Transparent memory offloading: more memory at a fraction of the cost and power
Transparent memory offloading: more memory at a fraction of the cost and power Transparent memory offloading (TMO) is Meta’s data center solution for offering more memory at a fraction of the cost and power of existing technologies In production since 2021, TMO saves 20 percent to 32 percent of memory per server across millions of servers in our data center fleet We are witnessing massive growth i
Linux Kernel: PSI - Pressure Stall Information /proc/pressure/io 㧠IO å¾…ã¡ã‚’観察ã™ã‚‹ - hibomaã®æ—¥è¨˜
www.kernel.org Linux Kernel 4.20 ã§å°Žå…¥ã•ã‚ŒãŸ PSI - Pressure Stall Information ã® /proc/pressure/io ã«ã¤ã„ã¦æ°—ã«ãªã‚‹ã“ã¨ãŒã‚ã£ãŸã®ã§èª¿ã¹ã¦ã„ã¾ã—㟠イントãƒãƒ€ã‚¯ã‚·ãƒ§ãƒ³ PSI を使ã†ã¨ CPU, メモリ, IO 㧠stall ã—ãŸæ™‚é–“(割åˆ) を計測ã§ãã‚‹ã£ã¦ãªã“ã¨ã§ã™ãŒã€ã©ã†ã„ã£ãŸå®Ÿè£…ã§ã€ŒIO å¾…ã¡ã€ãªã‚¿ã‚¹ã‚¯ã‚’計測ã—ã¦ã„ã‚‹ã®ã‹ã‹ãŒç–‘å•ã§ã€ç¤¾å†…㧠udzula ã•ã‚“ã‚ã‚Œã“れ話をèžã„ã¦ã„ãŸã®ã§ã—㟠ソースをèªã‚€ io_schedule_prepare() ã¨ã„ã†é–¢æ•°ã‚’呼ã³å‡ºã™éš›ã« current->in_iowait = 1 をセットã—ã¦ã„ã¦ã€ã“ã‚ŒãŒãƒã‚¤ãƒ³ãƒˆ int io_schedule_prepare(void) { int old_iowait = current->in_iowait; curre
Linux Kernel: PSI - Pressure Stall Information /proc/pressure/memory 㧠メモリã®ã‚¹ãƒˆãƒ¼ãƒ«ã‚’観察ã™ã‚‹ - hibomaã®æ—¥è¨˜
下記ã®ç¶šãエントリã§ã™ hiboma.hatenadiary.jp 今回㯠PSI - Pressure Stall Information ã® /proc/pressure/memory ã«ã¤ã„ã¦ã®ã‚¨ãƒ³ãƒˆãƒª PSI を使ã†ã¨ CPU, メモリ, IO 㧠stall ã—ãŸæ™‚é–“(割åˆ) を計測ã§ãã‚‹ã£ã¦ãªã“ã¨ã§ã™ãŒã€ã©ã†ã„ã£ãŸå®Ÿè£…ã§ã€Œmemory stall = メモリã®ã‚¹ãƒˆãƒ¼ãƒ«ã€ã‚’èµ·ã“ã—ã¦ã„るタスクを計測ã—ã¦ã„ã‚‹ã®ã‹ã‹ãŒç–‘å•ã§èª¿ã¹ã¦ã„ã¾ã—㟠PSI ã®ãƒ‰ã‚ュメント www.kernel.org æ£ç›´ã€ãƒ‰ã‚ュメントをèªã‚“ã ã ã‘ã§ã¯ /proc/pressure/memory ãŒã©ã†ã„ã£ãŸã‚¿ã‚¤ãƒŸãƒ³ã‚°ã§è¨ˆä¸Šã•ã‚Œã‚‹ã®ã‹åˆ†ã‹ã‚Šã¾ã›ã‚“ã§ã—ãŸ. ソースをèªã‚€ www.kernel.org ./kernel/sched/psi.c ã‚’ã–ーã£ã¨å‘¼ã‚“ã§ã„ã£ã¦ psi_memstall_enter() 㨠p
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