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@ -41,6 +41,9 @@ T getJemallocValue(const char * name)
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return value;
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return value;
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}
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}
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/// Each mallctl call consists of string name lookup which can be expensive.
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/// This can be avoided by translating name to "Management Information Base" (MIB)
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/// and using it in mallctlbymib calls
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template <typename T>
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template <typename T>
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struct JemallocMibCache
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struct JemallocMibCache
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{
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{
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@ -8,6 +8,12 @@ namespace DB
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{
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{
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#if USE_JEMALLOC
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#if USE_JEMALLOC
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/// Correct MemoryTracker based on stats.resident read from jemalloc.
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/// This requires jemalloc built with --enable-stats which we use.
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/// The worker spawns a background thread which moves the jemalloc epoch (updates internal stats),
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/// and fetches the current stats.resident whose value is sent to global MemoryTracker.
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/// Additionally, if the current memory usage is higher than global hard limit,
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/// jemalloc's dirty pages are forcefully purged.
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class MemoryWorker
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class MemoryWorker
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{
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{
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public:
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public:
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