Planet Linux Australia
Zoe's Kindergarten has scored the fundraising sausage sizzle rights to the local Councillor's next Movies in the Park event. Since I've been the chairperson of the PAG, which doesn't seem to actually involve much other than being cheerleader in chief and chairing monthly meetings, I thought I'd lend the fundraising committee a hand with the organising of this event. The fundraising committee have worked their butts off this year.
After I dropped Zoe at Kindergarten, I want to the home of one of the committee members and met with the committee to discuss logistics for the upcoming sausage sizzle. I'd previously volunteered to try and get a donation of sausages from a local butcher, but hadn't had a chance to do that yet.
After taking a bus into the city and back for a lunch meeting, and picking up Zoe from Kindergarten afterwards, we set out on a tour of all the local supermarkets and butchers, with an official letter in hand from the Kindergarten.
We were unlucky on all fronts, but Zoe did score a free cheerio at one butcher, so she was pretty happy. Driving all over the place ate up most of the afternoon.
Anshu dropped in after work not long after we got home, and then Sarah arrived not long after that to pick up Zoe.
As regular readers would know, I make some effort to avoid using closed-source and proprietary software. This includes that popular operating system common on laptops and servers, MS-Windows. However there are a small number of reasons why this O.S. is required, including life-saving medical equipment hardware which, for some unfathomable reason, has been written to only interface with proprietary operating systems. Open source developers?
There seems be a bit of an exodus from the MariaDB Foundation board recently… I’m not sure exactly what to make of it all, but the current members according to https://mariadb.org/en/foundation/ are:
- Rasmus Johansson (chair)
- Michael “Monty” Widenius
- Jeremy Zawodny
- Sergei Golubchik
With Jeremy Zawodny being the only non-MariaDB Corp member.
Recently, Jeremy Cole asked some people about their membership:
@jeremycole Nope. Resigned months ago.
— Mike Milinkovich (@mmilinkov) October 2, 2014
@jeremycole Hi Jeremy, no, sorry, I resigned a little while back.
— Andrew Katz (@andrewjskatz) October 1, 2014
@jeremycole yes, though I'm having some doubts about its future (for a variety of reasons) :-(
— Jeremy Zawodny (@jzawodn) October 1, 2014
I’m a little worried for the project, the idea of a foundation around it and for people I count as friends who work on MariaDB.
Good news everyone!
MySQL 5.7.5 is out with a bunch more patches for running well on POWER in the tree. I haven’t yet gone and tried it all out, but since I’m me, I look at bugs database and git/bzr history first.
On Intel CPUs, when you’re spinning on a spin lock, you’re meant to execute the PAUSE CPU instruction. This tells the CPU that other execution threads in the same core should be given priority as you are currently not doing anything productive. Without this, you’re likely going to hurt on hyperthreaded CPUs.
In MySQL, there are custom spinlocks in order to do interesting adaptive mutex things to attempt to squeeze the most performance possible out of modern systems.
One of the (not 100% ready, but close) bugs with patches I submitted against MySQL 5.7 was for using the equivalent of the PAUSE instruction for POWER CPUs. On POWER, we’re a bit different, you can actually set priorities of threads (which may matter more, as POWER8 CPUs can be in SMT8 mode – where there are *eight* executing threads per core).
So, the good news is that in MySQL 5.7.5, the magic instructions for setting thread priority are in! This should mean great things for performance on POWER systems with any of the SMT modes enabled.
The next interesting part of this is how it interacts with other KVM guests on a system. At least on POWER (and on x86 as well, although I won’t go into details here) there’s a hypervisor call that a guest can make saying “hey, I’m spinning here, perhaps you want to make sure other vcpus execute so that at some point I can continue”. On POWER, this is the H_CONFER hcall, where you can basically do a directed yield to another vcpu (the one that holds the lock you’re trying to get is a good idea).
Generally though, it’s only the guest kernel that does this, not userspace. You can see the H_CONFER call in __spin_yield(arch_spinlock_t*) and __rw_yield(arch_rwlock_t*) in arch/powerpc/lib/locks.c in the kernel.
It would be interesting to see what extra we could get out of a system running multiple guests with MySQL servers if InnoDB/MySQL could properly yield to the right vcpu (well, thread I guess).
- Add instance administrative lock status to the instance detail results: review 127139.
- Add more detailed network information to the metadata server: review 85673.
- Add separated policy rule for each v2.1 api: review 127863.
- Add user limits to the limits API (as well as project limits): review 127094.
- Allow all printable characters in resource names: review 126696.
- Implement instance tagging: review 127281.
- Implement tags for volumes and snapshots with the EC2 API: review 126553 (spec approved).
- Implement the v2.1 API: review 126452 (spec approved).
- Microversion support: review 127127.
- Move policy validation to just the API layer: review 127160.
- Support X509 keypairs: review 105034.
- Enable the nova metadata cache to be a shared resource to improve the hit rate: review 126705.
- Initial specification: review 114044.
- Implement support for FreeBSD networking in nova-network: review 127827.
- Allow volumes to be stored on SMB shares instead of just iSCSI: review 102190.
- Add ephemeral disk support to the VMware driver: review 126527 (spec approved).
- Add support for the HTML5 console: review 127283.
- Allow Nova to access a VMWare image store over NFS: review 126866.
- Enable administrators and tenants to take advantage of backend storage policies: review 126547 (spec approved).
- Support the OVA image format: review 127054.
- Add a new linuxbridge VIF type, macvtap: review 117465.
- Add support for SMBFS as a image storage backend: review 103203.
- Convert to using built in libvirt disk copy mechanisms for cold migrations on non-shared storage: review 126979.
- Support libvirt storage pools: review 126978.
- Support quiesce filesystems during snapshot: review 126966.
- Allow direct access to LVM volumes if supported by Cinder: review 127318.
- Move flavor data out of the system_metdata table in the SQL database: review 126620.
- Enable lazy translations of strings: review 126717.
- Add an IOPS weigher: review 127123 (spec approved).
- Allow limiting the flavors that can be scheduled on certain host aggregates: review 122530.
- Create an object model to represent a request to boot an instance: review 127610.
- Decouple services and compute nodes in the SQL database: review 126895.
- Implement resource objects in the resource tracker: review 127609.
- Move select_destinations() to using a request object: review 127612.
- Add instance count on the hypervisor as a weight: review 127871.
- Provide a reference implementation for console proxies that uses TLS: review 126958.
- Strongly validate the tenant and user for quota consuming requests with keystone: review 92507.
Tags for this post: openstack kilo blueprints spec
Related posts: Compute Kilo specs are open; Specs for Kilo; Blueprints to land in Nova during Juno; On layers; My candidacy for Kilo Compute PTL; Juno nova mid-cycle meetup summary: nova-network to Neutron migration
RMIT Building 91, 110 Victoria Street, Carlton SouthLink: http://luv.asn.au/meetings/map
Wen Lin will be introducing newcomers to Linux to the use of the "command line".
Wen Lin is the long-serving treasurer for Linux Users of Victoria and has provided several presentations in the past on Libre/OpenOffice.
Linux Users of Victoria Inc., is an incorporated association, registration number A0040056C.October 18, 2014 - 12:30
After a week I'm seeing something interesting. In Juno the specs process was new, and we saw a pause in the development cycle while people actually wrote down their designs before sending the code. This time around people know what to expect, and there are left over specs from Juno lying around. We're therefore seeing specs approved much faster than in Kilo. This should reduce the effect of the "pipeline flush" that we saw in Juno.
So far we have five approved specs after only a week.
Tags for this post: openstack kilo blueprints spec
Related posts: One week of Nova Kilo specifications; Specs for Kilo; Blueprints to land in Nova during Juno; On layers; My candidacy for Kilo Compute PTL; Juno nova mid-cycle meetup summary: nova-network to Neutron migration
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The problem with being too busy to blog on the day, is by the time I get around to it, I've forgotten half the details...
I can't remember what we did in the morning before TumbleTastics. I think Sarah dropped Zoe around a bit late because she wasn't going to work.
We popped down to the post office to collect some mail, and then the supermarket. After that, Zoe was a bit tired and grumpy (apparently she'd woken up early) and didn't really want to go to TumbleTastics, but after some morning tea, perked up and reconsidered.
We scootered to TumbleTastics, and discovered that one of the boys from Kindergarten, Lachlan, is in her class. She had another really good class, and I invited Lachie and his Mum and little sister over for lunch afterwards.
Lachie and Zoe had a great time playing together, before and after lunch. I think that was the extend of what happened on Friday that was memorable.
Good news everyone! Tyan has announced the availability of their first OpenPOWER system! They call this a Customer Reference System, which means it’s an excellent machine to start poking at OpenPower and POWER8 (or deploying applications on).
Because it’s an OpenPower machine, it runs the open source Open Power firmware (all up on github) and will happily run Linux (feel free to port your other operating system kernels). I’ll be writing more on the OpenPower firmware soon as, well, technical details are fun!
Ubuntu 14.10 is listed as recommended as not only have they been building for POWER8 but have spent some time ensuring things work fairly well out-of-the-box (both as a KVM guest and running native on the bare metal). Or, you can always just boot whatever the mainline kernel is at – build for the POWERNV (POWER non-virtualized) platform (be sure to include all the required drivers) and have fun!
Just to remind myself.. add systemd.unit=emergency.target to the kernel line, or if that fails, try init=/sbin/sh and remove both quiet and rhgb options.
Afterwards, exit or:
Can also enable debug mode to help investigating problems with systemd.log_level=debug
You can get a console early on in the boot process by enabling debug-shell:
systemctl enable debug-shell.service