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Skip to content Featured What is Gang Scan? Gang Scan is an open source (and free) attendance tracking system based on custom RFID reader boards that communicate back to a server over wifi. The boards are capable of queueing scan events in the case of intermittent network connectivity, and the server provides simple reporting. Author mikal Posted on June 5, 2019 Categories Gang Scan Leave a comment on What is Gang Scan? Shaken Fist 0.2.0 The other day we released Shaken Fist version 0.2, and I never got around to announcing it here. In fact, we’ve done a minor release since then and have another minor release in the wings ready to go out in the next day or so. So what’s changed in Shaken Fist between version 0.1 and 0.2? Well, actually kind of a lot… We moved from MySQL to etcd for storage of persistant state. This was partially done because we wanted distributed locking, but it was also because MySQL was a pain to work with. We rearranged our repositories — the main repository is now in its own github organisation, and the golang REST client, terrform provider, and deployment tooling have moved into their own repositories in that organisation. There is also a prototype javascript client now as well. Some work has gone into making the API service more production grade, although there is still some work to be done there probably in the 0.3 release — specifically there is a timeout if a response takes more than 300 seconds, which can be the case in launch large VMs where the disk images are not in cache. There were also some important features added: Authentication of API requests. Resource ownership. Namespaces (a bit like Kubernetes namespaces or OpenStack projects). Resource tagging, called metadata. Support for local mirroring of common disk images. …and a large number of bug fixes. Shaken Fist is also now packaged on pypi, and the deployment tooling knows how to install from packages as well as source if that’s a thing you’re interested in. You can read more at shakenfist.com , but that site is a bit of a work in progress at the moment. The new github organisation is at github.com/shakenfist . Author mikal Posted on July 19, 2020 Categories Shaken Fist Tags shakenfist Leave a comment on Shaken Fist 0.2.0 The KSM and I I spent much of yesterday playing with KSM (Kernel Shared Memory, or Kernel Samepage Merging depending on which universe you come from). Unix kernels store memory in “pages” which are moved in and out of memory as a single block. On most Linux architectures pages are 4,096 bytes long. KSM is a Linux Kernel feature which scans memory looking for identical pages, and then de-duplicating them. So instead of having two pages, we just have one and have two processes point at that same page. This has obvious advantages if you’re storing lots of repeating data. Why would you be doing such a thing? Well the traditional answer is virtual machines. Take my employer’s systems for example. We manage virtual learning environments for students, where every student gets a set of virtual machines to do their learning thing on. So, if we have 50 students in a class, we have 50 sets of the same virtual machine. That’s a lot of duplicated memory. The promise of KSM is that instead of storing the same thing 50 times, we can store it once and therefore fit more virtual machines onto a single physical machine. For my experiments I used libvirt / KVM on Ubuntu 18.04. To ensure KSM was turned on, I needed to: Ensure KSM is turned on. /sys/kernel/mm/ksm/run should contain a “1” if it is enabled. If it is not, just write “1” to that file to enable it. Ensure libvirt is enabling KSM. The KSM value in /etc/defaults/qemu-kvm should be set to “AUTO”. Check KSM metrics: # grep . /sys/kernel/mm/ksm/* /sys/kernel/mm/ksm/full_scans:891 /sys/kernel/mm/ksm/max_page_sharing:256 /sys/kernel/mm/ksm/merge_across_nodes:1 /sys/kernel/mm/ksm/pages_shared:0 /sys/kernel/mm/ksm/pages_sharing:0 /sys/kernel/mm/ksm/pages_to_scan:100 /sys/kernel/mm/ksm/pages_unshared:0 /sys/kernel/mm/ksm/pages_volatile:0 /sys/kernel/mm/ksm/run:1 /sys/kernel/mm/ksm/sleep_millisecs:200 /sys/kernel/mm/ksm/stable_node_chains:49 /sys/kernel/mm/ksm/stable_node_chains_prune_millisecs:2000 /sys/kernel/mm/ksm/stable_node_dups:1055 /sys/kernel/mm/ksm/use_zero_pages:0 My lab machines are currently setup with Shaken Fist , so I just quickly launched a few hundred identical VMs. This first graph is that experiment. Its a little hard to see here but on three machines I consumed about about 40gb of RAM with indentical VMs and then waited. After three or so hours I had saved about 2,500 pages of memory. To be honest, that’s a pretty disappointing result. 2,5000 4kb pages is only about 10mb of RAM, which isn’t very much at all. Also, three hours is a really long time for our workload, where students often fire up their labs for a couple of hours at a time before shutting them down again. If this was as good as KSM gets, it wasn’t for us. After some pondering, I realised that KSM is configured by default to not work very well. The default value for pages_to_scan is 100, which means each scan run only inspects about half a megabyte of RAM. It would take a very very long time to scan a modern machine that way. So I tried setting pages_to_scan to 1,000,000,000 instead. One billion is an unreasonably large number for the real world, but hey. You update this number by writing a new value to /sys/kernel/mm/ksm/pages_to_scan. This time we get a much better result — I launched as many VMs as would fit on each machine, and the sat back and waited (well, went to bed acutally). Again the graph is a bit hard to read, but what it is saying is that after 90 minutes KSM had saved me over 300gb of RAM across the three machines. Its still a little too slow for our workload, but for workloads where the VMs are relatively static that’s a real saving. Now it should be noted that setting pages_to_scan to 1,000,000,000 comes at a cost — each of these machines now has one of its 48 cores dedicated to scanning memory and deduplicating. For my workload that’s something I am ok with because my workload is not CPU bound, but it might not work for you. Author mikal Posted on July 19, 2020 Categories Linux Tags ksm , kvm , libvirt , linux , shakenfist Leave a comment on The KSM and I Introducing Shaken Fist The first public commit to what would become OpenStack Nova was made ten years ago today — at Thu May 27 23:05:26 2010 PDT to be exact. So first off, happy tenth birthday to Nova! A lot has happened in that time — OpenStack has gone from being two separate Open Source projects to a whole ecosystem, developers have come and gone (and passed away), and OpenStack has weathered the cloud wars of the last decade. OpenStack survived its early growth phase by deliberately offering a “big tent” to the community and associated vendors, with an expansive definition of what should be included. This has resulted in most developers being associated with a corporate sponser, and hence the decrease in the number of developers today as corporate interest wanes — OpenStack has never been great at attracting or retaining hobbist contributors. My personal involvement with OpenStack started in November 2011, so while I missed the very early days I was around for a lot and made many of the mistakes that I now see in OpenStack. What do I see as mistakes in OpenStack in hindsight? Well, embracing vendors who later lose interest has been painful, and has increased the complexity of the code base significantly. Nova itself is now nearly 400,000 lines of code, and that’s after splitting off many of the original features of Nova such as block storage and networking. Additionally, a lot of our initial assumptions are no longer true — for example in many cases we had to write code to implement things, where there are now good libraries available from third parties. That’s not to say that OpenStack is without value — I am a daily user of OpenStack to this day, and use a...
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