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Merge pull request #23259 from azat/jemalloc-background_thread

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Report an error if jemalloc.background_thread was requested
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alexey-milovidov 2021-04-19 22:37:16 +03:00 committed by GitHub
commit f69f11e6cd
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2 changed files with 29 additions and 0 deletions
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1
programs/server/CMakeLists.txt
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@ -19,6 +19,7 @@ set (CLICKHOUSE_SERVER_LINK
clickhouse_storages_system
clickhouse_table_functions
string_utils
jemalloc
${LINK_RESOURCE_LIB}

28
programs/server/Server.cpp
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@ -101,6 +101,10 @@
# include <Server/KeeperTCPHandlerFactory.h>
#endif
#if USE_JEMALLOC
# include <jemalloc/jemalloc.h>
#endif
namespace CurrentMetrics
{
extern const Metric Revision;
@ -109,11 +113,35 @@ namespace CurrentMetrics
extern const Metric MaxDDLEntryID;
}
#if USE_JEMALLOC
static bool jemallocOptionEnabled(const char *name)
{
bool value;
size_t size = sizeof(value);
if (mallctl(name, reinterpret_cast<void *>(&value), &size, /* newp= */ nullptr, /* newlen= */ 0))
throw Poco::SystemException("mallctl() failed");
return value;
}
#else
static bool jemallocOptionEnabled(const char *) { return 0; }
#endif
int mainEntryClickHouseServer(int argc, char ** argv)
{
DB::Server app;
if (jemallocOptionEnabled("opt.background_thread"))
{
LOG_ERROR(&app.logger(),
"jemalloc.background_thread was requested, "
"however ClickHouse uses percpu_arena and background_thread most likely will not give any benefits, "
"and also background_thread is not compatible with ClickHouse watchdog "
"(that can be disabled with CLICKHOUSE_WATCHDOG_ENABLE=0)");
}
/// Do not fork separate process from watchdog if we attached to terminal.
/// Otherwise it breaks gdb usage.
/// Can be overridden by environment variable (cannot use server config at this moment).