(EN) GpuScan + SSD-to-GPU Direct DMA - KaiGaiの俺メモ
An article for none-Japanese readers.... What I'm recently working on is a feature to load data blocks from NVMe-SSD to GPU using peer-to-peer DMA. It allows to bypass the CPU/RAM under a series of data loading process, thus, also allows to reduce number of expensive data copy. Once data blocks are loaded onto the GPU's RAM, we can process individual records within the blocks, by thousands process
[postgres]大容量メモリかつOSがRHEL(CentOS)6系をお使いの方、THPのdefragは止めた方が良いですよ - Qiita
■ 現行設定確認 # cat /sys/kernel/mm/transparent_hugepage/defrag ⇒alwayであれば対象 ■ あれ？sys高いなと思ったときに打つ # perf top ⇒以下のように出たらすぐにTHPのdefrag設定を見直しましょう ～～～ Samples: 2M of event 'cycles', Event count (approx.): 908733026153 42.59% [kernel] [k] compaction_alloc ←★これ (圧縮_再配置) 8.09% [kernel] [k] __reset_isolation_suitable 2.32% [kernel] [k] compact_zone ... ～～～ 起きたこと CPU使用率のsysが張り付く postgresの処理が止まる postgresのプロセスが大量
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