jleahy

6 ms·

1.
by jleahy 1y ago
Yes hard links aren't supported in TernFS. They would actually be really difficult to make work in this kind of sharded metadata design as they would need to be reference counted and all the operations would need to go via the CDC. It
2.
by jleahy 1y ago
(disclaimer: CTO of XTX) It was a long long time ago that we were only using NFS, it ran on top of a Solaris machine running ZFS. It did its job at the very beginning, but you don't build up hundreds of petabytes of data on an NFS serv
3.
by jleahy 1y ago
(disclaimer: CTO of XTX) These limits aren't quite as strict as they first seem. Our median file size is 2MB, which means 50% of our files are <2MB. Realistically if you've got an exabyte of data with an average file size of a
4.
by jleahy 1y ago
> So no RDMA? We can saturate the network interfaces of our flash boxes with our very simple Go block server, because it uses sendfile under the hood. It would be easy to switch to RDMA (it’s just a transport layer change) but right now
5.
by jleahy 1y ago
2MB median to be fair, so half of our files are under 2MB.
6.
by jleahy 1y ago
Trading using ML.
7.
by jleahy 1y ago
could be a tectonic shift in the open source filesystem landscape?
8.
by jleahy 1y ago
The seamless realtime intercontinental replication is a key feature for us, maybe the most important single feature, and AFAIK you can’t do that with Ceph (even if Ceph could scale to our original 10 exabyte target in one instance).
9.
by jleahy 1y ago
It's just not optimised for tiny files. It absolutely would work with no problems at all, and you could definitely use it to store 100 billion 1kB files with zero problems (and that is 100 terabytes of data, probably on flash, so no jo
10.
Tenstorrent Wormhole Series: Taking apart T tiles(corsix.org)
2 points by jleahy 2y ago|0 comments
11.
by jleahy 3y ago
The point is that they need to be synchronised in order to respond to changes in load.
12.
by jleahy 3y ago
That’s not correct. The frequency provides an indication of how much power is being drawn. If the frequency is low then generators supply more power to bring it back to 60 Hz. If there was not a well known fixed frequency it would be imposs
13.
by jleahy 3y ago
ICE is the name of the derivatives exchange, which is in Chicago. The cash market is called NYSE. The parent post said ‘ICE AND NYSE’.
14.
by jleahy 3y ago
ICE is actually in Chicago.
15.
by jleahy 3y ago
In my experience a large % of the daily trade volume comes from me.
16.
by jleahy 3y ago
The spread between SPX and ES is purely mechanical. It’s a function of expected future interest rates and dividends over the remaining life of the future. There is no such thing as support/resistance in reality.
17.
by jleahy 3y ago
ES trumps the others.
18.
by jleahy 3y ago
The Topping MX3 is also pretty good in my opinion and about half the price. That’s probably next down on the pareto frontier.
19.
by jleahy 3y ago
At very least it looks like it can do what TLA can do whilst being dramatically less painful to learn / work with. That is very much enough to be interesting.
20.
by jleahy 3y ago
Even hitting RAM takes the best part of 100ns. They probably mean 5-10us given the ‘6x faster’ thing.
21.
by jleahy 3y ago
Well it says "Limited adoption so far; CXL expected to accelerate through 2022 and 2023" (which didn't happen), so presumably 2021.
22.
by jleahy 3y ago
Well it does work in hardware, but not with the normal shift instruction. Just use a ‘double shift’ which you can get with __int128 (or with inline asm, or just full asm).
23.
by jleahy 3y ago
Yes, it happens to people every day for all kinds of boring reasons. Normally because they made a mistake in their flight plan. Remember anyone flying IFR needs a flight plan, lots of private pilots etc. Plenty of people make mistakes.
24.
by jleahy 3y ago
Well they can reject the bad flight plan and the plane will not be allowed to follow it.
25.
by jleahy 3y ago
I used to have a Brother laser but now have a Kyocera color laser MFP, it works beautifully so that’s another good option. Also a networked printer is a lot less faff if you have a lot of Linux machines at home, from a drivers perspective.
26.
by jleahy 3y ago
The ‘how do I exit vim’ problem.
27.
by jleahy 3y ago
There are still jobs where you end up writing large amounts of asm regularly and this is absolutely table-stakes for that. Otherwise there would be no point using asm at all, you’d just use C or another high-level language. There was once a
28.
by jleahy 3y ago
ah, onlink, indeed that is another way.
29.
by jleahy 3y ago
It’s very nasty, but there are a lot of options. For example you can give the gateway an address in the link local range and add a route pointing at that. I think that’s the best way. Another option would be to set the subnet mask to /
30.
by jleahy 3y ago
Yes, and you can calculate exactly how much time it takes (it was an exam question in my final exams for undergrad iirc). The amount of time depends on the mass of the black hole but it's definitely less than a minute.

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