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9e622b5add
trace_log/query_log from performance tests shows (for cases when prewarm query fails with timeout, 15sec) excessive writeTraceInfo() in trace_log and QueryProfilerRuns in query_log, but this is not the root cause of the timeout, but consequence. Also query_log shows that on failures the following profile events has significantly higher values: - PerfLocalMemoryMisses (6.3x more) - PerfLocalMemoryReferences (7x more) - PerfDataTLBMisses (6.9x more) - PerfInstructionTLBMisses (6.4x more) During looking at performance tests logs I noticed that once the prewarm query fails other server (left/right) was merging (MergeTree) something in *_log tables. But, using MergeTree for *_log in performance tests is useless, since anyway environment for performance tests uses ramdrive. And so MergeTree merges just increase overhead. Eventually I expect that this should decrease extra memory referencing and so this should decrease cache/TLB misses. CI: https://clickhouse-test-reports.s3.yandex.net/30886/c504e0c08df7a926bb479a1d297f326f5c48a32f/performance_comparison/report.html#fail1 v2: <partition_by remove="remove"/>
53 lines
1.6 KiB
XML
53 lines
1.6 KiB
XML
<clickhouse>
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<http_port remove="remove"/>
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<mysql_port remove="remove"/>
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<postgresql_port remove="remove"/>
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<interserver_http_port remove="remove"/>
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<tcp_with_proxy_port remove="remove"/>
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<keeper_server remove="remove"/>
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<zookeeper remove="remove"/>
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<listen_host>::</listen_host>
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<logger>
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<console>true</console>
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</logger>
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<text_log remove="remove"/>
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<crash_log remove="remove"/>
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<query_views_log remove="remove"/>
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<part_log remove="remove"/>
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<opentelemetry_span_log remove="remove"/>
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<session_log remove="remove"/>
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<!-- performance tests does not uses real block devices,
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instead they stores everything in memory.
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And so, to avoid extra memory reference switch *_log to Memory engine. -->
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<query_log>
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<engine>ENGINE = Memory</engine>
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<partition_by remove="remove"/>
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</query_log>
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<query_thread_log>
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<engine>ENGINE = Memory</engine>
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<partition_by remove="remove"/>
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</query_thread_log>
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<trace_log>
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<engine>ENGINE = Memory</engine>
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<partition_by remove="remove"/>
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</trace_log>
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<metric_log>
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<engine>ENGINE = Memory</engine>
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<partition_by remove="remove"/>
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</metric_log>
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<asynchronous_metric_log>
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<engine>ENGINE = Memory</engine>
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<partition_by remove="remove"/>
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</asynchronous_metric_log>
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<uncompressed_cache_size>1000000000</uncompressed_cache_size>
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<asynchronous_metrics_update_period_s>10</asynchronous_metrics_update_period_s>
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<remap_executable replace="replace">true</remap_executable>
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</clickhouse>
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