We had a discussion at work about MySQL doing Disk I/O to a NVME
disk, and if it is valid to turn off the doublewrite buffer when
So I have been playing this Internet Spaceships Game.
No, the other one.
It also has NPC Backstory, and on
a multiplanetary food crisis was predicted, as a prep for the introduction
of a new tradeable good on
The last time I saw a MySQL server operating at a performance limit
was in 2012. Back them we had a production master on (then) current
hardware, running stable at about 21000 QPS. At 24000 QPS it tended
to become unstable and fall over, dying in global locks on the
InnoDB Adaptive Hash Index or other global locks.
“Kris, guck mal, connection surge auf $WICHTIGER_MASTER, davor kurzer Activity drop. Alle anderen Graphen sehen normal aus.”
Ein Thread über Konsenssysteme aus
Saving an older twitter thread on Ceph.
While I was testing away on all the SSD and NVME toys, I got my hand on a test box with even stranger that usual equipment. It was a Dual Platinum-8280 box with a really weird amount of memory: 7.5 TB.
Adventures in Storageland
So a few days ago, somebody found an exploit in beep - now
Hashes and their uses
we have been talking about hash functions in general, and
cryptographic hashes in particular. We wanted four things from
A hash function is a function that maps a large number of arbitrary data
types onto a smaller number of contiguous integers.
Intel finally published a whitepaper about Spectre #2 Mitigation. The
is also featured on
Hacker News. It’s a technical
whitepaper, but you can see the footprints of lawyers all over the
language. For me, it basically says that, yes, Retpolines are indeed
incompatible with Controlflow Enforcement Technology (CET) that Intel
was planning for later CPUs
El Reg article).
Yesterday, Booking.com hosted the Open Compute Meetup in
Amsterdam. My talk is on Slideshare and a recording is on
There is a very useful and interesting article by Chris Down:
“In defence of swap: common misconceptions”.
What does your Mac do on Startup? Knockknock knows.
Melvin Conway is a compiler
developer and systems designer, who is well known for the eponymous
Conway’s Law. Various
phrasings exist of that, and one popular is