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Ask Noah Show 509

Ask Noah Show 509

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Summary
 This week Steve gives us a deep dive into performance tuning, and we talk about how your body's memory functions. -- During The Show -- 00:50 Intro Subsisting greeting variablesAccessible memoryStrength of memoryReading and writing builds "Accessible memory"Teaching builds "Strength of memory"Go look up "space repetition"Reader come home bookYouTube if you check their sources 17:55 News Wire OpenSSL Security Update - github.comGit 2.56 - github.blogThunderbird 157 - thunderbird.netFirefox 157 firefox.com - firefox.comShotcut 26.9 - phoronix.comTails 7.14 - torproject.orgParrot OS 7.4 - parrotsec.orgOpenMandriva ROME 26.09 - openmandriva.orgNitrux 7.0 - opensourcefeed.orgAntix 26.1 - antixlinux.comSMTP Backdoors - infosecurity-magazine.comCOSMIC Desktop No Longer Accepts AI Content - reddit.comBeam AI - fortune.comGoogle Halts Open Source Bug Bounty Program - bleepingcomputer.com 19:15 Performance Tuning Defaults are someone guessing at a "safe option"Three hosts being tuned NAS (file server)vHost (virtual disks live here)Container HostWhen should you performance tune? BroadcastingNetworks (ISPs)The more "dense" the more benefitsTuneDZFS "Adaptive Replacement Cache" (ARC) Default is 50% of RAMSwap file System doesn't empty on its ownARC stats Hits and missesResets on rebootMemory pressureSwapyness 60 is the defaultthe "cliff rate"Tuned to around 10%-30% on "performance profiles"System starts swapping before you hit zero RAMZFS record size Record size is the "Maximum" not "Fixed size"Media Library 1MPostgres 16KZFS write amplification (8k writes to 1M records hurt)AI study bot rulesMan systemd.directivesWrite in and tell us if you want more! Extra Credit: What to search after the show ZFS ARC TuningZFS Record Size ZFS send receive preserves record sizeRecord size is per "data set" not directoryRecord size only affects new writes"zfs_dirty_data_max" vs "vm.dirty_ratio""QEMU "cache=none" O_DIRECT"Postgres on NFS PGDATA caveats"Tuned-adm virtual-host" hypervisor profile (The one nobody mentions)Tuned profile format "sysctl" vs "main" the plugin/argument splitNFS mount options (the client side fix)"vmstat" reading swap columns correctly -- The Extra Credit Section -- For links to the articles and material referenced in this week's episode check out this week's page from our podcast dashboard! This Episode's Podcast Dashboard Phone Systems for Ask Noah provided by Voxtelesys Join us in our dedicated chatroom #GeekLab:linuxdelta.com on Matrix -- Stay In Touch -- Find all the resources for this show on the Ask Noah Dashboard Ask Noah Dashboard Need more help than a radio show can offer? Altispeed provides commercial IT services and they’re excited to offer you a great deal for listening to the Ask Noah Show. Call today and ask about the discount for listeners of the Ask Noah Show! Altispeed Technologies Contact Noah live [at] asknoahshow.com -- Twitter -- Noah - KernellinuxAsk Noah ShowAltispeed Technologies
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