUInt64, max_network_bandwidth, 0, "The maximum speed of data exchange over the network in bytes per second for a query. Zero means unlimited.", 0) \